/* ============================================
   首页样式
   黑底彩调 · 科技时尚
   ============================================ */

/* ---------- 自定义属性 ---------- */
:root {
  --bg: #000000;
  --bg-soft: #0a0a0f;
  --bg-card: #111118;
  --bg-card-hover: #16161f;
  --text: #ffffff;
  --text-muted: rgba(255, 255, 255, 0.6);
  --text-dim: rgba(255, 255, 255, 0.4);
  --border: rgba(255, 255, 255, 0.08);
  --border-bright: rgba(255, 255, 255, 0.15);
  --purple: #a855f7;
  --pink: #ec4899;
  --cyan: #06b6d4;
  --blue: #3b82f6;
  --green: #10b981;
  --gold: #f59e0b;
  --red: #ef4444;
  --grad-main: linear-gradient(135deg, #a855f7 0%, #ec4899 50%, #06b6d4 100%);
  --grad-warm: linear-gradient(135deg, #f59e0b 0%, #ec4899 100%);
  --grad-cool: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --grad-vibe: linear-gradient(135deg, #a855f7 0%, #6366f1 100%);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --max-width: 1280px;
  --nav-h: 72px;
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- 重置 ---------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { border: none; background: none; cursor: pointer; color: inherit; font-family: inherit; }
img { max-width: 100%; display: block; }

::selection { background: var(--purple); color: #fff; }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-soft); }
::-webkit-scrollbar-thumb { background: linear-gradient(180deg, var(--purple), var(--pink)); border-radius: 4px; }

/* ---------- 通用 ---------- */
.gradient-text {
  background: var(--grad-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-label {
  display: inline-block;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--purple);
  text-transform: uppercase;
  margin-bottom: 16px;
  position: relative;
  padding-left: 28px;
}
.section-label::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 18px;
  height: 2px;
  background: var(--grad-main);
  border-radius: 1px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 64px;
}
.section-header .section-label { padding-left: 0; }
.section-header .section-label::before { display: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 100px;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.3s var(--ease);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad-main);
  color: #fff;
  box-shadow: 0 4px 24px rgba(168, 85, 247, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(168, 85, 247, 0.5);
}
.btn-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}
.btn-primary:hover::after { left: 100%; }

.btn-large {
  background: var(--grad-main);
  color: #fff;
  padding: 18px 48px;
  font-size: 1.15rem;
  box-shadow: 0 4px 32px rgba(168, 85, 247, 0.4);
}
.btn-large:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 48px rgba(168, 85, 247, 0.6);
}

/* ---------- 加载动画 ---------- */
.loader {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  transition: opacity 0.6s, visibility 0.6s;
}
.loader.hidden { opacity: 0; visibility: hidden; }

.loader-ring {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 3px solid transparent;
  border-top-color: var(--purple);
  border-right-color: var(--pink);
  border-bottom-color: var(--cyan);
  animation: spin 1s linear infinite;
}

.loader-text {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 4px;
  background: var(--grad-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 滚动进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--grad-main);
  z-index: 10000;
  transition: width 0.1s;
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 1000;
  transition: all 0.3s var(--ease);
}
.navbar.scrolled {
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-mark { display: flex; }
.logo-text {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.logo-text em {
  font-style: normal;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-left: 4px;
}

.nav-links {
  display: flex;
  gap: 8px;
}
.nav-links a {
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.95rem;
  color: var(--text-muted);
  transition: all 0.3s;
  position: relative;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.nav-cta {
  padding: 10px 24px;
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--grad-main);
  color: #fff;
  transition: all 0.3s;
  box-shadow: 0 2px 16px rgba(168, 85, 247, 0.3);
}
.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 24px rgba(168, 85, 247, 0.5);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: all 0.3s;
}

/* ---------- 首屏 Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero-particles {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-slideshow {
  position: relative;
  width: 100%;
  height: 100vh;
  z-index: 1;
}

.slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s var(--ease), visibility 0.8s;
}
.slide.active {
  opacity: 1;
  visibility: visible;
}

.slide-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 70% 50%, var(--g1) 0%, transparent 50%),
              radial-gradient(ellipse 60% 50% at 20% 80%, var(--g2) 0%, transparent 50%),
              radial-gradient(ellipse 50% 40% at 50% 20%, var(--g3) 0%, transparent 50%);
  opacity: 0.25;
  transition: opacity 0.8s;
}
.slide.active .slide-bg { opacity: 0.3; }

.slide-content {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 0 32px;
  padding-top: var(--nav-h);
}

.slide-tag {
  display: inline-block;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--g1);
  margin-bottom: 20px;
  padding: 6px 16px;
  border: 1px solid currentColor;
  border-radius: 100px;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s var(--ease-out) 0.2s;
}
.slide.active .slide-tag { opacity: 1; transform: translateY(0); }

.slide-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 24px;
  max-width: 700px;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.7s var(--ease-out) 0.35s;
}
.slide.active .slide-title { opacity: 1; transform: translateY(0); }

.slide-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-bottom: 36px;
  line-height: 1.7;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.7s var(--ease-out) 0.5s;
}
.slide.active .slide-desc { opacity: 1; transform: translateY(0); }

