/* =================================================================
   云海计划专题页 styles
   命名空间: cs- (cloud-sea)
   风格: 暗色科技风,与主站 #5024ff/#006be8/#00d4ff 调色一致
================================================================= */

:root {
  --cs-bg: #050010;
  --cs-bg-soft: #0a0117;
  --cs-surface: rgba(20, 14, 40, 0.7);
  --cs-surface-soft: rgba(40, 28, 80, 0.4);
  --cs-line: rgba(120, 100, 200, 0.18);
  --cs-line-strong: rgba(120, 100, 200, 0.36);
  --cs-text: #ffffff;
  --cs-text-dim: rgba(255, 255, 255, 0.72);
  --cs-text-mute: rgba(255, 255, 255, 0.5);
  --cs-accent: #5024ff;
  --cs-accent-blue: #006be8;
  --cs-accent-cyan: #00d4ff;
  --cs-accent-pink: #ff6ec7;
  --cs-grad-primary: linear-gradient(135deg, #5024ff 0%, #006be8 50%, #00d4ff 100%);
  --cs-grad-text: linear-gradient(135deg, #b39bff 0%, #6db4ff 60%, #00d4ff 100%);
  --cs-grad-border: linear-gradient(135deg, rgba(80, 36, 255, 0.6), rgba(0, 212, 255, 0.4));
  --cs-shadow-glow: 0 28px 80px rgba(80, 36, 255, 0.35);
  --cs-radius: 18px;
  --cs-radius-lg: 28px;
  --cs-max: 1280px;
  --cs-gutter-x: clamp(20px, 5vw, 80px);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "PingFang SC", "Helvetica Neue", "Microsoft YaHei", -apple-system, sans-serif;
  font-weight: 400;
  color: var(--cs-text);
  background: var(--cs-bg);
  background-image:
    radial-gradient(ellipse at 20% 0%, rgba(80, 36, 255, 0.25), transparent 50%),
    radial-gradient(ellipse at 80% 30%, rgba(0, 107, 232, 0.18), transparent 55%),
    radial-gradient(ellipse at 50% 100%, rgba(0, 212, 255, 0.12), transparent 60%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

/* ============ 通用组件 ============ */
.cs-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cs-accent-cyan);
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.28);
  border-radius: 999px;
  text-shadow: 0 0 12px rgba(0, 212, 255, 0.4);
}
.cs-eyebrow--center { align-self: center; }
.cs-eyebrow--light {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
  text-shadow: none;
}

.cs-text-grad {
  background: var(--cs-grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.cs-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: #fff;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease;
  white-space: nowrap;
}
.cs-btn:hover { transform: translateY(-2px); }
.cs-btn--primary {
  background: var(--cs-grad-primary);
  box-shadow: 0 14px 36px rgba(80, 36, 255, 0.36), inset 0 1px 0 rgba(255, 255, 255, 0.18);
}
.cs-btn--primary:hover {
  box-shadow: 0 22px 60px rgba(80, 36, 255, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.28);
}
.cs-btn--ghost {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
}
.cs-btn--ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.4);
}
.cs-btn--large { padding: 18px 36px; font-size: 16px; }
.cs-btn__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  font-size: 11px;
}

/* ============ 顶部导航 ============ */
.cs-topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 14px var(--cs-gutter-x);
  background: rgba(5, 0, 16, 0.65);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: background .3s ease, border-color .3s ease;
}
.cs-topbar.is-solid {
  background: rgba(5, 0, 16, 0.92);
  border-bottom-color: rgba(255, 255, 255, 0.1);
}
.cs-brand img { height: 32px; }
.cs-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}
.cs-nav a {
  font-size: 14px;
  color: var(--cs-text-dim);
  transition: color .2s ease;
  position: relative;
}
.cs-nav a:hover { color: #fff; }
.cs-nav a::after {
  content: "";
  position: absolute;
  left: 50%; bottom: -6px;
  transform: translateX(-50%) scaleX(0);
  width: 80%; height: 2px;
  background: var(--cs-grad-primary);
  border-radius: 999px;
  transition: transform .25s ease;
}
.cs-nav a:hover::after { transform: translateX(-50%) scaleX(1); }
.cs-topbar__cta {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  background: var(--cs-grad-primary);
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(80, 36, 255, 0.3);
  transition: transform .25s ease, box-shadow .25s ease;
}
.cs-topbar__cta:hover { transform: translateY(-1px); box-shadow: 0 12px 32px rgba(80, 36, 255, 0.45); }

