/* roulang page: index */
:root {
  --bg-primary: #070B14;
  --bg-secondary: #0D1420;
  --bg-footer: #05080F;
  --primary: #28A5FF;
  --primary-light: #4CB8FF;
  --accent: #00E5CC;
  --warning: #FF9F43;
  --text-primary: #E7EDF5;
  --text-secondary: #8A94A6;
  --border: #1E293B;
  --glass-bg: rgba(255, 255, 255, 0.045);
  --glass-border: rgba(255, 255, 255, 0.09);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 24px rgba(40, 165, 255, 0.35);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --space-section: clamp(4rem, 8vw, 7rem);
  --font-stack: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-num: 'Inter', 'Rajdhani', 'PingFang SC', sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-stack);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
ul, ol { list-style: none; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }
input { font-family: inherit; border: none; outline: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; position: relative; z-index: 2; }
section { position: relative; }
::selection { background: rgba(40, 165, 255, 0.35); color: #fff; }
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: #2A3A50; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #3A4A60; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; font-weight: 600; font-size: 0.95rem;
  padding: 12px 28px; border-radius: 10px; cursor: pointer;
  transition: var(--transition); letter-spacing: 0.01em; line-height: 1.4;
  border: 1px solid transparent; white-space: nowrap;
}
.btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.btn-primary {
  background: var(--primary); color: #05111F;
  box-shadow: 0 0 20px rgba(40, 165, 255, 0.35);
}
.btn-primary:hover {
  background: var(--primary-light); color: #061020;
  box-shadow: 0 0 28px rgba(40, 165, 255, 0.6);
  transform: translateY(-2px);
}
.btn-primary:active { transform: translateY(0); box-shadow: 0 0 16px rgba(40, 165, 255, 0.4); }
.btn-glass {
  background: rgba(255, 255, 255, 0.04);
  color: var(--primary);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.btn-glass:hover {
  border-color: var(--primary);
  background: rgba(40, 165, 255, 0.08);
  color: var(--primary-light);
}
.btn-outline {
  background: transparent; color: var(--primary);
  border: 1px solid rgba(40, 165, 255, 0.5);
}
.btn-outline:hover { background: rgba(40, 165, 255, 0.08); border-color: var(--primary); }
.text-link {
  color: var(--primary); border-bottom: 1px dashed rgba(40, 165, 255, 0.4);
  padding-bottom: 2px; font-weight: 500;
}
.text-link:hover { border-bottom-style: solid; color: var(--accent); }

/* ===== Header / Nav ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: transparent;
  transition: background 0.4s ease, box-shadow 0.4s ease, border-color 0.4s ease;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(7, 11, 20, 0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; gap: 24px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  flex-shrink: 0; color: var(--text-primary);
}
.brand-icon {
  width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(40, 165, 255, 0.2), rgba(0, 229, 204, 0.15));
  border-radius: 10px; border: 1px solid rgba(40, 165, 255, 0.3);
  flex-shrink: 0;
}
.brand-icon svg { width: 20px; height: 20px; }
.brand-name { font-size: 1.125rem; font-weight: 700; letter-spacing: 0.02em; }
.nav-links {
  display: flex; align-items: center; gap: 32px; margin: 0 auto;
}
.nav-links a {
  position: relative; font-size: 0.95rem; color: var(--text-secondary);
  font-weight: 500; padding: 6px 0;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 0; height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px; transition: width 0.35s ease;
}
.nav-links a:hover { color: var(--primary); }
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--primary); }
.nav-links a.active::after { width: 100%; }
.nav-right {
  display: flex; align-items: center; gap: 16px; flex-shrink: 0;
}
.nav-search {
  display: flex; align-items: center; position: relative;
}
.nav-search input {
  width: 160px; height: 38px; padding: 0 36px 0 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px; color: var(--text-primary); font-size: 0.85rem;
  transition: var(--transition);
}
.nav-search input:focus {
  width: 220px; border-color: rgba(40, 165, 255, 0.5);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 3px rgba(40, 165, 255, 0.15);
}
.nav-search input::placeholder { color: rgba(138, 148, 166, 0.7); }
.nav-search button {
  position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  color: var(--text-secondary); display: flex; align-items: center; justify-content: center;
  padding: 4px;
}
.nav-search button:hover { color: var(--primary); }
.nav-search button svg { width: 16px; height: 16px; }
.nav-auth {
  color: var(--text-secondary); font-size: 0.875rem; font-weight: 500;
  padding: 6px 4px;
}
.nav-auth:hover { color: var(--primary); }
.btn-nav {
  padding: 8px 20px; font-size: 0.875rem;
  border-radius: 10px; font-weight: 600;
  background: var(--primary); color: #05111F;
  box-shadow: 0 0 16px rgba(40, 165, 255, 0.3);
  transition: var(--transition);
}
.btn-nav:hover { background: var(--primary-light); box-shadow: 0 0 24px rgba(40, 165, 255, 0.5); transform: translateY(-1px); }
.btn-nav:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  padding: 8px; cursor: pointer; z-index: 1002;
}
.hamburger span {
  width: 22px; height: 2px; background: var(--text-primary);
  border-radius: 2px; transition: var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu {
  position: fixed; top: 0; right: 0; bottom: 0; width: 320px; max-width: 85vw;
  background: rgba(9, 14, 25, 0.98);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-left: 1px solid rgba(255, 255, 255, 0.06);
  padding: 90px 32px 32px; z-index: 1001;
  transform: translateX(100%); transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex; flex-direction: column; gap: 8px;
  overflow-y: auto;
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu a {
  color: var(--text-secondary); font-size: 1.05rem; font-weight: 500;
  padding: 14px 4px; border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.mobile-menu a:hover, .mobile-menu a.active { color: var(--primary); }
.mobile-menu .m-search {
  margin-top: 16px; margin-bottom: 12px;
}
.mobile-menu .m-search input {
  width: 100%; height: 42px; padding: 0 42px 0 16px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 21px; color: var(--text-primary); font-size: 0.9rem;
}
.mobile-menu .m-search input::placeholder { color: rgba(138, 148, 166, 0.6); }
.mobile-menu .m-login { color: var(--text-secondary); font-size: 0.95rem; padding: 12px 0; }
.mobile-menu .m-btn { margin-top: 8px; width: 100%; justify-content: center; }
.menu-overlay {
  position: fixed; inset: 0; background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(2px); z-index: 1000; opacity: 0; pointer-events: none;
  transition: opacity 0.3s ease;
}
.menu-overlay.show { opacity: 1; pointer-events: auto; }

