/* ============================================================
   仟叶智服 官网 · 深色科技光影设计系统
   配色：近黑蓝灰底 + 单一强调色（青蓝渐变）
   ============================================================ */

:root {
  --bg: #060a14;
  --bg-soft: #0a1120;
  --surface: rgba(17, 27, 48, 0.55);
  --surface-solid: #0e1729;
  --line: rgba(148, 184, 255, 0.10);
  --line-strong: rgba(148, 184, 255, 0.20);
  --text: #eaf1ff;
  --text-2: #9fb0cc;
  --text-3: #64748f;
  --accent: #22d3ee;
  --accent-2: #3b82f6;
  --accent-3: #818cf8;
  --grad: linear-gradient(120deg, #22d3ee 0%, #3b82f6 55%, #818cf8 100%);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

::selection { background: rgba(34, 211, 238, 0.28); color: #fff; }

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ============ 背景光影 ============ */
.bg-fx { position: fixed; inset: 0; z-index: -2; overflow: hidden; background:
  radial-gradient(1200px 700px at 80% -10%, rgba(59,130,246,0.10), transparent 60%),
  var(--bg);
}
.bg-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(148,184,255,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148,184,255,0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
}
.bg-orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.5; }
.orb-1 { width: 520px; height: 520px; top: -180px; left: -120px;
  background: radial-gradient(circle, rgba(34,211,238,0.22), transparent 65%);
  animation: drift 22s ease-in-out infinite alternate; }
.orb-2 { width: 600px; height: 600px; top: -200px; right: -160px;
  background: radial-gradient(circle, rgba(59,130,246,0.25), transparent 65%);
  animation: drift 26s ease-in-out infinite alternate-reverse; }
.orb-3 { width: 480px; height: 480px; top: 40%; left: 50%; transform: translateX(-50%);
  background: radial-gradient(circle, rgba(129,140,248,0.12), transparent 65%);
  animation: drift 30s ease-in-out infinite alternate; }
@keyframes drift {
  from { transform: translate3d(0,0,0) scale(1); }
  to { transform: translate3d(40px, 50px, 0) scale(1.12); }
}
.bg-noise {
  position: absolute; inset: 0; opacity: 0.5; pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.025 0'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E");
}

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

.section { padding: 110px 0; position: relative; }
.section-alt {
  background: linear-gradient(180deg, rgba(13,22,42,0.55), rgba(8,14,28,0.55));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head { max-width: 680px; margin: 0 auto 64px; text-align: center; }
.section-head h2 {
  font-size: clamp(28px, 4vw, 42px); font-weight: 700; letter-spacing: -0.02em;
  line-height: 1.2; margin-bottom: 16px;
}
.section-head p { color: var(--text-2); font-size: 16px; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 13px; font-weight: 500; color: var(--accent);
  padding: 7px 15px; border-radius: 999px;
  background: rgba(34,211,238,0.07);
  border: 1px solid rgba(34,211,238,0.22);
  margin-bottom: 26px;
}
.eyebrow-dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: 0.35; } }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 22px; border-radius: 999px; font-size: 15px; font-weight: 600;
  border: 1px solid transparent; transition: all 0.28s cubic-bezier(.16,1,.3,1);
  white-space: nowrap; user-select: none;
}
.btn svg { width: 17px; height: 17px; }
.btn-primary {
  background: var(--grad); color: #041019;
  box-shadow: 0 6px 24px -6px rgba(34,211,238,0.55), inset 0 1px 0 rgba(255,255,255,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 34px -6px rgba(34,211,238,0.65), inset 0 1px 0 rgba(255,255,255,0.35); }
.btn-primary:active { transform: translateY(0) scale(0.985); }
.btn-outline {
  color: var(--text); border-color: var(--line-strong);
  background: rgba(255,255,255,0.02);
}
.btn-outline:hover { border-color: rgba(34,211,238,0.5); background: rgba(34,211,238,0.07); transform: translateY(-2px); }
.btn-ghost { color: var(--text-2); padding: 10px 16px; }
.btn-ghost:hover { color: var(--text); }
.btn-lg { padding: 15px 30px; font-size: 16px; }

