/* =============================================================
   AiTool 官网设计系统 styles.css
   纯 CSS，零依赖。亮/暗双主题，企业级视觉，响应式与动效。
   ============================================================= */

/* ---------- 设计令牌：亮色主题（默认） ---------- */
:root {
  /* 品牌主色：科技蓝紫渐变 */
  --brand-1: #4f46e5;          /* 靛蓝 */
  --brand-2: #7c3aed;          /* 紫 */
  --brand-3: #06b6d4;          /* 青 */
  --brand-grad: linear-gradient(120deg, #4f46e5 0%, #7c3aed 50%, #06b6d4 100%);
  --brand-grad-soft: linear-gradient(120deg, rgba(79,70,229,.14), rgba(124,58,237,.10), rgba(6,182,212,.12));

  /* 中性色 */
  --bg: #ffffff;
  --bg-soft: #f6f7fb;
  --bg-elev: #ffffff;
  --surface: #ffffff;
  --surface-2: #f3f4f8;
  --border: rgba(17, 24, 39, 0.10);
  --border-strong: rgba(17, 24, 39, 0.16);

  --text: #0f172a;
  --text-soft: #475569;
  --text-mut: #64748b;
  --text-invert: #ffffff;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06), 0 1px 3px rgba(15, 23, 42, .08);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, .10);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, .14);
  --shadow-brand: 0 18px 40px rgba(79, 70, 229, .28);

  --glass: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.6);

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --ring: rgba(79, 70, 229, .35);

  --maxw: 1200px;
  --nav-h: 72px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
          "Helvetica Neue", Arial, system-ui, sans-serif;
}

/* ---------- 设计令牌：暗色主题 ---------- */
[data-theme="dark"] {
  --bg: #0a0b14;
  --bg-soft: #0f1120;
  --bg-elev: #12152a;
  --surface: #141832;
  --surface-2: #1b2042;
  --border: rgba(148, 163, 184, 0.14);
  --border-strong: rgba(148, 163, 184, 0.26);

  --text: #f1f5f9;
  --text-soft: #cbd5e1;
  --text-mut: #94a3b8;
  --text-invert: #0a0b14;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, .45);
  --shadow-lg: 0 30px 70px rgba(0, 0, 0, .55);
  --shadow-brand: 0 18px 46px rgba(124, 58, 237, .45);

  --glass: rgba(18, 21, 42, 0.62);
  --glass-border: rgba(148, 163, 184, 0.18);

  --brand-grad-soft: linear-gradient(120deg, rgba(79,70,229,.22), rgba(124,58,237,.16), rgba(6,182,212,.18));
  --ring: rgba(124, 58, 237, .5);
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color .4s ease, color .4s ease;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
h1, h2, h3, h4 { line-height: 1.2; margin: 0; letter-spacing: -0.02em; }

/* 语言切换闪烁优化 */
[data-i18n] { transition: opacity .15s ease; }

/* ---------- 布局工具 ---------- */
.container { width: min(100% - 40px, var(--maxw)); margin-inline: auto; }
.section { padding: clamp(64px, 9vw, 132px) 0; position: relative; }
.section--soft { background: var(--bg-soft); }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; color: var(--brand-1);
  padding: 6px 14px; border-radius: 999px;
  background: var(--brand-grad-soft); border: 1px solid var(--border);
}
[data-theme="dark"] .eyebrow { color: #c4b5fd; }

.section-head { max-width: 760px; margin: 0 auto clamp(40px, 5vw, 64px); text-align: center; }
.section-head h2 {
  font-size: clamp(28px, 4vw, 46px); font-weight: 800; margin: 18px 0 14px;
}
.section-head p { color: var(--text-soft); font-size: clamp(15px, 1.6vw, 18px); margin: 0; }