/* ===== Hero ===== */
.hero {
  min-height: 80vh; padding: 140px 0 80px; position: relative;
  display: flex; align-items: center; overflow: hidden;
  background: var(--bg-primary);
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-image: url('/assets/images/backpic/back-1.webp');
  background-size: cover; background-position: center center;
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(7, 11, 20, 0.75) 0%, rgba(7, 11, 20, 0.55) 50%, var(--bg-primary) 100%);
}
.hero-glow {
  position: absolute; z-index: 1; border-radius: 50%; pointer-events: none;
  filter: blur(90px);
}
.hero-glow-left {
  top: -60px; left: -80px; width: 480px; height: 480px;
  background: rgba(40, 165, 255, 0.2);
}
.hero-glow-right {
  top: 40px; right: -60px; width: 380px; height: 380px;
  background: rgba(0, 229, 204, 0.14);
}
.hero-circuit {
  position: absolute; inset: 0; z-index: 1; opacity: 0.25; pointer-events: none;
  background-image: radial-gradient(circle at 1px 1px, rgba(40, 165, 255, 0.5) 1px, transparent 0);
  background-size: 42px 42px;
  -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
}
.hero .container {
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 60px; align-items: center;
  width: 100%;
}
.hero-copy { position: relative; z-index: 2; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(40, 165, 255, 0.12);
  border: 1px solid rgba(40, 165, 255, 0.25);
  color: var(--primary); font-size: 0.8rem; font-weight: 500;
  padding: 6px 14px; border-radius: 20px; margin-bottom: 24px;
  letter-spacing: 0.03em;
}
.hero-badge .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 8px rgba(0, 229, 204, 0.8);
  animation: pulse-dot 2s ease infinite;
}
@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.7; }
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 800; line-height: 1.2; letter-spacing: -0.01em;
  color: var(--text-primary); margin-bottom: 20px;
}
.hero h1 .gradient-text {
  background: linear-gradient(90deg, var(--primary), var(--accent));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero-sub {
  font-size: 1.15rem; color: var(--text-secondary);
  line-height: 1.75; max-width: 540px; margin-bottom: 36px;
}
.hero-ctas { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 32px; }
.hero-trust {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  color: var(--text-secondary); font-size: 0.85rem;
}
.hero-trust .sep {
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--text-secondary); opacity: 0.5;
}
.hero-visual { position: relative; z-index: 2; }
.hero-visual-inner {
  position: relative; border-radius: var(--radius-xl);
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card), inset 0 1px 0 rgba(255, 255, 255, 0.06);
  padding: 14px; overflow: hidden;
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.hero-visual-inner img {
  width: 100%; height: auto; border-radius: calc(var(--radius-xl) - 8px);
  object-fit: cover; aspect-ratio: 4/3;
  background: var(--bg-secondary);
}
.hero-visual-inner::after {
  content: ''; position: absolute; inset: 0; border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(40, 165, 255, 0.12), transparent 50%, rgba(0, 229, 204, 0.08));
  pointer-events: none;
}
.hero-float-tag {
  position: absolute; bottom: 28px; left: -20px;
  background: rgba(9, 14, 25, 0.9);
  border: 1px solid var(--glass-border);
  border-radius: 14px; padding: 10px 16px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 0.8rem; color: var(--text-primary);
  box-shadow: var(--shadow-card);
  display: flex; align-items: center; gap: 8px;
}
.hero-float-tag svg { width: 14px; height: 14px; color: var(--accent); }

/* ===== Stats Bar ===== */
.stats-bar {
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  padding: 48px 0; background: var(--bg-secondary);
}
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.stat-item {
  text-align: center; padding: 8px 24px;
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  position: relative;
}
.stat-item:last-child { border-right: none; }
.stat-number {
  font-family: var(--font-num);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 800; color: var(--text-primary);
  line-height: 1.2; margin-bottom: 4px;
}
.stat-number em {
  font-style: normal; color: var(--primary);
}
.stat-label { font-size: 0.875rem; color: var(--text-secondary); }

/* ===== Section Common ===== */
.section-padding { padding: var(--space-section) 0; }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head h2 {
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
  font-weight: 700; line-height: 1.3; margin-bottom: 14px;
  color: var(--text-primary); letter-spacing: -0.01em;
}
.section-head .section-sub {
  max-width: 640px; margin: 0 auto; color: var(--text-secondary);
  font-size: 1rem; line-height: 1.7;
}
.section-head.left { text-align: left; }
.section-head.left .section-sub { margin: 0; }

/* ===== Values ===== */
.values {
  background: var(--bg-primary);
  padding: var(--space-section) 0;
}
.values-grid {
  display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 72px;
  align-items: start;
}
.values-left { position: sticky; top: 120px; }
.values-left h2 {
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
  font-weight: 700; line-height: 1.3; margin-bottom: 20px;
}
.values-left p { color: var(--text-secondary); font-size: 1rem; line-height: 1.75; max-width: 380px; }
.values-list { display: flex; flex-direction: column; gap: 8px; }
.value-item {
  display: flex; gap: 18px; align-items: flex-start;
  padding: 22px 24px; border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: var(--transition);
}
.value-item:hover {
  background: rgba(40, 165, 255, 0.05);
  border-color: rgba(40, 165, 255, 0.2);
  transform: translateX(4px);
}
.value-icon {
  width: 44px; height: 44px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  border-radius: 12px;
  background: rgba(40, 165, 255, 0.1);
  border: 1px solid rgba(40, 165, 255, 0.2);
  color: var(--primary);
}
.value-icon.accent { background: rgba(0, 229, 204, 0.08); border-color: rgba(0, 229, 204, 0.2); color: var(--accent); }
.value-icon.warning { background: rgba(255, 159, 67, 0.08); border-color: rgba(255, 159, 67, 0.2); color: var(--warning); }
.value-icon svg { width: 20px; height: 20px; }
.value-body h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 6px; color: var(--text-primary); }
.value-body p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.65; }

/* ===== Services ===== */
.services {
  background: var(--bg-secondary);
  padding: var(--space-section) 0;
  overflow: hidden;
}
.services-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px;
  align-items: center; margin-bottom: 96px;
}
.services-row:last-child { margin-bottom: 0; }
.services-row.reverse .service-image { order: 2; }
.services-row.reverse .service-copy { order: 1; }
.service-image {
  border-radius: var(--radius-xl);
  overflow: hidden; position: relative;
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
}
.service-image img {
  width: 100%; height: auto; aspect-ratio: 4/3; object-fit: cover;
  transition: transform 0.6s ease;
}
.service-image:hover img { transform: scale(1.04); }
.service-image::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(40, 165, 255, 0.1), transparent 60%);
  pointer-events: none;
}
.service-image .image-tag {
  position: absolute; top: 16px; left: 16px; z-index: 2;
  background: rgba(7, 11, 20, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px; padding: 4px 14px;
  font-size: 0.75rem; color: var(--text-primary);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.service-copy h2 {
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  font-weight: 700; line-height: 1.3; margin-bottom: 18px;
  letter-spacing: -0.01em;
}
.service-copy > p { color: var(--text-secondary); margin-bottom: 24px; font-size: 1rem; }
.service-features { display: flex; flex-direction: column; gap: 14px; margin-bottom: 28px; }
.service-features li {
  display: flex; align-items: center; gap: 10px;
  color: var(--text-secondary); font-size: 0.95rem;
}
.service-features li svg { width: 18px; height: 18px; color: var(--accent); flex-shrink: 0; }

