/* =============================================
   泰伯 AI — 主样式表 v3
   黑·蓝·紫 配色体系 · 简约科技风 · 响应式适配
   ============================================= */

/* ----- CSS 变量 ----- */
:root {
  --bg-deep: #070c1a;
  --bg-mid: #0b1229;
  --bg-section: #090f21;
  --bg-card: rgba(20, 30, 60, 0.55);
  --bg-card-hover: rgba(25, 38, 75, 0.75);
  --text-primary: #e5e9f2;
  --text-secondary: #8896b4;
  --text-muted: #5a6680;
  --blue: #4f8ef7;
  --blue-light: #7cb4fa;
  --blue-dim: rgba(79, 142, 247, 0.25);
  --blue-glow: rgba(79, 142, 247, 0.12);
  --purple: #8b6cf6;
  --purple-light: #b49cfa;
  --purple-dim: rgba(139, 108, 246, 0.25);
  --purple-glow: rgba(139, 108, 246, 0.12);
  --gradient: linear-gradient(135deg, var(--blue), var(--purple));
  --gradient-text: linear-gradient(135deg, var(--blue) 0%, var(--blue-light) 40%, var(--purple-light) 80%);
  --border-subtle: rgba(79, 142, 247, 0.08);
  --border-blue: rgba(79, 142, 247, 0.18);
  --border-purple: rgba(139, 108, 246, 0.15);
  --radius: 14px;
  --radius-sm: 8px;
  --font-cn: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-tech: 'Orbitron', monospace;
  --nav-height: 64px;
  --max-width: 1200px;
}

/* ----- Reset ----- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }
body {
  font-family: var(--font-cn);
  background: linear-gradient(180deg, #0d1a3a 0%, #1e3a7a 25%, #3a2a6a 55%, #201040 85%, #0e0820 100%) fixed;
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; border: none; background: none; color: inherit; }
input, textarea { font-family: inherit; }

/* ----- 粒子画布 ----- */
#particle-canvas {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

/* ===== 导航栏 ===== */
.nav-bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(7, 12, 26, 0.82);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background 0.3s, box-shadow 0.3s;
}
.nav-bar.scrolled {
  background: rgba(7, 12, 26, 0.94);
  box-shadow: 0 1px 30px rgba(79, 142, 247, 0.06);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 700;
  flex-shrink: 0;
}
.logo-img {
  height: 34px;
  width: auto;
  filter: drop-shadow(0 0 6px rgba(139, 108, 246, 0.35));
  transition: filter 0.3s;
}
.logo-img:hover {
  filter: drop-shadow(0 0 12px rgba(139, 108, 246, 0.6));
}
.nav-links { display: flex; gap: 2px; }
.nav-link {
  padding: 8px 16px;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.25s;
}
.nav-link:hover { color: var(--blue-light); background: rgba(79, 142, 247, 0.06); }
.nav-link.active { color: var(--blue); background: rgba(79, 142, 247, 0.1); font-weight: 600; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; z-index: 101; }
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Hero ===== */
.hero {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 60px;
  background: radial-gradient(ellipse 80% 50% at 50% 40%, rgba(139, 108, 246, 0.08) 0%, transparent 70%);
}
.hero-content { max-width: 800px; }
.hero-eyebrow {
  font-family: var(--font-tech);
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--blue-light);
  margin-bottom: 24px;
  opacity: 0.85;
}
.hero-title {
  font-size: clamp(36px, 7vw, 64px);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 28px;
  letter-spacing: -0.02em;
}
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-typer {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  min-height: 30px;
}
.typer-cursor {
  display: inline-block;
  color: var(--blue);
  font-weight: 100;
  animation: blink 0.8s infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 60px; }
.hero-stats { display: flex; gap: 48px; justify-content: center; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.stat-num { font-size: 42px; font-weight: 900; font-family: var(--font-tech); color: var(--blue); display: block; }
.stat-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; display: block; }
.hero-scroll {
  position: absolute;
  bottom: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  animation: float 2s ease-in-out infinite;
}
.scroll-line {
  width: 1px; height: 40px;
  background: linear-gradient(to bottom, var(--blue), transparent);
}
.scroll-text { font-size: 11px; color: var(--text-muted); letter-spacing: 2px; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(8px); } }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  transition: all 0.3s;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 24px rgba(79, 142, 247, 0.35);
}
.btn-primary:hover {
  box-shadow: 0 6px 36px rgba(79, 142, 247, 0.5);
  transform: translateY(-2px);
}
.btn-outline {
  border: 1px solid var(--border-blue);
  color: var(--blue-light);
  background: rgba(79, 142, 247, 0.05);
}
.btn-outline:hover {
  background: rgba(79, 142, 247, 0.12);
  box-shadow: 0 0 24px rgba(79, 142, 247, 0.15);
}
.btn-full { width: 100%; justify-content: center; }
.btn-arrow { transition: transform 0.3s; }
.btn-primary:hover .btn-arrow { transform: translateX(4px); }