/* ============ 导航 ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: all 0.35s ease;
}
.nav.scrolled {
  background: rgba(7, 12, 24, 0.78);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  height: 72px; display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.brand-mark { width: 32px; height: 32px; display: grid; place-items: center; }
.brand-mark svg { width: 30px; height: 30px; }
.brand-text { font-size: 18px; letter-spacing: 0.01em; }
.nav-links { display: flex; gap: 34px; }
.nav-links a { font-size: 15px; color: var(--text-2); transition: color 0.2s; position: relative; }
.nav-links a:hover { color: var(--text); }
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 2px;
  background: var(--grad); border-radius: 2px; transition: width 0.28s;
}
.nav-links a:hover::after { width: 100%; }
.nav-cta { display: flex; align-items: center; gap: 8px; }
.nav-burger { display: none; flex-direction: column; gap: 5px; background: none; border: 0; padding: 8px; }
.nav-burger span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.3s; }
.nav-mobile {
  display: none; flex-direction: column; gap: 4px; padding: 12px 24px 22px;
  background: rgba(7,12,24,0.96); backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.nav-mobile.open { display: flex; }
.nav-mobile a { padding: 12px 6px; color: var(--text-2); font-size: 16px; border-bottom: 1px solid var(--line); }

/* ============ HERO ============ */
.hero { padding: 168px 0 90px; position: relative; }
.hero-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 64px; align-items: center;
}
.hero-title {
  font-size: clamp(36px, 5.4vw, 60px); font-weight: 800; letter-spacing: -0.03em;
  line-height: 1.12; margin-bottom: 24px;
}
.hero-sub { font-size: 17.5px; color: var(--text-2); max-width: 32em; margin-bottom: 38px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 52px; }

.hero-meta { display: flex; align-items: center; gap: 28px; }
.hero-meta-item { display: flex; flex-direction: column; }
.hero-meta-item strong {
  font-size: 26px; font-weight: 800; letter-spacing: -0.02em;
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-meta-item span { font-size: 13px; color: var(--text-3); margin-top: 2px; }
.hero-meta-divider { width: 1px; height: 38px; background: var(--line-strong); }

/* ---- 对话卡片 ---- */
.hero-visual { position: relative; }
.chat-card {
  position: relative; border-radius: 20px; overflow: hidden;
  background: linear-gradient(165deg, rgba(20,32,58,0.85), rgba(10,17,33,0.92));
  border: 1px solid var(--line-strong);
  box-shadow: 0 40px 90px -30px rgba(0,0,0,0.8), 0 0 0 1px rgba(255,255,255,0.02) inset;
  backdrop-filter: blur(12px);
  animation: float 7s ease-in-out infinite;
}
@keyframes float { 50% { transform: translateY(-10px); } }
.chat-glow {
  position: absolute; top: -60px; right: -40px; width: 240px; height: 240px;
  background: radial-gradient(circle, rgba(34,211,238,0.25), transparent 70%);
  filter: blur(40px); pointer-events: none;
}
.chat-head {
  display: flex; align-items: center; gap: 12px; padding: 18px 20px;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.02);
}
.chat-avatar { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: rgba(34,211,238,0.1); }
.chat-avatar svg { width: 24px; height: 24px; }
.chat-head-info { flex: 1; display: flex; flex-direction: column; }
.chat-head-info strong { font-size: 15px; }
.chat-status { font-size: 12px; color: var(--text-3); display: flex; align-items: center; gap: 6px; }
.chat-status i { width: 6px; height: 6px; border-radius: 50%; background: #34d399; box-shadow: 0 0 8px #34d399; }
.chat-head-badge {
  font-size: 11px; font-weight: 700; letter-spacing: 0.08em;
  padding: 4px 10px; border-radius: 999px;
  background: var(--grad); color: #041019;
}
.chat-body { padding: 22px 20px; height: 300px; overflow-y: hidden; display: flex; flex-direction: column; gap: 12px; }
.msg { max-width: 82%; padding: 11px 15px; font-size: 14px; line-height: 1.55; border-radius: 14px; opacity: 0; transform: translateY(12px); }
.msg.in {
  align-self: flex-start; background: rgba(148,184,255,0.08);
  border: 1px solid var(--line); border-top-left-radius: 4px;
}
.msg.out {
  align-self: flex-end; background: var(--grad); color: #041019;
  font-weight: 500; border-top-right-radius: 4px;
}
.msg.show { animation: msgIn 0.45s cubic-bezier(.16,1,.3,1) forwards; }
@keyframes msgIn { to { opacity: 1; transform: translateY(0); } }
.typing { display: inline-flex; gap: 4px; padding: 4px 2px; }
.typing b { width: 7px; height: 7px; border-radius: 50%; background: var(--text-3); animation: typing 1.2s infinite; }
.typing b:nth-child(2) { animation-delay: 0.18s; }
.typing b:nth-child(3) { animation-delay: 0.36s; }
@keyframes typing { 0%,60%,100% { transform: translateY(0); opacity: 0.4; } 30% { transform: translateY(-5px); opacity: 1; } }

