/* ============================================
   Clash Verge for Linux — Linux 橙色主题
   基于 Ubuntu/Debian/Fedora/Arch 设计语言
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
  /* Linux 橙色系 */
  --primary: #E95420;
  --primary-dark: #C7411A;
  --primary-light: #FF6B35;
  --primary-rgb: 233,84,32;

  --secondary: #F39C12;
  --secondary-dark: #D68910;
  --secondary-light: #F5B041;

  --accent-1: #FF6B35;      /* 热力橙 */
  --accent-2: #E95420;      /* Ubuntu橙 */
  --accent-3: #F39C12;      /* 金黄 */
  --accent-4: #DD4814;      /* 深橙红 */
  --accent-5: #77216F;      /* Ubuntu紫(点缀) */

  --gradient-start: #FF6B35;
  --gradient-mid1: #E95420;
  --gradient-mid2: #F39C12;
  --gradient-end: #DD4814;

  --text-primary: #2c3e50;
  --text-secondary: #546e7a;
  --text-light: #78909c;
  --text-white: #ffffff;
  --text-muted: #90a4ae;

  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #eceff1;
  --bg-card: #ffffff;
  --bg-code: #1e272e;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.14);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.18);

  /* 圆角 - Linux 更硬朗一点 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 999px;

  /* 过渡 */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);

  /* 布局 */
  --max-width: 1180px;
  --header-height: 72px;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-height); }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'Ubuntu', 'Roboto', sans-serif;
  color: var(--text-primary);
  background: var(--bg-secondary);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition-fast); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

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

/* ---------- Header ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transition: var(--transition);
}
.header.scrolled { background: rgba(255,255,255,0.98); box-shadow: var(--shadow-sm); }
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--text-primary);
  text-decoration: none !important;
}
.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid2));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: white;
  box-shadow: 0 3px 12px rgba(var(--primary-rgb), 0.35);
}
.logo span { background: linear-gradient(135deg, var(--gradient-mid1), var(--gradient-mid2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  position: relative;
}
.nav a:hover,
.nav a.active { color: var(--primary); background: rgba(var(--primary-rgb), 0.07); }

.nav-cta {
  padding: 9px 22px !important;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid1)) !important;
  color: white !important;
  border-radius: var(--radius-full) !important;
  font-weight: 600 !important;
  box-shadow: 0 3px 12px rgba(var(--primary-rgb), 0.3);
}
.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 5px 18px rgba(var(--primary-rgb), 0.4) !important;
  color: white !important;
}

.menu-toggle { display: none; cursor: pointer; padding: 8px; border-radius: var(--radius-sm); }
.menu-toggle span { display: block; width: 22px; height: 2px; background: var(--text-primary); margin: 4px 0; border-radius: 2px; transition: var(--transition); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 140px 0 80px;
  background: linear-gradient(160deg, #FFF8F3 0%, #fff5ee 40%, #fef3ec 70%, #fff0e5 100%);
  overflow: hidden;
  min-height: 85vh;
  display: flex;
  align-items: center;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 900px;
  height: 900px;
  background: radial-gradient(circle, rgba(var(--primary-rgb), 0.08) 0%, transparent 65%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(243,156,18, 0.07) 0%, transparent 65%);
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  background: rgba(var(--primary-rgb), 0.08);
  border: 1px solid rgba(var(--primary-rgb), 0.15);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 20px;
}
.hero-badge svg { width: 16px; height: 16px; stroke: currentColor; }
.hero h1 {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid1), var(--gradient-mid2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.18rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 36px;
  max-width: 520px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 15px 34px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid1));
  color: white;
  border-radius: var(--radius-full);
  font-size: 1.02rem;
  font-weight: 700;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 18px rgba(var(--primary-rgb), 0.35);
  text-decoration: none !important;
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(var(--primary-rgb), 0.45);
  color: white;
}
.btn-primary svg { width: 20px; height: 20px; }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 15px 34px;
  background: white;
  color: var(--text-primary);
  border: 2px solid #e0e0e0;
  border-radius: var(--radius-full);
  font-size: 1.02rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none !important;
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}
.btn-outline svg { width: 20px; height: 20px; }