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

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 13px 24px; border-radius: 999px; font-weight: 700; font-size: 15px;
  transition: transform .2s ease, box-shadow .25s ease, background .25s ease, border-color .2s ease;
  white-space: nowrap;
}
.btn:focus-visible { outline: 3px solid var(--ring); outline-offset: 2px; }
.btn--primary { background: var(--brand-grad); color: #fff; box-shadow: var(--shadow-brand); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 22px 48px rgba(79,70,229,.4); }
.btn--ghost { background: var(--surface); color: var(--text); border: 1px solid var(--border-strong); }
.btn--ghost:hover { transform: translateY(-2px); border-color: var(--brand-1); }
.btn--lg { padding: 16px 32px; font-size: 16px; }
.btn--block { width: 100%; }
.btn svg { width: 18px; height: 18px; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; height: var(--nav-h); z-index: 100;
  display: flex; align-items: center;
  transition: background .35s ease, box-shadow .35s ease, border-color .35s ease;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: var(--glass);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.nav__inner { width: min(100% - 40px, 1320px); margin-inline: auto; display: flex; align-items: center; gap: 22px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; font-size: 19px; }
.brand__logo { width: 38px; height: 38px; flex: none; }
.brand__name { letter-spacing: -.02em; }
.brand__name b { color: var(--brand-1); }
[data-theme="dark"] .brand__name b { color: #a78bfa; }

.nav__links { display: flex; align-items: center; gap: 4px; margin-left: 8px; }
.nav__links a {
  padding: 9px 14px; border-radius: 10px; font-size: 15px; font-weight: 600;
  color: var(--text-soft); transition: color .2s, background .2s;
}
.nav__links a:hover { color: var(--text); background: var(--surface-2); }
.nav__actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }

/* 图标按钮（主题/语言/菜单） */
.icon-btn {
  width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center;
  color: var(--text-soft); border: 1px solid var(--border);
  background: var(--surface); transition: all .2s ease;
}
.icon-btn:hover { color: var(--text); border-color: var(--brand-1); transform: translateY(-1px); }
.icon-btn svg { width: 20px; height: 20px; }

/* 语言切换下拉 */
.lang { position: relative; }
.lang__btn { gap: 7px; width: auto; padding: 0 13px; font-weight: 600; font-size: 14px; }
.lang__btn .chev { width: 14px; height: 14px; transition: transform .2s; }
.lang.open .lang__btn .chev { transform: rotate(180deg); }
.lang__menu {
  position: absolute; right: 0; top: calc(100% + 10px); min-width: 172px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  box-shadow: var(--shadow-lg); padding: 6px; opacity: 0; visibility: hidden;
  transform: translateY(-8px); transition: all .2s ease; z-index: 50;
}
.lang.open .lang__menu { opacity: 1; visibility: visible; transform: translateY(0); }
.lang__menu button {
  width: 100%; display: flex; align-items: center; gap: 10px; padding: 10px 12px;
  border-radius: 9px; color: var(--text-soft); font-size: 14px; font-weight: 600; text-align: left;
}
.lang__menu button:hover { background: var(--surface-2); color: var(--text); }
.lang__menu button.active { color: var(--brand-1); background: var(--brand-grad-soft); }
.lang__menu .flag { font-size: 17px; }

.theme-toggle .sun { display: none; }
.theme-toggle .moon { display: block; }
[data-theme="dark"] .theme-toggle .sun { display: block; }
[data-theme="dark"] .theme-toggle .moon { display: none; }

.nav__cta { display: inline-flex; }
.nav__burger { display: none; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: calc(var(--nav-h) + 70px) 0 90px; overflow: hidden; }
.hero__bg { position: absolute; inset: 0; z-index: -1; overflow: hidden; }
.hero__blob {
  position: absolute; border-radius: 50%; filter: blur(70px); opacity: .55;
  animation: float 16s ease-in-out infinite;
}
.hero__blob.b1 { width: 460px; height: 460px; background: #6366f1; top: -120px; right: -60px; }
.hero__blob.b2 { width: 380px; height: 380px; background: #06b6d4; top: 180px; left: -120px; animation-delay: -4s; }
.hero__blob.b3 { width: 320px; height: 320px; background: #a855f7; bottom: -120px; right: 30%; animation-delay: -8s; }
[data-theme="dark"] .hero__blob { opacity: .4; }
.hero__grid-overlay {
  position: absolute; inset: 0;
  background-image: linear-gradient(var(--border) 1px, transparent 1px),
                    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px; mask-image: radial-gradient(ellipse at 50% 0%, #000 35%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 35%, transparent 78%); opacity: .5;
}

