/* roulang page: index */
:root {
  --bg-dark: #0F0620;
  --bg-light: #F7F8FB;
  --surface-dark: #1B1031;
  --surface-light: #FFFFFF;
  --primary: #8B5CF6;
  --primary-light: rgba(139, 92, 246, 0.15);
  --accent: #22D3EE;
  --cta: #FF7A45;
  --cta-light: #FF9F68;
  --success: #34D399;
  --star: #FBBF24;
  --text-dark-bg: #F1F0F7;
  --text-dark-sub: #B5A8D9;
  --text-light: #1C1830;
  --text-light-sub: #6B7280;
  --border-dark: rgba(255, 255, 255, 0.08);
  --border-light: #E5E7EB;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.25);
  --transition: all 0.2s ease;
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg-light);
  color: var(--text-light);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  max-width: 100%;
  display: block;
}
button,
input {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  cursor: pointer;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.section {
  padding: 96px 0;
}
.section-dark {
  background: var(--bg-dark);
  color: var(--text-dark-bg);
}
.section-light {
  background: var(--bg-light);
}
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header .tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-light);
}
.section-dark .section-header h2 {
  color: var(--text-dark-bg);
}
.section-header p {
  color: var(--text-light-sub);
  max-width: 680px;
  margin: 12px auto 0;
  font-size: 1rem;
}
.section-dark .section-header p {
  color: var(--text-dark-sub);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 14px 28px;
  border-radius: 10px;
  transition: var(--transition);
  border: none;
  line-height: 1.2;
}
.btn:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: rgba(139, 92, 246, 0.85);
  box-shadow: 0 8px 24px rgba(139, 92, 246, 0.35);
  transform: translateY(-2px);
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.2);
}
.btn-ghost {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}
.btn-ghost:hover {
  background: rgba(34, 211, 238, 0.1);
  transform: translateY(-2px);
}
.btn-ghost:active {
  transform: translateY(0);
}
.btn-cta {
  background: linear-gradient(135deg, #FF7A45, #FF9F68);
  color: #fff;
}
.btn-cta:hover {
  filter: brightness(1.1);
  box-shadow: 0 8px 24px rgba(255, 122, 69, 0.35);
  transform: translateY(-2px);
}
.btn-cta:active {
  transform: translateY(0);
  filter: brightness(0.95);
}
.btn-lg {
  padding: 16px 36px;
  font-size: 1.0625rem;
  border-radius: 14px;
}

/* ===== Header / Nav ===== */
.site-header {
  background: transparent;
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 16px 0;
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(15, 6, 32, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-dark);
}
.nav-panel {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface-dark);
  border: 1px solid var(--border-dark);
  border-radius: 18px;
  padding: 8px 12px;
  box-shadow: var(--shadow-dark);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  padding: 4px 8px;
}
.logo-badge {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  letter-spacing: -1px;
}
.logo-name {
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--text-dark-bg);
  letter-spacing: 0.5px;
  white-space: nowrap;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  flex: 1;
  justify-content: center;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid transparent;
  color: var(--text-dark-sub);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}
.nav-item i {
  font-size: 0.9375rem;
  color: var(--text-dark-sub);
  transition: var(--transition);
}
.nav-item:hover {
  background: rgba(139, 92, 246, 0.2);
  color: var(--text-dark-bg);
}
.nav-item:hover i {
  color: var(--accent);
}
.nav-item.active {
  background: rgba(139, 92, 246, 0.2);
  border-color: var(--primary);
  color: var(--text-dark-bg);
}
.nav-item.active i {
  color: var(--primary);
}
.nav-cta {
  flex-shrink: 0;
  padding: 12px 20px;
  font-size: 0.9375rem;
  border-radius: 10px;
}
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-dark-bg);
  font-size: 1.25rem;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.nav-toggle:hover {
  background: rgba(139, 92, 246, 0.25);
}

/* ===== Hero ===== */
.hero {
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
  color: var(--text-dark-bg);
  padding: 48px 0 96px;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(139, 92, 246, 0.08) 1px, transparent 1px), linear-gradient(90deg, rgba(139, 92, 246, 0.08) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.3), rgba(34, 211, 238, 0.1));
  pointer-events: none;
}
.hero .container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
  min-height: 620px;
}
.hero-content {
  padding-right: 20px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-light);
  border: 1px solid rgba(139, 92, 246, 0.3);
  color: #b79efc;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 24px;
}
.hero-badge i {
  color: var(--success);
}
.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero h1 .highlight {
  color: var(--accent);
}
.hero-sub {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--text-dark-sub);
  line-height: 1.8;
  max-width: 540px;
  margin-bottom: 36px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-visual {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-dark);
  background: var(--surface-dark);
  aspect-ratio: 4 / 5;
}
.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(15, 6, 32, 0.5));
  pointer-events: none;
}
.hero-float-card {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 16px;
  background: rgba(27, 16, 49, 0.92);
  border: 1px solid var(--border-dark);
  border-radius: 14px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  backdrop-filter: blur(8px);
  z-index: 2;
}
.hero-float-card .float-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(34, 211, 238, 0.15);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  flex-shrink: 0;
}
.hero-float-card .float-text {
  flex: 1;
}
.hero-float-card .float-text strong {
  display: block;
  font-size: 0.9375rem;
  color: var(--text-dark-bg);
  font-weight: 600;
}
.hero-float-card .float-text span {
  font-size: 0.8125rem;
  color: var(--text-dark-sub);
}
.hero-float-card .float-status {
  color: var(--success);
  font-size: 0.8125rem;
  font-weight: 600;
  flex-shrink: 0;
}

/* ===== Features ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card:nth-child(1) .feature-icon {
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 14px;
}
.feature-card:nth-child(2) .feature-icon {
  background: rgba(34, 211, 238, 0.1);
  color: #0ea5c4;
  border-radius: 50%;
}
.feature-card:nth-child(3) .feature-icon {
  background: rgba(255, 122, 69, 0.1);
  color: var(--cta);
  border-radius: 14px 4px 14px 4px;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(139, 92, 246, 0.12);
}
.feature-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 24px;
}
.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-light);
}
.feature-card p {
  color: var(--text-light-sub);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ===== Screenshots ===== */
.screenshots {
  background: var(--bg-dark);
  color: var(--text-dark-bg);
  padding: 96px 0;
  overflow: hidden;
}
.screenshot-track {
  display: flex;
  gap: 24px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 8px 4px 24px;
  scrollbar-width: thin;
  scrollbar-color: var(--primary) rgba(255, 255, 255, 0.1);
}
.screenshot-track::-webkit-scrollbar {
  height: 8px;
}
.screenshot-track::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 8px;
}
.screenshot-track::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.06);
  border-radius: 8px;
}
.screenshot-card {
  min-width: 320px;
  flex: 0 0 320px;
  scroll-snap-align: center;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface-dark);
  border: 1px solid var(--border-dark);
  transition: var(--transition);
}
.screenshot-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(139, 92, 246, 0.2);
}
.screenshot-media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  position: relative;
}
.screenshot-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.screenshot-card:hover .screenshot-media img {
  transform: scale(1.04);
}
.screenshot-caption {
  padding: 16px 20px;
  font-size: 0.9375rem;
  color: var(--text-dark-sub);
  line-height: 1.6;
}
.screenshot-caption strong {
  display: block;
  color: var(--text-dark-bg);
  font-size: 1rem;
  margin-bottom: 4px;
  font-weight: 600;
}
.scroll-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}
.scroll-dots .dot {
  width: 8px;
  height: 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.2);
  transition: var(--transition);
}
.scroll-dots .dot.active {
  width: 24px;
  background: var(--accent);
}