/* =============================================
   区块底色交替
   ============================================= */

/* 默认区块：深蓝黑背景 */
.section {
  position: relative;
  z-index: 2;
  padding: 100px 24px;
}

/* 区块底色 — 完全透明，让 body 固定渐变完全可见 */
#ai-capabilities,
#products,
#advantages,
#scenarios,
#cases,
#about,
#contact { background: transparent; }

/* 区块顶部微妙的发光过渡条 */
.section::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 10%,
    rgba(79, 142, 247, 0.08) 50%,
    transparent 90%
  );
}
#products::after, #about::after {
  background: linear-gradient(90deg,
    transparent 10%,
    rgba(139, 108, 246, 0.08) 50%,
    transparent 90%
  );
}

/* ===== 区块标题 ===== */
.section-header { text-align: center; margin-bottom: 60px; }
.section-label {
  font-family: var(--font-tech);
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--purple);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  margin-bottom: 12px;
}
.section-desc { color: var(--text-secondary); font-size: 16px; }

/* ===== 卡片网格 ===== */
.cards-grid {
  display: grid;
  gap: 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}
.cards-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cards-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cards-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ===== 玻璃态卡片 ===== */
.card-glass {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}
.card-glass::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(79, 142, 247, 0.03), rgba(139, 108, 246, 0.03));
  opacity: 0;
  transition: opacity 0.35s;
  z-index: -1;
}
.card-glass:hover {
  border-color: var(--border-blue);
  box-shadow: 0 8px 40px rgba(79, 142, 247, 0.08), 0 0 0 1px rgba(79, 142, 247, 0.08);
  transform: translateY(-3px);
}
.card-glass:hover::before { opacity: 1; }
.card-icon { font-size: 30px; margin-bottom: 14px; }
.card-title { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.card-subtitle { font-size: 13px; color: var(--blue-light); margin-bottom: 12px; font-weight: 500; }
.card-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.8; }

/* 高亮卡片 */
.card-highlight { border-color: rgba(79, 142, 247, 0.18); background: rgba(20, 35, 70, 0.65); }
.card-featured { border-color: rgba(139, 108, 246, 0.18); background: rgba(30, 25, 65, 0.6); }
.card-badge {
  position: absolute;
  top: 16px; right: 16px;
  font-size: 11px;
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(79, 142, 247, 0.1);
  color: var(--blue-light);
  font-weight: 600;
  letter-spacing: 1px;
}
.card-featured .card-badge { background: rgba(139, 108, 246, 0.12); color: var(--purple-light); }

/* 能力卡片 */
.card-ability { padding: 32px; min-height: 280px; }
/* 产品卡片 */
.card-product { padding: 28px; text-align: center; }
/* 优势卡片 */
.card-advantage { padding: 28px; text-align: center; }

/* 场景卡片（旧简洁版） */
.card-scene { padding: 24px; }
.card-scene .scene-num { font-family: var(--font-tech); font-size: 14px; color: var(--blue); opacity: 0.55; margin-bottom: 8px; display: block; }
.card-scene h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.card-scene p { font-size: 13px; color: var(--text-secondary); }

/* 详细场景卡片 */
.card-scene-detail {
  padding: 28px;
  min-height: 280px;
  display: flex;
  flex-direction: column;
}
.card-scene-detail .scene-num {
  font-family: var(--font-tech);
  font-size: 13px;
  color: var(--purple-light);
  opacity: 0.5;
  margin-bottom: 6px;
  display: block;
}
.card-scene-detail h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.card-scene-detail .scene-summary {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.7;
}
.scene-dots {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 8px;
}
.scene-dots li {
  font-size: 13px; color: var(--text-primary);
  padding-left: 16px; position: relative; line-height: 1.6;
}
.scene-dots li::before {
  content: '▸';
  position: absolute; left: 0;
  color: var(--blue);
  font-weight: 700;
}

/* 风险标签 */
.risk-grid { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.risk-item {
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(220, 80, 80, 0.08);
  border: 1px solid rgba(220, 80, 80, 0.18);
  color: #fca5a5;
}

/* ===== 客户案例 ===== */
.case-logos {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  max-width: var(--max-width);
  margin: 0 auto;
}
.case-logo-item {
  padding: 20px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  transition: all 0.3s;
  cursor: default;
  text-align: center;
}
.case-logo-item:hover {
  border-color: var(--border-blue);
  box-shadow: 0 0 30px rgba(79, 142, 247, 0.06);
}
.case-name { font-size: 16px; font-weight: 600; color: var(--text-primary); letter-spacing: 1px; }
.case-ind { display: block; font-size: 11px; color: var(--text-muted); margin-top: 4px; letter-spacing: 0; }

