/* =========================================================
   Voltplant 沃泰朗能源 — 官网样式
   风格：科技专业（深蓝 + 能源绿）
   纯本地，无外部字体/CDN 依赖
   ========================================================= */

:root {
  /* 主色 */
  --navy-900: #061726;
  --navy-800: #0a2540;
  --navy-700: #0e3358;
  --navy-600: #134a7e;
  --blue-500: #0e63c4;
  --blue-400: #2f86e0;
  --green-500: #38a008;  /* 品牌绿 VoltPlant */
  --green-400: #6cc62f;
  --green-600: #2d8205;

  /* 中性 */
  --ink: #0c1b2a;
  --slate-700: #2c3e50;
  --slate-600: #51647a;
  --slate-500: #6b7c91;
  --slate-400: #9aa9bb;
  --slate-300: #c4cedb;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f7fafc;
  --white: #ffffff;

  --bg: #ffffff;
  --bg-soft: #f5f8fc;

  /* 渐变 */
  --grad: linear-gradient(120deg, #2d8b06 0%, #5cbf24 100%);
  --grad-hero: radial-gradient(1200px 600px at 80% -10%, rgba(92,191,36,0.22), transparent 60%),
               radial-gradient(900px 500px at 0% 0%, rgba(47,134,224,0.28), transparent 55%),
               linear-gradient(160deg, var(--navy-900) 0%, var(--navy-800) 55%, var(--navy-700) 100%);

  /* 排版 */
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC",
          Roboto, Helvetica, Arial, sans-serif;

  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --shadow-sm: 0 1px 2px rgba(10,37,64,0.06), 0 2px 8px rgba(10,37,64,0.06);
  --shadow: 0 10px 30px -12px rgba(10,37,64,0.22), 0 4px 12px -6px rgba(10,37,64,0.12);
  --shadow-lg: 0 30px 60px -24px rgba(10,37,64,0.35);
  --ring: 0 0 0 4px rgba(56,160,8,0.18);
  --maxw: 1180px;
  --transition: .22s cubic-bezier(.4,0,.2,1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: var(--blue-500); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--green-600); }

h1, h2, h3, h4 { line-height: 1.25; color: var(--navy-800); margin: 0 0 .5em; font-weight: 800; letter-spacing: -0.01em; }
h2 { font-size: clamp(1.6rem, 1.1rem + 1.8vw, 2.4rem); }
h3 { font-size: 1.3rem; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 通用区块 ---------- */
.section { padding: 84px 0; }
.section--soft { background: var(--bg-soft); }
.section--navy { background: var(--grad-hero); color: #d8e6f5; }
.section--navy h2, .section--navy h3 { color: #fff; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .82rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--green-600); margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--grad); border-radius: 2px; }
.section--navy .eyebrow { color: var(--green-400); }

.section-head { max-width: 760px; margin: 0 auto 52px; text-align: center; }
.section-head.left { margin-left: 0; text-align: left; }
.section-head p { color: var(--slate-600); font-size: 1.08rem; margin: 0; }
.section--navy .section-head p { color: #aebfd4; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 14px 26px; border-radius: 999px; font-weight: 700; font-size: 1rem;
  border: 1.5px solid transparent; cursor: pointer; transition: var(--transition);
  white-space: nowrap; line-height: 1;
}
.btn svg { width: 18px; height: 18px; }
.btn--primary { background: var(--grad); color: #fff; box-shadow: 0 10px 24px -10px rgba(14,99,196,.7); }
.btn--primary:hover { color:#fff; transform: translateY(-2px); box-shadow: 0 16px 30px -10px rgba(56,160,8,.55); }
.btn--ghost { background: rgba(255,255,255,.08); color: #fff; border-color: rgba(255,255,255,.35); }
.btn--ghost:hover { background: rgba(255,255,255,.16); color:#fff; transform: translateY(-2px); }
.btn--outline { background: #fff; color: var(--navy-800); border-color: var(--slate-200); }
.btn--outline:hover { border-color: var(--green-500); color: var(--green-600); transform: translateY(-2px); }
.btn--lg { padding: 17px 34px; font-size: 1.05rem; }
.btn--block { width: 100%; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.82); backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--slate-200);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.brand { display: flex; align-items: center; gap: 11px; }
.brand img { height: 30px; width: auto; }
.brand__text { display: flex; flex-direction: column; line-height: 1.1; padding-left: 11px; border-left: 1px solid var(--slate-200); }
.brand__text b { font-size: 1.05rem; font-weight: 800; color: var(--navy-800); letter-spacing: .01em; }
.brand__text small { font-size: .68rem; color: var(--slate-500); letter-spacing: .06em; }