/* ===== Solutions ===== */
.solutions {
  background: var(--bg-primary);
  padding: var(--space-section) 0;
  overflow: hidden;
}
.solutions-scroll {
  display: flex; gap: 24px; overflow-x: auto;
  padding: 20px 24px 24px; margin: 0 -24px;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -ms-overflow-style: none;
  cursor: grab;
}
.solutions-scroll::-webkit-scrollbar { display: none; }
.solutions-scroll:active { cursor: grabbing; }
.solution-card {
  min-width: 340px; max-width: 340px; flex-shrink: 0;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 28px; scroll-snap-align: start;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.solution-card:hover {
  border-color: rgba(40, 165, 255, 0.3);
  background: rgba(40, 165, 255, 0.04);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.solution-card:nth-child(2n) { margin-top: 40px; }
.solution-card .sol-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: linear-gradient(135deg, rgba(40, 165, 255, 0.15), rgba(0, 229, 204, 0.08));
  border: 1px solid rgba(40, 165, 255, 0.2);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary); margin-bottom: 20px;
}
.solution-card .sol-icon svg { width: 22px; height: 22px; }
.solution-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 12px; color: var(--text-primary); }
.solution-card p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: 18px; }
.solution-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.solution-tags span {
  font-size: 0.72rem; color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 4px 10px; border-radius: 12px;
}
.scroll-fade {
  position: absolute; top: 0; right: 0; bottom: 0; width: 60px;
  background: linear-gradient(to left, var(--bg-primary), transparent);
  pointer-events: none; z-index: 3;
}

/* ===== Cases ===== */
.cases {
  background: var(--bg-secondary);
  padding: var(--space-section) 0;
}
.cases-grid {
  display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 32px;
  align-items: stretch;
}
.case-main {
  border-radius: var(--radius-xl);
  overflow: hidden; position: relative;
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-card);
  min-height: 420px;
  display: flex; align-items: flex-end;
}
.case-main img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; z-index: 0;
}
.case-main::before {
  content: ''; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(to top, rgba(7, 11, 20, 0.95) 0%, rgba(7, 11, 20, 0.4) 60%, transparent 100%);
}
.case-main-content {
  position: relative; z-index: 2; padding: 32px; width: 100%;
}
.case-main-content .case-tag {
  display: inline-block; font-size: 0.75rem; color: var(--accent);
  background: rgba(0, 229, 204, 0.1);
  border: 1px solid rgba(0, 229, 204, 0.2);
  padding: 4px 12px; border-radius: 12px; margin-bottom: 14px;
}
.case-main-content h3 { font-size: 1.35rem; font-weight: 700; margin-bottom: 10px; line-height: 1.4; }
.case-main-content p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 16px; max-width: 520px; }
.case-result-link { color: var(--primary); font-size: 0.875rem; font-weight: 500; }
.case-result-link:hover { color: var(--accent); }
.case-side {
  display: flex; flex-direction: column; gap: 24px;
}
.case-mini {
  flex: 1; border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 28px; transition: var(--transition);
  display: flex; flex-direction: column; justify-content: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}
.case-mini:hover { border-color: rgba(40, 165, 255, 0.25); transform: translateX(4px); }
.case-mini .big-num {
  font-family: var(--font-num);
  font-size: 2.4rem; font-weight: 800;
  color: var(--primary); line-height: 1.2; margin-bottom: 6px;
}
.case-mini .big-num em { font-style: normal; color: var(--accent); }
.case-mini h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 8px; color: var(--text-primary); }
.case-mini p { font-size: 0.85rem; color: var(--text-secondary); }

/* ===== News ===== */
.news {
  background: var(--bg-primary);
  padding: var(--space-section) 0;
}
.news-list { display: flex; flex-direction: column; gap: 16px; }
.news-item {
  display: flex; gap: 20px; align-items: center;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: 16px;
  transition: var(--transition);
}
.news-item:hover {
  border-color: rgba(40, 165, 255, 0.35);
  transform: translateX(4px);
  background: rgba(40, 165, 255, 0.03);
}
.news-thumb {
  width: 180px; height: 110px; border-radius: var(--radius-md);
  overflow: hidden; flex-shrink: 0; position: relative;
  background: var(--bg-secondary);
}
.news-thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s ease;
}
.news-item:hover .news-thumb img { transform: scale(1.05); }
.news-info { flex: 1; min-width: 0; }
.news-tag {
  display: inline-block; font-size: 0.72rem; color: var(--primary);
  background: rgba(40, 165, 255, 0.12);
  border: 1px solid rgba(40, 165, 255, 0.18);
  padding: 2px 10px; border-radius: 10px; margin-bottom: 8px;
  font-weight: 500;
}
.news-info h3 {
  font-size: 1.05rem; font-weight: 600; color: var(--text-primary);
  margin-bottom: 6px; line-height: 1.4;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.news-info h3:hover { color: var(--primary); }
.news-info p {
  font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; margin-bottom: 8px;
}
.news-time {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.75rem; color: var(--text-secondary); opacity: 0.8;
}
.news-time svg { width: 14px; height: 14px; }
.news-empty {
  border: 1px dashed rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  min-height: 200px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 14px; color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.015);
}
.news-empty .empty-icon {
  width: 56px; height: 56px; border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
  display: flex; align-items: center; justify-content: center;
  color: rgba(138, 148, 166, 0.5);
}
.news-empty .empty-icon svg { width: 24px; height: 24px; }
.news-empty p { font-size: 0.9rem; }

/* ===== Pricing ===== */
.pricing {
  background: var(--bg-secondary);
  padding: var(--space-section) 0;
}
.pricing-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
  align-items: stretch;
  margin-top: 64px;
}
.price-card {
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 36px 32px; position: relative;
  transition: var(--transition);
  display: flex; flex-direction: column;
}
.price-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); }
.price-card.featured {
  background: linear-gradient(180deg, rgba(40, 165, 255, 0.08), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(40, 165, 255, 0.35);
  box-shadow: 0 0 40px rgba(40, 165, 255, 0.12), var(--shadow-card);
  transform: scale(1.02);
  z-index: 2;
}
.price-card.featured:hover { transform: scale(1.02) translateY(-6px); box-shadow: 0 0 50px rgba(40, 165, 255, 0.2), var(--shadow-card); }
.price-badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(90deg, var(--accent), var(--primary));
  color: #05111F; font-size: 0.75rem; font-weight: 700;
  padding: 4px 18px; border-radius: 20px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(40, 165, 255, 0.3);
}
.price-name { font-size: 1rem; font-weight: 600; color: var(--text-primary); margin-bottom: 16px; }
.price-amount {
  font-family: var(--font-num);
  font-size: 2.25rem; font-weight: 800; color: var(--text-primary);
  line-height: 1.1; margin-bottom: 4px;
}
.price-amount .currency { font-size: 1.4rem; vertical-align: top; color: var(--text-secondary); font-weight: 700; }
.price-amount .period { font-size: 0.875rem; color: var(--text-secondary); font-weight: 400; }
.price-desc { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 24px; }
.price-features {
  display: flex; flex-direction: column; gap: 12px; flex: 1;
  margin-bottom: 28px;
}
.price-features li {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: 0.875rem; color: var(--text-secondary); line-height: 1.5;
}
.price-features li svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 3px; }
.price-features li.available svg { color: var(--primary); }
.price-features li.unavailable svg { color: rgba(138, 148, 166, 0.4); }
.price-card .btn { width: 100%; }

