/* ==========================================================================
   用道云 890.ai — 官方网站设计系统
   风格基线：参考 Techfast（cutesolution.com/html/techfast）的版块骨架与配色 DNA
   （紫罗兰主色 #7B68EE + 橙 #FF561D 强调 + 深海军蓝 #030821），
   升级为现代 B2B SaaS（Linear / Stripe）的极简与秩序感。
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --brand: #7b68ee;
  --brand-d: #3e57d0;
  --brand-l: #9b8cf2;
  --brand-soft: #f0eeff;
  --accent: #ff561d;
  --accent-d: #d9450f;
  --accent-soft: #fff2ea;
  --cyan: #22d3ee;
  --blue: #2f7cf6;

  --ink: #050a1f;
  --ink-2: #0c1230;
  --ink-3: #171e42;
  --text: #2c3252;
  --muted: #6c7294;
  --muted-2: #9aa0bd;
  --line: #e9ebf6;
  --line-2: #f2f4fb;

  --ok: #10b981;
  --ok-soft: #e7f8f1;
  --warn: #f59f00;
  --warn-soft: #fff6e5;
  --danger: #f0453e;
  --danger-soft: #ffefee;

  --bg: #ffffff;
  --bg-grey: #f7f8f8;
  --kicker: #ff9800;
  --kicker-soft: #fff5e6;
  --card-line: #f3f3f9;
  --bg-dark: #050a1f;

  --grad: linear-gradient(120deg, #7b68ee 0%, #4a7cf7 52%, #22d3ee 100%);
  --grad-warm: linear-gradient(120deg, #ff8a3d 0%, #ff561d 100%);
  --grad-dark: linear-gradient(140deg, #0a1030 0%, #050a1f 55%, #0d1030 100%);

  --r-xs: 4px;
  --r-sm: 5px;
  --r: 6px;
  --r-lg: 8px;
  --r-xl: 10px;

  --sh-xs: 0 2px 8px rgba(15, 20, 60, .05);
  --sh-sm: 0 8px 24px rgba(15, 20, 60, .07);
  --sh: 0 18px 48px rgba(15, 20, 60, .10);
  --sh-lg: 0 34px 80px rgba(58, 44, 190, .18);
  --sh-brand: 0 7px 25px rgba(123, 104, 238, .25);
  --sh-accent: 0 7px 25px rgba(255, 86, 29, .25);

  --maxw: 1200px;
  --header-h: 78px;
  --ease: cubic-bezier(.22, .68, .32, 1);
}

/* ---------- 2. 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 { margin: 0 0 .5em; color: var(--ink); font-weight: 800; line-height: 1.24; letter-spacing: -.015em; }
h1 { font-size: clamp(1.95rem, 4vw, 3.2rem); line-height: 1.18; letter-spacing: -.03em; }
h2 { font-size: clamp(1.65rem, 3.1vw, 2.5rem); letter-spacing: -.025em; }
h3 { font-size: clamp(1.12rem, 1.7vw, 1.4rem); }
h4 { font-size: 1.06rem; }
p { margin: 0 0 1.1em; color: var(--muted); }
a { color: var(--brand); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--brand-d); }
img { max-width: 100%; display: block; height: auto; }
ul, ol { margin: 0; padding: 0; list-style: none; }
strong { color: var(--ink); font-weight: 700; }
em { font-style: normal; }
button { font-family: inherit; }
:focus-visible { outline: 3px solid rgba(123, 104, 238, .45); outline-offset: 2px; border-radius: 6px; }
::selection { background: rgba(123, 104, 238, .2); }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.container-wide { max-width: 1340px; }

/* ---------- 3. 通用工具 ---------- */
.section { padding: 100px 0; position: relative; }
.section-sm { padding: 76px 0; }
.bg-grey { background: var(--bg-grey); }
.bg-dark { background: var(--bg-dark); color: #cfd5ef; }
.bg-dark h1, .bg-dark h2, .bg-dark h3, .bg-dark h4 { color: #fff; }
.bg-dark p { color: #a8b0d4; }
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }
.mt-0 { margin-top: 0; }
.grad-text { color: var(--brand); }
.accent-text { color: var(--accent); }

.section-head { max-width: 780px; margin: 0 auto 65px; text-align: center; }
.section-head.left { margin-left: 0; text-align: left; }
.section-head p { margin-bottom: 0; font-size: 1.03rem; }

.kicker {
  display: block;
  font-size: 15px; font-weight: 700; letter-spacing: .5px; text-transform: uppercase;
  color: var(--kicker); margin-bottom: 15px;
}
.bg-dark .kicker { color: var(--kicker); }

.eyebrow-pill {
  display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 8px 8px 8px 16px; border-radius: 999px;
  background: #fff; border: 1px solid var(--line);
  box-shadow: var(--sh-xs);
  font-size: .84rem; font-weight: 600; color: var(--ink-3);
  margin-bottom: 26px;
}
.eyebrow-pill .sep { width: 1px; height: 14px; background: var(--line); }
.eyebrow-pill .tag-soft {
  padding: 3px 11px; border-radius: 999px; font-size: .76rem; font-weight: 800;
  background: var(--accent-soft); color: var(--accent-d); letter-spacing: .01em;
}
.dot-live { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 4px rgba(16, 185, 129, .16); flex: none; }