.cs-mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px; height: 18px;
  background: transparent;
  border: 0;
  padding: 0;
}
.cs-mobile-toggle span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 999px;
  transition: transform .3s ease, opacity .3s ease;
}
.cs-mobile-toggle.is-open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.cs-mobile-toggle.is-open span:nth-child(2) { opacity: 0; }
.cs-mobile-toggle.is-open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

.cs-mobile-menu {
  position: fixed;
  top: 60px; left: 0; right: 0;
  z-index: 49;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px var(--cs-gutter-x) 24px;
  background: rgba(5, 0, 16, 0.96);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transform-origin: top center;
  animation: csDropIn .25s ease;
}
.cs-mobile-menu a {
  padding: 14px 12px;
  font-size: 15px;
  color: var(--cs-text-dim);
  border-radius: 12px;
}
.cs-mobile-menu a:hover { background: rgba(255, 255, 255, 0.05); color: #fff; }
.cs-mobile-menu__cta {
  margin-top: 8px;
  background: var(--cs-grad-primary);
  color: #fff !important;
  text-align: center;
  font-weight: 500;
}
@keyframes csDropIn {
  from { opacity: 0; transform: scaleY(0.96); }
  to   { opacity: 1; transform: scaleY(1); }
}

/* ============ Main 容器 ============ */
.cs-main { padding-top: 60px; }

.cs-section {
  position: relative;
  padding: clamp(80px, 12vw, 140px) var(--cs-gutter-x);
  max-width: var(--cs-max);
  margin: 0 auto;
}

.cs-section__head {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  text-align: center;
  margin-bottom: clamp(40px, 6vw, 64px);
}
.cs-section__title {
  margin: 0;
  font-size: clamp(32px, 4.4vw, 52px);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
}
.cs-section__desc {
  max-width: 720px;
  margin: 0;
  font-size: clamp(14px, 1.4vw, 16px);
  line-height: 1.8;
  color: var(--cs-text-dim);
}

/* ============ Hero ============ */
.cs-hero {
  position: relative;
  min-height: calc(100vh - 60px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(80px, 10vw, 140px) var(--cs-gutter-x) clamp(60px, 8vw, 100px);
  overflow: hidden;
}

.cs-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}
.cs-hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.7;
  animation: csOrbFloat 14s ease-in-out infinite;
}
.cs-hero__orb--violet {
  top: -10%; left: -8%;
  width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(80, 36, 255, 0.7) 0%, transparent 70%);
}
.cs-hero__orb--blue {
  top: 35%; right: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(0, 107, 232, 0.6) 0%, transparent 70%);
  animation-delay: -5s;
}
.cs-hero__orb--cyan {
  bottom: -15%; left: 30%;
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.5) 0%, transparent 70%);
  animation-delay: -9s;
}
@keyframes csOrbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%      { transform: translate(40px, -30px) scale(1.08); }
}

.cs-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(120, 100, 200, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 100, 200, 0.08) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 80%);
  opacity: 0.6;
}

.cs-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--cs-max);
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 28px;
}

.cs-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cs-text-dim);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  backdrop-filter: blur(6px);
}
.cs-hero__badge-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--cs-accent-cyan);
  box-shadow: 0 0 14px var(--cs-accent-cyan);
  animation: csPulseDot 1.6s ease-in-out infinite;
}
@keyframes csPulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.4; transform: scale(0.7); }
}

.cs-hero__title {
  margin: 0;
  font-size: clamp(56px, 11vw, 168px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.02em;
}
.cs-hero__title-row { display: block; }
.cs-hero__title-row--accent {
  background: var(--cs-grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-left: clamp(40px, 6vw, 80px);
}

.cs-hero__subtitle {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 30px);
  letter-spacing: 0.4em;
  color: var(--cs-text-dim);
  font-weight: 300;
}

.cs-hero__desc {
  max-width: 640px;
  margin: 0;
  font-size: clamp(14px, 1.3vw, 16px);
  line-height: 2;
  color: var(--cs-text-dim);
}