/* ===== Requirements ===== */
.requirements-wrap {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 48px;
  align-items: center;
}
.requirements-intro h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text-light);
}
.requirements-intro p {
  color: var(--text-light-sub);
  font-size: 1rem;
  line-height: 1.75;
}
.requirements-list {
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.req-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}
.req-item:last-child {
  border-bottom: none;
}
.req-item:hover {
  background: rgba(139, 92, 246, 0.04);
}
.req-platform {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 140px;
}
.req-platform i {
  font-size: 1.375rem;
  color: var(--primary);
}
.req-platform span {
  font-weight: 600;
  font-size: 0.9375rem;
}
.req-spec {
  flex: 1;
  color: var(--text-light-sub);
  font-size: 0.875rem;
  line-height: 1.6;
  text-align: right;
}

/* ===== Testimonials ===== */
.testimonials {
  background: var(--bg-dark);
  color: var(--text-dark-bg);
  padding: 96px 0;
}
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}
.testimonial-card {
  background: var(--surface-dark);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.testimonial-card:nth-child(2) {
  transform: scale(1.02);
  border-color: rgba(139, 92, 246, 0.3);
  box-shadow: 0 12px 32px rgba(139, 92, 246, 0.1);
}
.testimonial-card:hover {
  transform: translateY(-4px) scale(1.02);
  border-color: rgba(139, 92, 246, 0.4);
}
.stars {
  color: var(--star);
  font-size: 0.875rem;
  letter-spacing: 4px;
}
.stars i {
  margin-right: 2px;
}
.testimonial-text {
  color: var(--text-dark-sub);
  font-size: 0.9375rem;
  line-height: 1.75;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}
.testimonial-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--primary-light);
  color: #b79efc;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 700;
  flex-shrink: 0;
}
.testimonial-author-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-dark-bg);
}
.testimonial-author-date {
  font-size: 0.8125rem;
  color: var(--text-dark-sub);
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  border-bottom: 1px solid var(--border-light);
  padding: 20px 0;
}
.faq-item:first-child {
  padding-top: 0;
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  text-align: left;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-light);
  padding: 4px 0;
  cursor: pointer;
  transition: var(--transition);
}
.faq-question:hover {
  color: var(--primary);
}
.faq-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  transition: transform 0.3s ease;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: var(--primary);
  color: #fff;
}
.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
}
.faq-item.active .faq-answer {
  grid-template-rows: 1fr;
}
.faq-answer-inner {
  overflow: hidden;
}
.faq-answer p {
  padding: 12px 0 0;
  color: var(--text-light-sub);
  font-size: 0.9375rem;
  line-height: 1.7;
  max-width: 680px;
}

/* ===== Download CTA ===== */
.download-cta {
  background: var(--bg-dark);
  color: var(--text-dark-bg);
  padding: 96px 0;
  position: relative;
  overflow: hidden;
}
.download-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(139, 92, 246, 0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(139, 92, 246, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}
.download-cta .container {
  position: relative;
  z-index: 2;
  text-align: center;
}
.download-cta h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 16px;
}
.download-cta p {
  color: var(--text-dark-sub);
  font-size: 1rem;
  max-width: 560px;
  margin: 0 auto 40px;
}
.download-main-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: linear-gradient(135deg, #FF7A45, #FF9F68);
  color: #fff;
  font-size: 1.125rem;
  font-weight: 700;
  padding: 18px 48px;
  border-radius: 14px;
  height: 56px;
  box-shadow: 0 8px 32px rgba(255, 122, 69, 0.25);
  transition: var(--transition);
}
.download-main-btn:hover {
  filter: brightness(1.08);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(255, 122, 69, 0.4);
}
.download-main-btn i {
  font-size: 1.125rem;
}
.download-sub-btns {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
}
.download-sub-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 10px;
  border: 1px solid var(--border-dark);
  color: var(--text-dark-sub);
  font-size: 0.9375rem;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.04);
  transition: var(--transition);
}
.download-sub-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(34, 211, 238, 0.08);
}
.download-meta {
  margin-top: 28px;
  color: var(--text-dark-sub);
  font-size: 0.875rem;
  opacity: 0.7;
}
.download-meta span {
  margin: 0 8px;
}

/* ===== News ===== */
.news-section {
  background: var(--bg-light);
  padding: 96px 0;
}
.news-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
}
.news-header h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  color: var(--text-light);
  position: relative;
  padding-left: 16px;
}
.news-header h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 28px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--primary), var(--accent));
}
.news-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9375rem;
  transition: var(--transition);
}
.news-more:hover {
  color: var(--accent);
}
.news-more span {
  transition: transform 0.2s ease;
}
.news-more:hover span {
  transform: translateX(4px);
}
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.news-card {
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.news-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(139, 92, 246, 0.1);
  border-color: rgba(139, 92, 246, 0.2);
}
.news-link {
  display: flex;
  gap: 16px;
  padding: 16px;
  align-items: flex-start;
}
.news-thumb {
  width: 120px;
  height: 80px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--surface-dark);
}
.news-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.news-card:hover .news-thumb img {
  transform: scale(1.06);
}
.news-body {
  flex: 1;
  min-width: 0;
}
.news-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-xs);
  margin-bottom: 8px;
}
.news-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 6px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-excerpt {
  font-size: 0.875rem;
  color: var(--text-light-sub);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 8px;
}
.news-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.news-footer time {
  font-size: 0.8125rem;
  color: var(--text-light-sub);
}
.news-footer .news-more-link {
  font-size: 0.8125rem;
  color: var(--primary);
  font-weight: 600;
  transition: var(--transition);
}
.news-footer .news-more-link:hover {
  color: var(--accent);
}
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 48px 24px;
  background: var(--surface-light);
  border: 1px dashed var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-light-sub);
  font-size: 1rem;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-dark);
  color: var(--text-dark-bg);
  padding: 64px 0 24px;
  border-top: 1px solid var(--border-dark);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-brand .logo-badge {
  margin-bottom: 16px;
}
.footer-brand .logo-name {
  font-size: 1.25rem;
  margin-left: 8px;
}
.footer-brand p {
  color: var(--text-dark-sub);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-top: 16px;
  max-width: 320px;
}
.footer-title {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-dark-bg);
}
.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-links a {
  color: var(--text-dark-sub);
  font-size: 0.9375rem;
  transition: var(--transition);
}
.footer-links a:hover {
  color: var(--accent);
}
.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.footer-contact p {
  color: var(--text-dark-sub);
  font-size: 0.9375rem;
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer-contact p i {
  color: var(--primary);
  width: 18px;
  text-align: center;
}
.footer-copyright {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border-dark);
  color: var(--text-dark-sub);
  font-size: 0.875rem;
}