.chat-quick { display: flex; gap: 8px; padding: 0 20px 14px; flex-wrap: wrap; }
.chat-quick button {
  font-size: 12.5px; padding: 7px 14px; border-radius: 999px;
  color: var(--accent); background: rgba(34,211,238,0.07);
  border: 1px solid rgba(34,211,238,0.22); transition: all 0.2s;
}
.chat-quick button:hover { background: rgba(34,211,238,0.16); transform: translateY(-1px); }
.chat-input { display: flex; gap: 10px; padding: 14px 16px; border-top: 1px solid var(--line); background: rgba(255,255,255,0.02); }
.chat-input input {
  flex: 1; background: rgba(0,0,0,0.3); border: 1px solid var(--line);
  border-radius: 999px; padding: 11px 18px; color: var(--text); font-size: 14px; outline: none;
  transition: border-color 0.2s; font-family: inherit;
}
.chat-input input::placeholder { color: var(--text-3); }
.chat-input input:focus { border-color: rgba(34,211,238,0.55); }
.chat-input button {
  width: 42px; height: 42px; border-radius: 50%; border: 0; flex-shrink: 0;
  background: var(--grad); color: #041019; display: grid; place-items: center;
  transition: transform 0.2s;
}
.chat-input button:hover { transform: scale(1.08); }
.chat-input button svg { width: 18px; height: 18px; }

/* ============ 跑马灯 ============ */
.marquee-section { padding: 36px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.015); overflow: hidden; }
.marquee { display: flex; mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); }
.marquee-track { display: flex; align-items: center; gap: 56px; white-space: nowrap; animation: scrollx 30s linear infinite; }
.marquee-track span { font-size: 18px; font-weight: 600; color: var(--text-3); letter-spacing: 0.04em; }
.marquee-track i { width: 5px; height: 5px; border-radius: 50%; background: var(--accent-2); opacity: 0.5; }
@keyframes scrollx { to { transform: translateX(-50%); } }

/* ============ BENTO ============ */
.bento { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.bento-cell {
  position: relative; padding: 32px 28px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line);
  backdrop-filter: blur(10px); overflow: hidden;
  transition: transform 0.4s cubic-bezier(.16,1,.3,1), border-color 0.4s, box-shadow 0.4s;
}
.bento-cell:hover {
  transform: translateY(-6px); border-color: rgba(34,211,238,0.35);
  box-shadow: 0 24px 60px -24px rgba(34,211,238,0.25);
}
.cell-wide { grid-column: span 2; }
.cell-icon {
  width: 48px; height: 48px; border-radius: 13px; display: grid; place-items: center;
  background: linear-gradient(140deg, rgba(34,211,238,0.15), rgba(59,130,246,0.08));
  border: 1px solid rgba(34,211,238,0.22); margin-bottom: 20px; color: var(--accent);
}
.cell-icon svg { width: 24px; height: 24px; }
.bento-cell h3 { font-size: 19px; margin-bottom: 10px; letter-spacing: -0.01em; }
.bento-cell p { color: var(--text-2); font-size: 14.5px; }
.cell-tags { display: flex; gap: 8px; margin-top: 18px; flex-wrap: wrap; }
.cell-tags span {
  font-size: 12px; padding: 4px 12px; border-radius: 999px;
  background: rgba(148,184,255,0.06); border: 1px solid var(--line); color: var(--text-2);
}

