/* ===================================================================
   千序言 · 全局样式
   适配：手机优先，平板、PC、大屏
   视觉：深色科技风 · 文化金 + AI 青
   =================================================================== */

:root {
  --bg:           #020617;
  --bg-2:         #0a1428;
  --bg-3:         #0f172a;
  --panel:        rgba(255,255,255,0.04);
  --panel-border: rgba(255,255,255,0.10);
  --text:         #f1f5f9;
  --text-dim:     #cbd5e1;
  --text-muted:   #94a3b8;

  --brand:        #22d3ee;     /* AI 青 */
  --brand-2:      #67e8f9;
  --brand-3:      #06b6d4;
  --gold:         #fbbf24;     /* 文化金 */
  --gold-2:       #fde68a;
  --gold-3:       #d97706;
  --purple:       #a78bfa;
  --pink:         #f472b6;
  --green:        #34d399;

  --gradient:     linear-gradient(135deg, #22d3ee 0%, #a78bfa 50%, #fbbf24 100%);
  --gradient-2:   linear-gradient(135deg, #fbbf24 0%, #22d3ee 100%);
  --gradient-text:linear-gradient(135deg, #22d3ee 0%, #fbbf24 100%);

  --radius:       18px;
  --radius-sm:    12px;
  --shadow:       0 8px 32px rgba(2,6,23,.55);

  --font-sans:    'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono:    'JetBrains Mono', 'Consolas', monospace;
  --font-num:     'Orbitron', sans-serif;
}

/* ----- Reset ----- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
}
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(34,211,238,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34,211,238,.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
  pointer-events: none; z-index: 0;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
h1,h2,h3,h4,h5 { font-weight: 800; line-height: 1.2; margin: 0; letter-spacing: -.02em; }
p { margin: 0; }
b, strong { font-weight: 700; }
.gold     { color: var(--gold); }
.accent   { color: var(--brand); }
.cyan     { color: var(--brand-2); }
.purple   { color: var(--purple); }

/* ----- Container ----- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative; z-index: 2;
}

/* ----- 滚动进度条 ----- */
.scroll-progress {
  position: fixed; top: 0; left: 0;
  width: 0%; height: 2px;
  background: var(--gradient);
  z-index: 9999;
  transition: width .1s linear;
}

/* ----- 导航 ----- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  padding: 14px 0;
  z-index: 100;
  transition: all .3s ease;
  backdrop-filter: blur(14px);
  background: rgba(2,6,23,.65);
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  padding: 10px 0;
  background: rgba(2,6,23,.85);
  border-bottom-color: var(--panel-border);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1320px; margin: 0 auto; padding: 0 24px;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  position: relative;
}
.brand-halo {
  position: absolute;
  left: -8px; top: 50%;
  transform: translateY(-50%);
  width: 64px; height: 64px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(34,211,238,.25) 0%, transparent 70%);
  z-index: -1;
  animation: halo 3s ease-in-out infinite;
}
@keyframes halo {
  0%, 100% { transform: translateY(-50%) scale(1); opacity: .6; }
  50%      { transform: translateY(-50%) scale(1.15); opacity: .9; }
}
.brand img {
  height: 42px; width: auto;
  filter: drop-shadow(0 0 10px rgba(34,211,238,.5));
  transition: transform .4s;
}
.brand:hover img { transform: rotate(-6deg) scale(1.05); }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text b {
  font-weight: 800; font-size: 1rem; letter-spacing: 1px;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.brand-text small { font-size: .65rem; color: var(--text-muted); letter-spacing: 1.5px; }

.nav-links { display: flex; gap: 30px; align-items: center; }
.nav-links a {
  font-size: .92rem; color: var(--text-dim); transition: color .25s;
  position: relative; font-weight: 500;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 50%;
  width: 0; height: 2px; background: var(--gradient);
  transform: translateX(-50%); transition: width .3s;
}
.nav-links a:hover { color: var(--brand-2); }
.nav-links a:hover::after { width: 100%; }
.nav-cta {
  padding: 8px 16px; border-radius: 30px;
  background: linear-gradient(135deg, rgba(34,211,238,.15), rgba(167,139,250,.15));
  border: 1px solid rgba(34,211,238,.4);
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .85rem !important; font-weight: 600;
  color: var(--brand-2) !important;
}
.nav-cta:hover { background: linear-gradient(135deg, rgba(34,211,238,.25), rgba(167,139,250,.25)); }
.cta-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 8px #22c55e;
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1 } 50% { opacity: .3 } }