/* ---------- 4. 按钮 ---------- */
/* 按钮一律纯色，不使用任何渐变。悬停效果沿用 Techfast 的「中心扩散填充」：伪元素从中心撑满。 */
.btn {
  position: relative; z-index: 1; isolation: isolate; overflow: hidden;
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 14px 34px; border-radius: 30px; border: 1px solid transparent;
  font-size: .95rem; font-weight: 600; letter-spacing: .01em; white-space: nowrap;
  cursor: pointer;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), color .3s var(--ease), border-color .3s var(--ease), background-color .3s var(--ease);
}
.btn::after {
  content: ""; position: absolute; z-index: -1; top: 50%; left: 50%;
  width: 0; height: 0; border-radius: 30px; background-color: var(--btn-fill, transparent);
  transform: translate(-50%, -50%);
  transition: width .5s ease-in-out, height .5s ease-in-out;
}
.btn:hover::after, .btn:focus-visible::after { width: 240%; height: 640px; }
.btn svg { flex: none; }
.btn-primary { --btn-fill: #3e57d0; background-color: var(--brand); color: #fff; box-shadow: var(--sh-brand); }
.btn-primary:hover { transform: translateY(-2px); color: #fff; box-shadow: 0 12px 32px rgba(123, 104, 238, .34); }
.btn-accent { --btn-fill: #d9450f; background-color: var(--accent); color: #fff; box-shadow: var(--sh-accent); }
.btn-accent:hover { transform: translateY(-2px); color: #fff; box-shadow: 0 12px 32px rgba(255, 86, 29, .34); }
.btn-ghost { --btn-fill: var(--accent); background-color: #fff; color: var(--brand); border-color: #e4e1f7; box-shadow: var(--sh-brand); }
.btn-ghost:hover { transform: translateY(-2px); color: #fff; border-color: var(--accent); box-shadow: 0 12px 30px rgba(255, 86, 29, .25); }
.btn-outline-light { --btn-fill: #fff; background-color: rgba(255, 255, 255, .06); color: #fff; border-color: rgba(255, 255, 255, .35); }
.btn-outline-light:hover { color: var(--brand-d); border-color: #fff; }
.btn-sm { padding: 11px 22px; font-size: .88rem; }
.btn-lg { padding: 17px 36px; font-size: 1.02rem; }
.btn-block { width: 100%; }
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.btn-row.center { justify-content: center; }
.btn-note { font-size: .84rem; color: var(--muted-2); }

.link-more { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; font-size: .92rem; }
.link-more svg { transition: transform .22s var(--ease); }
.link-more:hover svg { transform: translateX(4px); }

/* ---------- 5. 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 120;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease);
}
.site-header.is-stuck { box-shadow: 0 8px 30px rgba(15, 20, 60, .07); border-bottom-color: var(--line); }
.header-inner { display: flex; align-items: center; gap: 20px; height: var(--header-h); }

.logo { display: flex; align-items: center; gap: 11px; flex: none; }
.logo-mark { width: 40px; height: 40px; flex: none; }
.logo-wordmark { height: 36px; width: auto; flex: none; }
.logo-tag {
  display: flex; align-items: center; padding-left: 13px; margin-left: 3px;
  border-left: 1px solid var(--line); font-size: .71rem; font-weight: 700;
  color: var(--muted-2); letter-spacing: .04em; white-space: nowrap;
}
.logo-tile {
  width: 42px; height: 42px; flex: none; border-radius: 8px; background: #fff;
  display: grid; place-items: center; padding: 5px; box-shadow: 0 6px 18px rgba(0, 0, 0, .22);
}
.logo-tile img { width: 100%; height: 100%; object-fit: contain; }
.logo-text { display: flex; flex-direction: column; line-height: 1.12; }
.logo-text b { font-size: 1.14rem; font-weight: 900; color: var(--ink); letter-spacing: -.02em; }
.logo-text span { font-size: .68rem; color: var(--muted-2); letter-spacing: .1em; font-weight: 700; }

.nav { margin-left: auto; }
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-item { position: relative; }
.nav-link {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 10px 15px; border-radius: 6px;
  font-size: .93rem; font-weight: 600; color: var(--ink-3); cursor: pointer;
}
.nav-link:hover { color: var(--brand); background: var(--brand-soft); }
.nav-link.active { color: var(--brand-d); background: var(--brand-soft); }
.nav-link .caret { transition: transform .25s var(--ease); opacity: .55; }
.nav-item:hover > .nav-link .caret { transform: rotate(180deg); }

.dropdown {
  position: absolute; top: calc(100% + 10px); left: 50%; transform: translate(-50%, 10px);
  min-width: 306px; padding: 10px; border-radius: var(--r);
  background: #fff; border: 1px solid var(--line);
  box-shadow: 0 26px 60px rgba(15, 20, 60, .16);
  opacity: 0; visibility: hidden; transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
}
.nav-item:hover > .dropdown, .nav-item:focus-within > .dropdown { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.dropdown a { display: flex; gap: 12px; padding: 11px 12px; border-radius: var(--r-sm); color: var(--ink-3); }
.dropdown a:hover { background: var(--bg-grey); color: var(--ink); }
.dropdown .di {
  width: 34px; height: 34px; flex: none; border-radius: 5px; display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand);
}
.dropdown .dt { display: block; font-size: .92rem; font-weight: 700; color: var(--ink); line-height: 1.4; }
.dropdown .dd { display: block; font-size: .79rem; color: var(--muted); line-height: 1.5; font-weight: 500; }

.header-cta { display: flex; align-items: center; gap: 10px; flex: none; }
.header-login { font-size: .93rem; font-weight: 700; color: var(--ink-3); padding: 10px 8px; }
.header-login:hover { color: var(--brand); }

.nav-toggle {
  display: none; width: 44px; height: 44px; border-radius: 6px;
  border: 1px solid var(--line); background: #fff; cursor: pointer;
  align-items: center; justify-content: center; flex-direction: column; gap: 5px;
}
.nav-toggle span { display: block; width: 18px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .25s var(--ease), opacity .2s; }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 6. 首屏 ---------- */
.hero { position: relative; padding: 74px 0 96px; overflow: hidden; background: #fff; }
.hero-glow {
  position: absolute; inset: -20% -10% auto -10%; height: 720px; pointer-events: none; z-index: 0;
  background:
    radial-gradient(46% 52% at 16% 22%, rgba(123, 104, 238, .20), transparent 70%),
    radial-gradient(38% 46% at 84% 12%, rgba(34, 211, 238, .18), transparent 72%),
    radial-gradient(32% 40% at 64% 74%, rgba(255, 86, 29, .13), transparent 70%);
  filter: blur(6px);
}
.hero-grid-lines {
  position: absolute; inset: 0; z-index: 0; pointer-events: none; opacity: .5;
  background-image: linear-gradient(rgba(123, 104, 238, .06) 1px, transparent 1px), linear-gradient(90deg, rgba(123, 104, 238, .06) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: radial-gradient(70% 60% at 50% 30%, #000 20%, transparent 78%);
  mask-image: radial-gradient(70% 60% at 50% 30%, #000 20%, transparent 78%);
}
.hero .container { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.06fr .94fr; gap: 54px; align-items: center; }
.hero h1 { margin-bottom: 22px; }
.hero-sub { font-size: 1.09rem; line-height: 1.85; color: var(--muted); max-width: 620px; margin-bottom: 30px; }
.hero-sub b { color: var(--ink-3); }