/* bento 视觉：流程 */
.cell-art-flow {
  display: flex; align-items: center; gap: 0; margin-top: 26px; flex-wrap: wrap;
}
.flow-node {
  font-size: 12.5px; padding: 8px 14px; border-radius: 9px; white-space: nowrap;
  background: rgba(34,211,238,0.06); border: 1px solid rgba(34,211,238,0.2); color: var(--text);
}
.flow-node.n4 { background: var(--grad); color: #041019; font-weight: 600; border: 0; }
.flow-line { flex: 1; min-width: 24px; height: 1px; background: linear-gradient(90deg, rgba(34,211,238,0.5), rgba(129,140,248,0.2)); position: relative; }
.flow-line::after { content: ""; position: absolute; right: 0; top: -3px; border: 3.5px solid transparent; border-left-color: rgba(129,140,248,0.6); }

/* bento 视觉：柱状图 */
.cell-art-bars { display: flex; align-items: flex-end; gap: 14px; height: 110px; margin-top: 28px; }
.bar {
  flex: 1; height: var(--h); min-height: 8px; border-radius: 6px 6px 3px 3px;
  background: linear-gradient(180deg, rgba(59,130,246,0.7), rgba(59,130,246,0.12));
  display: flex; align-items: flex-end; justify-content: center; position: relative;
  transition: all 0.3s;
}
.bar-hot { background: linear-gradient(180deg, #22d3ee, rgba(34,211,238,0.15)); box-shadow: 0 0 24px -4px rgba(34,211,238,0.6); }
.bar span { position: absolute; bottom: -24px; font-size: 11px; color: var(--text-3); white-space: nowrap; }

/* ============ 步骤 ============ */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
.step { position: relative; padding: 0 24px; }
.step-num {
  font-size: 44px; font-weight: 800; letter-spacing: -0.03em; line-height: 1;
  background: linear-gradient(180deg, rgba(34,211,238,0.9), rgba(34,211,238,0.12));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 22px;
}
.step-body h3 { font-size: 18px; margin-bottom: 9px; }
.step-body p { color: var(--text-2); font-size: 14px; }
.step-line { position: absolute; top: 22px; right: -20px; width: 40px; height: 2px;
  background: linear-gradient(90deg, rgba(34,211,238,0.5), transparent); }
.step:last-child .step-line { display: none; }

/* ============ 多端 ============ */
.platform-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 72px; align-items: center; }
.platform-copy h2 { font-size: clamp(28px, 3.6vw, 40px); letter-spacing: -0.02em; line-height: 1.22; margin-bottom: 18px; }
.platform-copy > p { color: var(--text-2); font-size: 16px; margin-bottom: 36px; }
.platform-list { display: flex; flex-direction: column; gap: 26px; }
.platform-list li { display: flex; gap: 18px; align-items: flex-start; }
.li-icon {
  flex-shrink: 0; width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(34,211,238,0.08); border: 1px solid rgba(34,211,238,0.2); color: var(--accent);
}
.li-icon svg { width: 21px; height: 21px; }
.platform-list strong { font-size: 16px; display: block; margin-bottom: 3px; }
.platform-list p { font-size: 14px; color: var(--text-2); }

/* 浏览器 mock */
.browser {
  border-radius: 14px; overflow: hidden; border: 1px solid var(--line-strong);
  background: var(--surface-solid);
  box-shadow: 0 50px 100px -30px rgba(0,0,0,0.85), 0 0 60px -20px rgba(59,130,246,0.3);
}
.browser-bar { display: flex; align-items: center; gap: 8px; padding: 13px 16px; background: rgba(255,255,255,0.03); border-bottom: 1px solid var(--line); }
.browser-bar .dot { width: 11px; height: 11px; border-radius: 50%; }
.dot.r { background: #ff5f57; } .dot.y { background: #febc2e; } .dot.g { background: #28c840; }
.browser-url {
  flex: 1; margin-left: 12px; font-size: 12px; color: var(--text-3);
  background: rgba(0,0,0,0.3); border-radius: 7px; padding: 5px 14px; text-align: center;
}
.browser-body { position: relative; height: 380px; padding: 18px; background:
  linear-gradient(180deg, #0b1426, #080e1c); }
.mock-banner { height: 90px; border-radius: 10px; margin-bottom: 16px;
  background: linear-gradient(120deg, rgba(59,130,246,0.25), rgba(129,140,248,0.12));
  border: 1px solid var(--line); position: relative; overflow: hidden; }
.mock-banner::after { content: ""; position: absolute; inset: 0;
  background: linear-gradient(110deg, transparent 30%, rgba(255,255,255,0.06) 50%, transparent 70%);
  animation: sheen 4s ease-in-out infinite; }
@keyframes sheen { 0%,100% { transform: translateX(-30%); } 50% { transform: translateX(30%); } }
.mock-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.mock-card { border: 1px solid var(--line); border-radius: 10px; padding: 12px; background: rgba(255,255,255,0.02); }
.mock-card i { display: block; height: 52px; border-radius: 7px; background: linear-gradient(135deg, rgba(34,211,238,0.18), rgba(59,130,246,0.08)); margin-bottom: 10px; }
.mock-card b { display: block; height: 8px; width: 75%; border-radius: 4px; background: rgba(148,184,255,0.18); margin-bottom: 7px; }
.mock-card em { display: block; height: 7px; width: 45%; border-radius: 4px; background: rgba(148,184,255,0.1); }