.menu-toggle {
  display: none;
  background: transparent; border: 0;
  width: 36px; height: 36px;
  position: relative;
  flex-direction: column; justify-content: center; gap: 5px;
}
.menu-toggle span {
  width: 22px; height: 2px; background: var(--text);
  border-radius: 2px; margin: 0 auto;
  transition: all .3s;
}
.menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端菜单 */
.mobile-menu {
  position: fixed; inset: 0;
  background: rgba(2,6,23,.97);
  backdrop-filter: blur(20px);
  z-index: 99;
  display: flex; flex-direction: column;
  justify-content: center; align-items: center; gap: 28px;
  opacity: 0; pointer-events: none;
  transition: opacity .3s;
}
.mobile-menu.open { opacity: 1; pointer-events: auto; }
.mobile-menu a {
  font-size: 1.4rem; color: var(--text);
  font-weight: 600;
}
.mobile-menu a:hover { color: var(--brand-2); }
.mobile-cta {
  margin-top: 12px; padding: 14px 28px;
  background: var(--gradient);
  color: #001018 !important; border-radius: 30px;
  font-size: 1.05rem !important;
}

/* ----- Section 公用 ----- */
section {
  padding: 80px 0;
  position: relative;
}
.eyebrow {
  display: inline-block;
  font-size: .8rem; letter-spacing: 3px;
  color: var(--brand-2);
  text-transform: uppercase;
  font-weight: 700;
  padding: 6px 14px;
  border: 1px solid rgba(34,211,238,.3);
  border-radius: 30px;
  background: rgba(34,211,238,.05);
}
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 16px 0 14px;
  font-weight: 900;
  letter-spacing: -1px;
}
.section-sub {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 720px;
  margin-bottom: 50px;
}

/* ----- 通用按钮 ----- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 26px;
  border-radius: 30px;
  font-weight: 700;
  font-size: .95rem;
  transition: all .3s;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: var(--gradient);
  color: #001018;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(34,211,238,.35); }
.btn-primary::after {
  content: '';
  position: absolute; top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.4), transparent);
  transition: left .6s;
}
.btn-primary:hover::after { left: 100%; }
.btn-outline {
  border-color: var(--panel-border);
  color: var(--text);
}
.btn-outline:hover {
  border-color: var(--brand-2);
  background: rgba(34,211,238,.08);
}
.btn-block { width: 100%; justify-content: center; }

/* ----- Hero ----- */
.hero {
  padding: 130px 0 80px;
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.hero-bg-text {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-size: clamp(20rem, 50vw, 60rem);
  font-weight: 900; line-height: 0.8;
  letter-spacing: -0.05em;
  background: linear-gradient(180deg, rgba(34,211,238,.08) 0%, rgba(251,191,36,.05) 50%, transparent 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  pointer-events: none; user-select: none; z-index: -1;
  white-space: nowrap;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
}
.hero-content h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  line-height: 1.18;
  margin: 18px 0 22px;
  font-weight: 900;
}
.hero-content h1 .gold,
.hero-content h1 .accent,
.hero-content h1 .purple,
.hero-content h1 .cyan {
  position: relative;
  display: inline-block;
}
.hero-content h1 .gold::after,
.hero-content h1 .accent::after,
.hero-content h1 .purple::after,
.hero-content h1 .cyan::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 3px;
  border-radius: 2px;
}
.hero-content h1 .gold::after    { background: var(--gradient-2); }
.hero-content h1 .accent::after  { background: linear-gradient(90deg, var(--brand), var(--brand-2)); }
.hero-content h1 .purple::after { background: linear-gradient(90deg, var(--purple), var(--pink)); }
.hero-content h1 .cyan::after   { background: linear-gradient(90deg, var(--brand-2), var(--green)); }

.lead {
  font-size: 1.05rem;
  color: var(--text-dim);
  max-width: 540px;
  line-height: 1.85;
}
.lead strong { color: var(--text); font-weight: 700; }
.hero-actions {
  display: flex; gap: 14px; flex-wrap: wrap;
  margin-top: 32px;
}

