/* ==========================================================================
   楚汐互娱 Chuxi Interactive — 官网样式
   纯 CSS，无框架依赖
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  --bg-0: #070b14;
  --bg-1: #0a101f;
  --surface: rgba(148, 178, 255, 0.05);
  --surface-strong: rgba(148, 178, 255, 0.09);
  --border: rgba(148, 178, 255, 0.14);
  --border-strong: rgba(148, 178, 255, 0.26);

  --text: #e8eefb;
  --text-dim: #98a5c0;
  --text-faint: #6b7893;

  --cyan: #22d3ee;
  --blue: #4f7cff;
  --violet: #7c5cff;

  --grad: linear-gradient(135deg, #22d3ee 0%, #4f7cff 55%, #7c5cff 100%);
  --grad-soft: linear-gradient(135deg, rgba(34, 211, 238, 0.14), rgba(79, 124, 255, 0.14) 55%, rgba(124, 92, 255, 0.14));

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;

  --shadow-glow: 0 10px 40px -12px rgba(79, 124, 255, 0.45);
  --shadow-card: 0 20px 50px -20px rgba(2, 6, 18, 0.8);

  --container: 1180px;
  --header-h: 76px;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-0);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; display: inline-block; vertical-align: middle; }

a { color: inherit; text-decoration: none; }

ul, ol { list-style: none; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

::selection { background: rgba(79, 124, 255, 0.45); color: #fff; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: min(100% - 48px, var(--container));
  margin-inline: auto;
}

/* 跳转链接（无障碍） */
.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--blue);
  color: #fff;
  border-radius: 8px;
  transition: top 0.25s;
}
.skip-link:focus { top: 12px; }

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 999px;
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  transition: transform 0.25s ease, box-shadow 0.25s ease,
    background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
  white-space: nowrap;
}
.btn svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 44px -12px rgba(79, 124, 255, 0.65);
}

.btn-ghost {
  border-color: var(--border-strong);
  color: var(--text);
  background: rgba(148, 178, 255, 0.04);
}
.btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
}

.btn-outline {
  border-color: var(--border-strong);
  color: var(--text);
  background: transparent;
}
.btn-outline:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn-inverse {
  background: #fff;
  color: #131c33;
}
.btn-inverse:hover { transform: translateY(-2px); box-shadow: 0 14px 34px -12px rgba(0, 0, 0, 0.55); }

.btn-outline-light {
  border-color: rgba(255, 255, 255, 0.55);
  color: #fff;
}
.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #fff;
}

.btn-lg { padding: 16px 34px; font-size: 1.05rem; }
.btn-sm { padding: 9px 20px; font-size: 0.9rem; }

/* ==========================================================================
   顶部导航
   ========================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  transition: background 0.35s ease, border-color 0.35s ease, height 0.35s ease;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  height: 64px;
  background: rgba(7, 11, 20, 0.78);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { display: inline-flex; align-items: center; flex-shrink: 0; }
.brand img { height: 42px; width: auto; }
.site-header.scrolled .brand img { height: 38px; }

.site-nav { display: flex; align-items: center; gap: 28px; }

.nav-list { display: flex; align-items: center; gap: 4px; }

.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 0.96rem;
  color: var(--text-dim);
  border-radius: 8px;
  position: relative;
  transition: color 0.25s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  background: var(--grad);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width 0.28s ease;
}
.nav-link:hover { color: var(--text); }
.nav-link.active { color: var(--text); }
.nav-link.active::after { width: 20px; }

.nav-cta { flex-shrink: 0; }

/* 移动端汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
}
.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-toggle.open .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle.open .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(4, 7, 14, 0.6);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.nav-backdrop.show { opacity: 1; pointer-events: auto; }

/* ==========================================================================
   首屏 Hero
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 48px) 0 96px;
  overflow: hidden;
}

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

/* 渐变光球 */
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  z-index: 0;
  pointer-events: none;
  animation: orb-float 14s ease-in-out infinite alternate;
}
.orb-cyan {
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.4), transparent 65%);
  top: -140px; right: -120px;
}
.orb-blue {
  width: 560px; height: 560px;
  background: radial-gradient(circle, rgba(79, 124, 255, 0.35), transparent 65%);
  bottom: -220px; left: -160px;
  animation-delay: -5s;
}
.orb-violet {
  width: 360px; height: 360px;
  background: radial-gradient(circle, rgba(124, 92, 255, 0.32), transparent 65%);
  top: 30%; left: 58%;
  animation-delay: -9s;
}
@keyframes orb-float {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(40px, -34px, 0) scale(1.12); }
}

