/* ===========================================
   甘肃仲安建筑安装工程有限责任公司
   AI 智能平台 — 官网样式
   设计风格: 深色科技 · 玻璃拟态 · 粒子动效
   =========================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

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

:root {
  --bg-deep: #0a0e1a;
  --bg-card: rgba(15, 23, 42, 0.8);
  --bg-card-hover: rgba(30, 41, 59, 0.9);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-glass: rgba(255, 255, 255, 0.06);
  --border-active: rgba(96, 165, 250, 0.3);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --primary: #3b82f6;
  --primary-light: #60a5fa;
  --primary-dark: #1d4ed8;
  --accent: #818cf8;
  --accent-2: #a78bfa;
  --fire: #ef4444;
  --shield: #3b82f6;
  --cyan: #06b6d4;
  --green: #10b981;
  --orange: #f59e0b;
  --purple: #8b5cf6;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ========== 粒子背景 ========== */
#particleCanvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}
.bg-gradient {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59, 130, 246, 0.08), transparent),
    radial-gradient(ellipse 60% 50% at 80% 80%, rgba(139, 92, 246, 0.06), transparent);
  z-index: 0;
  pointer-events: none;
}

/* ========== 导航栏 ========== */
.navbar {
  position: fixed; top: 0; left: 0; width: 100%;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-glass);
  padding: 10px 0;
}
.navbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
}
.logo-icon { display: flex; align-items: center; }
.brand-divider { color: var(--text-muted); font-weight: 300; }
.brand-sub {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 0.85rem;
  font-weight: 500;
}
.navbar-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.navbar-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}
.navbar-links a:hover { color: var(--text); }
.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: var(--transition);
}
.navbar-links a:hover::after { width: 100%; }
.btn-nav {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: white !important;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: var(--transition);
}
.btn-nav:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
}
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.6rem;
  cursor: pointer;
}

/* ========== 主横幅 ========== */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
}
.hero-inner { max-width: 960px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-glass);
  border: 1px solid var(--border-active);
  padding: 12px 32px;
  border-radius: 50px;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--primary-light);
  margin-bottom: 28px;
}
.badge-dot {
  width: 10px; height: 10px;
  background: var(--primary-light);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero-title-line { display: block; }
.hero-title-lg {
  display: block;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--text);
  text-shadow: 0 0 40px rgba(59, 130, 246, 0.3);
}
.hero-title-sm {
  display: block;
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-top: 6px;
}
.gradient-text {
  background: linear-gradient(135deg, var(--primary-light), var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--text-dim);
  line-height: 1.8;
  margin-bottom: 36px;
}
.hero-highlight {
  color: var(--primary-light);
  font-weight: 600;
}
.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
}
.btn-glow {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  box-shadow: 0 4px 24px rgba(59, 130, 246, 0.3);
}
.btn-glow:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(59, 130, 246, 0.5);
}
.btn-outline {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text);
}
.btn-outline:hover {
  border-color: var(--primary-light);
  background: rgba(59, 130, 246, 0.08);
}
.btn-shine {
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  animation: shine 3s infinite;
}
@keyframes shine {
  0% { left: -100%; }
  50%, 100% { left: 100%; }
}

.hero-stats {
  display: flex;
  gap: 40px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-stat {
  text-align: center;
  padding: 0 24px;
  border-right: 1px solid rgba(255,255,255,0.08);
}
.hero-stat:last-child { border-right: none; }
.hero-stat .num {
  font-size: 2.4rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary-light), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-stat .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.scroll-hint {
  position: absolute;
  bottom: 30px;
  color: var(--text-muted);
  font-size: 0.8rem;
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}

/* ========== 通用区块 ========== */
.section {
  position: relative;
  z-index: 1;
  padding: 100px 24px;
}
.section-alt {
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(10px);
}
.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-label {
  font-size: 0.75rem;
  color: var(--primary-light);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 12px;
  font-weight: 600;
}
.section-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 12px;
}
.section-header p {
  color: var(--text-dim);
  font-size: 1rem;
}