/* Hero 数据条 */
.hero-stats {
  display: flex; align-items: center;
  gap: 14px; flex-wrap: wrap;
  margin-top: 36px;
  padding: 16px 22px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 30px;
  backdrop-filter: blur(10px);
  width: max-content; max-width: 100%;
}
.stat-pill {
  display: flex; flex-direction: column;
  line-height: 1;
}
.stat-pill b {
  font-family: var(--font-num);
  font-size: 1.4rem; font-weight: 800;
  color: var(--brand-2);
  letter-spacing: .5px;
}
.stat-pill span {
  font-size: .72rem;
  color: var(--text-muted);
  margin-top: 4px;
}
.stat-sep {
  width: 1px; height: 30px;
  background: var(--panel-border);
}

/* Hero 右侧视觉 */
.hero-visual {
  position: relative;
  display: flex; align-items: center; justify-content: center;
  min-height: 460px;
}
.orbit {
  position: absolute;
  width: 420px; height: 420px;
  border-radius: 50%;
  border: 1px solid rgba(34,211,238,.2);
  animation: rotate 20s linear infinite;
}
.orbit::before, .orbit::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  border-style: dashed;
}
.orbit::before {
  inset: 60px;
  border-color: rgba(251,191,36,.3);
  animation: rotate 15s linear infinite reverse;
}
.orbit::after {
  inset: 130px;
  border-color: rgba(167,139,250,.25);
  animation: rotate 25s linear infinite;
}
.orbit-dot {
  position: absolute;
  top: -6px; left: 50%;
  transform: translateX(-50%);
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--brand-2);
  box-shadow: 0 0 16px var(--brand-2);
}
@keyframes rotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.hero-card {
  position: relative;
  background: linear-gradient(135deg, rgba(34,211,238,.1), rgba(251,191,36,.05));
  border: 1px solid rgba(34,211,238,.3);
  border-radius: var(--radius);
  padding: 28px;
  width: 320px;
  backdrop-filter: blur(14px);
  z-index: 2;
  text-decoration: none; color: inherit;
  display: block;
}
.hero-card .tag {
  display: inline-block;
  font-size: .7rem; font-weight: 700;
  padding: 4px 12px;
  background: rgba(251,191,36,.2);
  color: var(--gold-2);
  border-radius: 20px;
  letter-spacing: 1px;
}
.hero-card h3 {
  font-size: 1.5rem; margin: 12px 0 8px;
  color: var(--text);
}
.hero-card .desc {
  font-size: .85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.hero-card .stat-row {
  display: flex; gap: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--panel-border);
}
.hero-card .stat b {
  display: block;
  font-family: var(--font-num);
  font-size: 1.3rem;
  color: var(--brand-2);
  font-weight: 800;
}
.hero-card .stat span {
  font-size: .7rem;
  color: var(--text-muted);
}

.mini-card {
  position: absolute;
  background: rgba(15,23,42,.9);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  display: flex; align-items: center; gap: 10px;
  font-size: .85rem;
  backdrop-filter: blur(10px);
  z-index: 3;
  text-decoration: none; color: inherit;
  transition: all .3s;
}
.mini-card .icon {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  background: rgba(34,211,238,.15);
  border-radius: 8px; font-size: 1.1rem;
}
.mini-card b {
  display: block;
  font-size: .9rem;
  color: var(--text);
}
.mini-card span:not(.visit-tag-mini) {
  font-size: .72rem;
  color: var(--text-muted);
}
.mini-card.b1 { top: 5%;  left: -10%; animation: float 4s ease-in-out infinite; }
.mini-card.b2 { bottom: 8%; right: -10%; animation: float 4.5s ease-in-out infinite 1s; }
.mini-card.b3 { bottom: 30%; left: -14%; animation: float 5s ease-in-out infinite .5s; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-12px); }
}

/* VISIT 标签 */
.visit-tag {
  position: absolute;
  top: 12px; right: 12px;
  padding: 4px 10px;
  font-size: .7rem; font-weight: 700;
  background: var(--brand-2);
  color: #001018;
  border-radius: 20px;
  opacity: 0;
  transform: translateY(-4px);
  transition: all .25s;
  pointer-events: none;
  letter-spacing: 1px;
}
.visit-tag-mini {
  top: 6px; right: 6px;
  font-size: .6rem;
  padding: 3px 7px;
}
a.cap-card:hover .visit-tag,
a.case-card:hover .visit-tag,
a.hero-card:hover .visit-tag,
a.sub-product:hover .visit-tag,
a.loop-step:hover .visit-tag,
a.mini-card:hover .visit-tag-mini {
  opacity: 1;
  transform: translateY(0);
}

