/* ===== 南宫导航 - 智能商业解决方案 ===== */
/* 视觉风格：野兽派 + 解构网格 + 高饱和配色 */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;500;700;900&display=swap');

:root {
  --bg-primary: #0d0a08;
  --bg-secondary: #1a1410;
  --text-primary: #f5ede6;
  --text-secondary: #b8a99a;
  --accent-1: #ff3d00;
  --accent-2: #ffbb00;
  --accent-3: #00e5ff;
  --accent-4: #9d4edd;
  --grid-color: rgba(255, 61, 0, 0.08);
  --card-bg: rgba(26, 20, 16, 0.85);
  --border-thick: 4px solid var(--accent-1);
  --shadow-hard: 8px 8px 0px rgba(255, 61, 0, 0.3);
  --font-sans: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-smooth: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.4;
  overflow-x: hidden;
}

/* ===== 全局背景纹理 ===== */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(45deg, var(--grid-color) 1px, transparent 1px),
    linear-gradient(-45deg, var(--grid-color) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ===== 容器 ===== */
.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 40px;
  position: relative;
  z-index: 1;
}

/* ===== 头部 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 10, 8, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--accent-1);
}

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

.logo {
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo::before {
  content: '◆';
  color: var(--accent-1);
  font-size: 2rem;
  display: inline-block;
  animation: pulse-rotate 3s infinite;
}

@keyframes pulse-rotate {
  0%, 100% { transform: rotate(0deg) scale(1); }
  50% { transform: rotate(180deg) scale(1.2); }
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.main-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  position: relative;
  padding: 4px 0;
  transition: var(--transition-fast);
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-1);
  transition: var(--transition-smooth);
}

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

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

.nav-cta {
  background: var(--accent-1);
  color: var(--bg-primary) !important;
  padding: 8px 24px !important;
  border-radius: 0;
  font-weight: 700 !important;
  clip-path: polygon(0 0, 100% 0, 95% 100%, 0 100%);
  transition: var(--transition-fast);
}

.nav-cta:hover {
  background: var(--accent-2) !important;
  color: var(--bg-primary) !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-hard);
}

.nav-cta::after {
  display: none !important;
}

.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: 3px;
  background: var(--text-primary);
  transition: var(--transition-fast);
}

/* ===== Hero ===== */
.hero {
  min-height: 85vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 80px 0 60px;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -80px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 61, 0, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent-1);
  background: rgba(255, 61, 0, 0.12);
  padding: 6px 16px;
  margin-bottom: 24px;
  border-left: var(--border-thick);
  animation: fade-in-up 0.6s ease-out;
}

.hero h1 {
  font-size: clamp(2.8rem, 6vw, 5.2rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
  color: var(--text-primary);
  text-transform: uppercase;
}

.hero h1 span {
  color: var(--accent-1);
  display: block;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 520px;
  margin-bottom: 36px;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.hero-image {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image::after {
  content: '◈';
  font-size: 20rem;
  color: var(--accent-1);
  opacity: 0.15;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-30px) rotate(10deg); }
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 36px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition-fast);
  position: relative;
}

.btn-primary {
  background: var(--accent-1);
  color: var(--bg-primary);
  clip-path: polygon(0 0, 100% 0, 95% 100%, 0 100%);
}

.btn-primary:hover {
  background: var(--accent-2);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hard);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--text-primary);
}

.btn-outline:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
  transform: translateY(-3px);
}

/* ===== 通用区块 ===== */
.section {
  padding: 100px 0;
  position: relative;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent-1);
  background: rgba(255, 61, 0, 0.1);
  padding: 4px 14px;
  margin-bottom: 20px;
  border-left: 3px solid var(--accent-1);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  color: var(--text-primary);
  text-transform: uppercase;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

/* ===== 卡片网格 ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 60px;
}

.category-card {
  background: var(--card-bg);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 40px 32px;
  transition: var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: var(--accent-1);
  transition: var(--transition-smooth);
}

.category-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent-1);
  box-shadow: var(--shadow-hard);
}

.category-card:hover::before {
  height: 100%;
}

.card-icon {
  font-size: 2.8rem;
  margin-bottom: 20px;
  display: block;
  color: var(--accent-1);
}

.category-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.category-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  color: var(--accent-1);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: var(--transition-fast);
}