/* ========== 业务卡片网格 ========== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}
.card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
  overflow: hidden;
  cursor: default;
}
.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.card-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  opacity: 0;
  transition: opacity 0.6s;
  pointer-events: none;
}
.card:hover .card-glow { opacity: 0.06; }
.card-glow.fire { background: radial-gradient(circle, var(--fire), transparent 60%); }
.card-glow.shield { background: radial-gradient(circle, var(--shield), transparent 60%); }
.card-glow.cyan { background: radial-gradient(circle, var(--cyan), transparent 60%); }
.card-glow.green { background: radial-gradient(circle, var(--green), transparent 60%); }
.card-glow.orange { background: radial-gradient(circle, var(--orange), transparent 60%); }
.card-glow.purple { background: radial-gradient(circle, var(--purple), transparent 60%); }
.card-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  transition: var(--transition);
}
.card:hover .card-icon { transform: scale(1.1); }
.card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.card p {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.6;
}
.card-tags {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.card-tags span {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  padding: 3px 10px;
  border-radius: 14px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ========== 技术实力 ========== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}
.tech-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: var(--transition);
}
.tech-card:hover {
  border-color: var(--border-active);
  transform: translateY(-2px);
}
.tech-card.highlight {
  border-color: rgba(139, 92, 246, 0.3);
  background: rgba(139, 92, 246, 0.05);
}
.tech-icon { font-size: 2rem; margin-bottom: 10px; }
.tech-info h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 4px; }
.tech-info p { font-size: 0.8rem; color: var(--text-muted); }

/* ========== 知识库 AI 终端 ========== */
.kb-demo {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}
.kb-terminal {
  background: rgba(10, 14, 26, 0.95);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
}
.kb-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: rgba(30, 41, 59, 0.6);
  border-bottom: 1px solid var(--border-glass);
}
.kb-dots { display: flex; gap: 6px; }
.kb-dots .dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }
.kb-title { font-size: 0.85rem; color: var(--text-dim); font-weight: 500; }
.kb-messages {
  min-height: 300px;
  max-height: 400px;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.kb-messages::-webkit-scrollbar { width: 4px; }
.kb-messages::-webkit-scrollbar-track { background: transparent; }
.kb-messages::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }
.kb-msg {
  display: flex;
  gap: 10px;
  animation: slideUp 0.3s ease;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.kb-msg.user { flex-direction: row-reverse; }
.kb-avatar {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.kb-msg.user .kb-avatar {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border: none;
}
.kb-bubble {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.88rem;
  line-height: 1.6;
  max-width: 80%;
}
.kb-msg.user .kb-bubble {
  background: rgba(59, 130, 246, 0.15);
  border-color: rgba(59, 130, 246, 0.2);
}
.kb-bubble strong { color: var(--primary-light); }
.kb-bubble em { color: var(--text-muted); font-style: italic; }
.kb-input-area {
  display: flex;
  padding: 12px;
  border-top: 1px solid var(--border-glass);
  gap: 8px;
}
.kb-input {
  flex: 1;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}
.kb-input:focus { border-color: var(--primary); }
.kb-input::placeholder { color: var(--text-muted); }
.kb-send {
  width: 44px; height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.kb-send:hover { transform: scale(1.05); box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4); }
.kb-features h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
}
.kb-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.kb-tags span {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.78rem;
  color: var(--text-dim);
  transition: var(--transition);
}
.kb-tags span:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  cursor: pointer;
}

/* ========== AI 能力矩阵 ========== */
.ai-capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}
.ai-cap-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 16px;
  padding: 28px 24px;
  transition: var(--transition);
  text-align: center;
}
.ai-cap-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.ai-cap-icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
}
.ai-cap-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.ai-cap-card p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.6;
}
.ai-cap-card p strong {
  color: var(--primary-light);
}

/* ========== 知识库领域分组 ========== */
.kb-domains {
  margin-top: 40px;
}
.kb-domains h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text);
}
.domain-group {
  margin-bottom: 16px;
}
.domain-group-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 8px;
  padding-left: 4px;
}