/* ===== Responsive ===== */
@media (max-width: 1023px) {
  .section {
    padding: 64px 0;
  }
  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
    min-height: auto;
    padding-top: 32px;
  }
  .hero-content {
    padding-right: 0;
  }
  .hero-visual {
    max-width: 480px;
    margin: 0 auto;
    width: 100%;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .requirements-wrap {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .testimonial-grid {
    grid-template-columns: 1fr;
  }
  .testimonial-card:nth-child(2) {
    transform: none;
  }
  .testimonial-card:hover {
    transform: translateY(-4px);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .nav-item {
    padding: 10px 12px;
    gap: 6px;
  }
  .nav-item .nav-label {
    display: none;
  }
  .nav-item i {
    font-size: 1.125rem;
  }
}
@media (max-width: 767px) {
  .section {
    padding: 48px 0;
  }
  .nav-panel {
    flex-wrap: wrap;
  }
  .nav-toggle {
    display: flex;
    margin-left: auto;
  }
  .nav-menu {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    margin-left: 0;
    gap: 8px;
    padding-top: 8px;
  }
  .nav-menu.open {
    display: flex;
  }
  .nav-item {
    display: flex;
    padding: 14px 16px;
    justify-content: flex-start;
    gap: 12px;
  }
  .nav-item .nav-label {
    display: inline;
    font-size: 0.9375rem;
  }
  .nav-cta {
    display: none;
  }
  .nav-menu.open .nav-cta-mobile {
    display: block;
    text-align: center;
  }
  .hero h1 {
    font-size: clamp(2rem, 6vw, 2.75rem);
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .screenshot-card {
    min-width: 280px;
    flex-basis: 280px;
  }
  .requirements-list {
    border-radius: var(--radius-md);
  }
  .req-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 16px 20px;
  }
  .req-spec {
    text-align: left;
    font-size: 0.875rem;
  }
  .news-grid {
    grid-template-columns: 1fr;
  }
  .news-link {
    flex-direction: row;
  }
  .news-thumb {
    width: 100px;
    height: 76px;
  }
  .download-main-btn {
    width: 100%;
    height: auto;
    padding: 16px 32px;
  }
  .download-sub-btns {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .download-sub-btn {
    justify-content: center;
  }
  .download-meta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .section-header {
    margin-bottom: 32px;
  }
  .news-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 24px;
  }
}

/* roulang page: category1 */
:root {
  --bg-dark: #0F0620;
  --bg-light: #F7F8FB;
  --surface-dark: #1B1031;
  --surface-light: #FFFFFF;
  --primary: #8B5CF6;
  --accent: #22D3EE;
  --cta: #FF7A45;
  --success: #34D399;
  --star: #FBBF24;
  --text-dark-bg: #F1F0F7;
  --text-dark-sub: #B5A8D9;
  --text-light: #1C1830;
  --text-light-sub: #6B7280;
  --border-dark: rgba(255,255,255,0.08);
  --border-light: #E5E7EB;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow-light: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-dark: 0 8px 32px rgba(0,0,0,0.25);
  --shadow-primary: 0 8px 28px rgba(139,92,246,0.18);
  --transition: all 0.2s ease;
  --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-family); background: var(--bg-light); color: var(--text-light); line-height: 1.75; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; transition: color 0.2s ease; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-weight: 600; font-size: 15px; border: none; border-radius: var(--radius-sm); padding: 14px 28px; transition: var(--transition); line-height: 1.4; }
.btn:focus-visible { outline: 3px solid rgba(34,211,238,0.5); outline-offset: 3px; }
.btn-cta { background: linear-gradient(135deg, #FF7A45, #FF9F68); color: #fff; box-shadow: 0 6px 20px rgba(255,122,69,0.35); }
.btn-cta:hover { filter: brightness(1.08); box-shadow: 0 8px 26px rgba(255,122,69,0.45); transform: translateY(-2px); }
.btn-cta:active { filter: brightness(0.95); transform: translateY(0); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 20px rgba(139,92,246,0.3); }
.btn-primary:hover { background: #7A4AE0; box-shadow: 0 8px 26px rgba(139,92,246,0.4); transform: translateY(-2px); }
.btn-primary:active { transform: translateY(0); }
.btn-ghost { background: transparent; border: 1px solid var(--accent); color: var(--accent); }
.btn-ghost:hover { background: rgba(34,211,238,0.1); transform: translateY(-2px); }

.site-header { background: var(--bg-dark); padding: 18px 0; position: relative; z-index: 100; border-bottom: 1px solid var(--border-dark); }
.nav-panel { display: flex; align-items: center; justify-content: space-between; background: var(--surface-dark); border: 1px solid var(--border-dark); border-radius: 18px; padding: 8px 12px; box-shadow: 0 4px 20px rgba(0,0,0,0.3); gap: 12px; }
.nav-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-badge { width: 38px; height: 38px; border-radius: 10px; background: linear-gradient(135deg, var(--primary), var(--accent)); display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 800; font-size: 15px; letter-spacing: 0; box-shadow: 0 0 12px rgba(139,92,246,0.4); }
.logo-name { color: var(--text-dark-bg); font-size: 17px; font-weight: 700; white-space: nowrap; }
.nav-menu { display: flex; align-items: center; gap: 8px; margin: 0 auto; }
.nav-item { display: flex; align-items: center; gap: 7px; padding: 0 14px; height: 44px; border-radius: var(--radius-md); background: rgba(255,255,255,0.05); border: 1px solid transparent; color: var(--text-dark-sub); font-size: 14px; font-weight: 500; transition: var(--transition); }
.nav-item:hover { background: rgba(139,92,246,0.2); color: #fff; transform: translateY(-1px); }
.nav-item.active { border: 1px solid var(--primary); color: var(--primary); background: rgba(139,92,246,0.15); }
.nav-item i { font-size: 16px; width: 18px; text-align: center; }
.nav-label { white-space: nowrap; }
.nav-cta { padding: 10px 20px; font-size: 14px; border-radius: var(--radius-sm); flex-shrink: 0; }
.nav-toggle { display: none; width: 42px; height: 42px; border-radius: 10px; background: rgba(255,255,255,0.06); border: 1px solid var(--border-dark); color: var(--text-dark-bg); font-size: 18px; align-items: center; justify-content: center; }