/* ===== FAQ ===== */
.faq {
  background: var(--bg-primary);
  padding: var(--space-section) 0;
}
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.06);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: rgba(40, 165, 255, 0.2); }
.faq-item.active { border-color: rgba(40, 165, 255, 0.3); background: rgba(40, 165, 255, 0.03); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 24px; cursor: pointer;
  font-size: 0.95rem; font-weight: 500; color: var(--text-primary);
  gap: 16px; user-select: none;
}
.faq-icon {
  width: 28px; height: 28px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: rgba(40, 165, 255, 0.1);
  color: var(--primary);
  transition: var(--transition);
}
.faq-icon svg { width: 14px; height: 14px; transition: transform 0.3s ease; }
.faq-item.active .faq-icon { background: var(--primary); color: #05111F; }
.faq-item.active .faq-icon svg { transform: rotate(45deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease, opacity 0.3s ease;
  opacity: 0;
}
.faq-item.active .faq-answer {
  max-height: 300px; opacity: 1;
}
.faq-answer-inner {
  padding: 0 24px 22px; font-size: 0.9rem;
  color: var(--text-secondary); line-height: 1.7;
}

/* ===== CTA ===== */
.cta-banner {
  padding: var(--space-section) 0;
  background: var(--bg-secondary);
  position: relative; overflow: hidden;
}
.cta-inner {
  background: linear-gradient(135deg, rgba(40, 165, 255, 0.15), rgba(0, 229, 204, 0.08));
  border: 1px solid rgba(40, 165, 255, 0.2);
  border-radius: var(--radius-xl);
  padding: 64px 48px; text-align: center;
  position: relative; overflow: hidden;
  box-shadow: 0 0 60px rgba(40, 165, 255, 0.08);
}
.cta-inner::before {
  content: ''; position: absolute; top: -60%; left: -30%;
  width: 70%; height: 220%;
  background: radial-gradient(circle, rgba(40, 165, 255, 0.2), transparent 60%);
  pointer-events: none;
}
.cta-inner::after {
  content: ''; position: absolute; bottom: -60%; right: -20%;
  width: 60%; height: 200%;
  background: radial-gradient(circle, rgba(0, 229, 204, 0.15), transparent 60%);
  pointer-events: none;
}
.cta-inner h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem); font-weight: 700;
  color: var(--text-primary); margin-bottom: 14px; position: relative; z-index: 2;
}
.cta-inner > p {
  color: var(--text-secondary); font-size: 1rem;
  max-width: 520px; margin: 0 auto 32px; position: relative; z-index: 2;
}
.cta-inner .btn { position: relative; z-index: 2; }

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-footer);
  border-top: 1px solid rgba(255, 255, 255, 0.03);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px;
  margin-bottom: 48px;
}
.footer-brand .brand { margin-bottom: 16px; }
.footer-brand p {
  color: var(--text-secondary); font-size: 0.875rem; line-height: 1.7;
  max-width: 300px; margin-bottom: 20px;
}
.footer-social { display: flex; gap: 12px; }
.footer-social a {
  width: 36px; height: 36px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--text-secondary); transition: var(--transition);
}
.footer-social a:hover { color: var(--primary); border-color: rgba(40, 165, 255, 0.3); background: rgba(40, 165, 255, 0.08); }
.footer-social a svg { width: 16px; height: 16px; }
.footer-col h4 {
  font-size: 0.95rem; font-weight: 600; color: var(--text-primary);
  margin-bottom: 18px; letter-spacing: 0.02em;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul a, .footer-col ul span {
  color: var(--text-secondary); font-size: 0.875rem;
  transition: var(--transition);
}
.footer-col ul a:hover { color: var(--primary); padding-left: 4px; }
.footer-contact li {
  display: flex; align-items: flex-start; gap: 10px;
  color: var(--text-secondary); font-size: 0.875rem;
  margin-bottom: 12px; line-height: 1.6;
}
.footer-contact li svg { width: 16px; height: 16px; flex-shrink: 0; color: var(--primary); margin-top: 3px; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding: 22px 0;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
}
.footer-bottom p { font-size: 0.75rem; color: rgba(138, 148, 166, 0.7); }
.footer-bottom .beian { color: rgba(138, 148, 166, 0.5); }

/* ===== Responsive ===== */
@media (max-width: 1200px) {
  .container { padding: 0 32px; }
  .solutions-scroll { margin: 0 -32px; padding: 20px 32px 24px; }
}
@media (max-width: 992px) {
  .nav-links { display: none; }
  .nav-right .nav-search, .nav-right .nav-auth, .nav-right .btn-nav { display: none; }
  .hamburger { display: flex; }
  .hero .container { grid-template-columns: 1fr; gap: 48px; }
  .hero { padding: 120px 0 60px; }
  .values-grid { grid-template-columns: 1fr; gap: 48px; }
  .values-left { position: static; }
  .services-row { grid-template-columns: 1fr; gap: 48px; }
  .services-row.reverse .service-image { order: 1; }
  .services-row.reverse .service-copy { order: 2; }
  .cases-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 480px; margin-left: auto; margin-right: auto; }
  .price-card.featured { transform: scale(1); }
  .price-card.featured:hover { transform: translateY(-4px); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px 0; }
  .stat-item { border-right: none; }
  .stat-item:nth-child(2n) { border-left: 1px solid rgba(255, 255, 255, 0.04); }
  .solutions-scroll { margin: 0 -20px; padding-left: 20px; padding-right: 20px; }
  .solution-card { min-width: 280px; max-width: 280px; }
  .news-item { flex-direction: column; align-items: flex-start; }
  .news-thumb { width: 100%; height: 180px; }
  .cta-inner { padding: 48px 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .case-main { min-height: 360px; }
}
@media (max-width: 576px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-ctas { flex-direction: column; }
  .hero-ctas .btn { width: 100%; }
  .price-card { padding: 32px 24px; }
  .case-main-content { padding: 24px; }
  .cta-inner { padding: 40px 20px; }
  .brand-name { font-size: 1rem; }
  .hero-visual-inner { border-radius: 20px; }
  .hero-float-tag { left: 10px; bottom: 12px; }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}