/* 网格底纹 */
.hero-grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(148, 178, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 178, 255, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, #000 30%, transparent 75%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: rgba(10, 16, 31, 0.55);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--text-dim);
  font-size: 0.9rem;
  letter-spacing: 0.06em;
}
.badge-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px 2px rgba(34, 211, 238, 0.8);
  animation: pulse 2.2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.35); opacity: 0.65; }
}

.hero-title {
  margin-top: 28px;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: 0.01em;
}
.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-typing {
  margin-top: 20px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  font-size: clamp(1.1rem, 2.4vw, 1.45rem);
  font-weight: 600;
  min-height: 1.8em;
}
.typing-label {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-faint);
  letter-spacing: 0.2em;
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.typing-text {
  background: linear-gradient(90deg, var(--cyan), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.typing-cursor {
  color: var(--cyan);
  font-weight: 400;
  animation: blink 1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-sub {
  margin: 24px auto 0;
  max-width: 640px;
  color: var(--text-dim);
  font-size: clamp(1rem, 1.6vw, 1.12rem);
}

.hero-actions {
  margin-top: 40px;
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* 数据统计 */
.hero-stats {
  margin: 64px auto 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 860px;
}
.stat {
  padding: 22px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: rgba(10, 16, 31, 0.5);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}
.stat dt {
  font-size: clamp(1.7rem, 3.4vw, 2.3rem);
  font-weight: 800;
  line-height: 1.15;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-suffix { font-size: 0.62em; font-weight: 700; }
.stat dd {
  margin-top: 4px;
  font-size: 0.88rem;
  color: var(--text-dim);
}

/* 下滑提示 */
.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  opacity: 0.75;
  transition: opacity 0.25s;
}
.scroll-hint:hover { opacity: 1; }
.scroll-mouse {
  width: 24px; height: 38px;
  border: 2px solid var(--text-dim);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}
.scroll-wheel {
  width: 3px; height: 8px;
  border-radius: 3px;
  background: var(--cyan);
  animation: wheel 1.8s ease-in-out infinite;
}
@keyframes wheel {
  0% { transform: translateY(0); opacity: 1; }
  70% { transform: translateY(12px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}
.scroll-arrow svg {
  width: 18px; height: 18px;
  fill: none; stroke: var(--text-dim);
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
  animation: bounce 1.8s ease-in-out infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

/* ==========================================================================
   通用区块
   ========================================================================== */
.section { padding: 110px 0; position: relative; }

.section-alt {
  background: var(--bg-1);
  border-top: 1px solid rgba(148, 178, 255, 0.07);
  border-bottom: 1px solid rgba(148, 178, 255, 0.07);
}

.section-head {
  max-width: 680px;
  margin: 0 auto 64px;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.3;
}

.section-lead {
  margin-top: 16px;
  color: var(--text-dim);
  font-size: 1.05rem;
}

/* ==========================================================================
   核心业务
   ========================================================================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.biz-card {
  position: relative;
  padding: 38px 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
  overflow: hidden;
}
.biz-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad);
  opacity: 0;
  transition: opacity 0.35s ease;
}
.biz-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(79, 124, 255, 0.12),
    0 20px 60px -24px rgba(79, 124, 255, 0.4);
}
.biz-card:hover::before { opacity: 1; }

.biz-icon {
  width: 62px; height: 62px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: var(--grad-soft);
  border: 1px solid rgba(148, 178, 255, 0.18);
}
.biz-icon svg {
  width: 30px; height: 30px;
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.biz-tag {
  margin-top: 22px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.biz-title {
  margin-top: 8px;
  font-size: 1.32rem;
  font-weight: 700;
}

.biz-desc {
  margin-top: 12px;
  color: var(--text-dim);
  font-size: 0.97rem;
}

.biz-list { margin-top: 20px; display: grid; gap: 10px; }
.biz-list li {
  position: relative;
  padding-left: 26px;
  font-size: 0.93rem;
  color: var(--text-dim);
}
.biz-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: rgba(34, 211, 238, 0.12);
  color: var(--cyan);
  font-size: 0.72rem;
  font-weight: 700;
  display: grid;
  place-items: center;
  line-height: 1;
}

/* ==========================================================================
   应用场景
   ========================================================================== */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.scene-card {
  padding: 34px 26px;
  text-align: center;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: transform 0.35s ease, border-color 0.35s ease, background 0.35s ease;
}
.scene-card:hover {
  transform: translateY(-6px);
  border-color: rgba(34, 211, 238, 0.4);
  background: var(--surface-strong);
}