.card-link:hover {
  gap: 14px;
  color: var(--accent-2);
}

/* ===== 特色区块 ===== */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-top: 60px;
}

.feature-image {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-4));
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 6rem;
  color: var(--bg-primary);
  clip-path: polygon(0 0, 100% 0, 95% 100%, 0 95%);
  position: relative;
}

.feature-image::after {
  content: '';
  position: absolute;
  inset: 8px;
  border: 2px solid var(--bg-primary);
  clip-path: polygon(0 0, 100% 0, 95% 100%, 0 95%);
  opacity: 0.3;
}

.feature-text h3 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.feature-text p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

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

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

.feature-list li::before {
  content: '▸';
  color: var(--accent-1);
  font-weight: 700;
}

/* ===== 数据统计 ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin: 60px 0;
  padding: 48px 32px;
  background: var(--bg-secondary);
  border-top: 2px solid var(--accent-1);
  border-bottom: 2px solid var(--accent-1);
}

.stat-item {
  text-align: center;
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -16px;
  top: 10%;
  height: 80%;
  width: 1px;
  background: rgba(255, 255, 255, 0.08);
}

.stat-number {
  font-size: 3rem;
  font-weight: 900;
  color: var(--accent-1);
  line-height: 1;
  letter-spacing: -0.03em;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 8px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ===== 内容墙 ===== */
.content-wall {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 60px;
}

.content-wall-item {
  background: var(--card-bg);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0;
  overflow: hidden;
  transition: var(--transition-fast);
}

.content-wall-item:hover {
  transform: scale(1.02);
  border-color: var(--accent-3);
}

.content-wall-item img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
  background: linear-gradient(45deg, var(--accent-4), var(--accent-3));
}

.content-wall-body {
  padding: 24px;
}

.content-wall-body h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.content-wall-body p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ===== FAQ ===== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 40px;
  max-width: 800px;
}

.faq-item {
  background: var(--bg-secondary);
  border-left: 3px solid var(--accent-1);
  padding: 20px 28px;
  cursor: pointer;
  transition: var(--transition-fast);
}

.faq-item:hover {
  background: rgba(255, 61, 0, 0.06);
}

.faq-item h4 {
  font-size: 1.05rem;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item h4::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--accent-1);
  transition: var(--transition-fast);
}

.faq-item.active h4::after {
  content: '−';
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: var(--transition-smooth);
  color: var(--text-secondary);
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 200px;
  padding-top: 16px;
}

/* ===== CTA ===== */
.cta-banner {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-4));
  padding: 80px 60px;
  margin: 80px 0;
  clip-path: polygon(0 0, 100% 0, 98% 100%, 0 95%);
  text-align: center;
  position: relative;
}

.cta-banner h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 900;
  color: var(--bg-primary);
  text-transform: uppercase;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.cta-banner p {
  color: rgba(13, 10, 8, 0.8);
  font-size: 1.1rem;
  max-width: 500px;
  margin: 0 auto 32px;
}

.cta-banner .btn-primary {
  background: var(--bg-primary);
  color: var(--accent-1);
}

.cta-banner .btn-primary:hover {
  background: var(--accent-2);
  color: var(--bg-primary);
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 2px solid var(--accent-1);
  padding: 80px 0 0;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}

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

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-1);
  margin-bottom: 20px;
}

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

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

.footer-col a:hover {
  color: var(--text-primary);
  padding-left: 6px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ===== 辅助类 ===== */
.text-accent {
  color: var(--accent-1);
}

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

.seo-description {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

/* ===== 动画 ===== */
@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero p {
    margin: 0 auto 36px;
  }
  .hero-buttons {
    justify-content: center;
  }
  .hero-image {
    display: none;
  }
  .feature-block {
    grid-template-columns: 1fr;
  }
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-item:not(:last-child)::after {
    display: none;
  }
  .content-wall {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 2px solid var(--accent-1);
  }

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

  .menu-toggle {
    display: flex;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

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

  .stats-bar {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding: 32px 16px;
  }

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

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

  .cta-banner {
    padding: 48px 24px;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero {
    min-height: auto;
    padding: 40px 0;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .section {
    padding: 60px 0;
  }

  .stats-bar {
    grid-template-columns: 1fr;
  }

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