.nav__links { display: flex; align-items: center; gap: 28px; list-style: none; margin: 0; padding: 0; }
.nav__links a { color: var(--slate-700); font-weight: 600; font-size: .96rem; }
.nav__links a:hover { color: var(--green-600); }
.nav__cta { display: flex; align-items: center; gap: 14px; }
.nav__toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav__toggle span { display: block; width: 24px; height: 2px; background: var(--navy-800); border-radius: 2px; margin: 5px 0; transition: var(--transition); }

/* ---------- Hero ---------- */
.hero { position: relative; background: var(--grad-hero); color: #eaf2fb; overflow: hidden; }
.hero::after {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 46px 46px; mask-image: radial-gradient(900px 500px at 70% 20%, #000, transparent 75%);
  pointer-events: none;
}
.hero__inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; padding: 92px 0 100px; }
.hero h1 { color: #fff; font-size: clamp(2.1rem, 1.3rem + 3vw, 3.5rem); line-height: 1.12; margin-bottom: 20px; }
.hero h1 .grad { background: linear-gradient(100deg,#7ace3f,#7fd0ff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero__lead { font-size: 1.18rem; color: #c3d4ea; max-width: 560px; margin-bottom: 30px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 30px; }
.hero__stats { display: flex; gap: 34px; flex-wrap: wrap; }
.hero__stats div b { display: block; font-size: 1.7rem; font-weight: 800; color: #fff; }
.hero__stats div span { font-size: .86rem; color: #9fb4cf; }

.hero__card {
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--radius-lg); padding: 26px; backdrop-filter: blur(8px);
  box-shadow: var(--shadow-lg);
}
.hero__card h3 { color: #fff; font-size: 1.1rem; margin-bottom: 6px; }
.hero__card p.sub { color: #9fb4cf; font-size: .9rem; margin-bottom: 18px; }
.hero__card .pill { display:flex; align-items:center; gap:12px; padding: 12px 14px; border-radius: 12px; background: rgba(255,255,255,.05); border:1px solid rgba(255,255,255,.1); margin-bottom: 10px; }
.hero__card .pill svg { width: 22px; height: 22px; color: var(--green-400); flex: none; }
.hero__card .pill b { color:#fff; font-size:.95rem; display:block; }
.hero__card .pill span { color:#9fb4cf; font-size:.8rem; }

/* ---------- 信任条 ---------- */
.trustbar { background: var(--navy-900); border-top: 1px solid rgba(255,255,255,.06); }
.trustbar__inner { display: flex; flex-wrap: wrap; gap: 18px 40px; justify-content: center; padding: 22px 0; }
.trustbar__item { display: flex; align-items: center; gap: 10px; color: #b9c9de; font-size: .95rem; font-weight: 600; }
.trustbar__item svg { width: 20px; height: 20px; color: var(--green-400); }

/* ---------- 痛点 ---------- */
.pain-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
.pain {
  background: #fff; border: 1px solid var(--slate-200); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow-sm); transition: var(--transition);
}
.pain:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: #d4e6f6; }
.pain__icon { width: 46px; height: 46px; border-radius: 12px; background: var(--slate-100); display: grid; place-items: center; margin-bottom: 14px; }
.pain__icon svg { width: 24px; height: 24px; color: var(--blue-500); }
.pain h3 { font-size: 1.12rem; margin-bottom: 6px; }
.pain p { color: var(--slate-600); font-size: .96rem; margin: 0; }

/* ---------- 服务卡片 ---------- */
.services-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.svc {
  position: relative; display: flex; flex-direction: column;
  background: #fff; border: 1px solid var(--slate-200); border-radius: var(--radius);
  padding: 26px 24px; box-shadow: var(--shadow-sm); transition: var(--transition); overflow: hidden;
}
.svc::before { content:""; position:absolute; left:0; top:0; height:4px; width:100%; background: var(--grad); opacity:0; transition: var(--transition); }
.svc:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: #cfe3f5; }
.svc:hover::before { opacity:1; }
.svc__num { position:absolute; top:18px; right:20px; font-size:2.4rem; font-weight:800; color: var(--slate-100); line-height:1; }
.svc__icon { width: 52px; height: 52px; border-radius: 14px; background: linear-gradient(135deg, rgba(14,99,196,.12), rgba(56,160,8,.14)); display:grid; place-items:center; margin-bottom: 16px; }
.svc__icon svg { width: 27px; height: 27px; color: var(--blue-500); }
.svc h3 { font-size: 1.16rem; margin-bottom: 8px; padding-right: 28px; }
.svc__desc { color: var(--slate-600); font-size: .95rem; flex: 1; margin-bottom: 18px; }
.svc__price { display:flex; align-items: baseline; gap: 6px; margin-bottom: 16px; }
.svc__price b { font-size: 1.5rem; font-weight: 800; color: var(--navy-800); }
.svc__price b .cny { font-size: 1rem; font-weight: 700; margin-right: 1px; }
.svc__price span { font-size: .85rem; color: var(--slate-500); }
.svc__tag { position:absolute; top:0; left:0; background: var(--grad); color:#fff; font-size:.72rem; font-weight:700; padding: 5px 12px; border-bottom-right-radius: 12px; letter-spacing:.03em; }
.svc__foot { display: flex; gap: 10px; }
.svc__foot .btn { flex: 1; padding: 11px 14px; font-size: .92rem; }
.svc--featured { border-color: var(--green-400); box-shadow: 0 20px 40px -20px rgba(56,160,8,.4); }
.svc--featured::before { opacity:1; }