/* roulang page: category1 */
:root {
    --bg-primary: #070B14;
    --bg-secondary: #0D1420;
    --bg-footer: #05080F;
    --primary: #28A5FF;
    --primary-light: #4CB8FF;
    --secondary: #00E5CC;
    --accent: #FF9F43;
    --text-primary: #E7EDF5;
    --text-secondary: #8A94A6;
    --border: #1E293B;
    --glass-bg: rgba(255,255,255,0.045);
    --glass-border: rgba(255,255,255,0.09);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-card: 0 8px 32px rgba(0,0,0,0.35);
    --shadow-glow: 0 0 24px rgba(40,165,255,0.35);
    --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
    --font-number: 'Inter', 'Rajdhani', 'DIN Alternate', system-ui, sans-serif;
    --container-max: 1200px;
    --header-h: 72px;
    --section-space: clamp(4rem, 8vw, 7rem);
  }

  @supports not ((backdrop-filter: blur(16px)) or (-webkit-backdrop-filter: blur(16px))) {
    :root {
      --glass-bg: rgba(13,20,32,0.92);
    }
  }

  *,
  *::before,
  *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.75;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }

  img {
    max-width: 100%;
    display: block;
  }

  a {
    color: inherit;
    text-decoration: none;
  }

  button {
    font-family: inherit;
    cursor: pointer;
  }

  input {
    font-family: inherit;
  }

  ul,
  ol {
    list-style: none;
  }

  h1,
  h2,
  h3,
  h4 {
    line-height: 1.3;
    font-weight: 700;
    color: var(--text-primary);
  }

  h1 {
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    line-height: 1.2;
    letter-spacing: -0.01em;
  }

  h2 {
    font-size: clamp(1.8rem, 3.2vw, 2.4rem);
    line-height: 1.3;
  }

  h3 {
    font-size: 1.25rem;
    font-weight: 600;
  }

  p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.75;
  }

  .container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
  }

  .section {
    padding: var(--section-space) 0;
    position: relative;
  }

  .section-header {
    max-width: 640px;
    margin-bottom: 48px;
  }

  .section-header.center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
  }

  .section-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--secondary);
    background: rgba(0, 229, 204, 0.08);
    border: 1px solid rgba(0, 229, 204, 0.18);
    padding: 5px 14px;
    border-radius: 50px;
    margin-bottom: 16px;
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--primary);
    color: #07111f;
    font-size: 0.9rem;
    font-weight: 600;
    padding: 12px 28px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    box-shadow: 0 0 20px rgba(40, 165, 255, 0.35);
    transition: all 0.3s ease;
    text-decoration: none;
  }
  .btn-primary:hover {
    background: var(--primary-light);
    box-shadow: 0 0 28px rgba(40, 165, 255, 0.6);
    transform: translateY(-2px);
  }
  .btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 0 18px rgba(40, 165, 255, 0.4);
  }
  .btn-primary:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
  }

  .btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.06);
    color: var(--primary);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 12px 28px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: all 0.3s ease;
    text-decoration: none;
  }
  .btn-ghost:hover {
    border-color: var(--primary);
    background: rgba(40, 165, 255, 0.08);
    transform: translateY(-2px);
  }
  .btn-ghost:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
  }

  .btn-lg {
    padding: 14px 40px;
    font-size: 1rem;
  }

  /* ===== 导航栏 ===== */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--header-h);
    padding: 0;
    display: flex;
    align-items: center;
    background: transparent;
    transition: background 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
    border-bottom: 1px solid transparent;
  }
  .site-header.scrolled {
    background: rgba(7, 11, 20, 0.82);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom-color: var(--border);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  }

  .nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
    width: 100%;
  }

  .brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
  }
  .brand-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(40, 165, 255, 0.12);
    border: 1px solid rgba(40, 165, 255, 0.28);
    color: var(--primary);
    transition: box-shadow 0.3s;
  }
  .brand:hover .brand-icon {
    box-shadow: 0 0 18px rgba(40, 165, 255, 0.35);
  }
  .brand-icon svg {
    width: 22px;
    height: 22px;
  }
  .brand-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
  }

  .nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
  }
  .nav-links > a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 4px 0;
    position: relative;
    transition: color 0.3s;
    white-space: nowrap;
  }
  .nav-links > a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width 0.3s ease;
  }
  .nav-links > a:hover {
    color: var(--primary);
  }
  .nav-links > a:hover::after,
  .nav-links > a.active::after {
    width: 100%;
  }
  .nav-links > a.active {
    color: var(--text-primary);
  }

  .nav-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-shrink: 0;
  }

  .search-box {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    padding: 7px 16px;
    width: 160px;
    transition: width 0.3s ease, border-color 0.3s, box-shadow 0.3s;
  }
  .search-box:focus-within {
    width: 220px;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(40, 165, 255, 0.15);
  }
  .search-box svg {
    width: 15px;
    height: 15px;
    color: var(--text-secondary);
    flex-shrink: 0;
  }
  .search-box input {
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.85rem;
    width: 100%;
  }
  .search-box input::placeholder {
    color: var(--text-secondary);
  }

  .nav-login {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s;
  }
  .nav-login:hover {
    color: var(--primary);
  }

  .nav-cta {
    padding: 9px 22px;
    font-size: 0.85rem;
  }

  .nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 42px;
    height: 42px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    align-items: center;
    transition: background 0.3s;
  }
  .nav-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
  }
  .nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
  }
  .nav-toggle.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .mobile-actions {
    display: none;
  }

  /* ===== 分类首屏 ===== */
  .category-hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
    background-color: var(--bg-primary);
  }
  .category-hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
  }
  .category-hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  .category-hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    background: linear-gradient(180deg, rgba(7, 11, 20, 0.85) 0%, rgba(7, 11, 20, 0.62) 50%, var(--bg-primary) 96%);
  }
  .category-hero-inner {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 760px;
    margin: 0 auto;
  }
  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--secondary);
    background: rgba(0, 229, 204, 0.08);
    border: 1px solid rgba(0, 229, 204, 0.2);
    border-radius: 50px;
    padding: 6px 18px;
    margin-bottom: 20px;
  }
  .category-hero h1 {
    margin-bottom: 18px;
    background: linear-gradient(135deg, #FFFFFF 30%, var(--primary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
  .hero-subtitle {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 28px;
  }
  .hero-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-secondary);
  }
  .hero-meta .dot {
    width: 4px;
    height: 4px;
    background: var(--primary);
    border-radius: 50%;
  }

  /* ===== 分类介绍区 ===== */
  .intro-section {
    background: var(--bg-secondary);
  }
  .intro-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: clamp(24px, 5vw, 64px);
    align-items: center;
  }
  .intro-text p {
    margin-bottom: 16px;
  }
  .intro-list {
    margin-top: 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
  .intro-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
  }
  .intro-list li svg {
    width: 18px;
    height: 18px;
    color: var(--secondary);
    flex-shrink: 0;
    margin-top: 3px;
  }
  .intro-media {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--glass-border);
  }
  .intro-media img {
    width: 100%;
    height: 380px;
    object-fit: cover;
  }
  .intro-media::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(40, 165, 255, 0.12), transparent 60%);
    pointer-events: none;
  }