.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 44px;
  padding-top: 32px;
  border-top: 1px solid rgba(0,0,0,0.07);
}
.stat-item { text-align: left; }
.stat-num { font-size: 1.7rem; font-weight: 900; color: var(--primary); }
.stat-label { font-size: 0.83rem; color: var(--text-light); font-weight: 500; margin-top: 2px; }

/* Hero 右侧终端预览 */
.hero-preview {
  position: relative;
  perspective: 1000px;
}
.terminal-window {
  background: var(--bg-code);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl), 0 0 60px rgba(var(--primary-rgb), 0.12);
  transform: rotateY(-4deg) rotateX(2deg);
  transition: var(--transition);
}
.terminal-window:hover {
  transform: rotateY(0deg) rotateX(0deg);
}
.terminal-header {
  display: flex;
  align-items: center;
  padding: 14px 18px;
  background: #2d3748;
  gap: 8px;
}
.terminal-dot { width: 13px; height: 13px; border-radius: 50%; }
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27ca40; }
.terminal-title {
  margin-left: 12px;
  color: #a0aec0;
  font-size: 0.82rem;
  font-family: 'Ubuntu Mono', 'Fira Code', monospace;
}
.terminal-body {
  padding: 24px;
  font-family: 'Ubuntu Mono', 'Fira Code', monospace;
  font-size: 0.85rem;
  line-height: 1.85;
  min-height: 300px;
  color: #e2e8f0;
}
.terminal-line { opacity: 0; animation: terminalType 0.05s forwards; }
.terminal-line:nth-child(1) { animation-delay: 0.1s; }
.terminal-line:nth-child(2) { animation-delay: 0.3s; }
.terminal-line:nth-child(3) { animation-delay: 0.5s; }
.terminal-line:nth-child(4) { animation-delay: 0.7s; }
.terminal-line:nth-child(5) { animation-delay: 0.9s; }
.terminal-line:nth-child(6) { animation-delay: 1.1s; }
.terminal-line:nth-child(7) { animation-delay: 1.3s; }
@keyframes terminalType { to { opacity: 1; } }
.prompt { color: var(--secondary-light); }
.cmd { color: #68d391; }
.flag { color: #f6ad55; }
.output { color: #a0aec0; }
.success { color: #68d391; }
.error { color: #fc8181; }
.path { color: #63b3ed; }
.cursor-blink {
  display: inline-block;
  width: 8px;
  height: 17px;
  background: var(--secondary-light);
  animation: blink 1s infinite;
  vertical-align: middle;
  margin-left: 2px;
}
@keyframes blink { 0%,50%{opacity:1} 51%,100%{opacity:0} }

/* Hero 浮动装饰 */
.hero-float {
  position: absolute;
  right: -10px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 16px;
  z-index: 2;
}
.float-tag {
  background: white;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  animation: float 4s ease-in-out infinite;
  border: 1px solid rgba(0,0,0,0.04);
}
.float-tag:nth-child(2) { animation-delay: -1.3s; }
.float-tag:nth-child(3) { animation-delay: -2.6s; }
.float-icon { font-size: 1.2rem; }
@keyframes float {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(-10px); }
}

/* ---------- Section 通用 ---------- */
.section { padding: 96px 0; }
.section-header { text-align: center; max-width: 660px; margin: 0 auto 64px; }
.section-tag {
  display: inline-block;
  padding: 5px 16px;
  background: rgba(var(--primary-rgb), 0.07);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-header h2 { font-size: 2.5rem; font-weight: 900; letter-spacing: -0.025em; margin-bottom: 16px; }
.section-header p { font-size: 1.1rem; color: var(--text-secondary); line-height: 1.7; }