.hero-visual { position: relative; }
.hero-canvas {
  position: relative; border-radius: var(--r-lg); padding: 14px;
  background: linear-gradient(150deg, #ffffff 0%, #f4f3ff 100%);
  border: 1px solid var(--line); box-shadow: var(--sh-lg);
}
.hero-shot { border-radius: var(--r); overflow: hidden; background: #0a1030; }
.hero-badge {
  position: absolute; display: flex; align-items: center; gap: 9px;
  padding: 10px 15px; border-radius: 6px; background: #fff;
  box-shadow: 0 16px 40px rgba(15, 20, 60, .16); border: 1px solid var(--line);
  font-size: .82rem; font-weight: 700; color: var(--ink-3); z-index: 3;
}
.hero-badge .hb-ico { width: 30px; height: 30px; border-radius: 5px; display: grid; place-items: center; flex: none; }
.hero-badge small { display: block; font-size: .72rem; font-weight: 600; color: var(--muted-2); line-height: 1.4; }
.hero-badge-1 { top: 26px; left: -30px; animation: float-y 6s ease-in-out infinite; }
.hero-badge-2 { bottom: 92px; right: -26px; animation: float-y 7s ease-in-out infinite .8s; }
.hero-badge-3 { bottom: -18px; left: 42px; animation: float-y 6.5s ease-in-out infinite .4s; }

@keyframes float-y { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-11px); } }

/* 对比切分（传统 vs 用道云） */
.versus { display: grid; grid-template-columns: 1fr auto 1fr; gap: 20px; align-items: stretch; margin-top: 62px; }
.versus-col { border-radius: var(--r); padding: 26px 28px; border: 1px solid var(--line); background: #fff; box-shadow: var(--sh-xs); }
.versus-col.old { background: #fbfbfe; }
.versus-col.new { border-color: rgba(123, 104, 238, .28); background: linear-gradient(160deg, #fff 0%, #f7f5ff 100%); box-shadow: 0 20px 46px rgba(123, 104, 238, .12); }
.versus-title { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ink); margin-bottom: 16px; font-size: .98rem; }
.versus-title .pill { padding: 3px 10px; border-radius: 999px; font-size: .7rem; font-weight: 800; letter-spacing: .04em; }
.versus-col.old .pill { background: #f1f1f7; color: #8b90ad; }
.versus-col.new .pill { background: var(--brand-soft); color: var(--brand-d); }
.versus-list li { display: flex; gap: 11px; padding: 7px 0; font-size: .92rem; color: var(--muted); align-items: flex-start; }
.versus-list li .ic { flex: none; width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; margin-top: 3px; }
.versus-col.old .ic { background: #f0f0f6; color: #9ba0bb; }
.versus-col.new .ic { background: var(--ok-soft); color: var(--ok); }
.versus-arrow { display: grid; place-items: center; }
.versus-arrow span {
  width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center;
  background: var(--brand); color: #fff; box-shadow: var(--sh-brand);
}

/* 信任背书条 */
.trust-bar { margin-top: 62px; padding-top: 38px; border-top: 1px solid var(--line); }
.trust-note { display: flex; flex-wrap: wrap; gap: 14px 34px; justify-content: center; margin-bottom: 30px; }
.trust-note div { display: flex; align-items: center; gap: 9px; font-size: .9rem; font-weight: 600; color: var(--ink-3); }
.trust-note svg { color: var(--ok); flex: none; }
.marquee { position: relative; overflow: hidden; -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); }
.marquee-track { display: flex; gap: 16px; width: max-content; animation: marquee 34s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-item {
  display: flex; align-items: center; gap: 10px; padding: 13px 22px; border-radius: 6px;
  background: #fff; border: 1px solid var(--line); font-size: .86rem; font-weight: 700; color: var(--muted);
  white-space: nowrap;
}
.marquee-item svg { color: var(--brand-l); flex: none; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ---------- 7. 计数器 ---------- */
.counter-band { background: var(--grad-dark); color: #fff; padding: 62px 0; position: relative; overflow: hidden; }
.counter-band::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(50% 80% at 20% 20%, rgba(123, 104, 238, .35), transparent 70%), radial-gradient(40% 70% at 88% 76%, rgba(34, 211, 238, .22), transparent 70%);
  pointer-events: none;
}
.counter-grid { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.counter-item { padding: 6px 12px; border-right: 1px solid rgba(255, 255, 255, .1); }
.counter-item:last-child { border-right: 0; }
.counter-num { font-size: clamp(1.9rem, 3.2vw, 2.6rem); font-weight: 900; letter-spacing: -.03em; color: #fff; line-height: 1.15; font-variant-numeric: tabular-nums; }
.counter-num .unit { font-size: .5em; font-weight: 800; margin-left: 3px; color: var(--brand-l); }
.counter-label { font-size: .86rem; color: #9aa3cc; font-weight: 600; }