.scene-icon {
  width: 66px; height: 66px;
  margin: 0 auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--grad-soft);
  border: 1px solid rgba(148, 178, 255, 0.18);
}
.scene-icon svg {
  width: 30px; height: 30px;
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform 0.35s ease;
}
.scene-card:hover .scene-icon svg { transform: scale(1.12); }

.scene-title { margin-top: 20px; font-size: 1.15rem; font-weight: 700; }

.scene-desc {
  margin-top: 10px;
  font-size: 0.92rem;
  color: var(--text-dim);
}

/* ==========================================================================
   核心优势
   ========================================================================== */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.adv-card {
  display: flex;
  flex-direction: column;
  padding: 30px 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.adv-card:hover {
  transform: translateY(-5px);
  border-color: rgba(124, 92, 255, 0.45);
}

.adv-icon {
  width: 50px; height: 50px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.16), rgba(34, 211, 238, 0.12));
  border: 1px solid rgba(148, 178, 255, 0.18);
}
.adv-icon svg {
  width: 24px; height: 24px;
  fill: none;
  stroke: #a78bfa;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.adv-title { margin-top: 18px; font-size: 1.1rem; font-weight: 700; }

.adv-desc { margin-top: 8px; font-size: 0.93rem; color: var(--text-dim); }

/* ==========================================================================
   合作流程
   ========================================================================== */
.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  counter-reset: step;
}

.process-step {
  position: relative;
  padding: 30px 22px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.process-step:hover {
  transform: translateY(-5px);
  border-color: rgba(34, 211, 238, 0.4);
}

/* 连接箭头（桌面端） */
.process-step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -16px;
  width: 12px; height: 12px;
  border-top: 2px solid var(--text-faint);
  border-right: 2px solid var(--text-faint);
  transform: translateY(-50%) rotate(45deg);
  opacity: 0.55;
}

.step-num {
  font-size: 2.1rem;
  font-weight: 800;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: 0.9;
}

.step-title { margin-top: 14px; font-size: 1.08rem; font-weight: 700; }

.step-desc { margin-top: 8px; font-size: 0.9rem; color: var(--text-dim); }

/* ==========================================================================
   联系我们
   ========================================================================== */
.section-contact {
  background:
    radial-gradient(ellipse 60% 45% at 50% 0%, rgba(79, 124, 255, 0.12), transparent 70%),
    var(--bg-0);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 40px 30px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: transform 0.35s ease, border-color 0.35s ease;
}
.contact-card:hover { transform: translateY(-6px); border-color: var(--border-strong); }

.contact-card-featured {
  border-color: rgba(79, 124, 255, 0.5);
  background:
    linear-gradient(180deg, rgba(79, 124, 255, 0.1), rgba(124, 92, 255, 0.06)),
    var(--surface);
  box-shadow: 0 24px 60px -28px rgba(79, 124, 255, 0.55);
}
.contact-card-featured:hover { border-color: var(--blue); }

.contact-icon {
  width: 58px; height: 58px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: var(--grad-soft);
  border: 1px solid rgba(148, 178, 255, 0.2);
}
.contact-icon svg {
  width: 28px; height: 28px;
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.contact-title { margin-top: 18px; font-size: 1.18rem; font-weight: 700; }

.contact-label {
  margin-top: 16px;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--text-faint);
}

.contact-value {
  margin-top: 4px;
  font-family: "SF Mono", "Cascadia Code", Consolas, "Courier New", monospace;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan);
  user-select: all;
}

.contact-note {
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.contact-card .copy-btn,
.contact-card .taobao-link { margin-top: 16px; }

.qr-wrap {
  margin-top: 22px;
  padding: 10px 10px 8px;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 12px 30px -14px rgba(0, 0, 0, 0.7);
}
.qr-img {
  display: block;
  width: 132px;
  height: 132px;
}
.qr-tip {
  margin-top: 6px;
  font-size: 0.78rem;
  color: #33415c;
  text-align: center;
  letter-spacing: 0.12em;
}

/* 底部 CTA 横幅 */
.cta-banner {
  margin-top: 72px;
  padding: 52px 56px;
  border-radius: calc(var(--radius-lg) + 6px);
  background: var(--grad);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.cta-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 20%, rgba(255, 255, 255, 0.22), transparent 42%),
    radial-gradient(circle at 8% 90%, rgba(255, 255, 255, 0.14), transparent 40%);
  pointer-events: none;
}
.cta-text { position: relative; }
.cta-text h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  color: #fff;
}
.cta-text p {
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 1rem;
}
.cta-actions {
  position: relative;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: #05080f;
  border-top: 1px solid rgba(148, 178, 255, 0.09);
  padding-top: 64px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-logo { height: 40px; width: auto; }