.hero { background: var(--bg-dark); color: var(--text-dark-bg); position: relative; padding: 96px 0 88px; overflow: hidden; }
.hero .hero-bg { position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat; opacity: 0.14; }
.hero::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(139,92,246,0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(139,92,246,0.06) 1px, transparent 1px); background-size: 44px 44px; pointer-events: none; }
.hero .container { position: relative; z-index: 2; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-dark-sub); margin-bottom: 36px; flex-wrap: wrap; }
.breadcrumb a { color: var(--accent); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span.sep { color: rgba(255,255,255,0.3); }
.hero-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 56px; align-items: center; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(139,92,246,0.15); border: 1px solid rgba(139,92,246,0.4); color: var(--primary); font-size: 13px; font-weight: 600; padding: 6px 16px; border-radius: 30px; margin-bottom: 22px; }
.hero-title { font-size: clamp(2rem, 4vw, 3.25rem); font-weight: 800; line-height: 1.25; letter-spacing: -0.01em; margin-bottom: 18px; }
.hero-title .highlight { color: var(--accent); }
.hero-sub { font-size: clamp(1rem, 1.5vw, 1.125rem); color: var(--text-dark-sub); line-height: 1.75; margin-bottom: 32px; max-width: 540px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-pic { position: relative; border-radius: 24px; overflow: hidden; box-shadow: var(--shadow-dark); border: 1px solid var(--border-dark); aspect-ratio: 5 / 4; background: var(--surface-dark); }
.hero-pic img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s ease; }
.hero-pic:hover img { transform: scale(1.03); }
.hero-pic::after { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(139,92,246,0.15), rgba(34,211,238,0.06)); pointer-events: none; }

.section { padding: 88px 0; }
.section-light { background: var(--bg-light); }
.section-dark { background: var(--bg-dark); color: var(--text-dark-bg); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.section-tag { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600; color: var(--primary); background: rgba(139,92,246,0.12); border: 1px solid rgba(139,92,246,0.25); padding: 5px 14px; border-radius: 30px; margin-bottom: 16px; }
.section-title { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 700; line-height: 1.3; margin-bottom: 14px; }
.section-sub { color: var(--text-light-sub); font-size: 16px; line-height: 1.7; }
.section-dark .section-sub { color: var(--text-dark-sub); }

.intro-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.intro-card { background: var(--surface-light); border: 1px solid var(--border-light); border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow-light); transition: var(--transition); }
.intro-card:hover { box-shadow: var(--shadow-primary); transform: translateY(-4px); }
.intro-card .intro-icon { width: 48px; height: 48px; border-radius: 12px; background: linear-gradient(135deg, rgba(139,92,246,0.2), rgba(34,211,238,0.15)); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 18px; }
.intro-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--text-light); }
.intro-card p { color: var(--text-light-sub); font-size: 14px; line-height: 1.7; }

.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.guide-card { background: var(--surface-light); border: 1px solid var(--border-light); border-radius: var(--radius-lg); padding: 28px; box-shadow: var(--shadow-light); transition: var(--transition); position: relative; overflow: hidden; }
.guide-card::before { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 3px; background: linear-gradient(90deg, var(--primary), var(--accent)); opacity: 0; transition: var(--transition); }
.guide-card:hover { box-shadow: var(--shadow-primary); transform: translateY(-4px); }
.guide-card:hover::before { opacity: 1; }
.guide-card .card-icon { width: 52px; height: 52px; border-radius: 14px; background: rgba(139,92,246,0.12); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 22px; margin-bottom: 18px; transition: var(--transition); }
.guide-card:nth-child(even) .card-icon { background: rgba(34,211,238,0.12); color: #0891B2; }
.guide-card:hover .card-icon { transform: scale(1.08); }
.guide-card h3 { font-size: 18px; font-weight: 700; color: var(--text-light); margin-bottom: 10px; }
.guide-card p { font-size: 14px; color: var(--text-light-sub); line-height: 1.7; }

.path-section { background: var(--bg-dark); color: var(--text-dark-bg); position: relative; }
.path-section .section-sub { color: var(--text-dark-sub); }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 20px; }
.step { background: var(--surface-dark); border: 1px solid var(--border-dark); border-radius: var(--radius-lg); padding: 36px 28px; position: relative; transition: var(--transition); }
.step:hover { border-color: rgba(139,92,246,0.4); transform: translateY(-4px); box-shadow: var(--shadow-dark); }
.step-num { width: 44px; height: 44px; border-radius: 12px; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; font-size: 18px; font-weight: 700; display: flex; align-items: center; justify-content: center; margin-bottom: 20px; box-shadow: 0 0 16px rgba(139,92,246,0.4); }
.step h3 { font-size: 18px; font-weight: 600; margin-bottom: 12px; color: var(--text-dark-bg); }
.step p { font-size: 14px; color: var(--text-dark-sub); line-height: 1.7; }
.step-arrow { position: absolute; top: 50%; right: -20px; transform: translateY(-50%); width: 32px; height: 32px; background: var(--surface-dark); border: 1px solid var(--border-dark); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--accent); font-size: 12px; z-index: 2; }
.step:last-child .step-arrow { display: none; }

.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-card { background: var(--surface-light); border: 1px solid var(--border-light); border-radius: var(--radius-lg); padding: 32px 24px; text-align: center; box-shadow: var(--shadow-light); transition: var(--transition); }
.stat-card:hover { box-shadow: var(--shadow-primary); transform: translateY(-4px); }
.stat-num { font-size: clamp(2rem, 3vw, 2.75rem); font-weight: 800; color: var(--primary); line-height: 1.2; margin-bottom: 8px; }
.stat-card:nth-child(even) .stat-num { color: #0891B2; }
.stat-label { font-size: 14px; color: var(--text-light-sub); }

.specs-wrap { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items: center; }
.specs-left h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 700; margin-bottom: 16px; }
.specs-left p { color: var(--text-dark-sub); font-size: 15px; line-height: 1.75; }
.specs-list { display: flex; flex-direction: column; }
.spec-row { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; border-bottom: 1px solid var(--border-dark); border-radius: 12px; transition: background 0.2s ease; gap: 16px; }
.spec-row:last-child { border-bottom: none; }
.spec-row:hover { background: rgba(139,92,246,0.08); }
.spec-platform { display: flex; align-items: center; gap: 12px; font-size: 16px; font-weight: 600; color: var(--text-dark-bg); }
.spec-platform i { width: 24px; text-align: center; color: var(--accent); font-size: 18px; }
.spec-detail { font-size: 14px; color: var(--text-dark-sub); text-align: right; }

.faq-section { background: var(--bg-light); }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background: var(--surface-light); border: 1px solid var(--border-light); border-radius: var(--radius-lg); margin-bottom: 16px; box-shadow: var(--shadow-light); transition: var(--transition); overflow: hidden; }
.faq-item:hover { box-shadow: var(--shadow-primary); }
.faq-item.open { border-color: rgba(139,92,246,0.3); }
.faq-q { display: flex; align-items: center; justify-content: space-between; padding: 22px 28px; cursor: pointer; font-size: 17px; font-weight: 600; color: var(--text-light); gap: 16px; }
.faq-icon { position: relative; width: 22px; height: 22px; flex-shrink: 0; }
.faq-icon::before, .faq-icon::after { content: ""; position: absolute; background: var(--primary); border-radius: 2px; transition: transform 0.3s ease; }
.faq-icon::before { width: 22px; height: 2px; top: 10px; left: 0; }
.faq-icon::after { width: 2px; height: 22px; top: 0; left: 10px; }
.faq-item.open .faq-icon::after { transform: rotate(90deg); }
.faq-a { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.3s ease; }
.faq-a-inner { overflow: hidden; }
.faq-item.open .faq-a { grid-template-rows: 1fr; }
.faq-a p { padding: 0 28px 24px; font-size: 14px; color: var(--text-light-sub); line-height: 1.7; }