/* ---------- 8. 功能卡片 ---------- */
.grid { display: grid; gap: 26px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  position: relative; padding: 35px 30px; border-radius: var(--r);
  background: #fff; border: 1px solid transparent;
  box-shadow: 5px 7px 15px 2px rgba(82, 90, 101, .10);
  transition: transform .4s var(--ease), box-shadow .4s var(--ease), border-color .4s var(--ease);
  height: 100%;
}
.card:hover { transform: translateY(-10px); box-shadow: 5px 12px 26px 2px rgba(82, 90, 101, .16); border-color: rgba(123, 104, 238, .18); }
.card:hover .card-ico { transform: rotateY(180deg); }
.card h3 { margin-bottom: 12px; }
.card p { margin-bottom: 0; font-size: .94rem; }
.card-ico {
  width: 56px; height: 56px; border-radius: 8px; display: grid; place-items: center;
  margin-bottom: 20px; background: var(--brand-soft); color: var(--brand);
  transition: transform .5s var(--ease); will-change: transform;
}
.card-ico.warm { background: var(--accent-soft); color: var(--accent-d); }
.card-ico.ok { background: var(--ok-soft); color: var(--ok); }
.card-ico.blue { background: #eaf2ff; color: var(--blue); }
.card-list { margin-top: 18px; display: grid; gap: 10px; }
.card-list li { display: flex; gap: 10px; font-size: .9rem; color: var(--muted); align-items: flex-start; line-height: 1.65; }
.card-list li > span { min-width: 0; }
.card-list li svg { flex: none; margin-top: 6px; color: var(--brand); }
.card-num {
  position: absolute; top: 24px; right: 26px; font-size: 2.6rem; font-weight: 900;
  color: var(--line); letter-spacing: -.05em; line-height: 1;
}
.card.dark .card-num { color: rgba(255, 255, 255, .08); }

/* 深色卡片 */
.card.dark { background: rgba(255, 255, 255, .045); border-color: rgba(255, 255, 255, .1); backdrop-filter: blur(8px); }
.card.dark:hover { border-color: rgba(155, 140, 242, .5); box-shadow: 0 18px 44px rgba(0, 0, 0, .45); }
.card.dark h3 { color: #fff; }
.card.dark p { color: #a8b0d4; }
.card.dark .card-list li { color: #a8b0d4; }
.card.dark .card-list li svg { color: var(--brand-l); }
.card.dark .card-ico { background: rgba(155, 140, 242, .16); color: var(--brand-l); }

/* ---------- 9. 特性交替版块 ---------- */
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; padding: 74px 0; border-bottom: 1px solid var(--line); }
.feature-row:last-child { border-bottom: 0; }
.feature-row.reverse .feature-media { order: 2; }
.feature-copy h3 { font-size: clamp(1.35rem, 2.3vw, 1.85rem); margin-bottom: 16px; }
.feature-lead { font-size: 1.06rem; font-weight: 700; color: var(--brand-d); margin-bottom: 16px; }
.feature-copy > p { font-size: .98rem; }
.feature-points { display: grid; gap: 16px; margin-top: 26px; }
.feature-points li { display: flex; gap: 14px; }
.feature-points li > span:last-child { min-width: 0; }
.feature-points .fp-ico {
  width: 40px; height: 40px; flex: none; border-radius: 6px; display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand);
}
.feature-points .fp-t { display: block; font-weight: 800; color: var(--ink); font-size: .97rem; margin-bottom: 3px; line-height: 1.5; }
.feature-points .fp-d { display: block; font-size: .89rem; color: var(--muted); line-height: 1.75; }
.feature-media { position: relative; width: 100%; max-width: 500px; margin: 0 auto; }
.feature-shot { border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--line); box-shadow: var(--sh); background: #fff; }
.feature-media .art { border-radius: var(--r-lg); overflow: hidden; background: linear-gradient(150deg, #f7f6ff, #ffffff); border: 1px solid var(--line); box-shadow: var(--sh); padding: 18px; }
.feature-media .art img { border-radius: var(--r-sm); }
.feature-pill {
  position: absolute; bottom: -16px; left: 26px; display: flex; align-items: center; gap: 10px;
  padding: 11px 18px; border-radius: 999px; background: var(--ink); color: #fff;
  font-size: .82rem; font-weight: 700; box-shadow: 0 18px 40px rgba(5, 10, 31, .3);
}
.feature-pill svg { color: var(--cyan); }

/* ---------- 10. 产品 UI 仿真（纯 CSS 面板） ---------- */
.ui {
  border-radius: var(--r); overflow: hidden; background: #fff; border: 1px solid var(--line);
  box-shadow: var(--sh); font-size: 13px;
}
.ui-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; background: #f7f8fd; border-bottom: 1px solid var(--line); }
.ui-bar i { width: 10px; height: 10px; border-radius: 50%; background: #dfe3f2; }
.ui-bar i:nth-child(1) { background: #ff6a5e; }
.ui-bar i:nth-child(2) { background: #ffc14d; }
.ui-bar i:nth-child(3) { background: #46d07f; }
.ui-bar span { margin-left: 8px; font-size: .74rem; color: var(--muted-2); font-weight: 700; letter-spacing: .04em; }
.ui-body { padding: 18px; display: grid; gap: 13px; }
.ui-body.two { grid-template-columns: 1fr 1fr; }

.ui-row { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 6px; background: #fafbff; border: 1px solid var(--line-2); }
.ui-row > span:nth-child(2) { flex: 1; min-width: 0; }
.ui-row .ui-ic { width: 28px; height: 28px; border-radius: 5px; display: grid; place-items: center; flex: none; background: var(--brand-soft); color: var(--brand); font-size: 12px; }
.ui-row .ui-t { display: block; font-weight: 700; color: var(--ink); font-size: .8rem; line-height: 1.5; }
.ui-row .ui-s { display: block; font-size: .7rem; color: var(--muted-2); line-height: 1.5; }
.ui-row .ui-right { margin-left: auto; flex: none; }
.tag { display: inline-flex; align-items: center; gap: 5px; padding: 3px 9px; border-radius: 999px; font-size: .68rem; font-weight: 800; }
.tag.ok { background: var(--ok-soft); color: #0b8a63; }
.tag.warn { background: var(--warn-soft); color: #b57600; }
.tag.danger { background: var(--danger-soft); color: #cf332c; }
.tag.brand { background: var(--brand-soft); color: var(--brand-d); }
.tag.cyan { background: #e6faff; color: #0b7f96; }

