/* 亿万国际 - 专属CSS设计系统 */
/* 风格：野兽派+玻璃态+大胆排版 */

:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a2e;
  --bg-glass: rgba(255, 255, 255, 0.06);
  --bg-glass-hover: rgba(255, 255, 255, 0.12);
  --text-primary: #f5f5f5;
  --text-secondary: #b0b0c0;
  --text-muted: #6a6a7a;
  --accent: #ff3d00;
  --accent2: #ff6d00;
  --accent-glow: rgba(255, 61, 0, 0.4);
  --border-glass: rgba(255, 255, 255, 0.12);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.6);
  --font-display: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --radius: 4px;
  --radius-lg: 12px;
  --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 容器 */
.container {
  max-width: 1360px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 头部 — 野兽派玻璃 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--border-glass);
  transition: background var(--transition);
}

.site-header:hover {
  background: rgba(10, 10, 10, 0.92);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 16px;
}

.logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.8rem;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
}

.logo::after {
  content: "™";
  font-size: 0.5rem;
  vertical-align: super;
  color: var(--accent);
  margin-left: 2px;
}

.logo span {
  color: var(--accent);
  background: var(--accent-glow);
  padding: 0 6px;
  border-radius: var(--radius);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.main-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  position: relative;
  padding: 8px 0;
  transition: color var(--transition);
}

.main-nav a::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

.main-nav a:hover {
  color: var(--text-primary);
}

.main-nav a:hover::before {
  width: 100%;
}

.nav-cta {
  background: var(--accent);
  color: #000 !important;
  padding: 8px 20px !important;
  border-radius: var(--radius);
  font-weight: 700 !important;
  letter-spacing: 0.04em;
  transition: all var(--transition);
  border: 1px solid var(--accent);
}

.nav-cta:hover {
  background: transparent;
  color: var(--accent) !important;
  border-color: var(--accent);
  box-shadow: 0 0 24px var(--accent-glow);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 28px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition);
  border-radius: 2px;
}

/* Hero — 野兽派构图 */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -10%;
  width: 70vmax;
  height: 70vmax;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0.3;
  pointer-events: none;
  animation: heroPulse 6s ease-in-out infinite alternate;
}

@keyframes heroPulse {
  0% { transform: scale(1) translate(0, 0); opacity: 0.2; }
  100% { transform: scale(1.2) translate(-40px, 40px); opacity: 0.5; }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 820px;
  text-align: center;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 6px 18px;
  border-radius: 100px;
  margin-bottom: 24px;
  background: var(--bg-glass);
  backdrop-filter: blur(4px);
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.8rem, 12vw, 6.5rem);
  line-height: 0.92;
  letter-spacing: -0.06em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 24px;
  text-shadow: 4px 4px 0 var(--accent), 8px 8px 0 rgba(0,0,0,0.3);
  transition: text-shadow 0.3s;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
  font-weight: 300;
  line-height: 1.5;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.hero-image {
  margin-top: 48px;
  max-width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,0.7);
  border: 1px solid var(--border-glass);
  transition: transform var(--transition), box-shadow var(--transition);
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  padding: 20px;
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

.hero-image:hover {
  transform: scale(1.01) translateY(-4px);
  box-shadow: 0 30px 80px rgba(255, 61, 0, 0.15);
}

/* 按钮 — 野兽派粗粝感 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 36px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  background: transparent;
  color: var(--accent);
  box-shadow: 0 0 40px var(--accent-glow), inset 0 0 20px rgba(255,61,0,0.1);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-glass);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg-glass-hover);
  transform: translateY(-2px);
}

/* 通用区块 */
.section {
  padding: 100px 24px;
  position: relative;
}

.section-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  border-left: 4px solid var(--accent);
  padding-left: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 3.8rem);
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 48px;
  font-weight: 300;
}

/* 卡片网格 — 玻璃态野兽派 */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.category-card {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 40px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.category-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.category-card:hover {
  background: var(--bg-glass-hover);
  border-color: var(--accent);
  transform: translateY(-8px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.category-card:hover::after {
  transform: scaleX(1);
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
  background: var(--accent-glow);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--accent);
  transition: all var(--transition);
}

.category-card:hover .card-icon {
  background: var(--accent);
  color: #000;
  box-shadow: 0 0 32px var(--accent-glow);
}

.category-card h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.category-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.card-link {
  display: inline-block;
  margin-top: 20px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  transition: all var(--transition);
  border-bottom: 1px solid transparent;
}

.card-link:hover {
  border-bottom-color: var(--accent);
  gap: 8px;
}

/* 特性块 — 杂志风 */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 80px 0;
  border-bottom: 1px solid var(--border-glass);
}

.feature-block:last-child {
  border-bottom: none;
}

.feature-image {
  background: var(--bg-glass);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-glass);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: all var(--transition);
  backdrop-filter: blur(4px);
  overflow: hidden;
  position: relative;
}