.hero__inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.hero__badge {
  display: inline-flex; align-items: center; gap: 9px; padding: 7px 14px 7px 8px;
  border-radius: 999px; background: var(--surface); border: 1px solid var(--border);
  font-size: 13px; font-weight: 600; color: var(--text-soft); box-shadow: var(--shadow-sm);
}
.hero__badge .dot { width: 22px; height: 22px; border-radius: 999px; background: var(--brand-grad); color: #fff; display: grid; place-items: center; font-size: 12px; }
.hero h1 { font-size: clamp(36px, 5.6vw, 68px); font-weight: 850; margin: 22px 0 0; }
.hero__sub { font-size: clamp(16px, 2vw, 20px); color: var(--text-soft); margin: 22px 0 0; max-width: 560px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.hero__note { display: flex; align-items: center; gap: 8px; margin-top: 18px; font-size: 13px; color: var(--text-mut); }
.hero__note svg { width: 16px; height: 16px; color: #22c55e; }

/* Hero 数据条 */
.hero__stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 46px; }
.stat { }
.stat__num { font-size: clamp(24px, 3vw, 34px); font-weight: 850; }
.stat__label { font-size: 13px; color: var(--text-mut); margin-top: 2px; }

/* Hero 可视化卡片（产品工作台示意） */
.hero__visual { position: relative; }
.mock {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); overflow: hidden; transform: perspective(1600px) rotateY(-8deg) rotateX(3deg);
  transition: transform .5s ease;
}
.hero__visual:hover .mock { transform: perspective(1600px) rotateY(-3deg) rotateX(1deg); }
.mock__bar { display: flex; align-items: center; gap: 7px; padding: 13px 16px; border-bottom: 1px solid var(--border); background: var(--surface-2); }
.mock__bar i { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.mock__bar i:nth-child(1) { background: #ff5f57; }
.mock__bar i:nth-child(2) { background: #febc2e; }
.mock__bar i:nth-child(3) { background: #28c840; }
.mock__bar span { margin-left: 10px; font-size: 12px; color: var(--text-mut); }
.mock__body { padding: 18px; display: grid; grid-template-columns: 88px 1fr; gap: 16px; }
.mock__rail { display: grid; gap: 9px; }
.mock__rail i { height: 30px; border-radius: 9px; background: var(--surface-2); border: 1px solid var(--border); }
.mock__rail i.on { background: var(--brand-grad); border: none; }
.mock__canvas { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.mock__tile { aspect-ratio: 4/5; border-radius: 14px; position: relative; overflow: hidden; border: 1px solid var(--border); }
.mock__tile svg { width: 100%; height: 100%; }
.mock__cap { position: absolute; left: 8px; bottom: 8px; font-size: 11px; font-weight: 700; color: #fff; background: rgba(0,0,0,.45); padding: 3px 9px; border-radius: 999px; backdrop-filter: blur(4px); }

.float-card {
  position: absolute; background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 12px 14px; box-shadow: var(--shadow-md);
  display: flex; align-items: center; gap: 10px; font-size: 13px; font-weight: 600;
  animation: float 7s ease-in-out infinite;
}
.float-card .ic { width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center; color: #fff; flex: none; }
.float-card small { display: block; font-weight: 500; color: var(--text-mut); font-size: 11px; }
.float-card.fc1 { top: -22px; left: -26px; }
.float-card.fc2 { bottom: 30px; right: -30px; animation-delay: -3s; }

/* ---------- 客户 LOGO 墙 ---------- */
.marquee { overflow: hidden; -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.marquee__track { display: flex; gap: 60px; width: max-content; animation: marquee 32s linear infinite; align-items: center; }
.marquee:hover .marquee__track { animation-play-state: paused; }
.marquee__track .logo-item { display: flex; align-items: center; gap: 10px; color: var(--text-mut); font-weight: 800; font-size: 19px; opacity: .8; }
.marquee__track .logo-item svg { width: 26px; height: 26px; }
.trust-note { text-align: center; color: var(--text-mut); font-size: 14px; margin-bottom: 30px; }