.slide .btn-primary {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.7s var(--ease-out) 0.65s;
}
.slide.active .btn-primary { opacity: 1; transform: translateY(0); }

/* 幻灯片右侧视觉元素 */
.slide-visual {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  width: 420px;
  height: 420px;
  z-index: 1;
}

.visual-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.5;
  animation: float 8s ease-in-out infinite;
}
.orb-1 {
  width: 200px; height: 200px;
  background: var(--g1);
  top: 10%; left: 10%;
  animation-delay: 0s;
}
.orb-2 {
  width: 160px; height: 160px;
  background: var(--g2);
  bottom: 15%; right: 5%;
  animation-delay: -2s;
}
.orb-3 {
  width: 120px; height: 120px;
  background: var(--g3);
  top: 40%; right: 30%;
  animation-delay: -4s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(20px, -30px) scale(1.05); }
  66% { transform: translate(-15px, 20px) scale(0.95); }
}

/* 视觉卡片 - 剧本打字 */
.visual-card {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 260px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
}
.vc-line {
  height: 8px;
  border-radius: 4px;
  margin-bottom: 12px;
  background: rgba(255, 255, 255, 0.1);
}
.vc-line.w1 { width: 80%; background: linear-gradient(90deg, var(--g1), transparent); }
.vc-line.w2 { width: 60%; background: linear-gradient(90deg, var(--g2), transparent); }
.vc-line.w3 { width: 70%; background: linear-gradient(90deg, var(--g3), transparent); }
.vc-cursor {
  display: inline-block;
  width: 3px;
  height: 16px;
  background: var(--g1);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* 视觉网格 - 分镜 */
.visual-grid {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  width: 280px;
}
.vg-cell {
  aspect-ratio: 16/10;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  position: relative;
  overflow: hidden;
}
.vg-cell::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--g1), var(--g2));
  opacity: 0.15;
}
.vg-cell:nth-child(2)::before { background: linear-gradient(135deg, var(--g2), var(--g3)); }
.vg-cell:nth-child(3)::before { background: linear-gradient(135deg, var(--g3), var(--g1)); }
.vg-cell:nth-child(4)::before { background: linear-gradient(135deg, var(--g2), var(--g1)); }
.vg-cell span { position: relative; z-index: 1; }

/* 视觉角色 */
.visual-avatar {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 200px;
  height: 240px;
}
.va-circle {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin: 0 auto;
  background: linear-gradient(135deg, var(--g1), var(--g2));
  box-shadow: 0 0 60px var(--g1);
}
.va-body {
  width: 140px;
  height: 120px;
  margin: -10px auto 0;
  border-radius: 70px 70px 0 0;
  background: linear-gradient(135deg, var(--g2), var(--g3));
  box-shadow: 0 0 40px var(--g2);
}

/* 视频播放器 */
.visual-player {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 300px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
}
.vp-screen {
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--g1), var(--g2), var(--g3));
  position: relative;
  overflow: hidden;
}
.vp-screen::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, transparent 30%, rgba(0,0,0,0.4) 100%);
}
.vp-bar {
  height: 4px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 2px;
  margin-top: 14px;
  overflow: hidden;
}
.vp-progress {
  width: 35%;
  height: 100%;
  background: var(--grad-main);
  border-radius: 2px;
  animation: progress 4s linear infinite;
}
@keyframes progress { to { width: 80%; } }
.vp-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
}
.vp-btn {
  width: 0;
  height: 0;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 10px solid var(--text);
}
.vp-time {
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* 幻灯片控制 */
.slide-controls {
  position: absolute;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 24px;
  z-index: 10;
}

.slide-arrow {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-bright);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
  color: var(--text-muted);
}
.slide-arrow:hover {
  border-color: var(--purple);
  color: var(--text);
  background: rgba(168, 85, 247, 0.1);
}

.slide-dots {
  display: flex;
  gap: 10px;
}
.dot {
  width: 30px;
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.2);
  transition: all 0.3s;
}
.dot.active {
  width: 50px;
  background: var(--grad-main);
}

.scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 2px;
}
.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, var(--text-dim), transparent);
  animation: scrollDown 2s ease-in-out infinite;
}
@keyframes scrollDown {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- 数据统计 ---------- */
.stats-bar {
  padding: 48px 32px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
}
.stats-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.stat-item {
  text-align: center;
}
.stat-num {
  display: block;
  font-family: "Space Grotesk", sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--grad-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ---------- 核心功能 ---------- */
.features {
  padding: 120px 32px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: all 0.4s var(--ease);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-color);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--card-color);
  transform: translateY(-6px);
}
.feature-card:hover::before { transform: scaleX(1); }