.cta-section { background: var(--bg-dark); color: var(--text-dark-bg); text-align: center; position: relative; overflow: hidden; }
.cta-section::before { content: ""; position: absolute; inset: 0; background: radial-gradient(ellipse at center, rgba(139,92,246,0.18), transparent 70%); pointer-events: none; }
.cta-section .container { position: relative; z-index: 2; }
.cta-title { font-size: clamp(1.75rem, 3.5vw, 2.75rem); font-weight: 800; margin-bottom: 16px; }
.cta-desc { color: var(--text-dark-sub); font-size: 16px; max-width: 600px; margin: 0 auto 36px; line-height: 1.7; }
.cta-download-btn { display: inline-flex; align-items: center; gap: 12px; min-height: 56px; padding: 16px 44px; border-radius: 14px; background: linear-gradient(135deg, #FF7A45, #FF9F68); color: #fff; font-size: 17px; font-weight: 700; box-shadow: 0 8px 28px rgba(255,122,69,0.4); transition: var(--transition); }
.cta-download-btn:hover { transform: translateY(-3px); filter: brightness(1.08); box-shadow: 0 12px 36px rgba(255,122,69,0.5); }
.cta-download-btn:active { transform: translateY(0); }
.cta-download-btn i { font-size: 20px; }
.cta-secondary-btns { display: flex; justify-content: center; gap: 14px; margin-top: 20px; flex-wrap: wrap; }
.cta-secondary-btns .btn { padding: 10px 24px; font-size: 14px; }
.cta-meta { color: rgba(255,255,255,0.4); font-size: 13px; margin-top: 28px; letter-spacing: 0.02em; }

.site-footer { background: var(--bg-dark); color: var(--text-dark-sub); padding: 64px 0 0; border-top: 1px solid var(--border-dark); }
.footer-grid { display: grid; grid-template-columns: 1.2fr 0.8fr 1fr; gap: 48px; padding-bottom: 48px; }
.footer-brand p { font-size: 14px; line-height: 1.7; margin-top: 18px; max-width: 320px; }
.footer-title { font-size: 15px; font-weight: 600; color: var(--text-dark-bg); margin-bottom: 18px; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: 14px; color: var(--text-dark-sub); transition: var(--transition); }
.footer-links a:hover { color: var(--accent); padding-left: 4px; }
.footer-contact p { display: flex; align-items: center; gap: 10px; font-size: 14px; margin-bottom: 12px; }
.footer-contact i { color: var(--accent); width: 18px; }
.footer-copyright { border-top: 1px solid var(--border-dark); padding: 20px 0; text-align: center; font-size: 13px; color: rgba(255,255,255,0.35); }

@media (max-width: 1023px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-pic { max-width: 560px; }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .step-arrow { display: none; }
  .specs-wrap { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-item { padding: 0 10px; }
  .nav-item .nav-label { font-size: 13px; }
}

@media (max-width: 767px) {
  .section { padding: 64px 0; }
  .nav-panel { flex-wrap: wrap; }
  .nav-toggle { display: inline-flex; }
  .nav-menu { display: none; width: 100%; order: 4; flex-direction: column; background: var(--surface-dark); border: 1px solid var(--border-dark); border-radius: var(--radius-md); padding: 16px; margin-top: 8px; gap: 10px; }
  .nav-menu.open { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
  .nav-item { justify-content: center; padding: 0; height: 46px; }
  .nav-cta { display: none; }
  .nav-label { font-size: 14px; }
  .hero { padding: 72px 0 60px; }
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { width: 100%; }
  .intro-grid { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .step-arrow { display: none; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .spec-row { flex-direction: column; align-items: flex-start; text-align: left; }
  .spec-detail { text-align: left; }
  .faq-q { padding: 18px 20px; font-size: 15px; }
  .faq-a p { padding: 0 20px 20px; }
  .cta-download-btn { width: 100%; justify-content: center; }
  .cta-secondary-btns { flex-direction: column; }
  .cta-secondary-btns .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-copyright { font-size: 12px; }
}

@media (max-width: 520px) {
  .logo-name { font-size: 15px; }
  .logo-badge { width: 34px; height: 34px; font-size: 13px; }
  .hero-title { font-size: 1.75rem; }
  .section-title { font-size: 1.4rem; }
  .stats-row { gap: 12px; }
  .stat-card { padding: 22px 12px; }
  .stat-num { font-size: 1.6rem; }
  .footer-contact p { font-size: 13px; }
}

/* roulang page: article */
:root {
  --bg-dark: #0F0620;
  --bg-light: #F7F8FB;
  --surface-dark: #1B1031;
  --surface-light: #FFFFFF;
  --primary: #8B5CF6;
  --accent: #22D3EE;
  --cta: #FF7A45;
  --success: #34D399;
  --star: #FBBF24;
  --text-dark-bg: #F1F0F7;
  --text-dark-sub: #B5A8D9;
  --text-light: #1C1830;
  --text-light-sub: #6B7280;
  --border-dark: rgba(255, 255, 255, 0.08);
  --border-light: #E5E7EB;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --shadow-light: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.25);
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-light);
  background: var(--bg-light);
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ===== Header / Nav ===== */
.site-header {
  background: var(--bg-dark);
  padding: 20px 0;
  border-bottom: 1px solid var(--border-dark);
}
.nav-panel {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface-dark);
  border: 1px solid var(--border-dark);
  border-radius: 18px;
  padding: 8px 16px;
  box-shadow: var(--shadow-dark);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: 8px;
  flex-shrink: 0;
}
.logo-badge {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.02em;
}
.logo-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-dark-bg);
  white-space: nowrap;
}
.nav-menu {
  display: flex;
  gap: 8px;
  flex: 1;
}
.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-dark-sub);
  font-size: 15px;
  font-weight: 500;
  transition: all 0.2s ease;
  white-space: nowrap;
  border: 1px solid transparent;
}
.nav-item:hover {
  background: rgba(139, 92, 246, 0.2);
  color: var(--text-dark-bg);
}
.nav-item.active {
  background: rgba(139, 92, 246, 0.25);
  border-color: rgba(139, 92, 246, 0.5);
  color: var(--text-dark-bg);
}
.nav-item.active i {
  color: var(--primary);
}
.nav-item i {
  font-size: 16px;
  color: var(--accent);
  transition: color 0.2s ease;
}
.nav-cta {
  margin-left: auto;
  flex-shrink: 0;
}
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-dark-bg);
  font-size: 18px;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}
.nav-toggle:hover {
  background: rgba(139, 92, 246, 0.2);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.btn-cta {
  background: linear-gradient(135deg, var(--cta), #FF9F68);
  color: #fff;
  box-shadow: 0 4px 12px rgba(255, 122, 69, 0.3);
}
.btn-cta:hover {
  filter: brightness(1.1);
  box-shadow: 0 6px 20px rgba(255, 122, 69, 0.4);
  transform: translateY(-1px);
}
.btn-cta:active {
  filter: brightness(0.95);
  transform: translateY(0);
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: rgba(139, 92, 246, 0.85);
  box-shadow: 0 4px 16px rgba(139, 92, 246, 0.35);
  transform: translateY(-1px);
}
.btn-lg {
  padding: 16px 36px;
  font-size: 17px;
  border-radius: 14px;
}