/* ---------- Features Grid ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 26px;
}
.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  border: 1px solid #f0f0f0;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-mid2));
  transform: scaleX(0);
  transition: transform 0.3s ease;
  transform-origin: left;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.feature-card:hover::before { transform: scaleX(1); }

.feature-icon {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.09), rgba(243,156,18, 0.09));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.55rem;
  margin-bottom: 22px;
}
.feature-card h3 { font-size: 1.22rem; font-weight: 800; margin-bottom: 12px; color: var(--text-primary); }
.feature-card p { font-size: 0.94rem; color: var(--text-secondary); line-height: 1.7; }

/* ---------- Stats Bar ---------- */
.stats-bar {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid1), var(--gradient-mid2));
  padding: 56px 0;
  position: relative;
  overflow: hidden;
}
.stats-bar::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
  z-index: 1;
}
.stat-box { text-align: center; color: white; }
.stat-big { font-size: 2.6rem; font-weight: 900; line-height: 1.1; margin-bottom: 6px; }
.stat-info { font-size: 0.88rem; opacity: 0.9; font-weight: 500; }

/* ---------- Sysreq Box (Linux发行版需求) ---------- */
.sysreq-section { padding: 80px 0 72px; background: var(--bg-primary); }
.sysreq-box {
  background: linear-gradient(135deg, #fafafa, #f5f5f5);
  border: 1px solid #e8e8e8;
  border-radius: var(--radius-xl);
  padding: 48px 52px;
  max-width: 920px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}
.sysreq-box::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-mid1), var(--gradient-mid2));
}
.sysreq-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
}
.sysreq-title-icon { font-size: 1.6rem; }
.sysreq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
}
.sysreq-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.sysreq-item-icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  border-radius: var(--radius-sm);
  background: rgba(var(--primary-rgb), 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}
.sysreq-item h4 { font-size: 0.88rem; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.sysreq-item p { font-size: 0.82rem; color: var(--text-light); line-height: 1.5; }

/* 发行版徽章组 */
.distros-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid #e0e0e0;
}
.distro-badge {
  padding: 7px 18px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  border: 1.5px solid #ddd;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  background: white;
}
.distro-badge:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(var(--primary-rgb), 0.04);
}

/* ---------- FAQ ---------- */
.faq-section { padding: 96px 0; background: var(--bg-secondary); }
.faq-list { max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid #eee;
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: rgba(var(--primary-rgb), 0.2); box-shadow: var(--shadow-sm); }
.faq-question {
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  gap: 16px;
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--text-primary);
  transition: var(--transition-fast);
}
.faq-question:hover { color: var(--primary); }
.faq-icon {
  width: 28px;
  height: 28px;
  min-width: 28px;
  border-radius: 50%;
  background: rgba(var(--primary-rgb), 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: var(--transition);
  color: var(--primary);
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: var(--primary);
  color: white;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}
.faq-answer-inner {
  padding: 0 28px 24px;
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.8;
}
.faq-answer-inner a { color: var(--primary); font-weight: 600; }
.faq-answer-inner code {
  background: #f5f5f5;
  padding: 2px 8px;
  border-radius: 4px;
  font-family: 'Ubuntu Mono', 'Fira Code', monospace;
  font-size: 0.87em;
  color: var(--primary-dark);
}
.faq-answer-inner ul { list-style: disc; padding-left: 20px; margin: 10px 0; }
.faq-answer-inner li { margin-bottom: 6px; }

/* ---------- CTA ---------- */
.cta-section {
  padding: 96px 0;
  background: linear-gradient(160deg, #FFF8F3 0%, #fff5ee 50%, #fef3ec 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(var(--primary-rgb), 0.06) 0%, transparent 70%);
  pointer-events: none;
}
.cta-section .section-header { position: relative; z-index: 1; margin-bottom: 42px; }
.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; position: relative; z-index: 1; }