.feature-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  color: var(--card-color);
  margin-bottom: 24px;
  transition: all 0.4s;
}
.feature-card:hover .feature-icon {
  background: var(--card-color);
  color: #fff;
  box-shadow: 0 0 32px var(--card-color);
  border-color: transparent;
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ---------- 案例展示 ---------- */
.showcase {
  padding: 120px 32px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.showcase-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 48px;
}
.tab {
  padding: 10px 28px;
  border-radius: 100px;
  font-size: 0.95rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: all 0.3s var(--ease);
}
.tab:hover {
  color: var(--text);
  border-color: var(--border-bright);
}
.tab.active {
  color: #fff;
  background: var(--grad-main);
  border-color: transparent;
  box-shadow: 0 4px 20px rgba(168, 85, 247, 0.3);
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.case-card {
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.4s var(--ease);
  cursor: pointer;
}
.case-card.hidden {
  display: none;
}
.case-card.is-collapsed {
  display: none;
}
.showcase-more {
  display: flex;
  justify-content: center;
  margin-top: 36px;
}
.showcase-more[hidden] {
  display: none;
}
.showcase-more-btn {
  border: 1px solid rgba(168, 85, 247, 0.55);
  border-radius: 999px;
  padding: 11px 28px;
  color: #fff;
  background: linear-gradient(135deg, #7c3aed, #ec4899);
  font: inherit;
  cursor: pointer;
}
.case-card.fade-in {
  animation: fadeUp 0.5s var(--ease-out) both;
}

.case-poster {
  position: relative;
  aspect-ratio: 3/4;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.4s var(--ease);
}
.poster-pattern {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255,255,255,0.15) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(0,0,0,0.2) 0%, transparent 40%);
}
.poster-pattern img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.poster-pattern::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,0.5) 100%);
}

.case-genre {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 4px 14px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2;
}

.case-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 3;
}
.case-card:hover .case-overlay { opacity: 1; }
.case-card:hover .case-poster { transform: scale(1.03); }

.case-overlay p {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.9);
  text-align: center;
  line-height: 1.5;
}

.case-btn {
  padding: 8px 24px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid rgba(255,255,255,0.4);
  color: #fff;
  transition: all 0.3s;
}
.case-btn:hover {
  background: #fff;
  color: #000;
}

.case-info {
  padding: 16px 4px 0;
}
.case-info h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
  transition: color 0.3s;
}
.case-card:hover .case-info h3 { color: var(--purple); }

.case-meta {
  display: flex;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ---------- CTA ---------- */
.cta-section {
  position: relative;
  padding: 120px 32px;
  text-align: center;
  overflow: hidden;
}
.cta-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 50% 50% at 30% 50%, rgba(168, 85, 247, 0.15), transparent),
    radial-gradient(ellipse 50% 50% at 70% 50%, rgba(6, 182, 212, 0.15), transparent),
    radial-gradient(ellipse 40% 40% at 50% 30%, rgba(236, 72, 153, 0.1), transparent);
}
.cta-content {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
}
.cta-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
}
.cta-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 40px;
}
.cta-note {
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* ---------- 关于 ---------- */
.about {
  padding: 120px 32px;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}
.about-content { max-width: 680px; margin: 0 auto; }
.about-text {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.9;
  margin-bottom: 20px;
  text-align: left;
}

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding: 64px 32px 32px;
}
.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border);
}
.footer-brand .logo-text { font-size: 1.3rem; }
.footer-tagline {
  margin-top: 16px;
  color: var(--text-muted);
  font-size: 0.95rem;
}
.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
}
.footer-col a {
  display: block;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 10px;
  transition: color 0.3s;
}
.footer-col a:hover { color: var(--purple); }

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-bottom p {
  font-size: 0.85rem;
  color: var(--text-dim);
}
.footer-social {
  display: flex;
  gap: 12px;
}
.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: all 0.3s;
}
.footer-social a:hover {
  border-color: var(--purple);
  color: var(--purple);
  background: rgba(168, 85, 247, 0.1);
}

/* ---------- 滚动出现动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .showcase-grid { grid-template-columns: repeat(3, 1fr); }
  .slide-visual { width: 320px; height: 320px; right: 3%; }
  .stats-container { grid-template-columns: repeat(2, 1fr); gap: 24px; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(0,0,0,0.95);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 4px;
  }
  .nav-links.open a { padding: 12px 18px; }

  .slide-visual { display: none; }
  .slide-content { padding-top: calc(var(--nav-h) + 20px); }

  .features-grid { grid-template-columns: 1fr; }
  .showcase-grid { grid-template-columns: repeat(2, 1fr); }

  .features, .showcase { padding: 80px 20px; }
  .stats-bar { padding: 32px 20px; }
  .stats-container { grid-template-columns: repeat(2, 1fr); }

  .section-header { margin-bottom: 40px; }

  .slide-controls { bottom: 60px; gap: 16px; }

  .footer-container { grid-template-columns: 1fr; gap: 40px; }
  .footer-bottom { flex-direction: column; gap: 16px; }

  .about { padding: 80px 20px; }
}

@media (max-width: 480px) {
  .showcase-grid { grid-template-columns: 1fr; }
  .stats-container { grid-template-columns: 1fr; }
  .nav-container { padding: 0 20px; }
  .slide-content { padding: calc(var(--nav-h) + 20px) 20px 0; }
  .showcase-tabs { gap: 8px; }
  .tab { padding: 8px 18px; font-size: 0.85rem; }
  .btn-large { padding: 16px 36px; font-size: 1rem; }
}