.ui-kpi { padding: 14px; border-radius: 6px; background: #fafbff; border: 1px solid var(--line-2); }
.ui-kpi .k { font-size: .7rem; color: var(--muted-2); font-weight: 700; letter-spacing: .04em; }
.ui-kpi .v { font-size: 1.35rem; font-weight: 900; color: var(--ink); letter-spacing: -.02em; font-variant-numeric: tabular-nums; line-height: 1.3; }
.ui-kpi .d { font-size: .7rem; font-weight: 700; color: var(--ok); }

.ui-bars { display: flex; align-items: flex-end; gap: 7px; height: 96px; padding: 12px; border-radius: 6px; background: #fafbff; border: 1px solid var(--line-2); }
.ui-bars i { flex: 1; border-radius: 5px 5px 3px 3px; background: linear-gradient(180deg, #9b8cf2, #7b68ee); animation: grow 1.1s var(--ease) both; }
.ui-bars i.a { background: linear-gradient(180deg, #ffb27d, #ff561d); }
@keyframes grow { from { height: 6% !important; opacity: .2; } }

.ui-progress { height: 8px; border-radius: 999px; background: var(--line-2); overflow: hidden; }
.ui-progress i { display: block; height: 100%; border-radius: 999px; background: var(--brand); }

.ui-runway { position: relative; height: 74px; border-radius: 6px; background: #fafbff; border: 1px solid var(--line-2); overflow: hidden; }
.ui-runway i {
  position: absolute; bottom: 0; left: 0; right: 0; height: 100%;
  background: linear-gradient(90deg, rgba(16, 185, 129, .16), rgba(123, 104, 238, .18), rgba(255, 86, 29, .14));
  clip-path: polygon(0 78%, 18% 66%, 34% 72%, 50% 48%, 66% 55%, 82% 30%, 100% 16%, 100% 100%, 0 100%);
}
.ui-runway b { position: absolute; left: 12px; top: 10px; font-size: .72rem; color: var(--muted-2); font-weight: 700; }
.ui-runway strong { position: absolute; right: 12px; bottom: 8px; font-size: 1.1rem; color: var(--ink); }

.swipe { display: grid; gap: 9px; }
.swipe .sc { display: flex; align-items: center; gap: 10px; padding: 11px 13px; border-radius: 6px; background: #fff; border: 1px solid var(--line); box-shadow: var(--sh-xs); }
.swipe .sc .l { font-size: .78rem; font-weight: 700; color: var(--ink); }
.swipe .sc > span { min-width: 0; flex: 1; }
.swipe .sc .m { font-size: .68rem; color: var(--muted-2); }
.swipe .sc .act { margin-left: auto; display: flex; gap: 6px; }
.swipe .sc .act b { width: 26px; height: 26px; border-radius: 5px; display: grid; place-items: center; font-size: 11px; }
.swipe .sc .act .no { background: var(--danger-soft); color: #cf332c; }
.swipe .sc .act .yes { background: var(--ok-soft); color: #0b8a63; }

/* 审计链 */
.chain { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.chain .node { padding: 7px 12px; border-radius: 5px; background: var(--brand-soft); color: var(--brand-d); font-size: .72rem; font-weight: 800; }
.chain .arrow { color: var(--muted-2); font-size: .8rem; }

/* ---------- 11. 代账机构（深色） ---------- */
.agency-wrap { position: relative; overflow: hidden; }
.agency-wrap::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(46% 60% at 8% 10%, rgba(123, 104, 238, .32), transparent 70%), radial-gradient(40% 50% at 92% 88%, rgba(255, 86, 29, .18), transparent 72%);
}
.agency-wrap .container { position: relative; z-index: 1; }
.agency-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 44px; }
.agency-stat { padding: 22px; border-radius: var(--r); background: rgba(255, 255, 255, .05); border: 1px solid rgba(255, 255, 255, .1); }
.agency-stat b { display: block; font-size: 1.7rem; font-weight: 900; color: #fff; letter-spacing: -.03em; }
.agency-stat span { font-size: .84rem; color: #9aa3cc; }

/* ---------- 12. 定价 ---------- */
.toggle-wrap { display: flex; justify-content: center; margin-bottom: 52px; }
.toggle {
  display: inline-flex; padding: 6px; border-radius: 999px; background: #fff; border: 1px solid var(--line);
  box-shadow: var(--sh-sm); gap: 4px; flex-wrap: wrap; justify-content: center;
}
.toggle button {
  border: 0; background: transparent; padding: 12px 26px; border-radius: 999px; cursor: pointer;
  font-size: .93rem; font-weight: 800; color: var(--muted); transition: all .25s var(--ease);
  display: inline-flex; align-items: center; gap: 8px;
}
.toggle button .save { font-size: .68rem; padding: 2px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent-d); }
.toggle button.active { background: var(--brand); color: #fff; box-shadow: var(--sh-brand); }
.toggle button.active .save { background: rgba(255, 255, 255, .22); color: #fff; }