/* Hero 装饰边线 */
.hero-corner-decor {
  position: absolute;
  width: 60px; height: 60px;
  pointer-events: none;
  display: none;
}
.hero-corner-decor-tl {
  top: 10px; left: 10px;
  border-top: 2px solid var(--brand-2);
  border-left: 2px solid var(--brand-2);
}
.hero-corner-decor-br {
  bottom: 10px; right: 10px;
  border-bottom: 2px solid var(--gold);
  border-right: 2px solid var(--gold);
}

/* Hero 左右侧装饰（PC 端） */
.hero-side-decor {
  position: absolute;
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  z-index: 1;
}
.hero-side-decor-left  { left: -20px; }
.hero-side-decor-right { right: -20px; }
.hero-side-decor .line {
  width: 30px; height: 1px;
  background: var(--gradient);
}
.hero-side-decor .vline {
  width: 1px; height: 40px;
  background: linear-gradient(180deg, transparent, var(--brand-2), transparent);
}
.hero-side-decor .v-text {
  writing-mode: vertical-rl;
  font-size: .75rem; letter-spacing: 4px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}
.hero-side-decor .v-text-2 {
  color: var(--brand-2);
  font-weight: 700;
}
.hero-side-decor .badge-pill {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: .75rem; font-weight: 700;
  letter-spacing: 1px;
  font-family: var(--font-mono);
}
.badge-pill-cyan { background: rgba(34,211,238,.15); color: var(--brand-2); border: 1px solid rgba(34,211,238,.4); }
.badge-pill-gold { background: rgba(251,191,36,.15); color: var(--gold-2); border: 1px solid rgba(251,191,36,.4); }

/* 滚动指示器 */
.scroll-indicator {
  position: absolute;
  bottom: 24px;
  left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column;
  align-items: center; gap: 6px;
  color: var(--text-muted);
  font-size: .7rem; letter-spacing: 2px;
  pointer-events: none;
}
.mouse {
  width: 22px; height: 36px;
  border: 1.5px solid var(--text-muted);
  border-radius: 12px;
  position: relative;
}
.wheel {
  width: 3px; height: 6px;
  background: var(--brand-2);
  border-radius: 2px;
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  animation: wheel 1.6s ease-in-out infinite;
}
@keyframes wheel {
  0%   { opacity: 1; transform: translate(-50%, 0); }
  100% { opacity: 0; transform: translate(-50%, 12px); }
}

/* ----- 关于 ----- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-text p {
  font-size: 1rem;
  color: var(--text-dim);
  margin-bottom: 16px;
}
.about-text strong { color: var(--text); font-weight: 700; }

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 30px;
}
.feature-item {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  padding: 16px;
  transition: all .3s;
}
.feature-item:hover {
  border-color: var(--brand-2);
  background: rgba(34,211,238,.05);
  transform: translateY(-3px);
}
.feature-item .icon {
  font-size: 1.5rem;
  margin-bottom: 6px;
}
.feature-item h4 {
  font-size: .95rem;
  color: var(--text);
  margin-bottom: 4px;
}
.feature-item p {
  font-size: .8rem;
  color: var(--text-muted);
  margin: 0;
}

/* 闭环卡片 */
.loop-card {
  background: linear-gradient(135deg, rgba(34,211,238,.08), rgba(167,139,250,.05));
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 24px;
  backdrop-filter: blur(12px);
}
.loop-card-head {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--panel-border);
}
.loop-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--brand-2);
  box-shadow: 0 0 12px var(--brand-2);
}
.loop-card-head b {
  font-size: 1.1rem;
  color: var(--text);
}
.loop-tag {
  margin-left: auto;
  font-size: .7rem;
  padding: 3px 10px;
  background: rgba(34,211,238,.15);
  color: var(--brand-2);
  border-radius: 20px;
  font-weight: 700;
}
.loop-step {
  display: flex; align-items: center; gap: 14px;
  padding: 14px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,.03);
  border: 1px solid var(--panel-border);
  margin-bottom: 8px;
  text-decoration: none; color: inherit;
  position: relative;
  transition: all .3s;
}
.loop-step:last-of-type { margin-bottom: 0; }
.loop-step:hover {
  background: rgba(255,255,255,.06);
  transform: translateX(4px);
  border-color: var(--c, var(--brand-2));
}
.loop-num {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c, var(--brand-2)), transparent);
  display: grid; place-items: center;
  color: var(--c, var(--brand-2));
  font-weight: 900;
  font-family: var(--font-num);
  font-size: .95rem;
  flex-shrink: 0;
  border: 1px solid var(--c, var(--brand-2));
}
.loop-step .info b {
  display: block;
  font-size: .98rem;
  color: var(--text);
}
.loop-step .info span {
  font-size: .78rem;
  color: var(--text-muted);
}
.loop-step .arrow {
  margin-left: auto;
  color: var(--text-muted);
  font-size: 1.1rem;
  transition: all .25s;
}
.loop-step:hover .arrow { color: var(--c, var(--brand-2)); transform: translateX(4px); }
.loop-connector {
  width: 2px; height: 16px;
  margin: 0 auto 8px;
  background: rgba(34,211,238,.2);
}