/* ========== 关于我们 ========== */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}
.about-text h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.about-text p {
  color: var(--text-dim);
  margin-bottom: 12px;
  line-height: 1.8;
}
.about-text strong { color: var(--primary-light); }
.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.stat-box {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
}
.stat-box:hover { border-color: var(--border-active); }
.stat-box .num {
  font-size: 2rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary-light), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat-box .label { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }

/* ========== 项目照片墙 ========== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.gallery-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border-glass);
}
.gallery-item:hover {
  transform: scale(1.02);
  border-color: var(--border-active);
  box-shadow: 0 8px 32px rgba(59, 130, 246, 0.2);
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}
.gallery-item:hover img {
  transform: scale(1.05);
}
.gallery-overlay {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 16px;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  opacity: 0;
  transition: opacity 0.3s;
}
.gallery-item:hover .gallery-overlay { opacity: 1; }
.gallery-overlay span {
  color: white;
  font-size: 0.85rem;
  font-weight: 500;
}

/* ========== 视频区 ========== */
.video-wrapper {
  max-width: 720px;
  margin: 0 auto;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-glass);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
  background: #000;
}
.promo-video {
  display: block;
  width: 100%;
  background: #000;
}
.video-caption {
  text-align: center;
  padding: 10px 16px;
  color: var(--text-muted);
  font-size: 0.8rem;
  background: var(--bg-card);
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.95);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.lightbox.active { display: flex; }
.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: 4px;
  animation: zoomIn 0.3s ease;
}
@keyframes zoomIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}
.lightbox-close {
  position: absolute;
  top: 20px; right: 30px;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  z-index: 2001;
}

/* ========== 联系 ========== */
.contact-inner { max-width: 700px; }
.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 36px;
}
.contact-item {
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-glass);
}
.contact-item:last-child { border-bottom: none; }
.contact-item strong { color: var(--primary-light); margin-right: 8px; }

/* ========== 底部 ========== */
.footer {
  position: relative;
  z-index: 1;
  background: rgba(10, 14, 26, 0.95);
  border-top: 1px solid var(--border-glass);
  padding: 48px 24px 0;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 48px;
  padding-bottom: 36px;
}
.footer-brand p { color: var(--text-dim); font-size: 0.9rem; }
.footer-sub { color: var(--text-muted) !important; font-size: 0.8rem !important; margin-top: 4px; }
.footer-links {
  display: flex;
  gap: 48px;
}
.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
}
.footer-col a {
  display: block;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.8rem;
  margin-bottom: 6px;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--primary-light); }
.footer-bottom {
  border-top: 1px solid var(--border-glass);
  padding: 20px 0;
  text-align: center;
}
.footer-bottom p { font-size: 0.78rem; color: var(--text-muted); }

/* ========== 浮动 AI 按钮 ========== */
.ai-float {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  width: 56px; height: 56px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 24px rgba(59, 130, 246, 0.4);
  transition: var(--transition);
}
.ai-float:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 32px rgba(59, 130, 246, 0.6);
}
.ai-float-icon { font-size: 1.5rem; }
.ai-float-pulse {
  position: absolute;
  width: 100%; height: 100%;
  border-radius: 50%;
  border: 2px solid rgba(96, 165, 250, 0.4);
  animation: pulse-ring 2s infinite;
}
@keyframes pulse-ring {
  0% { transform: scale(1); opacity: 1; }
  100% { transform: scale(1.8); opacity: 0; }
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .navbar-links { display: none; }
  .navbar-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 14, 26, 0.98);
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--border-glass);
    backdrop-filter: blur(20px);
  }
  .mobile-toggle { display: block; }
  
  .hero-title-lg { font-size: 1.3rem; }
  .hero-stats { gap: 24px; }
  .hero-stat { padding: 0 12px; border-right: none; }
  .hero-stat .num { font-size: 1.6rem; }
  
  .ai-capability-grid { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .kb-demo { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { justify-content: space-between; }
  
  .section { padding: 64px 16px; }
  
  .ai-float { bottom: 20px; right: 20px; width: 48px; height: 48px; }
}