.plan-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; align-items: stretch; }
.plan-grid.three { grid-template-columns: repeat(3, 1fr); }
.plan {
  position: relative; display: flex; flex-direction: column; padding: 34px 28px 30px;
  border-radius: var(--r-lg); background: #fff; border: 1px solid var(--line);
  box-shadow: var(--sh-xs); transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.plan:hover { transform: translateY(-6px); box-shadow: var(--sh); }
.plan.featured { border: 2px solid var(--brand); background: #fff; box-shadow: 0 30px 70px rgba(123, 104, 238, .20); }
.plan-ribbon {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  padding: 6px 18px; border-radius: 999px; background: var(--accent); color: #fff;
  font-size: .74rem; font-weight: 900; letter-spacing: .06em; white-space: nowrap; box-shadow: var(--sh-accent);
}
.plan-name { font-size: 1.12rem; font-weight: 900; color: var(--ink); margin-bottom: 4px; }
.plan-for { font-size: .84rem; color: var(--muted-2); margin-bottom: 20px; min-height: 42px; }
.plan-price { display: flex; align-items: flex-end; gap: 6px; padding-bottom: 22px; border-bottom: 1px dashed var(--line); margin-bottom: 22px; }
.plan-price .cur { font-size: 1.15rem; font-weight: 800; color: var(--ink); margin-bottom: 8px; }
.plan-price .num { font-size: 2.6rem; font-weight: 900; color: var(--ink); letter-spacing: -.04em; line-height: 1; font-variant-numeric: tabular-nums; }
.plan-price .per { font-size: .84rem; color: var(--muted-2); margin-bottom: 6px; font-weight: 600; }
.plan-feats { display: grid; gap: 11px; margin-bottom: 26px; flex: 1; }
.plan-feats li { display: flex; gap: 10px; font-size: .87rem; color: var(--muted); align-items: flex-start; line-height: 1.6; }
.plan-feats li svg { flex: none; margin-top: 5px; color: var(--ok); }
.plan-feats li b { color: var(--ink-3); font-weight: 700; }
.plan-foot { font-size: .78rem; color: var(--muted-2); text-align: center; margin-top: 12px; }

.compare-wrap { margin-top: 54px; overflow-x: auto; border-radius: var(--r); border: 1px solid var(--line); box-shadow: var(--sh-xs); background: #fff; }
table.compare { width: 100%; border-collapse: collapse; min-width: 820px; font-size: .89rem; }
table.compare th, table.compare td { padding: 15px 18px; text-align: left; border-bottom: 1px solid var(--line-2); }
table.compare thead th { background: #fafbff; font-size: .8rem; font-weight: 800; color: var(--ink); letter-spacing: .02em; white-space: nowrap; }
table.compare thead th.hl { background: var(--brand-soft); color: var(--brand-d); }
table.compare tbody tr:last-child td { border-bottom: 0; }
table.compare tbody tr:hover { background: #fcfcff; }
table.compare td:first-child { font-weight: 700; color: var(--ink-3); }
table.compare td { color: var(--muted); }
table.compare .yes { color: var(--ok); font-weight: 800; }
table.compare .no { color: var(--muted-2); }

/* ---------- 13. 算力透明 ---------- */
.meter { display: grid; gap: 14px; }
.meter-row { display: grid; grid-template-columns: 130px 1fr 74px; gap: 14px; align-items: center; font-size: .82rem; }
.meter-row .ml { font-weight: 700; color: var(--ink-3); }
.meter-row .mv { text-align: right; font-weight: 800; color: var(--ink); font-variant-numeric: tabular-nums; }

/* ---------- 14. 案例 ---------- */
.case { display: grid; grid-template-columns: .9fr 1.1fr; gap: 0; border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--line); box-shadow: var(--sh-sm); background: #fff; margin-bottom: 30px; }
.case-side { padding: 40px 36px; background: var(--grad-dark); color: #fff; position: relative; overflow: hidden; display: flex; flex-direction: column; }
.case-side::after { content: ""; position: absolute; inset: 0; background: radial-gradient(70% 60% at 20% 15%, rgba(123, 104, 238, .4), transparent 70%); }
.case-side > * { position: relative; z-index: 1; }
.case-side h3 { color: #fff; font-size: 1.28rem; margin-bottom: 6px; }
.case-side .meta { font-size: .84rem; color: #9aa3cc; margin-bottom: 22px; }
.case-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.case-tags span { padding: 6px 13px; border-radius: 999px; background: rgba(255, 255, 255, .09); border: 1px solid rgba(255, 255, 255, .14); font-size: .76rem; font-weight: 700; color: #dfe3f7; }
.case-metrics { margin-top: auto; padding-top: 28px; display: grid; gap: 16px; border-top: 1px solid rgba(255, 255, 255, .12); }
.case-metrics .cm { display: flex; align-items: baseline; gap: 10px; }
.case-metrics .cm b { font-size: 1.55rem; font-weight: 900; color: #fff; letter-spacing: -.03em; line-height: 1; font-variant-numeric: tabular-nums; }
.case-metrics .cm span { font-size: .84rem; color: #9aa3cc; }
.case-body { padding: 40px 38px; display: flex; flex-direction: column; gap: 20px; }
.case-block .cb-t { display: flex; align-items: center; gap: 9px; font-weight: 800; color: var(--ink); font-size: .9rem; margin-bottom: 7px; }
.case-block .cb-t .cb-ico { width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; flex: none; }
.case-block p { font-size: .92rem; margin-bottom: 0; }
.quote {
  margin-top: auto; padding: 22px 24px; border-radius: var(--r); background: var(--bg-grey);
  border-left: 3px solid var(--brand); position: relative;
}
.quote p { font-size: .94rem; color: var(--ink-3); font-style: italic; margin-bottom: 14px; }
.quote .who { display: flex; align-items: center; gap: 12px; }
.avatar {
  width: 46px; height: 46px; border-radius: 50%; flex: none; display: grid; place-items: center;
  font-weight: 900; color: #fff; font-size: .95rem; background: var(--brand);
}
.avatar.warm { background: var(--accent); }
/* Techfast 证言头像：白圈 + 对角品牌色描边 */
.quote .avatar { border: 5px solid #fff; border-left-color: var(--brand); border-bottom-color: var(--brand); box-shadow: 0 6px 18px rgba(15, 20, 60, .10); }
.quote .who b { display: block; font-size: .88rem; color: var(--ink); }
.quote .who span { font-size: .78rem; color: var(--muted-2); }