.mock-fab {
  position: absolute; right: 24px; bottom: 24px; width: 54px; height: 54px; border-radius: 50%;
  border: 0; background: var(--grad); color: #041019; display: grid; place-items: center;
  box-shadow: 0 12px 30px -6px rgba(34,211,238,0.6); z-index: 3; transition: transform 0.3s;
}
.mock-fab:hover { transform: scale(1.08) rotate(-6deg); }
.mock-fab svg { width: 24px; height: 24px; }
.mock-panel {
  position: absolute; right: 24px; bottom: 92px; width: 272px; border-radius: 14px;
  background: rgba(12,20,38,0.96); border: 1px solid var(--line-strong);
  box-shadow: 0 24px 60px -16px rgba(0,0,0,0.8); overflow: hidden; z-index: 2;
  transform-origin: bottom right; transform: scale(0.85) translateY(12px); opacity: 0; pointer-events: none;
  transition: all 0.35s cubic-bezier(.16,1,.3,1);
}
.mock-panel.open { transform: scale(1) translateY(0); opacity: 1; }
.mock-panel-h { padding: 13px 16px; font-size: 13.5px; font-weight: 600; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; }
.mock-panel-h span { font-size: 11px; font-weight: 400; color: #34d399; }
.mock-panel-b { padding: 14px; display: flex; flex-direction: column; gap: 9px; }
.mock-msg { font-size: 12.5px; line-height: 1.5; padding: 9px 12px; border-radius: 10px; background: rgba(148,184,255,0.08); border-top-left-radius: 3px; }

/* ============ 数据 ============ */
.stats-section { padding: 100px 0; text-align: center; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat { position: relative; padding: 40px 16px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line); }
.stat-num {
  font-size: clamp(38px, 4.4vw, 56px); font-weight: 800; letter-spacing: -0.03em; line-height: 1;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-label { margin-top: 14px; font-size: 14px; color: var(--text-2); }
.stats-note { margin-top: 34px; font-size: 13px; color: var(--text-3); }

/* ============ 套餐 ============ */
.pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.price-card {
  position: relative; padding: 38px 32px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line);
  display: flex; flex-direction: column; transition: transform 0.35s, border-color 0.35s, box-shadow 0.35s;
}
.price-card:hover { transform: translateY(-6px); border-color: var(--line-strong); }
.price-featured {
  border-color: rgba(34,211,238,0.45);
  background: linear-gradient(170deg, rgba(34,211,238,0.08), rgba(59,130,246,0.04) 40%, var(--surface));
  box-shadow: 0 30px 70px -30px rgba(34,211,238,0.35);
}
.price-badge {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  font-size: 12px; font-weight: 700; padding: 6px 18px; border-radius: 999px;
  background: var(--grad); color: #041019; white-space: nowrap;
}
.price-card h3 { font-size: 20px; margin-bottom: 8px; }
.price-desc { font-size: 13.5px; color: var(--text-3); min-height: 42px; margin-bottom: 22px; }
.price { display: flex; align-items: baseline; gap: 4px; margin-bottom: 28px; }
.price-currency { font-size: 20px; font-weight: 700; color: var(--text-2); }
.price-amount { font-size: 38px; font-weight: 800; letter-spacing: -0.02em; }
.price-card ul { display: flex; flex-direction: column; gap: 14px; margin-bottom: 32px; flex: 1; }
.price-card li { display: flex; align-items: center; gap: 11px; font-size: 14.5px; color: var(--text-2); }
.price-card li svg { width: 17px; height: 17px; color: var(--accent); flex-shrink: 0; }
.price-card li.muted { color: var(--text-3); }
.price-card li.muted svg { color: var(--text-3); }
.price-card .btn { width: 100%; }