.footer-desc {
  margin-top: 18px;
  max-width: 380px;
  font-size: 0.92rem;
  color: var(--text-faint);
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 18px;
  color: var(--text);
}

.footer-nav li + li,
.footer-contact li + li { margin-top: 10px; }

.footer-nav a,
.footer-contact li {
  font-size: 0.92rem;
  color: var(--text-faint);
  transition: color 0.25s;
}
.footer-nav a:hover { color: var(--cyan); }
.footer-contact a,
.footer-nav a {
  color: var(--text-dim);
  border-bottom: 1px dashed var(--border-strong);
  padding-bottom: 1px;
  transition: color 0.25s, border-color 0.25s;
}
.footer-contact a:hover,
.footer-nav a:hover { color: var(--cyan); border-color: var(--cyan); }

.footer-bottom {
  border-top: 1px solid rgba(148, 178, 255, 0.08);
  padding: 22px 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-faint);
}

.footer-bottom a {
  color: var(--text-dim);
  border-bottom: 1px dashed var(--border-strong);
  transition: color 0.25s, border-color 0.25s;
}
.footer-bottom a:hover { color: var(--cyan); border-color: var(--cyan); }

/* ==========================================================================
   回到顶部 & Toast
   ========================================================================== */
.back-to-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 80;
  width: 48px; height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(10, 16, 31, 0.85);
  border: 1px solid var(--border-strong);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease, border-color 0.3s ease;
}
.back-to-top svg {
  width: 20px; height: 20px;
  fill: none; stroke: var(--cyan);
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.back-to-top.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-to-top:hover { border-color: var(--cyan); }

.toast {
  position: fixed;
  left: 50%;
  bottom: 40px;
  z-index: 120;
  transform: translate(-50%, 20px);
  padding: 12px 24px;
  border-radius: 999px;
  background: rgba(13, 20, 38, 0.92);
  border: 1px solid rgba(34, 211, 238, 0.45);
  color: var(--cyan);
  font-size: 0.92rem;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: 0 14px 40px -12px rgba(0, 0, 0, 0.7);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ==========================================================================
   滚动渐入动效
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.75s cubic-bezier(0.22, 0.61, 0.36, 1),
    transform 0.75s cubic-bezier(0.22, 0.61, 0.36, 1);
  transition-delay: var(--reveal-delay, 0s);
  will-change: opacity, transform;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .process-steps { grid-template-columns: repeat(3, 1fr); }
  .process-step:not(:last-child)::after { display: none; }
  .scene-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-grid, .card-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .section { padding: 84px 0; }

  .nav-toggle { display: flex; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 95;
    height: 100vh;
    height: 100dvh;
    width: min(78vw, 320px);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 8px;
    padding: calc(var(--header-h) + 20px) 28px 32px;
    background: rgba(9, 14, 27, 0.97);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    border-left: 1px solid var(--border);
    transform: translateX(105%);
    transition: transform 0.38s cubic-bezier(0.22, 0.61, 0.36, 1);
  }
  .site-nav.open { transform: translateX(0); }

  .nav-list { flex-direction: column; align-items: stretch; width: 100%; gap: 2px; }
  .nav-link {
    padding: 13px 10px;
    font-size: 1.05rem;
    border-radius: 10px;
  }
  .nav-link::after { display: none; }
  .nav-link.active, .nav-link:hover {
    color: var(--cyan);
    background: rgba(34, 211, 238, 0.07);
  }
  .nav-cta { margin-top: 18px; width: 100%; }

  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .container { width: min(100% - 36px, var(--container)); }

  .card-grid, .adv-grid, .scene-grid, .contact-grid { grid-template-columns: 1fr; }

  .process-steps { grid-template-columns: 1fr; }
  .process-step { padding-left: 20px; }

  .hero { padding-bottom: 120px; }
  .hero-actions .btn { width: 100%; }
  .hero-stats { gap: 10px; }
  .stat { padding: 16px 10px; }

  .cta-banner { padding: 40px 26px; }
  .cta-actions { width: 100%; flex-direction: column; }
  .cta-actions .btn { width: 100%; }

  .footer-inner { grid-template-columns: 1fr; gap: 36px; }

  .back-to-top { right: 18px; bottom: 18px; }
}

/* ==========================================================================
   减弱动态效果（无障碍）
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}