.cs-hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.cs-hero__meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 40px);
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--cs-line);
  width: 100%;
}
.cs-hero__meta-item { display: flex; flex-direction: column; gap: 6px; }
.cs-hero__meta-item strong {
  font-size: clamp(28px, 3.6vw, 44px);
  font-weight: 600;
  background: var(--cs-grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
}
.cs-hero__meta-item strong span {
  font-size: 0.6em;
  margin-left: 2px;
}
.cs-hero__meta-label {
  font-size: 12px;
  color: var(--cs-text-mute);
  letter-spacing: 0.1em;
}

.cs-hero__scroll {
  position: absolute;
  bottom: 32px; left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--cs-text-mute);
}
.cs-hero__scroll-bar {
  width: 1px; height: 40px;
  background: linear-gradient(180deg, transparent, var(--cs-accent-cyan), transparent);
  animation: csScrollLine 2s ease-in-out infinite;
}
@keyframes csScrollLine {
  0%, 100% { transform: translateY(0); opacity: 0.6; }
  50%      { transform: translateY(10px); opacity: 1; }
}

/* ============ 视频区 ============ */
.cs-video-section { padding-top: clamp(60px, 8vw, 100px); }
.cs-video-wrap {
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
  aspect-ratio: 16 / 9;
  border-radius: var(--cs-radius-lg);
  overflow: hidden;
  background: #000;
  box-shadow: var(--cs-shadow-glow);
}
.cs-video {
  width: 100%; height: 100%;
  display: block;
  background: #000;
  outline: none;
}
.cs-video__overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  background: linear-gradient(180deg, rgba(0,0,0,0) 30%, rgba(0,0,0,0.4) 100%);
  border: 0;
  color: #fff;
  transition: opacity .3s ease;
}
.cs-video__overlay.is-hidden { opacity: 0; pointer-events: none; }
.cs-video__play-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 96px; height: 96px;
  border-radius: 50%;
  background: var(--cs-grad-primary);
  box-shadow: 0 0 0 0 rgba(80, 36, 255, 0.6);
  color: #fff;
  padding-left: 6px;
  transition: transform .3s ease;
  animation: csPulseBtn 2.4s ease-in-out infinite;
}
.cs-video__overlay:hover .cs-video__play-btn { transform: scale(1.08); }
@keyframes csPulseBtn {
  0%   { box-shadow: 0 0 0 0 rgba(80, 36, 255, 0.5); }
  70%  { box-shadow: 0 0 0 24px rgba(80, 36, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(80, 36, 255, 0); }
}
.cs-video__hint {
  font-size: 14px;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.85);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
}
.cs-video__frame {
  position: absolute;
  inset: -1px;
  border-radius: var(--cs-radius-lg);
  padding: 1px;
  background: var(--cs-grad-border);
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

/* ============ 计划溯源 ============ */
.cs-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: clamp(40px, 6vw, 80px);
  align-items: start;
}
.cs-origin__left { display: flex; flex-direction: column; gap: 24px; }
.cs-origin__title {
  margin: 0;
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.02em;
  background: var(--cs-grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.cs-origin__right { display: flex; flex-direction: column; gap: 22px; }
.cs-origin__lead {
  margin: 0;
  font-size: clamp(16px, 1.6vw, 20px);
  line-height: 1.85;
  color: var(--cs-text);
  font-weight: 400;
  padding: 24px 28px;
  background: var(--cs-surface);
  border-left: 3px solid var(--cs-accent-cyan);
  border-radius: 0 var(--cs-radius) var(--cs-radius) 0;
}
.cs-origin__body {
  margin: 0;
  font-size: 15px;
  line-height: 2;
  color: var(--cs-text-dim);
}
.cs-origin__body em {
  font-style: normal;
  font-weight: 500;
  color: var(--cs-accent-cyan);
  text-shadow: 0 0 12px rgba(0, 212, 255, 0.4);
}