  /* ===== 内容卡片区 ===== */
  .cards-section {
    background: var(--bg-primary);
  }
  .cards-waterfall {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
  }
  .card-col {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }
  .card-col-right {
    margin-top: 60px;
  }
  .card-col-right .module-card:nth-child(2) {
    margin-top: 8px;
  }
  .module-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 26px;
    box-shadow: var(--shadow-card), inset 0 1px 0 rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: transform 0.35s ease, border-color 0.35s, box-shadow 0.35s;
    position: relative;
    overflow: hidden;
  }
  .module-card::before {
    content: "";
    position: absolute;
    top: -40px;
    right: -40px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(40, 165, 255, 0.1), transparent 70%);
    opacity: 0;
    transition: opacity 0.4s;
    pointer-events: none;
  }
  .module-card:hover {
    transform: translateY(-4px);
    border-color: rgba(40, 165, 255, 0.4);
    box-shadow: 0 14px 44px rgba(0, 0, 0, 0.42), 0 0 20px rgba(40, 165, 255, 0.08);
  }
  .module-card:hover::before {
    opacity: 1;
  }
  .module-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(40, 165, 255, 0.1);
    border: 1px solid rgba(40, 165, 255, 0.24);
    color: var(--primary);
    margin-bottom: 18px;
  }
  .module-icon svg {
    width: 22px;
    height: 22px;
  }
  .module-card h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
  }
  .module-card p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
  }
  .module-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }
  .module-tags span {
    display: inline-flex;
    align-items: center;
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    color: var(--primary);
    background: rgba(40, 165, 255, 0.08);
    border: 1px solid rgba(40, 165, 255, 0.16);
    border-radius: 50px;
    padding: 4px 14px;
  }

  /* ===== 实施流程 ===== */
  .flow-section {
    background: var(--bg-secondary);
  }
  .flow-timeline {
    position: relative;
    max-width: 720px;
    margin: 0 auto;
    padding-left: 34px;
    border-left: 2px solid rgba(40, 165, 255, 0.2);
  }
  .flow-step {
    position: relative;
    padding-bottom: 44px;
  }
  .flow-step:last-child {
    padding-bottom: 0;
  }
  .flow-step::before {
    content: "";
    position: absolute;
    left: -40px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 14px rgba(40, 165, 255, 0.6);
  }
  .flow-step::after {
    content: "";
    position: absolute;
    left: -34px;
    top: 22px;
    width: 2px;
    height: calc(100% - 16px);
    background: rgba(40, 165, 255, 0.08);
    z-index: -1;
  }
  .flow-step:last-child::after {
    display: none;
  }
  .flow-step .step-num {
    font-family: var(--font-number);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--secondary);
    margin-bottom: 6px;
  }
  .flow-step h3 {
    font-size: 1.15rem;
    margin-bottom: 8px;
  }
  .flow-step p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.7;
  }

  /* ===== FAQ ===== */
  .faq-section {
    background: var(--bg-primary);
  }
  .faq-list {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
  }
  .faq-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
    transition: border-color 0.3s;
  }
  .faq-item.open {
    border-color: rgba(40, 165, 255, 0.3);
  }
  .faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 22px;
    background: none;
    border: none;
    text-align: left;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: color 0.3s;
  }
  .faq-question:hover {
    color: var(--primary);
  }
  .faq-question:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: -2px;
    border-radius: var(--radius-md);
  }
  .faq-icon {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    border-radius: 50%;
    background: rgba(40, 165, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    transition: transform 0.35s ease, background 0.3s;
    font-weight: 300;
    font-size: 1.1rem;
    position: relative;
  }
  .faq-icon::before {
    content: "+";
    line-height: 1;
  }
  .faq-item.open .faq-icon {
    transform: rotate(45deg);
    background: rgba(40, 165, 255, 0.2);
  }
  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s;
    padding: 0 22px;
    font-size: 0.9rem;
    line-height: 1.75;
    color: var(--text-secondary);
  }
  .faq-item.open .faq-answer {
    max-height: 300px;
    padding: 0 22px 20px;
  }

  /* ===== CTA ===== */
  .cta-section {
    position: relative;
    background: var(--bg-secondary);
    overflow: hidden;
    padding: clamp(4rem, 7vw, 6rem) 0;
  }
  .cta-section::before,
  .cta-section::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
  }
  .cta-section::before {
    width: 420px;
    height: 420px;
    background: rgba(40, 165, 255, 0.18);
    top: -160px;
    left: -80px;
  }
  .cta-section::after {
    width: 360px;
    height: 360px;
    background: rgba(0, 229, 204, 0.12);
    bottom: -160px;
    right: -60px;
  }
  .cta-inner {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 640px;
    margin: 0 auto;
  }
  .cta-inner h2 {
    margin-bottom: 14px;
  }
  .cta-inner p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 0.95rem;
  }

  /* ===== 页脚 ===== */
  .site-footer {
    background: var(--bg-footer);
    border-top: 1px solid #0d1621;
    padding: 64px 0 0;
  }
  .footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
    gap: 32px;
    padding-bottom: 48px;
  }
  .footer-brand .brand {
    margin-bottom: 16px;
  }
  .footer-brand p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
    max-width: 360px;
  }
  .footer-social {
    display: flex;
    gap: 10px;
  }
  .footer-social a {
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    transition: all 0.3s;
  }
  .footer-social a:hover {
    color: var(--primary);
    border-color: rgba(40, 165, 255, 0.4);
    background: rgba(40, 165, 255, 0.08);
    transform: translateY(-2px);
  }
  .footer-social svg {
    width: 16px;
    height: 16px;
  }
  .footer-col h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
  }
  .footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  .footer-col ul a {
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: color 0.3s;
  }
  .footer-col ul a:hover {
    color: var(--primary);
  }
  .footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.875rem;
    color: var(--text-secondary);
  }
  .footer-contact svg {
    width: 16px;
    height: 16px;
    color: var(--secondary);
    flex-shrink: 0;
    margin-top: 3px;
  }
  .footer-bottom {
    border-top: 1px solid #0d1621;
    padding: 20px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
  }
  .footer-bottom p {
    font-size: 0.75rem;
    color: #5a6478;
  }
  .footer-bottom .site-domain {
    font-family: var(--font-number);
    letter-spacing: 0.02em;
  }

  /* ===== 响应式 ===== */
  @media (max-width: 991px) {
    .nav-actions {
      display: none;
    }
    .nav-toggle {
      display: flex;
    }
    .nav-links {
      position: fixed;
      top: var(--header-h);
      left: 0;
      right: 0;
      z-index: 99;
      flex-direction: column;
      align-items: stretch;
      gap: 16px;
      padding: 28px 24px 32px;
      background: rgba(7, 11, 20, 0.97);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border);
      box-shadow: 0 18px 40px rgba(0, 0, 0, 0.5);
      transform: translateY(-12px);
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease, transform 0.3s ease;
    }
    .nav-links.open {
      opacity: 1;
      transform: translateY(0);
      pointer-events: auto;
    }
    .nav-links > a {
      font-size: 1rem;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    }
    .nav-links > a::after {
      bottom: 6px;
    }
    .mobile-actions {
      display: flex;
      flex-direction: column;
      gap: 14px;
      padding-top: 18px;
      margin-top: 6px;
    }
    .mobile-actions .search-box {
      width: 100%;
    }
    .mobile-actions .search-box:focus-within {
      width: 100%;
    }
    .mobile-actions .btn-primary {
      justify-content: center;
    }
    .mobile-actions .nav-login {
      text-align: center;
    }