/* ============ CTA ============ */
.cta-section { padding: 110px 0; }
.cta-box {
  position: relative; text-align: center; padding: 80px 32px; border-radius: 24px; overflow: hidden;
  background: linear-gradient(160deg, rgba(20,32,58,0.9), rgba(9,15,30,0.95));
  border: 1px solid var(--line-strong);
}
.cta-glow {
  position: absolute; width: 500px; height: 500px; top: -280px; left: 50%; transform: translateX(-50%);
  background: radial-gradient(circle, rgba(34,211,238,0.22), transparent 65%); filter: blur(50px); pointer-events: none;
}
.cta-box h2 { font-size: clamp(28px, 4vw, 42px); letter-spacing: -0.02em; margin-bottom: 16px; position: relative; }
.cta-box p { color: var(--text-2); font-size: 16px; margin-bottom: 38px; position: relative; }
.cta-actions { justify-content: center; margin-bottom: 0; position: relative; }

/* ============ 页脚 ============ */
.footer { border-top: 1px solid var(--line); background: rgba(5,9,18,0.7); padding: 72px 0 0; }
.footer-inner { display: grid; grid-template-columns: 1.2fr 2fr; gap: 56px; padding-bottom: 52px; }
.footer-brand p { color: var(--text-3); font-size: 14px; margin-top: 18px; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.footer-col h4 { font-size: 14px; margin-bottom: 18px; color: var(--text); }
.footer-col a, .footer-col span { display: block; font-size: 14px; color: var(--text-3); margin-bottom: 12px; transition: color 0.2s; }
.footer-col a:hover { color: var(--accent); }
.footer-mute { font-size: 12.5px !important; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px;
  padding: 26px 24px; border-top: 1px solid var(--line);
  font-size: 13px; color: var(--text-3);
}

/* ============ 滚动揭示 ============ */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s cubic-bezier(.16,1,.3,1), transform 0.7s cubic-bezier(.16,1,.3,1); }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 56px; }
  .hero-copy { text-align: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-actions, .hero-meta { justify-content: center; }
  .bento { grid-template-columns: repeat(2, 1fr); }
  .cell-wide { grid-column: span 2; }
  .steps { grid-template-columns: repeat(2, 1fr); gap: 40px 24px; }
  .step-line { display: none; }
  .platform-grid { grid-template-columns: 1fr; gap: 48px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
  .footer-inner { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .nav-burger { display: flex; }
  .section { padding: 78px 0; }
  .hero { padding: 132px 0 60px; }
  .hero-meta { gap: 18px; }
  .hero-meta-divider { display: none; }
  .bento { grid-template-columns: 1fr; }
  .cell-wide { grid-column: span 1; }
  .cell-art-flow { display: none; }
  .steps { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .stat { padding: 28px 10px; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
  .footer-bottom { justify-content: flex-start; }
  .chat-body { height: 260px; }
}

/* ============================================================
   手机端精修（≤768px）
   ============================================================ */
@media (max-width: 768px) {
  body { font-size: 15px; }
  .container { padding: 0 18px; }

  /* 导航更轻 */
  .nav-inner { height: 60px; padding: 0 18px; }
  .brand-text { font-size: 17px; }
  .nav-mobile { padding: 8px 18px 18px; }
  .nav-mobile a { padding: 13px 4px; font-size: 15px; }

  /* 区块节奏 */
  .section { padding: 64px 0; }
  .section-head { margin-bottom: 40px; }
  .section-head h2 { font-size: 26px; line-height: 1.28; }
  .section-head p { font-size: 15px; }

  /* Hero */
  .hero { padding: 112px 0 56px; }
  .hero-inner { gap: 40px; padding: 0 18px; }
  .eyebrow { font-size: 12px; padding: 6px 13px; margin-bottom: 20px; }
  .hero-title { font-size: clamp(30px, 8.4vw, 38px); line-height: 1.18; margin-bottom: 18px; }
  .hero-sub { font-size: 15.5px; margin-bottom: 30px; }
  .hero-actions { gap: 12px; margin-bottom: 36px; }
  .btn-lg { padding: 14px 24px; font-size: 15.5px; width: 100%; }
  .hero-actions { display: grid; grid-template-columns: 1fr; width: 100%; }