/* ---------- 卡片网格通用 ---------- */
.grid { display: grid; gap: 22px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 28px; transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  position: relative; overflow: hidden;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--border-strong); }
.card__icon { width: 54px; height: 54px; border-radius: 15px; display: grid; place-items: center; color: #fff; margin-bottom: 18px; }
.card__icon svg { width: 27px; height: 27px; }
.card h3 { font-size: 20px; margin-bottom: 9px; }
.card p { color: var(--text-soft); font-size: 15px; margin: 0 0 14px; }
.card__tags { display: flex; flex-wrap: wrap; gap: 7px; }
.tag { font-size: 12.5px; font-weight: 600; color: var(--text-soft); background: var(--surface-2); border: 1px solid var(--border); padding: 4px 11px; border-radius: 999px; }

/* 渐变图标底色 */
.ic-grad-1 { background: linear-gradient(135deg,#4f46e5,#7c3aed); }
.ic-grad-2 { background: linear-gradient(135deg,#ec4899,#f43f5e); }
.ic-grad-3 { background: linear-gradient(135deg,#06b6d4,#3b82f6); }
.ic-grad-4 { background: linear-gradient(135deg,#f59e0b,#ef4444); }
.ic-grad-5 { background: linear-gradient(135deg,#10b981,#06b6d4); }
.ic-grad-6 { background: linear-gradient(135deg,#8b5cf6,#6366f1); }

/* ---------- 解决方案（图文交替） ---------- */
.solutions { display: grid; gap: 28px; }
.solution {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(28px, 5vw, 64px); align-items: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-xl);
  padding: clamp(28px, 4vw, 52px); box-shadow: var(--shadow-sm);
}
.solution:nth-child(even) .solution__media { order: -1; }
.solution h3 { font-size: clamp(22px, 2.6vw, 30px); margin-bottom: 14px; }
.solution p { color: var(--text-soft); margin: 0 0 20px; }
.checklist { display: grid; gap: 12px; }
.checklist li { display: flex; gap: 11px; align-items: flex-start; font-weight: 600; }
.checklist svg { width: 22px; height: 22px; color: #fff; background: var(--brand-grad); border-radius: 50%; padding: 4px; flex: none; }
.solution__media { border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--border); background: var(--surface-2); aspect-ratio: 4/3; }
.solution__media svg { width: 100%; height: 100%; }

/* ---------- 工作流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: step; }
.step { position: relative; padding-top: 14px; }
.step__num { font-size: 14px; font-weight: 800; color: #fff; width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: var(--brand-grad); margin-bottom: 16px; box-shadow: var(--shadow-brand); }
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { color: var(--text-soft); font-size: 14.5px; margin: 0; }
.step:not(:last-child)::after { content: ""; position: absolute; top: 33px; left: 56px; right: -12px; height: 2px; background: linear-gradient(90deg, var(--border-strong), transparent); }

/* ---------- 产品矩阵（多端） ---------- */
.platforms { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.platform { text-align: center; padding: 34px 22px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); transition: transform .3s, box-shadow .3s; }
.platform:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.platform__ic { width: 64px; height: 64px; margin: 0 auto 16px; border-radius: 18px; display: grid; place-items: center; color: #fff; }
.platform__ic svg { width: 32px; height: 32px; }
.platform h3 { font-size: 18px; margin-bottom: 8px; }
.platform p { color: var(--text-soft); font-size: 14px; margin: 0; }

/* ---------- 技术指标 ---------- */
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.metric { text-align: center; padding: 34px 18px; border-radius: var(--radius-lg); background: var(--brand-grad-soft); border: 1px solid var(--border); }
.metric__num { font-size: clamp(30px, 4vw, 46px); font-weight: 850; }
.metric__num .text-grad { display: inline; }
.metric__label { font-weight: 700; margin-top: 6px; }
.metric__desc { color: var(--text-soft); font-size: 13.5px; margin-top: 4px; }