    .footer-grid {
      grid-template-columns: 1fr 1fr;
    }
    .footer-brand {
      grid-column: 1 / -1;
    }
  }

  @media (max-width: 767px) {
    .category-hero {
      min-height: 440px;
      padding: 100px 0 60px;
    }
    .hero-subtitle {
      font-size: 0.95rem;
    }
    .intro-grid {
      grid-template-columns: 1fr;
      gap: 32px;
    }
    .intro-list {
      grid-template-columns: 1fr;
    }
    .intro-media img {
      height: 260px;
    }
    .cards-waterfall {
      grid-template-columns: 1fr;
      gap: 20px;
    }
    .card-col-right {
      margin-top: 0;
    }
    .card-col-right .module-card:nth-child(2) {
      margin-top: 0;
    }
    .footer-grid {
      grid-template-columns: 1fr;
      gap: 28px;
    }
    .footer-brand {
      grid-column: auto;
    }
    .footer-bottom {
      flex-direction: column;
      justify-content: center;
      text-align: center;
    }
    .cta-section {
      padding: 3rem 0;
    }
    .faq-question {
      font-size: 0.88rem;
      padding: 16px 16px;
    }
    .faq-answer,
    .faq-item.open .faq-answer {
      padding-left: 16px;
      padding-right: 16px;
    }
  }

  @media (max-width: 575px) {
    .container {
      padding: 0 18px;
    }
    .brand-name {
      font-size: 1rem;
    }
    .brand-icon {
      width: 34px;
      height: 34px;
    }
    .section-header {
      margin-bottom: 32px;
    }
    .module-card {
      padding: 22px;
      border-radius: 16px;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    * {
      animation-duration: 0.01ms !important;
      transition-duration: 0.01ms !important;
    }
  }

/* roulang page: article */
:root {
  --bg-primary: #070B14;
  --bg-secondary: #0D1420;
  --bg-footer: #05080F;
  --primary: #28A5FF;
  --accent: #00E5CC;
  --orange: #FF9F43;
  --text-primary: #E7EDF5;
  --text-secondary: #8A94A6;
  --border-color: #1E293B;
  --glass-bg: rgba(255, 255, 255, 0.045);
  --glass-border: rgba(255, 255, 255, 0.09);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 24px rgba(40, 165, 255, 0.35);
  --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
  --font-num: 'Inter', 'Rajdhani', var(--font-family);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 1rem;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; border: none; outline: none; }
ul, ol { list-style: none; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 10px;
  padding: 12px 28px;
  transition: all 0.25s ease;
  cursor: pointer;
  line-height: 1.2;
  border: 1px solid transparent;
  text-align: center;
}
.btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.btn-primary {
  background: var(--primary);
  color: #070B14;
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover {
  background: #4CB8FF;
  box-shadow: 0 0 28px rgba(40, 165, 255, 0.6);
  transform: translateY(-2px);
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 0 12px rgba(40, 165, 255, 0.3);
}
.btn-outline {
  background: rgba(13, 20, 32, 0.92);
  background: var(--glass-bg);
  border-color: var(--glass-border);
  color: var(--primary);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(40, 165, 255, 0.08);
  transform: translateY(-2px);
}
.btn-nav {
  padding: 10px 20px;
  font-size: 0.9rem;
}

/* ===== 导航 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
}
.site-header.scrolled {
  background: rgba(7, 11, 20, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  flex-shrink: 0;
}
.brand-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  background: rgba(40, 165, 255, 0.1);
  border-radius: 10px;
  border: 1px solid rgba(40, 165, 255, 0.2);
}
.brand-icon svg { width: 22px; height: 22px; }
.brand-name {
  background: linear-gradient(135deg, #E7EDF5 40%, #28A5FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links > a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: 8px 2px;
  transition: color 0.2s;
  white-space: nowrap;
}
.nav-links > a::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  transition: width 0.3s;
}
.nav-links > a:hover { color: var(--primary); }
.nav-links > a:hover::after,
.nav-links > a.active::after { width: 100%; }
.nav-links > a.active { color: var(--text-primary); }

.mobile-search {
  display: none;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
  width: 100%;
}
.mobile-search input {
  width: 100%;
  padding: 10px 18px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  color: var(--text-primary);
  font-size: 0.875rem;
}
.mobile-search input::placeholder { color: var(--text-secondary); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 160px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: width 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.search-box:focus-within {
  width: 220px;
  border-color: rgba(40, 165, 255, 0.5);
  box-shadow: 0 0 12px rgba(40, 165, 255, 0.15);
}
.search-box svg {
  width: 16px;
  height: 16px;
  color: var(--text-secondary);
  flex-shrink: 0;
}
.search-box input {
  background: none;
  color: var(--text-primary);
  font-size: 0.875rem;
  width: 100%;
}
.search-box input::placeholder { color: var(--text-secondary); }
.nav-login {
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: color 0.2s;
  white-space: nowrap;
}
.nav-login:hover { color: var(--primary); }
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--glass-border);
  flex-direction: column;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  margin: 3px 0;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* ===== 文章头图 ===== */
.article-main {
  padding-top: 76px;
  min-height: 70vh;
}
.article-hero {
  position: relative;
  height: 400px;
  overflow: hidden;
  background: var(--bg-secondary);
}
.article-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
}
.article-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 11, 20, 0.55) 0%, rgba(7, 11, 20, 0.15) 35%, rgba(7, 11, 20, 0.6) 75%, #070B14 100%);
  pointer-events: none;
}

/* ===== 文章头部 ===== */
.article-header {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 24px 0;
}
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}
.breadcrumb a {
  color: var(--text-secondary);
  transition: color 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb-sep { color: var(--border-color); }
.article-header h1 {
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-bottom: 24px;
  color: var(--text-primary);
}
.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.meta-item svg {
  width: 15px;
  height: 15px;
  color: var(--primary);
  opacity: 0.8;
}
.meta-divider { color: var(--border-color); }
.meta-category {
  display: inline-flex;
  align-items: center;
  padding: 3px 12px;
  background: rgba(40, 165, 255, 0.12);
  border: 1px solid rgba(40, 165, 255, 0.2);
  border-radius: 999px;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 500;
  margin-left: 4px;
}

/* ===== 正文容器 ===== */
.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 24px 0;
}
.article-content-wrap {
  max-width: 760px;
  margin: 0 auto;
}