/* ---------- 15. FAQ ---------- */
.faq { display: grid; gap: 18px; max-width: 900px; margin: 0 auto; }
.faq-item { border-radius: 5px; border: 0; border-left: 3px solid var(--brand); background: var(--card-line); overflow: hidden; box-shadow: none; transition: background-color .3s var(--ease), box-shadow .3s var(--ease); }
.faq-item.open { background: var(--brand); box-shadow: 0 12px 30px rgba(123, 104, 238, .22); }
.faq-item.open .faq-q { color: #fff; }
.faq-item.open .faq-a-inner { background: #fff; box-shadow: -1px 5px 20px rgba(82, 90, 101, .10); }
.faq-item.open .faq-q .qn { background: rgba(255, 255, 255, .22); color: #fff; }
.faq-item.open .faq-q .plus::before, .faq-item.open .faq-q .plus::after { background: #fff; }
.faq-q {
  width: 100%; display: flex; align-items: center; gap: 16px; text-align: left;
  padding: 22px 24px; background: transparent; border: 0; cursor: pointer;
  font-size: 1rem; font-weight: 800; color: var(--ink); line-height: 1.6;
}
.faq-q .qn { flex: none; width: 30px; height: 30px; border-radius: 5px; display: grid; place-items: center; background: #fff; color: var(--brand); font-size: .78rem; font-weight: 900; transition: background-color .3s var(--ease), color .3s var(--ease); }
.faq-q .plus { margin-left: auto; flex: none; width: 26px; height: 26px; position: relative; }
.faq-q .plus::before, .faq-q .plus::after { content: ""; position: absolute; background: var(--brand); border-radius: 2px; transition: transform .28s var(--ease), opacity .28s; }
.faq-q .plus::before { left: 0; top: 12px; width: 26px; height: 2px; }
.faq-q .plus::after { left: 12px; top: 0; width: 2px; height: 26px; }
.faq-item.open .faq-q .plus::after { transform: rotate(90deg); opacity: 0; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s var(--ease); }
.faq-a-inner { padding: 22px 24px 26px 70px; font-size: .94rem; color: var(--muted); line-height: 1.85; }
.faq-a-inner b { color: var(--ink-3); }

/* ---------- 16. CTA 带 ---------- */
.cta-band { position: relative; overflow: hidden; background: var(--grad-dark); padding: 78px 0; }
.cta-band::before { content: ""; position: absolute; inset: 0; background: radial-gradient(50% 80% at 12% 20%, rgba(123, 104, 238, .42), transparent 68%), radial-gradient(46% 70% at 88% 80%, rgba(34, 211, 238, .24), transparent 70%); }
.cta-band .container { position: relative; z-index: 1; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.cta-inner h2 { color: #fff; margin-bottom: 10px; }
.cta-inner p { color: #a8b0d4; margin-bottom: 0; max-width: 560px; }

/* ---------- 17. 页脚 ---------- */
.site-footer { background: #03071a; color: #98a0c4; padding: 76px 0 0; font-size: .9rem; }
.footer-top { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 52px; border-bottom: 1px solid rgba(255, 255, 255, .08); }
.footer-brand .logo-text b { color: #fff; }
.footer-brand p { font-size: .87rem; color: #8b93b8; margin: 18px 0 20px; max-width: 300px; }
.footer-col h4 { color: #fff; font-size: .93rem; font-weight: 800; margin-bottom: 18px; letter-spacing: .02em; }
.footer-col ul { display: grid; gap: 11px; }
.footer-col a { color: #98a0c4; font-size: .87rem; }
.footer-col a:hover { color: #fff; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; font-size: .87rem; margin-bottom: 12px; }
.footer-contact svg { color: var(--brand-l); flex: none; margin-top: 4px; }
.footer-certs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.footer-certs span { padding: 5px 11px; border-radius: 4px; background: rgba(255, 255, 255, .05); border: 1px solid rgba(255, 255, 255, .1); font-size: .72rem; color: #9aa3cc; }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; padding: 24px 0 30px; font-size: .82rem; color: #7d85ab; }
.footer-bottom a { color: #7d85ab; }
.footer-bottom a:hover { color: #fff; }
.footer-icp { display: flex; gap: 18px; flex-wrap: wrap; }

/* ---------- 18. 子页 Hero ---------- */
.page-hero { position: relative; padding: 76px 0 66px; background: var(--grad-dark); color: #fff; overflow: hidden; }
.page-hero::before { content: ""; position: absolute; inset: 0; background: radial-gradient(48% 70% at 14% 12%, rgba(123, 104, 238, .42), transparent 68%), radial-gradient(40% 60% at 86% 84%, rgba(34, 211, 238, .2), transparent 72%); }
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { color: #fff; max-width: 860px; }
.page-hero p { color: #a8b0d4; max-width: 700px; font-size: 1.04rem; margin-bottom: 0; }
.breadcrumb { display: flex; align-items: center; gap: 9px; font-size: .84rem; color: #8b93b8; margin-bottom: 20px; }
.breadcrumb a { color: #a8b0d4; }
.breadcrumb a:hover { color: #fff; }

/* ---------- 19. 表单 ---------- */
.form-card { padding: 38px 34px; border-radius: var(--r-lg); background: #fff; border: 1px solid var(--line); box-shadow: var(--sh); }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: .86rem; font-weight: 700; color: var(--ink-3); margin-bottom: 8px; }
.field label .req { color: var(--accent); }
.field input, .field select, .field textarea {
  width: 100%; padding: 13px 16px; border-radius: var(--r-sm); border: 1px solid var(--line);
  background: #fbfbff; font-size: .94rem; color: var(--ink); font-family: inherit; transition: border-color .2s var(--ease), box-shadow .2s var(--ease), background .2s;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: 0; border-color: var(--brand-l); background: #fff; box-shadow: 0 0 0 4px rgba(123, 104, 238, .12); }
.field textarea { min-height: 108px; resize: vertical; }
.form-note { font-size: .78rem; color: var(--muted-2); margin-top: 14px; text-align: center; }
.form-msg { margin-top: 16px; padding: 13px 16px; border-radius: var(--r-sm); font-size: .88rem; font-weight: 600; display: none; }
.form-msg.ok { display: block; background: var(--ok-soft); color: #0b7a58; }
.form-msg.err { display: block; background: var(--danger-soft); color: #c2332c; }