.feature-image::before {
  content: "✦";
  font-size: 4rem;
  color: var(--accent);
  opacity: 0.3;
}

.feature-image:hover {
  border-color: var(--accent);
  box-shadow: 0 0 48px var(--accent-glow);
}

.feature-text h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2rem;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.feature-text p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-size: 1rem;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.feature-list li::before {
  content: "→";
  color: var(--accent);
  font-weight: 700;
}

/* 统计栏 — 粗野主义 */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 32px;
  padding: 64px 24px;
  border-top: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  margin: 40px 0;
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
}

.stat-item {
  text-align: center;
  padding: 16px;
}

.stat-number {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 3.5rem;
  line-height: 1;
  color: var(--text-primary);
  letter-spacing: -0.04em;
  display: block;
  margin-bottom: 8px;
  text-shadow: 2px 2px 0 var(--accent);
}

.stat-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  font-weight: 500;
}

/* 内容墙 — 解构网格 */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.content-wall-item {
  background: var(--bg-primary);
  padding: 40px 28px;
  transition: all var(--transition);
  position: relative;
  border: 1px solid transparent;
}

.content-wall-item:hover {
  background: var(--bg-glass-hover);
  border-color: var(--accent);
  z-index: 2;
  box-shadow: 0 0 40px rgba(255,61,0,0.1);
}

.content-wall-body h4 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.content-wall-body p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* FAQ — 极简玻璃 */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-item {
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 20px 28px;
  cursor: pointer;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: var(--accent);
  background: var(--bg-glass-hover);
}

.faq-item summary {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-primary);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--accent);
  transition: transform var(--transition);
}

.faq-item[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-answer {
  padding-top: 16px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* CTA横幅 */
.cta-banner {
  background: linear-gradient(135deg, var(--accent) 0%, #b0003a 100%);
  border-radius: var(--radius-lg);
  padding: 64px 48px;
  text-align: center;
  margin: 80px 0;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 60px var(--accent-glow);
}

.cta-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 20px,
    rgba(255,255,255,0.03) 20px,
    rgba(255,255,255,0.03) 40px
  );
  pointer-events: none;
}

.cta-banner h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.8rem, 5vw, 3rem);
  color: #000;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.cta-banner p {
  color: rgba(0,0,0,0.7);
  max-width: 500px;
  margin: 0 auto 32px;
  font-size: 1.1rem;
  position: relative;
  z-index: 1;
}

.cta-banner .btn {
  background: #000;
  color: var(--accent);
  border-color: #000;
  position: relative;
  z-index: 1;
}

.cta-banner .btn:hover {
  background: transparent;
  color: #000;
  border-color: #000;
}

/* 页脚 — 野兽派分层 */
.site-footer {
  background: var(--bg-secondary);
  border-top: 2px solid var(--accent);
  padding: 80px 24px 32px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  max-width: 1360px;
  margin: 0 auto;
}

.footer-brand .logo {
  margin-bottom: 20px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  max-width: 300px;
}

.footer-col h4 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-bottom {
  text-align: center;
  padding-top: 48px;
  margin-top: 48px;
  border-top: 1px solid var(--border-glass);
  color: var(--text-muted);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

/* 辅助类 */
.text-accent {
  color: var(--accent);
}

.text-center {
  text-align: center;
}

.seo-description {
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 800px;
  margin: 40px auto;
  line-height: 1.7;
  padding: 24px;
  border-left: 4px solid var(--accent);
  background: var(--bg-glass);
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* 响应式 */
@media (max-width: 1024px) {
  .feature-block {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    flex-direction: column;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(24px);
    padding: 24px 32px;
    gap: 16px;
    border-bottom: 1px solid var(--border-glass);
  }

  .main-nav.active {
    display: flex;
  }

  .menu-toggle {
    display: flex;
  }

  .hero h1 {
    font-size: clamp(2.2rem, 10vw, 4rem);
    text-shadow: 2px 2px 0 var(--accent), 4px 4px 0 rgba(0,0,0,0.3);
  }

  .stats-bar {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    padding: 40px 16px;
  }

  .stat-number {
    font-size: 2.5rem;
  }

  .content-wall {
    grid-template-columns: 1fr;
  }

  .cta-banner {
    padding: 40px 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-brand p {
    max-width: 100%;
  }

  .section {
    padding: 60px 16px;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .header-inner {
    height: 60px;
  }

  .logo {
    font-size: 1.4rem;
  }

  .hero {
    padding: 100px 16px 60px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    padding: 12px 24px;
    font-size: 0.85rem;
  }

  .stat-item {
    padding: 8px;
  }

  .stat-number {
    font-size: 2rem;
  }

  .feature-block {
    padding: 40px 0;
  }

  .feature-text h3 {
    font-size: 1.5rem;
  }

  .section-title {
    font-size: 1.8rem;
  }
}

/* 滚动条定制 */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 100px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent2);
}

/* 选中文本 */
::selection {
  background: var(--accent);
  color: #000;
}