/* ---------- 价格 ---------- */
.pricing { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; align-items: stretch; }
.plan { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 30px 26px; display: flex; flex-direction: column; position: relative; transition: transform .3s, box-shadow .3s; }
.plan:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.plan--featured { border: 1.5px solid transparent; background:
    linear-gradient(var(--surface), var(--surface)) padding-box,
    var(--brand-grad) border-box; box-shadow: var(--shadow-brand); }
.plan__badge { position: absolute; top: -13px; left: 50%; transform: translateX(-50%); background: var(--brand-grad); color: #fff; font-size: 12px; font-weight: 800; padding: 5px 16px; border-radius: 999px; white-space: nowrap; }
.plan__name { font-size: 18px; font-weight: 800; }
.plan__desc { color: var(--text-mut); font-size: 13.5px; margin: 6px 0 18px; min-height: 38px; }
.plan__price { display: flex; align-items: baseline; gap: 6px; margin-bottom: 4px; }
.plan__price .amount { font-size: 40px; font-weight: 850; }
.plan__price .unit { color: var(--text-mut); font-size: 14px; }
.plan__period { color: var(--text-mut); font-size: 13px; margin-bottom: 22px; }
.plan__features { display: grid; gap: 11px; margin-bottom: 26px; }
.plan__features li { display: flex; gap: 10px; align-items: flex-start; font-size: 14.5px; color: var(--text-soft); }
.plan__features svg { width: 19px; height: 19px; color: var(--brand-1); flex: none; margin-top: 2px; }
.plan .btn { margin-top: auto; }
.pricing-note { text-align: center; margin-top: 28px; color: var(--text-mut); font-size: 14px; }

/* ---------- 客户评价 ---------- */
.testimonials { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.quote { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 30px; box-shadow: var(--shadow-sm); }
.quote__stars { color: #f59e0b; letter-spacing: 2px; font-size: 16px; margin-bottom: 14px; }
.quote p { font-size: 15.5px; color: var(--text); margin: 0 0 22px; }
.quote__who { display: flex; align-items: center; gap: 12px; }
.quote__av { width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 17px; flex: none; }
.quote__who b { display: block; font-size: 15px; }
.quote__who span { color: var(--text-mut); font-size: 13px; }

/* ---------- FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 14px; }
.faq__item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: border-color .25s; }
.faq__item.open { border-color: var(--brand-1); }
.faq__q { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 24px; font-size: 16.5px; font-weight: 700; color: var(--text); text-align: left; }
.faq__q .pm { width: 26px; height: 26px; flex: none; border-radius: 8px; display: grid; place-items: center; background: var(--surface-2); transition: transform .3s, background .3s; }
.faq__item.open .faq__q .pm { transform: rotate(45deg); background: var(--brand-grad); color: #fff; }
.faq__a { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq__a p { padding: 0 24px 22px; margin: 0; color: var(--text-soft); }

/* ---------- CTA Band ---------- */
.cta-band { position: relative; border-radius: var(--radius-xl); padding: clamp(44px, 6vw, 76px); text-align: center; overflow: hidden; background: var(--brand-grad); color: #fff; box-shadow: var(--shadow-brand); }
.cta-band::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(circle at 20% 20%, rgba(255,255,255,.18), transparent 40%), radial-gradient(circle at 80% 70%, rgba(255,255,255,.14), transparent 42%); }
.cta-band h2 { position: relative; font-size: clamp(28px, 4vw, 44px); font-weight: 850; margin-bottom: 14px; }
.cta-band p { position: relative; font-size: clamp(15px, 1.8vw, 19px); opacity: .92; max-width: 620px; margin: 0 auto 30px; }
.cta-band .cta-row { position: relative; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.cta-band .btn--primary { background: #fff; color: var(--brand-1); box-shadow: 0 14px 40px rgba(0,0,0,.25); }
.cta-band .btn--ghost { background: rgba(255,255,255,.12); color: #fff; border-color: rgba(255,255,255,.5); }