/* ----- 双主线 ----- */
.pillars-section {
  background: rgba(255,255,255,0.01);
}
.pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}
.pillar {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 32px;
  position: relative;
  overflow: hidden;
  transition: all .3s;
}
.pillar::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 2px;
  background: var(--gradient);
  transition: left .4s;
}
.pillar:hover { border-color: var(--brand-2); transform: translateY(-4px); }
.pillar:hover::before { left: 0; }
.pillar .badge {
  display: inline-block;
  font-size: .75rem; font-weight: 700;
  letter-spacing: 1px;
  padding: 4px 12px;
  background: rgba(255,255,255,.05);
  border-radius: 20px;
  margin-bottom: 16px;
}
.pillar h3 {
  font-size: 1.6rem;
  margin-bottom: 8px;
  color: var(--text);
}
.pillar .desc {
  font-size: .92rem;
  color: var(--text-muted);
  margin-bottom: 22px;
}

.sub-products {
  display: flex; flex-direction: column;
  gap: 8px;
}
.sub-product {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,.03);
  border: 1px solid var(--panel-border);
  text-decoration: none; color: inherit;
  position: relative;
  transition: all .3s;
}
.sub-product:hover {
  background: rgba(255,255,255,.06);
  transform: translateX(4px);
  border-color: var(--c, var(--brand-2));
}
.sub-product .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 8px currentColor;
}
.sub-product .info {
  flex: 1;
  min-width: 0;
}
.sub-product .info b {
  display: block;
  font-size: .92rem;
  color: var(--text);
}
.sub-product .info span {
  font-size: .75rem;
  color: var(--text-muted);
}
.sub-product .arrow {
  color: var(--text-muted);
  font-size: 1rem;
  transition: all .25s;
}
.sub-product:hover .arrow { color: var(--c, var(--brand-2)); transform: translateX(4px); }
.sub-product:hover .arrow { display: none; }

/* ----- 服务能力 ----- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.cap-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 26px;
  text-decoration: none; color: inherit;
  display: block;
  overflow: hidden;
  transition: all .3s;
}
.cap-card::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 2px;
  background: var(--gradient);
  transition: left .4s;
}
.cap-card:hover {
  border-color: var(--brand-2);
  background: linear-gradient(135deg, rgba(34,211,238,.08), rgba(167,139,250,.04));
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}
.cap-card:hover::before { left: 0; }
.cap-card .num {
  position: absolute;
  top: 14px; right: 20px;
  font-family: var(--font-num);
  font-size: 2.4rem; font-weight: 900;
  color: rgba(34,211,238,.15);
  letter-spacing: -1px;
}
.cap-card .icon-wrap {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  font-size: 1.6rem;
  background: rgba(34,211,238,.1);
  border-radius: 12px;
  margin-bottom: 14px;
}
.cap-card h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--text);
}
.cap-card p {
  font-size: .85rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ----- 数据条 ----- */
.stats-section {
  background:
    radial-gradient(ellipse at top, rgba(34,211,238,.1), transparent 60%),
    radial-gradient(ellipse at bottom, rgba(251,191,36,.08), transparent 60%);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}
.data-item {
  text-align: center;
  padding: 24px;
}
.data-item b {
  display: block;
  font-family: var(--font-num);
  font-size: 2.6rem; font-weight: 900;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1px;
  margin-bottom: 8px;
}
.data-item span {
  font-size: .88rem;
  color: var(--text-muted);
}