/* ---------- Friend Links ---------- */
.friend-section { padding: 64px 0 80px; }
.friend-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  max-width: 800px;
  margin: 0 auto;
}
.friend-link {
  padding: 9px 22px;
  background: var(--bg-card);
  border: 1px solid #e8e8e8;
  border-radius: var(--radius-full);
  font-size: 0.86rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition-fast);
}
.friend-link:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(var(--primary-rgb), 0.04);
  transform: translateY(-2px);
}

/* ---------- Footer ---------- */
.footer {
  background: #1a1a2e;
  color: #b8c5d6;
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand .logo { color: white; margin-bottom: 14px; }
.footer-brand .logo span { background: linear-gradient(135deg, var(--secondary-light), var(--gradient-start)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.footer-brand p { font-size: 0.91rem; line-height: 1.7; opacity: 0.75; max-width: 320px; }
.footer-col h4 { color: white; font-size: 1rem; font-weight: 700; margin-bottom: 20px; }
.footer-col a { display: block; color: #b8c5d6; font-size: 0.89rem; padding: 6px 0; transition: var(--transition-fast); }
.footer-col a:hover { color: var(--secondary-light); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  opacity: 0.65;
}
.footer-bottom a { color: inherit; }

/* ---------- Download Page ---------- */
.page-hero {
  padding: 130px 0 64px;
  background: linear-gradient(160deg, #FFF8F3 0%, #fff5ee 50%, #fef3ec 100%);
  text-align: center;
  position: relative;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(var(--primary-rgb), 0.06) 0%, transparent 65%);
  pointer-events: none;
}
.page-hero h1 { font-size: 2.8rem; font-weight: 900; margin-bottom: 16px; position: relative; }
.page-hero p { font-size: 1.12rem; color: var(--text-secondary); max-width: 580px; margin: 0 auto; position: relative; }

.download-platforms { display: flex; flex-direction: column; gap: 36px; max-width: 900px; margin: 0 auto 64px; }
.platform-group { background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid #eee; overflow: hidden; }
.platform-header {
  padding: 24px 32px;
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.04), rgba(243,156,18, 0.04));
  border-bottom: 1px solid #f0f0f0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.platform-name { font-size: 1.2rem; font-weight: 800; color: var(--text-primary); display: flex; align-items: center; gap: 10px; }
.platform-name-icon { font-size: 1.4rem; }
.platform-desc { font-size: 0.88rem; color: var(--text-light); }
.platform-files { padding: 24px 32px; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.file-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border: 2px solid #e8e8e8;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none !important;
  color: var(--text-primary);
}
.file-btn:hover {
  border-color: var(--primary);
  background: rgba(var(--primary-rgb), 0.04);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.file-icon { font-size: 1.4rem; }
.file-info { flex: 1; }
.file-type { font-weight: 700; font-size: 0.95rem; }
.file-meta { font-size: 0.79rem; color: var(--text-light); margin-top: 2px; }
.file-arrow { color: var(--text-light); font-size: 1.1rem; transition: var(--transition-fast); }
.file-btn:hover .file-arrow { color: var(--primary); transform: translateX(3px); }

/* 版本对比表 */
.compare-table-wrapper { overflow-x: auto; margin: 48px 0; }
.compare-table { width: 100%; border-collapse: collapse; background: var(--bg-card); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm); }
.compare-table th {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid1));
  color: white;
  padding: 16px 20px;
  text-align: left;
  font-weight: 700;
  font-size: 0.92rem;
  white-space: nowrap;
}
.compare-table td { padding: 14px 20px; border-bottom: 1px solid #f0f0f0; font-size: 0.91rem; color: var(--text-secondary); }
.compare-table tr:last-child td { border-bottom: none; }
.compare-table tr:hover td { background: rgba(var(--primary-rgb), 0.02); }
.badge-recommended {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(var(--primary-rgb), 0.1);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 0.76rem;
  font-weight: 700;
}