/* ===== Article Page ===== */
.article-page {
  padding: 48px 0 80px;
  background: var(--bg-light);
  min-height: 60vh;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-light-sub);
  margin-bottom: 24px;
}
.breadcrumb a {
  color: var(--primary);
  font-weight: 500;
  transition: color 0.2s ease;
}
.breadcrumb a:hover {
  color: var(--accent);
}
.breadcrumb-sep {
  color: #c0c0c0;
}
.breadcrumb .current {
  color: var(--text-light-sub);
  max-width: 360px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.article-card {
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-light);
  padding: 48px 56px;
}
.article-header {
  text-align: center;
  margin-bottom: 40px;
}
.article-header h1 {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-light);
  margin-bottom: 18px;
}
.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  color: var(--text-light-sub);
  font-size: 14px;
}
.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.article-meta i {
  color: var(--primary);
  font-size: 14px;
}
.article-body {
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-light);
  word-break: break-word;
}
.article-body p {
  margin-bottom: 24px;
  text-align: justify;
}
.article-body h2,
.article-body h3,
.article-body h4 {
  font-weight: 700;
  color: var(--text-light);
  margin-top: 40px;
  margin-bottom: 14px;
  line-height: 1.4;
}
.article-body h2 {
  font-size: 1.5rem;
}
.article-body h3 {
  font-size: 1.25rem;
  margin-top: 32px;
}
.article-body h4 {
  font-size: 1.1rem;
  margin-top: 24px;
}
.article-body ul,
.article-body ol {
  margin: 0 0 24px 0;
  padding-left: 24px;
}
.article-body li {
  margin-bottom: 8px;
}
.article-body img {
  border-radius: var(--radius-md);
  margin: 24px 0;
  max-width: 100%;
  height: auto;
}
.article-body blockquote {
  border-left: 4px solid var(--primary);
  padding: 16px 24px;
  background: rgba(139, 92, 246, 0.06);
  border-radius: 0 8px 8px 0;
  margin: 24px 0;
  color: var(--text-light-sub);
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 15px;
}
.article-body th,
.article-body td {
  border: 1px solid var(--border-light);
  padding: 12px;
  text-align: left;
}
.article-body th {
  background: rgba(139, 92, 246, 0.08);
  font-weight: 600;
}
.article-body pre {
  background: var(--bg-dark);
  color: var(--text-dark-bg);
  padding: 20px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 14px;
  line-height: 1.6;
  margin: 24px 0;
}
.article-body code {
  background: rgba(139, 92, 246, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  font-family: "SFMono-Regular", Consolas, monospace;
}
.article-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}
.article-empty {
  text-align: center;
  padding: 80px 24px;
  max-width: 640px;
  margin: 0 auto;
}
.article-empty i {
  font-size: 48px;
  color: var(--primary);
  margin-bottom: 16px;
}
.article-empty .empty-title {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-light);
  margin-bottom: 12px;
}
.article-empty p {
  color: var(--text-light-sub);
  margin-bottom: 24px;
}
.article-footer {
  max-width: 800px;
  margin: 40px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 6px;
  background: rgba(139, 92, 246, 0.1);
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
  transition: background 0.2s ease, color 0.2s ease;
}
.tag:hover {
  background: var(--primary);
  color: #fff;
}
.tag i {
  font-size: 12px;
}

/* ===== Related ===== */
.related-section {
  margin-top: 48px;
}
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.section-title {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  font-weight: 700;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-title i {
  color: var(--primary);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.related-card {
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-light);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}
.related-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(139, 92, 246, 0.15);
}
.related-card .thumb {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-dark);
}
.related-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.related-card:hover .thumb img {
  transform: scale(1.03);
}
.related-body {
  padding: 18px 20px 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.related-body h3 {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-light);
  margin-bottom: 8px;
}
.related-body p {
  font-size: 14px;
  color: var(--text-light-sub);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
  flex: 1;
}
.related-link {
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 0.2s ease;
}
.related-link:hover {
  color: var(--accent);
}
.related-link i {
  font-size: 12px;
}

/* ===== CTA ===== */
.article-cta {
  margin-top: 48px;
}
.cta-card {
  background: var(--bg-dark);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  color: var(--text-dark-bg);
  position: relative;
  overflow: hidden;
}
.cta-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.25), rgba(34, 211, 238, 0.08));
  pointer-events: none;
}
.cta-badge {
  position: relative;
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(139, 92, 246, 0.25);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 14px;
}
.cta-card h2 {
  position: relative;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-dark-bg);
}
.cta-card p {
  position: relative;
  color: var(--text-dark-sub);
  font-size: 16px;
  margin-bottom: 24px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}
.cta-card .btn {
  position: relative;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-dark);
  color: var(--text-dark-sub);
  padding: 64px 0 24px;
  border-top: 1px solid var(--border-dark);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  margin-top: 16px;
  max-width: 340px;
}
.footer-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dark-bg);
  margin-bottom: 16px;
}
.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  color: var(--text-dark-sub);
  font-size: 14px;
  transition: color 0.2s ease;
}
.footer-links a:hover {
  color: var(--accent);
}
.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-contact p {
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-contact i {
  color: var(--accent);
  width: 16px;
  text-align: center;
}
.footer-copyright {
  border-top: 1px solid var(--border-dark);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--text-dark-sub);
}

/* ===== Responsive ===== */
@media (max-width: 1023px) {
  .nav-menu {
    gap: 6px;
  }
  .nav-item {
    padding: 8px 12px;
    font-size: 14px;
  }
  .logo-name {
    font-size: 16px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-card {
    padding: 36px 32px;
  }
}
@media (max-width: 767px) {
  .site-header {
    padding: 12px 0;
  }
  .nav-panel {
    flex-wrap: wrap;
    padding: 10px;
    gap: 10px;
  }
  .nav-logo {
    order: 1;
    flex: 1;
  }
  .nav-toggle {
    order: 2;
    display: inline-flex;
  }
  .nav-menu {
    order: 3;
    flex-basis: 100%;
    display: none;
    flex-direction: column;
    gap: 8px;
  }
  .nav-menu.open {
    display: flex;
  }
  .nav-item {
    width: 100%;
    justify-content: center;
    padding: 12px;
  }
  .nav-cta {
    order: 4;
    width: 100%;
    margin-left: 0;
  }
  .article-page {
    padding: 32px 0 56px;
  }
  .article-card {
    padding: 24px 20px;
  }
  .article-header h1 {
    font-size: 1.6rem;
  }
  .article-meta {
    flex-direction: column;
    gap: 6px;
  }
  .article-body {
    font-size: 16px;
  }
  .article-body p {
    text-align: left;
  }
  .breadcrumb .current {
    max-width: 200px;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .cta-card {
    padding: 40px 20px;
  }
  .cta-card .btn {
    width: 100%;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .btn-lg {
    width: 100%;
  }
}