/* ===== 文章正文排版 ===== */
.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-primary);
}
.article-body > * + * { margin-top: 1rem; }
.article-body p { margin: 16px 0; }
.article-body h2 {
  font-size: 1.55rem;
  font-weight: 700;
  margin: 44px 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  line-height: 1.4;
}
.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 36px 0 14px;
  line-height: 1.45;
}
.article-body a {
  color: var(--primary);
  border-bottom: 1px dashed var(--primary);
  transition: border-color 0.2s, color 0.2s;
}
.article-body a:hover {
  border-bottom-style: solid;
  color: var(--accent);
}
.article-body blockquote {
  border-left: 3px solid var(--primary);
  background: rgba(40, 165, 255, 0.06);
  padding: 18px 24px;
  margin: 28px 0;
  border-radius: 0 14px 14px 0;
  color: var(--text-secondary);
  font-style: normal;
}
.article-body blockquote p { margin: 0; }
.article-body ul,
.article-body ol {
  margin: 16px 0;
  padding-left: 28px;
}
.article-body ul li {
  list-style: disc;
  margin: 8px 0;
}
.article-body ol li {
  list-style: decimal;
  margin: 8px 0;
}
.article-body img {
  border-radius: 14px;
  margin: 28px 0;
  box-shadow: var(--shadow-card);
}
.article-body figure {
  margin: 28px 0;
}
.article-body figure img { margin: 0; }
.article-body figcaption {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 10px;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.9rem;
}
.article-body th,
.article-body td {
  border: 1px solid var(--border-color);
  padding: 12px 16px;
  text-align: left;
}
.article-body th {
  background: var(--bg-secondary);
  font-weight: 600;
}
.article-body pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.7;
}
.article-body code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  font-size: 0.9em;
  color: var(--accent);
  background: rgba(0, 229, 204, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
}
.article-body pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
}
.article-body hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 40px 0;
}

/* ===== 标签 ===== */
.article-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}
.section-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}
.tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  background: rgba(40, 165, 255, 0.08);
  border: 1px solid rgba(40, 165, 255, 0.18);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--primary);
  white-space: nowrap;
  transition: all 0.2s;
}
.tag:hover {
  background: rgba(40, 165, 255, 0.16);
  border-color: rgba(40, 165, 255, 0.4);
  transform: translateY(-1px);
}

/* ===== 相关推荐 ===== */
.related-section {
  padding: 80px 0;
  background: var(--bg-secondary);
  margin-top: 64px;
}
.related-section .container {
  max-width: 1200px;
}
.related-section h2 {
  font-size: clamp(1.6rem, 3vw, 2rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
}
.related-desc {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.925rem;
  margin-bottom: 48px;
}
.related-grid {
  display: grid;
  grid-template-columns: 1fr 1.22fr 1fr;
  gap: 24px;
  align-items: start;
}
.related-card {
  display: block;
  background: rgba(13, 20, 32, 0.92);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.3s ease;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  position: relative;
}
.related-card:hover {
  border-color: rgba(40, 165, 255, 0.4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}
.related-card img {
  width: 100%;
  height: 170px;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.related-card:hover img {
  transform: scale(1.03);
}
.related-body {
  padding: 22px;
}
.related-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 10px;
  color: var(--text-primary);
  transition: color 0.2s;
}
.related-card:hover .related-body h3 {
  color: var(--primary);
}
.related-body p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.related-card.related-center {
  margin-top: -28px;
  border-color: rgba(40, 165, 255, 0.25);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

/* ===== 返回入口 ===== */
.article-back-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}
.article-back {
  max-width: 760px;
  margin: 0 auto;
}
.article-back a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color 0.2s;
  position: relative;
  padding-bottom: 4px;
}
.article-back a svg {
  width: 16px;
  height: 16px;
  transition: transform 0.2s;
}
.article-back a:hover {
  color: var(--primary);
}
.article-back a:hover svg {
  transform: translateX(-3px);
}
.article-back a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  opacity: 0;
  transition: opacity 0.2s;
}
.article-back a:hover::after { opacity: 1; }

/* ===== 内容未找到 ===== */
.article-not-found {
  text-align: center;
  padding: 80px 24px;
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.02);
}
.not-found-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  color: var(--text-secondary);
  border: 2px dashed rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.not-found-icon svg {
  width: 32px;
  height: 32px;
}
.article-not-found h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.article-not-found p {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg-footer);
  padding: 80px 0 32px;
  border-top: 1px solid var(--border-color);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 64px;
}
.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 16px 0 24px;
  max-width: 340px;
  line-height: 1.7;
}
.footer-social {
  display: flex;
  gap: 12px;
}
.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.2s;
}
.footer-social a:hover {
  color: var(--primary);
  border-color: rgba(40, 165, 255, 0.4);
  transform: translateY(-2px);
}
.footer-social svg {
  width: 18px;
  height: 18px;
}
.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-primary);
}
.footer-col ul li {
  margin-bottom: 12px;
}
.footer-col ul a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.footer-col ul a:hover {
  color: var(--primary);
}
.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}
.footer-contact svg {
  width: 16px;
  height: 16px;
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 3px;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
  .nav-links {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: rgba(7, 11, 20, 0.97);
    flex-direction: column;
    align-items: stretch;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-130%);
    transition: transform 0.3s ease;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 99;
    max-height: calc(100vh - 76px);
    overflow-y: auto;
  }
  .nav-links.open {
    transform: translateY(0);
  }
  .mobile-search {
    display: block;
  }
  .nav-toggle {
    display: flex;
  }
  .nav-actions .search-box,
  .nav-login {
    display: none;
  }
  .related-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .related-card.related-center {
    margin-top: 0;
    grid-column: 1 / -1;
  }
  .related-center img {
    height: 220px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 64px;
  }
  .article-main {
    padding-top: 64px;
  }
  .nav-links {
    top: 64px;
  }
  .btn-nav {
    display: none;
  }
  .article-hero {
    height: 300px;
  }
  .article-header {
    padding-top: 32px;
  }
  .related-section {
    padding: 56px 0;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .related-card.related-center {
    grid-column: auto;
  }
  .related-center img,
  .related-card img {
    height: 180px;
  }
  .site-footer {
    padding: 56px 0 24px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    justify-content: center;
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 18px;
  }
  .hero-heading {
    font-size: 2rem;
  }
  .article-hero {
    height: 220px;
  }
  .article-header h1 {
    font-size: 1.6rem;
  }
  .article-meta {
    gap: 8px;
    font-size: 0.8rem;
  }
  .meta-divider {
    margin: 0 2px;
  }
  .article-container,
  .article-header {
    padding-left: 18px;
    padding-right: 18px;
  }
  .article-body {
    font-size: 1rem;
    line-height: 1.8;
  }
  .article-tags {
    gap: 8px;
  }
  .tag {
    padding: 5px 12px;
    font-size: 0.75rem;
  }
  .related-section h2 {
    font-size: 1.5rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    margin-bottom: 40px;
  }
  .footer-bottom {
    padding-top: 24px;
  }
}