/* ===== 关于我们 ===== */
.about-content { max-width: 800px; margin: 0 auto; }
.about-card { padding: 32px; margin-bottom: 32px; }
.about-intro {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 16px;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.about-text { font-size: 15px; color: var(--text-secondary); line-height: 2; text-align: justify; }
.about-text + .about-text { margin-top: 12px; }
.about-text strong { color: var(--blue-light); }
.about-badges { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 32px; }
.about-badge {
  font-size: 13px;
  padding: 7px 18px;
  border-radius: 50px;
  background: rgba(139, 108, 246, 0.06);
  border: 1px solid rgba(139, 108, 246, 0.15);
  color: var(--purple-light);
}
.about-values { display: flex; flex-direction: column; gap: 12px; }
.value-item {
  font-size: 15px;
  color: var(--text-secondary);
  padding: 14px 20px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  max-width: var(--max-width);
  margin: 0 auto;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 16px; }
.contact-item { font-size: 16px; display: flex; align-items: center; gap: 12px; color: var(--text-secondary); }
.contact-icon { font-size: 20px; flex-shrink: 0; }
.contact-item a { color: var(--blue-light); transition: color 0.2s; }
.contact-item a:hover { color: #fff; }
.contact-form-card { padding: 32px; }
.contact-form-card h3 { margin-bottom: 20px; font-size: 18px; }
.contact-form { display: flex; flex-direction: column; gap: 14px; }
.form-input {
  width: 100%;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: rgba(20, 30, 60, 0.4);
  color: var(--text-primary);
  font-size: 14px;
  transition: border-color 0.3s, box-shadow 0.3s;
  outline: none;
  resize: vertical;
}
.form-input::placeholder { color: var(--text-muted); }
.form-input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(79, 142, 247, 0.12);
}

/* ===== 页脚 ===== */
.footer {
  position: relative; z-index: 2;
  background: #0a0f26;
  border-top: 1px solid var(--border-subtle);
  padding: 48px 24px 32px;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
  text-align: center;
}
.footer-logo { font-size: 18px; font-weight: 700; }
.footer-brand p { color: var(--text-muted); font-size: 13px; margin-top: 6px; }
.footer-links { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; }
.footer-links a { font-size: 13px; color: var(--text-muted); transition: color 0.2s; }
.footer-links a:hover { color: var(--blue-light); }
.footer-copy { font-size: 12px; color: var(--text-muted); }
.footer-copy p + p { margin-top: 4px; }

/* ===== 动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* =============================================
   响应式适配
   ============================================= */

/* 平板 (768px - 1023px) */
@media (max-width: 1023px) {
  .cards-grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .cards-grid.cols-3 { grid-template-columns: repeat(2, 1fr); }
  .cards-grid.cols-2 { grid-template-columns: 1fr; }
  .card-scene-detail { min-height: auto; }
  .contact-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero-stats { gap: 32px; }
  .stat-num { font-size: 34px; }
  .hero-title { font-size: clamp(28px, 6vw, 48px); }
  .section { padding: 80px 20px; }
}

/* 手机 (< 768px) */
@media (max-width: 767px) {
  :root { --nav-height: 56px; }

  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    width: 280px; height: 100vh;
    background: rgba(7, 12, 26, 0.96);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 8px;
    transition: right 0.35s ease;
    border-left: 1px solid var(--border-subtle);
  }
  .nav-links.open { right: 0; }
  .nav-link { padding: 14px 16px; font-size: 16px; border-radius: var(--radius-sm); }

  .hero { padding: 100px 16px 48px; }
  .hero-eyebrow { font-size: 10px; letter-spacing: 3px; }
  .hero-title { font-size: 30px; }
  .hero-typer { font-size: 15px; }
  .hero-cta { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 280px; justify-content: center; }
  .hero-stats { gap: 20px; }
  .stat-num { font-size: 28px; }

  .cards-grid.cols-4, .cards-grid.cols-3, .cards-grid.cols-2 { grid-template-columns: 1fr; }
  .card-scene-detail { min-height: auto; padding: 20px; }
  .card-ability { padding: 24px; }
  .card-product, .card-advantage { padding: 24px; }
  .card-icon { font-size: 28px; }

  .case-logos { gap: 10px; }
  .case-logo-item { padding: 14px 20px; }
  .case-name { font-size: 14px; }

  .about-card { padding: 24px; }
  .about-badges { gap: 8px; }
  .about-badge { font-size: 12px; padding: 6px 14px; }
  .value-item { font-size: 14px; padding: 12px 16px; }

  .contact-form-card { padding: 24px; }
  .contact-item { font-size: 14px; gap: 8px; }

  .section { padding: 60px 16px; }
  .section-header { margin-bottom: 40px; }
  .section-title { font-size: 26px; }
  .section-label { font-size: 11px; letter-spacing: 3px; }

  .footer-links { gap: 16px; }
  .footer-links a { font-size: 12px; }
}

/* 大屏优化 (> 1400px) */
@media (min-width: 1400px) {
  .hero-title { font-size: 72px; }
  .hero-stats { gap: 64px; }
  .stat-num { font-size: 48px; }
  .section { padding: 120px 24px; }
}