/* roulang page: category2 */
:root {
  --bg-dark: #0F0620;
  --bg-light: #F7F8FB;
  --surface-dark: #1B1031;
  --surface-light: #FFFFFF;
  --primary: #8B5CF6;
  --accent: #22D3EE;
  --cta: #FF7A45;
  --cta-light: #FF9F68;
  --success: #34D399;
  --star: #FBBF24;
  --text-dark-bg: #F1F0F7;
  --text-dark-sub: #B5A8D9;
  --text-light: #1C1830;
  --text-light-sub: #6B7280;
  --border-dark: rgba(255,255,255,0.08);
  --border-light: #E5E7EB;
  --grad-brand: linear-gradient(135deg, rgba(139,92,246,0.4), rgba(34,211,238,0.15));
  --grad-cta: linear-gradient(135deg, #FF7A45, #FF9F68);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --shadow-card: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-dark: 0 8px 32px rgba(0,0,0,0.25);
  --shadow-hover: 0 12px 32px rgba(139,92,246,0.18);
  --container: 1200px;
  --spacer: 96px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg-light);
  color: var(--text-light);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: color .2s ease; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.section { padding: var(--spacer) 0; }
.section-sm { padding: 64px 0; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: 10px;
  padding: 14px 28px;
  line-height: 1.4;
  transition: all .2s ease;
  white-space: nowrap;
}
.btn-cta {
  background: var(--grad-cta);
  color: #fff;
  box-shadow: 0 6px 20px rgba(255,122,69,0.3);
}
.btn-cta:hover { background: linear-gradient(135deg, #ff8f5f, #ffb084); box-shadow: 0 10px 28px rgba(255,122,69,0.4); transform: translateY(-2px); color: #fff; }
.btn-cta:active { transform: translateY(0); box-shadow: 0 4px 14px rgba(255,122,69,0.25); }
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 6px 20px rgba(139,92,246,0.28);
}
.btn-primary:hover { background: linear-gradient(135deg, #7a4cf0, #22D3EE); color: #fff; transform: translateY(-2px); }
.btn-ghost {
  background: transparent;
  border: 1px solid rgba(34,211,238,0.7);
  color: var(--accent);
}
.btn-ghost:hover { background: rgba(34,211,238,0.1); color: #16b3ce; border-color: var(--accent); }
.btn-lg { height: 56px; padding: 0 42px; font-size: 1.0625rem; border-radius: 14px; }
.btn-sm { padding: 8px 18px; font-size: 0.875rem; border-radius: 8px; }

/* ===== 导航 ===== */
.site-header {
  background: var(--bg-dark);
  padding: 20px 0 0;
  position: relative;
  z-index: 100;
}
.nav-panel {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface-dark);
  border: 1px solid var(--border-dark);
  border-radius: 18px;
  padding: 8px 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-badge {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 14px rgba(139,92,246,0.4);
}
.logo-name {
  color: var(--text-dark-bg);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  justify-content: center;
}
.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 44px;
  padding: 0 16px;
  border-radius: 12px;
  background: rgba(255,255,255,0.05);
  color: var(--text-dark-sub);
  font-size: 0.9375rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: all .2s ease;
  white-space: nowrap;
}
.nav-item i { font-size: 0.9375rem; color: var(--text-dark-sub); transition: color .2s; }
.nav-item:hover { background: rgba(139,92,246,0.2); color: var(--text-dark-bg); }
.nav-item:hover i { color: var(--accent); }
.nav-item.active {
  background: rgba(139,92,246,0.15);
  border-color: rgba(139,92,246,0.5);
  color: var(--text-dark-bg);
}
.nav-item.active i { color: var(--accent); }
.nav-cta {
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 0.9063rem;
  flex-shrink: 0;
}
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(255,255,255,0.06);
  color: var(--text-dark-bg);
  font-size: 1.125rem;
  align-items: center;
  justify-content: center;
  transition: background .2s;
}
.nav-toggle:hover { background: rgba(139,92,246,0.25); }

/* ===== Hero ===== */
.hero {
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
  padding: 80px 0 72px;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(255,255,255,0.04) 0 1px, transparent 1px 60px),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.04) 0 1px, transparent 1px 80px);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--grad-brand);
  opacity: 0.5;
  pointer-events: none;
}
.hero .container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 2;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(139,92,246,0.18);
  border: 1px solid rgba(139,92,246,0.35);
  color: #C4B5FD;
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 22px;
}
.hero h1 {
  color: var(--text-dark-bg);
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 18px;
}
.hero h1 .highlight {
  background: linear-gradient(90deg, var(--accent), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  color: var(--text-dark-sub);
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 28px;
  max-width: 520px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0,0,0,0.4);
  border: 1px solid var(--border-dark);
  aspect-ratio: 4 / 3;
}
.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-visual .visual-overlay {
  position: absolute;
  inset: auto 0 0 0;
  padding: 22px 20px;
  background: linear-gradient(to top, rgba(15,6,32,0.92), rgba(15,6,32,0));
  color: var(--text-dark-bg);
}
.hero-visual .visual-overlay p { font-size: 0.9375rem; font-weight: 600; }

/* ===== 通用板块头部 ===== */
.section-head {
  text-align: center;
  margin-bottom: 52px;
}
.section-head .eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  color: var(--text-light);
  margin-bottom: 12px;
  line-height: 1.3;
}
.section-head p {
  color: var(--text-light-sub);
  max-width: 680px;
  margin: 0 auto;
  font-size: 1rem;
  line-height: 1.7;
}
.section-head.light h2 { color: var(--text-dark-bg); }
.section-head.light p { color: var(--text-dark-sub); }

/* ===== 卖点卡 ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  box-shadow: var(--shadow-card);
  transition: all .2s ease;
  position: relative;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.feature-card .card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.375rem;
  margin-bottom: 20px;
}
.feature-card:nth-child(1) .card-icon { background: rgba(139,92,246,0.12); color: var(--primary); }
.feature-card:nth-child(2) .card-icon { background: rgba(34,211,238,0.12); color: #0e9bb8; }
.feature-card:nth-child(3) .card-icon { background: rgba(255,122,69,0.12); color: var(--cta); }
.feature-card h3 { font-size: 1.1875rem; font-weight: 700; margin-bottom: 10px; color: var(--text-light); }
.feature-card p { font-size: 0.9375rem; line-height: 1.7; color: var(--text-light-sub); }
.feature-card .card-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 0.8125rem;
  color: var(--primary);
}
.feature-card .card-meta i { font-size: 0.75rem; }

/* ===== 适用场景 ===== */
.scenarios {
  background: var(--bg-dark);
  position: relative;
}
.scenarios::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0 1px, transparent 1px 30px);
  pointer-events: none;
}
.scenarios .section-head { position: relative; }
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}
.scenario-card {
  background: var(--surface-dark);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all .2s ease;
  display: flex;
  flex-direction: column;
}
.scenario-card:hover { transform: translateY(-6px); border-color: rgba(139,92,246,0.5); box-shadow: 0 12px 36px rgba(0,0,0,0.4); }
.scenario-card .scenario-thumb {
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  position: relative;
}
.scenario-card .scenario-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s ease; }
.scenario-card:hover .scenario-thumb img { transform: scale(1.05); }
.scenario-card .scenario-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(15,6,32,0.5), transparent 45%);
}
.scenario-card .scenario-body { padding: 20px 20px 24px; }
.scenario-card .scenario-tag {
  display: inline-block;
  background: rgba(34,211,238,0.12);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.scenario-card h3 { color: var(--text-dark-bg); font-size: 1.0625rem; font-weight: 700; margin-bottom: 8px; }
.scenario-card p { color: var(--text-dark-sub); font-size: 0.875rem; line-height: 1.7; }