/* ============ 理念内核 ============ */
.cs-creed { text-align: center; }
.cs-creed__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}
.cs-creed__title {
  margin: 0;
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.cs-slogan {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 24px 0;
}
.cs-slogan__row {
  font-size: clamp(40px, 6vw, 80px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.06em;
  transition: all .35s ease;
}
.cs-slogan__row:hover {
  background: var(--cs-grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  transform: translateX(8px);
}
.cs-slogan__row span {
  display: inline-block;
  width: 1.2em;
  background: var(--cs-grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 800;
}
.cs-creed__caption {
  max-width: 720px;
  margin: 0;
  font-size: 16px;
  line-height: 2;
  color: var(--cs-text-dim);
}
.cs-creed__quote {
  max-width: 820px;
  margin: 16px 0 0;
  padding: 28px 32px;
  font-size: 15px;
  line-height: 2;
  color: var(--cs-text-dim);
  background: var(--cs-surface);
  border-radius: var(--cs-radius);
  border: 1px solid var(--cs-line);
  text-align: left;
}
.cs-creed__quote strong { color: #fff; font-weight: 500; }

/* ============ 四维赋能 ============ */
.cs-pillars__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}
.cs-pillar {
  position: relative;
  padding: 36px 32px;
  background: var(--cs-surface);
  border: 1px solid var(--cs-line);
  border-radius: var(--cs-radius-lg);
  overflow: hidden;
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.cs-pillar::before {
  content: "";
  position: absolute;
  top: -40%; right: -20%;
  width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(80, 36, 255, 0.2), transparent 70%);
  opacity: 0;
  transition: opacity .4s ease;
  pointer-events: none;
}
.cs-pillar:hover {
  transform: translateY(-4px);
  border-color: var(--cs-line-strong);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4), 0 0 40px rgba(80, 36, 255, 0.15);
}
.cs-pillar:hover::before { opacity: 1; }

.cs-pillar__head {
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--cs-line);
}
.cs-pillar__num {
  display: inline-block;
  font-family: "Inter", monospace;
  font-size: 36px;
  font-weight: 700;
  background: var(--cs-grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.02em;
}
.cs-pillar__head h3 {
  margin: 4px 0 8px;
  font-size: 26px;
  font-weight: 600;
}
.cs-pillar__tagline {
  margin: 0;
  font-size: 13px;
  color: var(--cs-text-mute);
  letter-spacing: 0.06em;
}
.cs-pillar__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.cs-pillar__list li {
  position: relative;
  padding-left: 20px;
}
.cs-pillar__list li::before {
  content: "";
  position: absolute;
  left: 0; top: 9px;
  width: 8px; height: 8px;
  background: var(--cs-grad-primary);
  border-radius: 2px;
  transform: rotate(45deg);
}
.cs-pillar__list strong {
  display: block;
  font-size: 15px;
  font-weight: 500;
  color: #fff;
  margin-bottom: 4px;
}
.cs-pillar__list p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--cs-text-dim);
}

/* ============ 腾青AI 的角色 ============ */
.cs-role__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}
.cs-role__card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 28px 24px;
  background: var(--cs-surface);
  border: 1px solid var(--cs-line);
  border-radius: var(--cs-radius);
  transition: transform .3s ease, border-color .3s ease;
  position: relative;
  overflow: hidden;
}
.cs-role__card:hover {
  transform: translateY(-4px);
  border-color: var(--cs-accent-cyan);
}
.cs-role__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px; height: 56px;
  border-radius: 14px;
  background: var(--cs-grad-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
  box-shadow: 0 8px 24px rgba(80, 36, 255, 0.4);
}
.cs-role__card h4 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}
.cs-role__card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--cs-text-dim);
}

/* ============ 行业成效数字墙 ============ */
.cs-impact__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--cs-line);
  border: 1px solid var(--cs-line);
  border-radius: var(--cs-radius-lg);
  overflow: hidden;
}
.cs-impact__cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 48px 24px;
  background: var(--cs-bg-soft);
  text-align: center;
  transition: background .3s ease;
}
.cs-impact__cell:hover { background: rgba(80, 36, 255, 0.08); }
.cs-impact__num {
  font-size: clamp(48px, 6vw, 80px);
  font-weight: 700;
  background: var(--cs-grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
  font-family: "Inter", "PingFang SC", sans-serif;
  letter-spacing: -0.02em;
}
.cs-impact__tag {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cs-accent-cyan);
}
.cs-impact__label {
  font-size: 15px;
  color: var(--cs-text-dim);
}