  /* Hero 指标：纵向排列 */
  .hero-meta { flex-direction: column; gap: 18px; align-items: flex-start; text-align: left; }
  .hero-meta-item strong { font-size: 22px; }

  /* 对话卡片 */
  .chat-card { border-radius: 16px; }
  .chat-head { padding: 14px 16px; }
  .chat-body { height: 248px; padding: 18px 16px; gap: 10px; }
  .msg { font-size: 13.5px; padding: 10px 13px; max-width: 86%; }
  .chat-quick { padding: 0 16px 12px; gap: 7px; }
  .chat-quick button { font-size: 12px; padding: 6px 12px; }
  .chat-input { padding: 12px; gap: 8px; }
  .chat-input input { padding: 10px 15px; font-size: 13.5px; }
  .chat-input button { width: 40px; height: 40px; }

  /* 跑马灯 */
  .marquee-section { padding: 26px 0; }
  .marquee-track { gap: 36px; }
  .marquee-track span { font-size: 15px; }

  /* Bento */
  .bento { gap: 14px; }
  .bento-cell { padding: 24px 20px; border-radius: 14px; }
  .cell-icon { width: 42px; height: 42px; margin-bottom: 16px; }
  .cell-icon svg { width: 21px; height: 21px; }
  .bento-cell h3 { font-size: 17px; }
  .bento-cell p { font-size: 14px; }
  .cell-art-bars { height: 90px; gap: 9px; margin-top: 24px; }
  .bar span { font-size: 10px; bottom: -21px; }

  /* 步骤 */
  .steps { gap: 30px; }
  .step { padding: 0; }
  .step-num { font-size: 34px; margin-bottom: 12px; }
  .step-body h3 { font-size: 16.5px; }

  /* 多端接入 */
  .platform-grid { gap: 36px; }
  .platform-copy h2 { font-size: 26px; }
  .platform-list { gap: 20px; }
  .browser-body { height: 320px; padding: 14px; }
  .mock-banner { height: 68px; margin-bottom: 12px; }
  .mock-row { gap: 9px; }
  .mock-card { padding: 9px; }
  .mock-card i { height: 40px; margin-bottom: 8px; }
  .mock-fab { width: 48px; height: 48px; right: 16px; bottom: 16px; }
  .mock-panel { width: calc(100% - 32px); right: 16px; bottom: 78px; }

  /* 数据 */
  .stats-section { padding: 64px 0; }
  .stats-grid { gap: 12px; }
  .stat { padding: 24px 10px; border-radius: 14px; }
  .stat-num { font-size: 30px; }
  .stat-label { font-size: 12.5px; margin-top: 10px; line-height: 1.45; }
  .stats-note { font-size: 12px; margin-top: 24px; padding: 0 8px; }

  /* 套餐 */
  .pricing { gap: 16px; }
  .price-card { padding: 30px 24px; border-radius: 14px; }
  .price-desc { min-height: 0; }
  .price-card .btn { width: 100%; }

  /* CTA */
  .cta-section { padding: 64px 0; }
  .cta-box { padding: 52px 22px; border-radius: 18px; }
  .cta-box h2 { font-size: 26px; }
  .cta-box p { font-size: 15px; }
  .cta-actions { display: grid; grid-template-columns: 1fr; width: 100%; }

  /* 页脚 */
  .footer { padding-top: 52px; }
  .footer-inner { gap: 32px; padding-bottom: 36px; }
  .footer-cols { gap: 26px 20px; }
  .footer-bottom { padding: 22px 18px; font-size: 12px; gap: 6px; }
}

/* 小屏手机（≤380px）再收一档 */
@media (max-width: 380px) {
  .hero-title { font-size: 28px; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat-num { font-size: 26px; }
  .footer-cols { grid-template-columns: 1fr; }
  .mock-row { grid-template-columns: 1fr; }
  .mock-card { display: flex; align-items: center; gap: 10px; }
  .mock-card i { width: 52px; height: 34px; margin-bottom: 0; flex-shrink: 0; }
}

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