/* ===== 流程 ===== */
.steps {
  background: var(--bg-light);
}
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  counter-reset: step;
  position: relative;
}
.steps-grid::before {
  content: "";
  position: absolute;
  top: 80px;
  left: 12.5%;
  right: 12.5%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0.25;
  z-index: 0;
}
.step-item {
  text-align: center;
  padding: 0 12px;
  position: relative;
  z-index: 1;
}
.step-num {
  width: 70px;
  height: 70px;
  margin: 0 auto 20px;
  background: var(--surface-light);
  border: 2px solid var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  box-shadow: 0 8px 24px rgba(139,92,246,0.2);
  position: relative;
}
.step-num::after {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 1px dashed rgba(139,92,246,0.3);
}
.step-item h3 { font-size: 1.0625rem; font-weight: 700; color: var(--text-light); margin-bottom: 8px; }
.step-item p { font-size: 0.875rem; color: var(--text-light-sub); line-height: 1.7; }

/* ===== 数据指标 ===== */
.stats {
  background: var(--surface-dark);
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding: 48px 0;
}
.stat-item { text-align: center; }
.stat-item .stat-value {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 8px;
}
.stat-item .stat-label { color: var(--text-dark-sub); font-size: 0.9375rem; font-weight: 500; }

/* ===== 评级 / 评价 ===== */
.testimonials {
  background: var(--bg-light);
}
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.testimonial-card {
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: all .2s ease;
}
.testimonial-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.testimonial-card:nth-child(2) { transform: scale(1.03); box-shadow: 0 12px 32px rgba(139,92,246,0.14); }
.testimonial-card:nth-child(2):hover { transform: scale(1.03) translateY(-4px); }
.stars { display: flex; gap: 2px; margin-bottom: 14px; }
.stars i { color: var(--star); font-size: 0.9375rem; }
.testimonial-text { font-size: 0.9375rem; color: var(--text-light-sub); line-height: 1.75; margin-bottom: 18px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.testimonial-user { display: flex; align-items: center; gap: 10px; }
.user-avatar { width: 36px; height: 36px; border-radius: 50%; background: linear-gradient(135deg, rgba(139,92,246,0.35), rgba(34,211,238,0.25)); display: flex; align-items: center; justify-content: center; font-weight: 700; color: var(--primary); font-size: 0.9063rem; }
.user-meta .user-name { font-size: 0.875rem; font-weight: 600; color: var(--text-light); }
.user-meta .user-date { font-size: 0.75rem; color: var(--text-light-sub); }

/* ===== FAQ ===== */
.faq-section {
  background: var(--bg-light);
}
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  margin-bottom: 14px;
  overflow: hidden;
  transition: all .2s ease;
}
.faq-item:hover { border-color: rgba(139,92,246,0.35); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-light);
  text-align: left;
  gap: 16px;
  transition: color .2s;
}
.faq-question:hover { color: var(--primary); }
.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(139,92,246,0.1);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  font-weight: 400;
  transition: transform .25s ease;
  flex-shrink: 0;
}
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
  padding: 0 24px;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  color: var(--text-light-sub);
  font-size: 0.9375rem;
  line-height: 1.75;
  transition: max-height .25s ease, padding .25s ease;
}
.faq-item.active .faq-answer {
  max-height: 400px;
  padding-bottom: 20px;
}

/* ===== CTA ===== */
.cta-section {
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
  padding: 72px 0;
}
.cta-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(ellipse at 20% 60%, rgba(34,211,238,0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 30%, rgba(139,92,246,0.12) 0%, transparent 55%);
  pointer-events: none;
}
.cta-section .container { position: relative; z-index: 2; text-align: center; }
.cta-section h2 { color: var(--text-dark-bg); font-size: clamp(1.75rem, 3.5vw, 2.5rem); font-weight: 800; margin-bottom: 14px; }
.cta-section > .container > p { color: var(--text-dark-sub); max-width: 620px; margin: 0 auto 32px; font-size: 1rem; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.cta-aux {
  margin-top: 24px;
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}
.cta-aux .btn-aux {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-dark);
  color: var(--text-dark-sub);
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 0.8125rem;
  transition: all .2s;
}
.cta-aux .btn-aux:hover { background: rgba(255,255,255,0.12); color: var(--text-dark-bg); }
.cta-note { margin-top: 16px; color: var(--text-dark-sub); opacity: 0.7; font-size: 0.8125rem; }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg-dark);
  padding-top: 64px;
  padding-bottom: 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 44px;
}
.footer-brand p { color: var(--text-dark-sub); font-size: 0.9375rem; margin-top: 16px; line-height: 1.7; max-width: 320px; }
.footer-title {
  color: var(--text-dark-bg);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: var(--text-dark-sub); font-size: 0.9375rem; transition: all .2s; }
.footer-links a:hover { color: var(--accent); padding-left: 4px; }
.footer-contact p { color: var(--text-dark-sub); font-size: 0.9375rem; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.footer-contact i { color: var(--accent); width: 20px; text-align: center; }
.footer-copyright {
  border-top: 1px solid var(--border-dark);
  padding-top: 24px;
  text-align: center;
  color: var(--text-dark-sub);
  font-size: 0.8125rem;
  opacity: 0.8;
}

/* ===== 响应式 ===== */
@media (max-width: 1023px) {
  :root { --spacer: 64px; }
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { max-width: 560px; margin: 0 auto; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); gap: 32px 0; }
  .steps-grid::before { display: none; }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 767px) {
  :root { --spacer: 48px; }
  .nav-panel { flex-wrap: wrap; }
  .nav-menu {
    display: none;
    width: 100%;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    background: var(--surface-dark);
    border-top: 1px solid var(--border-dark);
    padding-top: 8px;
    margin-top: 4px;
  }
  .nav-menu.open { display: flex; }
  .nav-item { justify-content: center; }
  .nav-toggle { display: flex; margin-left: auto; }
  .nav-cta { display: none; }
  .nav-menu .nav-cta { display: flex; width: 100%; justify-content: center; margin-top: 8px; }
  .hero { padding: 48px 0; }
  .hero-actions .btn { flex: 1; }
  .features-grid { grid-template-columns: 1fr; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .testimonial-card:nth-child(2) { transform: none; }
  .testimonial-card:nth-child(2):hover { transform: translateY(-4px); }
  .steps-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .cta-actions .btn { width: 100%; }
}

@media (max-width: 520px) {
  .stats-grid { grid-template-columns: 1fr; }
  .logo-name { font-size: 0.9375rem; }
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; }
  .section-head p { font-size: 0.9375rem; }
}

/* ===== 焦点可见性 ===== */
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ===== 简洁滚动条 ===== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(139,92,246,0.3); border-radius: 999px; }
::-webkit-scrollbar-thumb:hover { background: rgba(139,92,246,0.5); }