/* 价格表格备注 */
.price-note { display:flex; align-items:center; gap:8px; font-size:.84rem; color: var(--slate-500); margin-top: 6px; }
.price-note svg { width:15px; height:15px; color: var(--green-600); flex:none; }

/* ---------- 优势 ---------- */
.why-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 22px; }
.why {
  display: flex; gap: 18px; padding: 24px;
  background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.12); border-radius: var(--radius);
}
.why__icon { width: 50px; height: 50px; border-radius: 12px; background: var(--grad); display:grid; place-items:center; flex:none; box-shadow: 0 8px 20px -8px rgba(56,160,8,.6); }
.why__icon svg { width: 26px; height: 26px; color: #fff; }
.why h3 { font-size: 1.12rem; margin-bottom: 6px; color:#fff; }
.why p { color: #aebfd4; font-size: .95rem; margin: 0; }

/* ---------- 流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; counter-reset: step; }
.step { position: relative; padding: 28px 22px; background:#fff; border:1px solid var(--slate-200); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.step__n { width: 44px; height: 44px; border-radius: 12px; background: var(--grad); color:#fff; font-weight:800; font-size:1.2rem; display:grid; place-items:center; margin-bottom: 14px; }
.step h3 { font-size: 1.05rem; margin-bottom: 6px; }
.step p { color: var(--slate-600); font-size: .92rem; margin: 0; }
.step:not(:last-child)::after { content:"→"; position:absolute; right:-16px; top:50%; transform:translateY(-50%); color: var(--slate-300); font-size:1.4rem; z-index:1; }

/* ---------- 数据带 ---------- */
.metrics { display:grid; grid-template-columns: repeat(4,1fr); gap: 24px; text-align:center; }
.metric b { display:block; font-size: 2.6rem; font-weight: 800; background: linear-gradient(100deg,#7ace3f,#7fd0ff); -webkit-background-clip:text; background-clip:text; color:transparent; }
.metric span { color: #aebfd4; font-size: .95rem; }

/* ---------- FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; }
.faq__item { border-bottom: 1px solid var(--slate-200); }
.faq__q { width:100%; text-align:left; background:none; border:0; cursor:pointer; padding: 22px 44px 22px 0; position:relative; font-size: 1.08rem; font-weight: 700; color: var(--navy-800); font-family: inherit; }
.faq__q::after { content:"+"; position:absolute; right: 8px; top:50%; transform:translateY(-50%); font-size:1.5rem; font-weight:400; color: var(--green-600); transition: var(--transition); }
.faq__item.open .faq__q::after { content:"–"; }
.faq__a { max-height:0; overflow:hidden; transition: max-height .3s ease; color: var(--slate-600); }
.faq__a p { padding: 0 0 22px; margin: 0; }
.faq__item.open .faq__a { max-height: 400px; }

/* ---------- CTA / 表单 ---------- */
.cta-wrap { display:grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items:start; }
.cta-copy h2 { color:#fff; }
.cta-copy p { color:#aebfd4; }
.cta-list { list-style:none; padding:0; margin: 22px 0 0; display:grid; gap: 14px; }
.cta-list li { display:flex; align-items:flex-start; gap: 12px; color:#d8e6f5; font-size: 1rem; }
.cta-list li svg { width:22px; height:22px; color: var(--green-400); flex:none; margin-top:1px; }