/* 安装指南 */
.install-guide { max-width: 820px; margin: 0 auto; }
.install-steps { counter-reset: step; }
.install-step {
  display: flex;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid #f0f0f0;
}
.install-step:last-child { border-bottom: none; }
.step-number {
  width: 44px;
  height: 44px;
  min-width: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid1));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.1rem;
}
.step-content h4 { font-size: 1.08rem; font-weight: 800; margin-bottom: 8px; color: var(--text-primary); }
.step-content p { font-size: 0.93rem; color: var(--text-secondary); line-height: 1.75; }
.step-content code {
  display: inline-block;
  background: var(--bg-code);
  color: #68d391;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-family: 'Ubuntu Mono', 'Fira Code', monospace;
  font-size: 0.85rem;
  margin-top: 10px;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ---------- Features Page ---------- */
.features-detail { padding: 80px 0; }
.feature-detail-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid #eee;
  padding: 52px 44px;
  margin-bottom: 36px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  transition: var(--transition);
}
.feature-detail-card:hover { box-shadow: var(--shadow-md); border-color: rgba(var(--primary-rgb), 0.15); }
.feature-detail-card:nth-child(even) .feature-detail-visual { order: -1; }
.feature-detail-icon {
  width: 66px;
  height: 66px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), rgba(243,156,18, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 20px;
}
.feature-detail-content h3 { font-size: 1.5rem; font-weight: 900; margin-bottom: 16px; color: var(--text-primary); }
.feature-detail-content p { font-size: 0.97rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 20px; }
.feature-list { list-style: none; }
.feature-list li {
  padding: 8px 0;
  font-size: 0.92rem;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.feature-list li::before {
  content: '✓';
  color: var(--primary);
  font-weight: 900;
  flex-shrink: 0;
  margin-top: 1px;
}
.feature-detail-visual {
  background: linear-gradient(135deg, #fafafa, #f5f5f5);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 260px;
  font-size: 3.5rem;
  border: 1px dashed #ddd;
}

/* 特性网格 */
.sub-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 56px; }
.sub-feature-card {
  background: var(--bg-card);
  border: 1px solid #eee;
  border-radius: var(--radius-md);
  padding: 30px 24px;
  text-align: center;
  transition: var(--transition);
}
.sub-feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.sub-feature-icon { font-size: 2.2rem; margin-bottom: 14px; }
.sub-feature-card h4 { font-size: 1.02rem; font-weight: 800; margin-bottom: 8px; }
.sub-feature-card p { font-size: 0.86rem; color: var(--text-light); }

/* 对比表格 */
.compare-table-features { margin: 56px 0; }

/* ---------- About Page ---------- */
.about-intro { padding: 80px 0 64px; }
.about-content { display: grid; grid-template-columns: 1.2fr 1fr; gap: 56px; align-items: flex-start; }
.about-text h2 { font-size: 2.2rem; font-weight: 900; margin-bottom: 20px; }
.about-text > p { font-size: 1.03rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }
.about-visual {
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.06), rgba(243,156,18,0.06));
  border-radius: var(--radius-xl);
  padding: 48px;
  text-align: center;
  border: 1px solid rgba(var(--primary-rgb), 0.1);
  position: sticky;
  top: calc(var(--header-height) + 24px);
}
.about-emoji { font-size: 5rem; margin-bottom: 20px; display: inline-block; }
.about-visual h3 { font-size: 1.5rem; font-weight: 900; color: var(--primary); margin-bottom: 10px; }

/* 编号特性 */
.numbered-features { display: flex; flex-direction: column; gap: 24px; margin: 56px 0; }
.num-feature {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid #eee;
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
}
.num-feature:hover { box-shadow: var(--shadow-md); border-color: rgba(var(--primary-rgb), 0.15); }
.num-badge {
  width: 52px;
  height: 52px;
  min-width: 52px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid1));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.3rem;
}
.num-feature h4 { font-size: 1.1rem; font-weight: 800; margin-bottom: 8px; color: var(--text-primary); }
.num-feature p { font-size: 0.92rem; color: var(--text-secondary); line-height: 1.7; }