/* ----- 案例 ----- */
.cases-section {
  background: rgba(255,255,255,0.01);
}
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.case-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 28px;
  min-height: 280px;
  display: flex; flex-direction: column;
  text-decoration: none; color: inherit;
  overflow: hidden;
  transition: all .3s;
}
.case-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(34,211,238,.05), transparent);
  opacity: 0;
  transition: opacity .3s;
  pointer-events: none;
}
.case-card:hover { transform: translateY(-6px); border-color: var(--brand-2); box-shadow: var(--shadow); }
.case-card:hover::after { opacity: 1; }
.case-tag {
  display: inline-block;
  font-size: .72rem; font-weight: 700;
  padding: 4px 12px;
  background: rgba(34,211,238,.15);
  color: var(--brand-2);
  border-radius: 20px;
  margin-bottom: 14px;
  align-self: flex-start;
}
.case-num {
  position: absolute;
  top: 24px; right: 24px;
  font-family: var(--font-num);
  font-size: 2rem; font-weight: 900;
  color: rgba(255,255,255,.08);
}
.case-body { margin-top: auto; position: relative; z-index: 1; }
.case-body h4 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}
.case-body p {
  font-size: .85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.case-cta {
  font-size: .85rem;
  color: var(--brand-2);
  font-weight: 600;
  transition: transform .25s;
  display: inline-block;
}
.case-card:hover .case-cta { transform: translateX(4px); }

/* ----- 联系 ----- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}
.contact-info, .contact-form {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 32px;
  backdrop-filter: blur(10px);
}
.contact-info h3, .contact-form h3 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}
.contact-lead {
  font-size: .92rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.contact-row {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 0;
  border-top: 1px solid var(--panel-border);
}
.contact-row .icon {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  background: rgba(34,211,238,.1);
  border-radius: 10px;
  font-size: 1rem;
  flex-shrink: 0;
}
.contact-row b {
  display: block;
  font-size: .78rem;
  color: var(--text-muted);
  font-weight: 500;
}
.contact-row span {
  color: var(--text);
  font-size: .95rem;
  font-weight: 600;
}
.product-links a {
  color: var(--brand-2);
  transition: color .25s;
  font-size: .92rem;
}
.product-links a:hover { color: var(--gold-2); }
.product-links .sep { color: var(--text-muted); margin: 0 4px; }

/* 表单 */
.field { margin-bottom: 14px; }
.field label {
  display: block;
  font-size: .82rem;
  color: var(--text-dim);
  margin-bottom: 6px;
  font-weight: 500;
}
.field input, .field textarea {
  width: 100%;
  background: rgba(255,255,255,.04);
  border: 1px solid var(--panel-border);
  color: var(--text);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: .95rem;
  transition: border-color .25s, background .25s;
  min-height: 48px;
}
.field textarea { resize: vertical; min-height: 100px; }
.field input:focus, .field textarea:focus {
  outline: 0;
  border-color: var(--brand-2);
  background: rgba(34,211,238,.05);
}
.field input::placeholder, .field textarea::placeholder { color: var(--text-muted); }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.form-tip {
  font-size: .78rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 10px;
}
.form-msg {
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: .88rem;
}
.form-msg.ok {
  background: rgba(34,197,94,.1);
  border: 1px solid rgba(34,197,94,.3);
  color: #86efac;
}
.form-msg.err {
  background: rgba(239,68,68,.1);
  border: 1px solid rgba(239,68,68,.3);
  color: #fca5a5;
}

/* ----- Footer ----- */
.site-footer {
  background: rgba(0,0,0,.4);
  border-top: 1px solid var(--panel-border);
  padding: 60px 0 24px;
  margin-top: 60px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--panel-border);
}
.footer-brand .brand { margin-bottom: 12px; }
.footer-desc {
  font-size: .85rem;
  color: var(--text-muted);
  max-width: 320px;
}
.footer-col h5 {
  font-size: .85rem;
  color: var(--text);
  margin-bottom: 12px;
  letter-spacing: 1px;
}
.footer-col a {
  display: block;
  font-size: .85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  transition: color .25s;
}
.footer-col a:hover { color: var(--brand-2); }
.footer-bottom {
  display: flex; justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  font-size: .78rem;
  color: var(--text-muted);
}