.form-card { background:#fff; border-radius: var(--radius-lg); padding: 30px; box-shadow: var(--shadow-lg); }
.form-card h3 { font-size: 1.25rem; margin-bottom: 4px; }
.form-card .muted { color: var(--slate-500); font-size: .92rem; margin-bottom: 20px; }
.field { margin-bottom: 16px; }
.field label { display:block; font-size: .9rem; font-weight: 600; color: var(--slate-700); margin-bottom: 6px; }
.field label .req { color:#e2483d; }
.field input, .field select, .field textarea {
  width:100%; padding: 12px 14px; border:1.5px solid var(--slate-200); border-radius: var(--radius-sm);
  font-family: inherit; font-size: .98rem; color: var(--ink); background:#fff; transition: var(--transition);
}
.field textarea { min-height: 92px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline:none; border-color: var(--green-500); box-shadow: var(--ring); }
.field .err { display:none; color:#e2483d; font-size:.82rem; margin-top:5px; }
.field.invalid .err { display:block; }
.field.invalid input, .field.invalid select, .field.invalid textarea { border-color:#e2483d; }
.form-foot { font-size:.82rem; color: var(--slate-500); margin-top: 12px; text-align:center; }

/* 表单成功 + 二维码 */
.form-success { display:none; text-align:center; }
.form-success.show { display:block; animation: pop .4s ease; }
@keyframes pop { from { opacity:0; transform: scale(.96);} to {opacity:1; transform:scale(1);} }
.form-success .check { width:64px; height:64px; border-radius:50%; background: var(--grad); display:grid; place-items:center; margin: 0 auto 14px; }
.form-success .check svg { width:34px; height:34px; color:#fff; }
.qr-row { display:flex; gap: 18px; justify-content:center; flex-wrap:wrap; margin: 22px 0 6px; }
.qr { width: 150px; }
.qr img, .qr .qr-ph { width:150px; height:150px; border-radius: 12px; border:1px solid var(--slate-200); background: var(--slate-50); object-fit:cover; }
.qr .qr-ph { display:grid; place-items:center; text-align:center; color: var(--slate-400); font-size:.78rem; padding: 10px; }
.qr p { font-size:.86rem; font-weight:700; color: var(--navy-800); margin: 8px 0 0; }
.qr small { color: var(--slate-500); font-size:.76rem; }

/* ---------- 页脚 ---------- */
.footer { background: var(--navy-900); color:#9fb4cf; padding: 56px 0 26px; }
.footer__grid { display:grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 36px; }
.footer h4 { color:#fff; font-size: .98rem; margin-bottom: 16px; letter-spacing:.04em; }
.footer ul { list-style:none; padding:0; margin:0; display:grid; gap:10px; }
.footer a { color:#9fb4cf; font-size:.92rem; }
.footer a:hover { color: var(--green-400); }
.footer__brand .brand img { height: 32px; }
.footer__brand .brand__text { border-color: rgba(255,255,255,.18); }
.footer__brand .brand__text b { color:#fff; }
.footer__brand .brand__text small { color:#7e93ad; }
.footer__brand p { font-size:.9rem; margin-top: 14px; max-width: 300px; }
.footer__contact li { display:flex; gap:10px; font-size:.92rem; align-items:flex-start; }
.footer__contact svg { width:17px; height:17px; color: var(--green-400); flex:none; margin-top:3px; }
.footer__bottom { border-top:1px solid rgba(255,255,255,.08); margin-top: 38px; padding-top: 22px; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; font-size:.84rem; color:#6f86a4; }
.footer__bottom a { color:#6f86a4; }

/* ---------- 详情页 ---------- */
.subhero { background: var(--grad-hero); color:#eaf2fb; padding: 56px 0; position:relative; overflow:hidden; }
.subhero::after { content:""; position:absolute; inset:0; background-image: linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px); background-size:46px 46px; mask-image: radial-gradient(700px 400px at 80% 0%,#000,transparent 75%); }
.breadcrumb { position:relative; z-index:1; font-size:.88rem; color:#9fb4cf; margin-bottom: 18px; }
.breadcrumb a { color:#bcd0ea; }
.subhero__inner { position:relative; z-index:1; display:grid; grid-template-columns: 1.3fr .7fr; gap: 40px; align-items:center; }
.subhero h1 { color:#fff; font-size: clamp(1.8rem,1.3rem+1.8vw,2.6rem); margin-bottom: 14px; }
.subhero p { color:#c3d4ea; font-size:1.1rem; max-width: 560px; }
.subhero__badge { display:inline-flex; align-items:center; gap:8px; background:rgba(108,198,47,.16); border:1px solid rgba(108,198,47,.4); color:#cdeeb0; padding:6px 14px; border-radius:999px; font-size:.82rem; font-weight:700; margin-bottom:16px; }