/* 技术架构表 */
.arch-table { margin: 48px 0; }
.arch-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.arch-card {
  background: var(--bg-card);
  border: 1px solid #eee;
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: center;
}
.arch-icon { font-size: 2rem; margin-bottom: 12px; }
.arch-card h4 { font-size: 1rem; font-weight: 800; margin-bottom: 8px; }
.arch-card p { font-size: 0.84rem; color: var(--text-light); }

/* 快速上手 */
.quickstart-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin: 48px 0; }
.qs-step { text-align: center; }
.qs-num {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid1));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.3rem;
  margin: 0 auto 18px;
}
.qs-step h4 { font-size: 1.05rem; font-weight: 800; margin-bottom: 10px; }
.qs-step p { font-size: 0.89rem; color: var(--text-secondary); line-height: 1.7; }

/* 致谢 & License */
.thanks-section { padding: 64px 0; background: var(--bg-secondary); }
.license-section { padding: 64px 0 80px; }
.license-box {
  max-width: 720px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid #eee;
  border-radius: var(--radius-lg);
  padding: 36px;
  font-size: 0.89rem;
  color: var(--text-secondary);
  line-height: 1.8;
}
.license-box h3 { color: var(--text-primary); margin-bottom: 16px; font-size: 1.15rem; }

/* ---------- Reveal Animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid1));
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: var(--transition);
  z-index: 99;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); box-shadow: var(--shadow-xl); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-desc { margin: 0 auto 36px; max-width: 520px; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-preview { max-width: 560px; margin: 40px auto 0; }
  .terminal-window { transform: none; }
  .hero-float { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .about-content { grid-template-columns: 1fr; }
  .about-visual { position: static; }
  .feature-detail-card { grid-template-columns: 1fr; }
  .feature-detail-card:nth-child(even) .feature-detail-visual { order: 0; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .sub-features { grid-template-columns: repeat(2, 1fr); }
  .quickstart-steps { grid-template-columns: 1fr; max-width: 400px; margin-left: auto; margin-right: auto; }
}

@media (max-width: 768px) {
  :root { --header-height: 64px; }
  .menu-toggle { display: block; }
  .nav { 
    position: fixed; top: var(--header-height); left: 0; right: 0;
    background: white; flex-direction: column; padding: 20px;
    box-shadow: var(--shadow-lg); transform: translateY(-120%);
    transition: var(--transition);
    z-index: 999;
    border-bottom-left-radius: var(--radius-lg);
    border-bottom-right-radius: var(--radius-lg);
    gap: 4px;
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 14px 20px; width: 100%; text-align: center; }
  .nav-cta { margin-top: 10px; text-align: center; }
  
  .hero { padding: 120px 0 60px; min-height: auto; }
  .hero h1 { font-size: 2.3rem; }
  .hero-desc { font-size: 1.02rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn-primary, .btn-outline { width: 100%; max-width: 280px; justify-content: center; }
  .hero-stats { flex-direction: column; gap: 20px; align-items: center; }
  
  .terminal-body { font-size: 0.76rem; padding: 18px; min-height: 220px; }
  
  .section { padding: 64px 0; }
  .section-header h2 { font-size: 1.9rem; }
  .section-header p { font-size: 0.98rem; }
  
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .stat-big { font-size: 2rem; }
  
  .sysreq-box { padding: 28px 20px; }
  .sysreq-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  
  .platform-files { grid-template-columns: 1fr; }
  
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  
  .sub-features { grid-template-columns: 1fr; }
  .install-step { flex-direction: column; gap: 14px; }
  .arch-grid { grid-template-columns: 1fr 1fr; }
  .num-feature { flex-direction: column; text-align: center; align-items: center; }
  .distros-row { justify-content: center; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.85rem; }
  .stat-num { font-size: 1.4rem; }
  .features-grid { grid-template-columns: 1fr; }
  .page-hero h1 { font-size: 2rem; }
  .sysreq-grid { grid-template-columns: 1fr; }
}