/* ============ 报名 CTA ============ */
.cs-join { padding: clamp(60px, 8vw, 100px) var(--cs-gutter-x); }
.cs-join__inner {
  position: relative;
  padding: clamp(60px, 8vw, 100px) clamp(30px, 6vw, 80px);
  border-radius: var(--cs-radius-lg);
  overflow: hidden;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}
.cs-join__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(80, 36, 255, 0.55), transparent 60%),
    radial-gradient(ellipse at 70% 50%, rgba(0, 107, 232, 0.55), transparent 60%),
    linear-gradient(135deg, rgba(80, 36, 255, 0.18), rgba(0, 107, 232, 0.18));
}
.cs-join__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
}
.cs-join__title {
  margin: 0;
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 600;
  line-height: 1.2;
  position: relative;
  z-index: 1;
}
.cs-join__desc {
  max-width: 680px;
  margin: 0;
  font-size: clamp(14px, 1.4vw, 16px);
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.85);
  position: relative;
  z-index: 1;
}
.cs-join__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  position: relative;
  z-index: 1;
  margin-top: 12px;
}

/* ============ 资料下载 ============ */
.cs-download__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
  padding: 40px clamp(30px, 4vw, 60px);
  background: var(--cs-surface);
  border: 1px solid var(--cs-line);
  border-radius: var(--cs-radius-lg);
  flex-wrap: wrap;
}
.cs-download__left { display: flex; flex-direction: column; gap: 10px; max-width: 600px; }
.cs-download__left h3 { margin: 0; font-size: 22px; font-weight: 500; }
.cs-download__left p { margin: 0; font-size: 14px; line-height: 1.8; color: var(--cs-text-dim); }
.cs-download__actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ============ Footer ============ */
.cs-footer {
  border-top: 1px solid var(--cs-line);
  padding: 40px var(--cs-gutter-x);
  background: rgba(5, 0, 16, 0.6);
}
.cs-footer__inner {
  max-width: var(--cs-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 32px;
  align-items: center;
}
.cs-footer__brand { display: flex; align-items: center; gap: 14px; }
.cs-footer__brand img { width: 44px; height: 44px; border-radius: 10px; }
.cs-footer__brand strong { display: block; font-size: 15px; }
.cs-footer__brand span { font-size: 12px; color: var(--cs-text-mute); }
.cs-footer__company { display: flex; flex-direction: column; gap: 4px; }
.cs-footer__company strong { font-size: 15px; font-weight: 500; }
.cs-footer__company span { font-size: 12px; color: var(--cs-text-mute); letter-spacing: 0.04em; }
.cs-footer__links { display: flex; gap: 24px; }
.cs-footer__links a { font-size: 14px; color: var(--cs-text-dim); transition: color .2s ease; }
.cs-footer__links a:hover { color: #fff; }
.cs-footer__meta { font-size: 12px; line-height: 1.8; color: var(--cs-text-mute); text-align: right; }

/* ============ Reveal 动画 ============ */
[data-cs-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .8s ease, transform .8s ease;
}
[data-cs-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============ 响应式 ============ */
@media (max-width: 980px) {
  .cs-hero__title-row--accent { margin-left: 0; }

  .cs-hero__meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .cs-origin__grid { grid-template-columns: 1fr; }
  .cs-pillars__grid { grid-template-columns: 1fr; }
  .cs-role__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cs-impact__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .cs-footer__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .cs-footer__brand { justify-content: center; }
  .cs-footer__links { justify-content: center; }
  .cs-footer__meta { text-align: center; }
}

@media (max-width: 640px) {
  .cs-topbar { gap: 12px; padding: 12px 16px; }
  .cs-topbar__cta { padding: 8px 16px; font-size: 12px; }
  .cs-brand img { height: 28px; }
  .cs-hero__meta { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cs-role__grid { grid-template-columns: 1fr; }
  .cs-impact__grid { grid-template-columns: 1fr; }

  .cs-download__inner { flex-direction: column; align-items: stretch; text-align: center; }
  .cs-download__actions { justify-content: center; }

  .cs-slogan__row { font-size: 36px; letter-spacing: 0.04em; }
  .cs-hero__title { font-size: 64px; }
  .cs-hero__subtitle { letter-spacing: 0.2em; }

  .cs-video__play-btn { width: 72px; height: 72px; }
  .cs-video__play-btn svg { width: 32px; height: 32px; }

  .cs-hero__scroll { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}