/* ----- 移动端底部悬浮 CTA ----- */
.floating-cta {
  display: none;
  position: fixed;
  bottom: 18px; left: 16px; right: 16px;
  background: linear-gradient(135deg, #001018, #050d18);
  border: 1px solid rgba(34,211,238,.4);
  border-radius: 60px;
  padding: 8px 8px 8px 18px;
  align-items: center; justify-content: space-between;
  box-shadow: 0 12px 30px rgba(2,6,23,.6);
  backdrop-filter: blur(14px);
  z-index: 90;
  text-decoration: none; color: inherit;
  animation: slideUp .5s ease;
}
.floating-info b {
  display: block;
  font-size: .92rem;
  color: var(--text);
}
.floating-info span {
  font-size: .78rem;
  color: var(--brand-2);
  font-family: var(--font-mono);
}
.floating-btn {
  padding: 10px 18px;
  background: var(--gradient);
  color: #001018;
  border-radius: 30px;
  font-weight: 700;
  font-size: .88rem;
}
@keyframes slideUp {
  from { transform: translateY(100px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

/* ----- Reveal 动画 ----- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* ===================== 响应式 ===================== */

/* 平板 / 小屏 PC */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-side-decor { display: none !important; }
  .hero-corner-decor { display: block; }
  .orbit { width: 320px; height: 320px; }
  .orbit::before { inset: 40px; }
  .orbit::after { inset: 90px; }
  .hero-visual { min-height: 380px; }
  .hero-card { width: 280px; padding: 22px; }

  .about-grid, .pillars, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }

  .nav-links { display: none; }
  .menu-toggle { display: flex; }
}

/* 手机 */
@media (max-width: 640px) {
  section { padding: 60px 0; }
  .container { padding: 0 16px; }

  .hero { padding: 100px 0 60px; min-height: auto; }
  .hero-content h1 { font-size: 2rem; }
  .lead { font-size: .95rem; }
  .hero-actions .btn { padding: 10px 20px; font-size: .85rem; }
  .hero-stats { padding: 12px 16px; gap: 10px; }
  .stat-pill b { font-size: 1.15rem; }
  .stat-pill span { font-size: .65rem; }
  .hero-visual { min-height: 320px; }
  .orbit { width: 240px; height: 240px; }
  .orbit::before { inset: 30px; }
  .orbit::after { inset: 70px; }
  .hero-card { width: 240px; padding: 18px; }
  .hero-card h3 { font-size: 1.2rem; }
  .hero-card .stat-row { gap: 8px; padding-top: 10px; }
  .hero-card .stat b { font-size: 1rem; }
  .mini-card { padding: 8px 10px; font-size: .75rem; }
  .mini-card .icon { width: 26px; height: 26px; font-size: .9rem; }
  .mini-card b { font-size: .78rem; }
  .mini-card span:not(.visit-tag-mini) { display: none; }
  .mini-card.b1 { left: 0; }
  .mini-card.b2 { right: 0; }
  .mini-card.b3 { left: 0; }
  .scroll-indicator { display: none; }

  .feature-list { grid-template-columns: 1fr; }
  .feature-item { padding: 14px; }
  .feature-item .icon { font-size: 1.3rem; }

  .section-title { font-size: 1.7rem; }
  .section-sub { font-size: .9rem; margin-bottom: 36px; }

  .pillar { padding: 24px; }
  .pillar h3 { font-size: 1.3rem; }

  .cards-grid { grid-template-columns: 1fr; }
  .cap-card { padding: 20px; }
  .cap-card .num { font-size: 1.8rem; }

  .cases-grid { grid-template-columns: 1fr; }
  .case-card { min-height: 220px; padding: 22px; }

  .data-item b { font-size: 2rem; }

  .contact-info, .contact-form { padding: 22px; }
  .form-row { grid-template-columns: 1fr; }
  .field input, .field textarea { padding: 10px 12px; }

  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .footer-bottom { flex-direction: column; gap: 6px; }

  /* 显示悬浮 CTA */
  .floating-cta { display: flex; }
  .site-footer { padding-bottom: 90px; }
}

/* 大屏 PC 增强 */
@media (min-width: 1100px) and (max-width: 1399px) {
  .hero-side-decor { display: flex; }
  .hero-corner-decor { display: block; }
}
@media (min-width: 1400px) {
  .container { max-width: 1320px; }
  .hero h1 { font-size: 4rem; }
  .orbit { width: 480px; height: 480px; }
  .orbit::before { inset: 70px; }
  .orbit::after { inset: 150px; }
  .hero-card { width: 360px; padding: 32px; }
  .hero-visual { min-height: 520px; }
  .hero-side-decor { display: flex; }
  .hero-corner-decor { display: block; }
  .hero-bg-text { font-size: 70rem; }
  .nav-links a { font-size: 1rem; }
}