/* ---------- 页脚 ---------- */
.footer { background: var(--bg-soft); border-top: 1px solid var(--border); padding: 70px 0 34px; }
.footer__top { display: grid; grid-template-columns: 1.6fr repeat(4, 1fr); gap: 36px; }
.footer__brand .brand { margin-bottom: 16px; }
.footer__brand p { color: var(--text-soft); font-size: 14px; max-width: 320px; margin: 0 0 18px; }
.footer__social { display: flex; gap: 10px; }
.footer__social a { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; background: var(--surface); border: 1px solid var(--border); color: var(--text-soft); transition: all .2s; }
.footer__social a:hover { color: #fff; background: var(--brand-grad); border-color: transparent; transform: translateY(-2px); }
.footer__social svg { width: 18px; height: 18px; }
.footer__col h4 { font-size: 14px; text-transform: uppercase; letter-spacing: .08em; color: var(--text-mut); margin-bottom: 16px; }
.footer__col a { display: block; color: var(--text-soft); font-size: 14.5px; padding: 6px 0; transition: color .2s; }
.footer__col a:hover { color: var(--brand-1); }
.footer__bottom { margin-top: 50px; padding-top: 26px; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; align-items: center; color: var(--text-mut); font-size: 13.5px; }
.footer__bottom .links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer__bottom a:hover { color: var(--brand-1); }

/* ---------- 滚动入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }
.reveal[data-delay="4"] { transition-delay: .32s; }

/* 顶部滚动进度条 */
.scroll-progress { position: fixed; top: 0; left: 0; height: 3px; width: 0; background: var(--brand-grad); z-index: 200; transition: width .1s linear; }

/* 回到顶部 */
.to-top { position: fixed; right: 22px; bottom: 22px; width: 46px; height: 46px; border-radius: 14px; background: var(--brand-grad); color: #fff; display: grid; place-items: center; box-shadow: var(--shadow-brand); opacity: 0; visibility: hidden; transform: translateY(12px); transition: all .3s; z-index: 90; }
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.to-top svg { width: 22px; height: 22px; }

/* ---------- 动画关键帧 ---------- */
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-18px); } }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { max-width: 560px; margin: 10px auto 0; }
  .float-card.fc1 { left: 0; }
  .float-card.fc2 { right: 0; }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .platforms, .metrics, .pricing { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .step::after { display: none; }
  .testimonials { grid-template-columns: 1fr 1fr; }
  .footer__top { grid-template-columns: 1fr 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .nav__links { display: none; }
  .nav__cta { display: none; }
  .nav__burger { display: grid; }
  .solution, .solution:nth-child(even) .solution__media { grid-template-columns: 1fr; }
  .solution:nth-child(even) .solution__media { order: 0; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); gap: 26px; }
}

@media (max-width: 600px) {
  .grid--3, .grid--4, .grid--2 { grid-template-columns: 1fr; }
  .platforms, .metrics, .pricing, .steps, .testimonials { grid-template-columns: 1fr; }
  .footer__top { grid-template-columns: 1fr 1fr; }
  .btn--block-sm { width: 100%; }
  .hero__cta .btn { flex: 1; }
}

/* ---------- 移动端抽屉菜单 ---------- */
.drawer { position: fixed; inset: 0; z-index: 150; visibility: hidden; }
.drawer.open { visibility: visible; }
.drawer__mask { position: absolute; inset: 0; background: rgba(0,0,0,.5); opacity: 0; transition: opacity .3s; }
.drawer.open .drawer__mask { opacity: 1; }
.drawer__panel { position: absolute; top: 0; right: 0; bottom: 0; width: min(82%, 340px); background: var(--bg); box-shadow: var(--shadow-lg); transform: translateX(100%); transition: transform .35s cubic-bezier(.2,.8,.2,1); padding: 22px; overflow-y: auto; }
.drawer.open .drawer__panel { transform: none; }
.drawer__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.drawer__panel nav a { display: block; padding: 14px 4px; font-size: 17px; font-weight: 600; border-bottom: 1px solid var(--border); }
.drawer__panel .btn { margin-top: 22px; }