.pricecard { background: rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.18); border-radius: var(--radius-lg); padding: 26px; box-shadow: var(--shadow-lg); }
.pricecard .label { color:#9fb4cf; font-size:.85rem; }
.pricecard .amount { font-size: 2.6rem; font-weight:800; color:#fff; line-height:1.1; margin: 4px 0; }
.pricecard .amount .cny { font-size:1.3rem; }
.pricecard .unit { color:#cdeeb0; font-weight:700; font-size:.95rem; margin-bottom: 16px; }
.pricecard .btn { width:100%; margin-bottom: 10px; }
.pricecard .note { color:#9fb4cf; font-size:.82rem; text-align:center; }

.detail-grid { display:grid; grid-template-columns: 1.6fr .9fr; gap: 44px; align-items:start; }
.prose h2 { font-size: 1.5rem; margin-top: 0; }
.prose h3 { margin-top: 28px; }
.feature-list { list-style:none; padding:0; margin: 0 0 8px; display:grid; gap: 12px; }
.feature-list li { display:flex; gap:12px; align-items:flex-start; color: var(--slate-700); }
.feature-list li svg { width:22px; height:22px; color: var(--green-600); flex:none; margin-top:2px; }
.usecase { display:grid; gap:14px; }
.usecase .uc { display:flex; gap:14px; padding:18px; border:1px solid var(--slate-200); border-radius: var(--radius); background:#fff; }
.usecase .uc svg { width:24px; height:24px; color: var(--blue-500); flex:none; }
.usecase .uc b { display:block; color: var(--navy-800); }
.usecase .uc span { color: var(--slate-600); font-size:.92rem; }

.aside-card { position: sticky; top: 90px; background:#fff; border:1px solid var(--slate-200); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.aside-card h4 { margin-bottom: 14px; }
.aside-card .row { display:flex; justify-content:space-between; padding: 9px 0; border-bottom:1px dashed var(--slate-200); font-size:.94rem; }
.aside-card .row:last-of-type { border-bottom:0; }
.aside-card .row span { color: var(--slate-600); }
.aside-card .row b { color: var(--navy-800); }
.aside-card .btn { margin-top: 16px; }

.related { display:grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.related a.rcard { display:block; padding: 22px; border:1px solid var(--slate-200); border-radius: var(--radius); background:#fff; transition: var(--transition); box-shadow: var(--shadow-sm); }
.related a.rcard:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color:#cfe3f5; }
.related .rcard b { color: var(--navy-800); display:block; margin-bottom:6px; }
.related .rcard span { color: var(--slate-600); font-size:.9rem; }
.related .rcard .p { color: var(--green-600); font-weight:700; margin-top:10px; font-size:.92rem; }

/* ---------- 浮动咨询按钮 ---------- */
.fab { position: fixed; right: 22px; bottom: 22px; z-index: 60; display:flex; flex-direction:column; gap:10px; }
.fab a { width: 54px; height:54px; border-radius:50%; background: var(--grad); display:grid; place-items:center; box-shadow: var(--shadow-lg); transition: var(--transition); }
.fab a:hover { transform: scale(1.08) translateY(-2px); }
.fab a svg { width: 26px; height:26px; color:#fff; }

/* ---------- 杂项 ---------- */
.reveal { opacity:0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity:1; transform:none; }
.text-grad { background: var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent; }
.center { text-align:center; }
.mt-32 { margin-top: 32px; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero__inner { grid-template-columns: 1fr; gap: 36px; padding: 64px 0 72px; }
  .hero__card { max-width: 520px; }
  .subhero__inner { grid-template-columns: 1fr; }
  .detail-grid { grid-template-columns: 1fr; }
  .aside-card { position: static; }
  .cta-wrap { grid-template-columns: 1fr; gap: 30px; }
  .pain-grid, .services-grid, .related { grid-template-columns: repeat(2,1fr); }
  .why-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2,1fr); }
  .step:nth-child(2)::after, .step:not(:last-child)::after { content:""; }
  .metrics { grid-template-columns: repeat(2,1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .section { padding: 60px 0; }
  .nav__links, .nav__cta .btn--outline { display: none; }
  .nav__toggle { display: block; }
  .nav.open .nav__links { display:flex; position:absolute; top:70px; left:0; right:0; flex-direction:column; gap:0; background:#fff; border-bottom:1px solid var(--slate-200); padding: 8px 24px 16px; box-shadow: var(--shadow); }
  .nav.open .nav__links a { padding: 12px 0; border-bottom:1px solid var(--slate-100); width:100%; }
  .pain-grid, .services-grid, .related, .metrics, .steps, .footer__grid { grid-template-columns: 1fr; }
  .hero__stats { gap: 22px; }
  .container { padding: 0 18px; }
}