/* ---------- 20. 滚动动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; }
.reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .marquee-track, .hero-badge-1, .hero-badge-2, .hero-badge-3, .ui-bars i { animation: none !important; }
  html { scroll-behavior: auto; }
}

/* ---------- 21. 侧边悬浮咨询 ---------- */
.float-cta {
  position: fixed; right: 20px; bottom: 26px; z-index: 90;
  display: flex; flex-direction: column; gap: 10px;
}
.float-cta a {
  width: 52px; height: 52px; border-radius: 8px; display: grid; place-items: center;
  background: #fff; border: 1px solid var(--line); box-shadow: var(--sh-sm); color: var(--brand);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}
.float-cta a:hover { transform: translateY(-3px); box-shadow: var(--sh); }
.float-cta a.primary { background: var(--brand); color: #fff; border-color: transparent; box-shadow: var(--sh-brand); }

/* ---------- 22. 响应式 ---------- */
@media (max-width: 1140px) {
  .nav-link { padding: 10px 11px; font-size: .89rem; }
  .footer-top { grid-template-columns: 1.4fr 1fr 1fr; }
  .plan-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 1024px) {
  .nav, .header-login, .logo-tag { display: none; }
  .nav-toggle { display: flex; }
  /* backdrop-filter 会为 fixed 后代创建包含块，导致展开菜单被压在顶栏盒子里 → 移动端去掉该效果，
     菜单面板（.nav 绝对定位）才能真正铺满视口。 */
  .site-header { backdrop-filter: none; background: #fff; }
  /* 移动端顶栏：汉堡在左 · Logo 居中 · 试用按钮在右（1fr auto 1fr 保证 Logo 视觉居中） */
  .header-inner { display: grid; grid-template-columns: 1fr auto 1fr; gap: 10px; }
  .header-inner > .nav-toggle { justify-self: start; }
  .header-inner > .logo { justify-self: center; }
  .header-inner > .header-cta { justify-self: end; }
  .site-header.nav-open .nav {
    display: block; position: fixed; top: var(--header-h); left: 0; right: 0; bottom: 0;
    height: auto; background: #fff; padding: 14px 22px 48px; overflow-y: auto; margin: 0;
    border-top: 1px solid var(--line); box-shadow: 0 24px 50px rgba(15, 20, 60, .12); z-index: 5;
  }
  .site-header.nav-open .nav-list { padding-bottom: 24px; }
  .site-header.nav-open .nav-list { flex-direction: column; align-items: stretch; gap: 4px; }
  .site-header.nav-open .nav-item { border-bottom: 1px solid var(--line-2); }
  .site-header.nav-open .nav-link { padding: 16px 4px; font-size: 1rem; justify-content: space-between; }
  .site-header.nav-open .dropdown {
    position: static; transform: none; opacity: 1; visibility: visible; box-shadow: none;
    border: 0; padding: 0 0 12px; min-width: 0; background: transparent;
  }
  .site-header.nav-open .dropdown a { padding: 9px 4px; }
  .hero-grid { grid-template-columns: 1fr; gap: 46px; }
  .hero-visual { max-width: 620px; }
  .hero-badge-1 { left: 0; } .hero-badge-2 { right: 0; }
  .feature-row { grid-template-columns: 1fr; gap: 40px; padding: 56px 0; }
  .feature-row.reverse .feature-media { order: 0; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .case { grid-template-columns: 1fr; }
  .counter-grid { grid-template-columns: repeat(2, 1fr); gap: 30px 24px; }
  .counter-item:nth-child(2) { border-right: 0; }
}
@media (max-width: 860px) {
  .versus { grid-template-columns: 1fr; }
  .versus-arrow { transform: rotate(90deg); }
  .grid-2 { grid-template-columns: 1fr; }
  .plan-grid, .plan-grid.three { grid-template-columns: 1fr; }
  .agency-stats { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .header-inner { gap: 8px; }
  .logo-text span { display: none; }
  .logo-mark { width: 34px; height: 34px; }
  .logo-wordmark { height: 30px; }
  .logo-tag { display: none; }
  .header-cta { gap: 6px; }
  .header-cta .btn { padding: 10px 15px; font-size: .82rem; }
  .nav-toggle { width: 40px; height: 40px; }
  .section { padding: 72px 0; }
  .section-sm { padding: 56px 0; }
  .hero { padding: 44px 0 66px; }
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .btn { width: 100%; }
  .btn-row { flex-direction: column; align-items: stretch; }
  .header-cta .btn { width: auto; }
  .btn-row .btn-note { text-align: center; }
  .counter-grid { grid-template-columns: 1fr; }
  .counter-item { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.1); padding-bottom: 20px; }
  .counter-item:last-child { border-bottom: 0; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .float-cta { right: 12px; bottom: 14px; }
  .float-cta a { width: 46px; height: 46px; }
  .cta-inner .btn { width: 100%; }
  .case-side, .case-body { padding: 30px 24px; }
  .faq-a-inner { padding-left: 24px; }
  .toast { left: 16px; right: 16px; bottom: 16px; }
}

@media (max-width: 400px) {
  /* 窄屏收紧右侧按钮，保证 Logo 在 1fr auto 1fr 网格中仍是视觉正中 */
  .btn-keep { display: none; }
  .logo-wordmark { height: 27px; }
  .header-cta .btn { padding: 9px 12px; font-size: .78rem; }
  .nav-toggle { width: 38px; height: 38px; }
}

/* ---------- 23. Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 30px; transform: translate(-50%, 30px);
  padding: 14px 24px; border-radius: 8px; background: var(--ink); color: #fff;
  font-size: .9rem; font-weight: 700; box-shadow: 0 22px 50px rgba(5, 10, 31, .35);
  opacity: 0; pointer-events: none; transition: opacity .3s var(--ease), transform .3s var(--ease); z-index: 200;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }