:root {
  --bg: #ffffff;
  --bg-soft: #f5f7fa;
  --text: #16181d;
  --muted: #5b6270;
  --line: #e4e7ec;
  --brand: #0f172a;
  --accent: #fe2c55;
  --accent-2: #25f4ee;
  --radius: 14px;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { max-width: 100%; }

/* Language visibility */
html[data-lang="en"] .zh,
html[data-lang="zh"] .en { display: none !important; }
html:not([data-lang]) .zh { display: none !important; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* Header */
.header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header .container { display: flex; align-items: center; gap: 24px; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; text-decoration: none; }
.logo-mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  box-shadow: inset 0 0 0 2px rgba(255,255,255,.35);
}
.nav { display: flex; gap: 22px; margin-left: auto; }
.nav a { text-decoration: none; color: var(--muted); font-size: 15px; }
.nav a:hover { color: var(--text); }
.lang-switch { display: flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.lang-btn {
  border: 0; background: transparent; padding: 6px 12px; font-size: 13px; cursor: pointer; color: var(--muted);
}
.lang-btn[aria-pressed="true"] { background: var(--brand); color: #fff; }
.menu-toggle { display: none; margin-left: auto; background: none; border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; font-size: 18px; cursor: pointer; }

/* Hero */
.hero {
  background:
    radial-gradient(800px 360px at 85% -10%, rgba(37,244,238,.18), transparent 60%),
    radial-gradient(700px 360px at 10% 0%, rgba(254,44,85,.12), transparent 60%),
    var(--bg);
  padding: 96px 0 80px;
}
.eyebrow { display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: .04em; color: var(--accent); background: rgba(254,44,85,.08); padding: 4px 12px; border-radius: 999px; }
.hero h1 { font-size: clamp(32px, 5vw, 52px); line-height: 1.15; margin: 18px 0 18px; letter-spacing: -.02em; max-width: 820px; }
.hero p { font-size: 18px; color: var(--muted); max-width: 680px; margin: 0 0 32px; }
.btns { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-block; padding: 12px 22px; border-radius: 10px; text-decoration: none; font-weight: 600; font-size: 15px; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: #1e293b; }
.btn-ghost { border: 1px solid var(--line); background: #fff; }
.btn-ghost:hover { border-color: #c7ccd4; }

/* Sections */
section { padding: 80px 0; }
.section-soft { background: var(--bg-soft); }
.section-title { font-size: clamp(26px, 3.4vw, 36px); margin: 0 0 12px; letter-spacing: -.01em; }
.section-sub { color: var(--muted); margin: 0 0 40px; max-width: 720px; font-size: 17px; }

.grid { display: grid; gap: 20px; }
.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 { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.card h3 { margin: 14px 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.icon {
  width: 42px; height: 42px; border-radius: 10px; display: grid; place-items: center;
  background: var(--bg-soft); font-size: 20px;
}
.section-soft .icon { background: #fff; border: 1px solid var(--line); }

.about-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: start; }
.facts { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.facts li { display: flex; justify-content: space-between; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.facts li span:first-child { color: var(--muted); }
.facts li span:last-child { text-align: right; font-weight: 500; }

.steps { counter-reset: step; }
.step { position: relative; padding-left: 0; }
.step-num { font-size: 13px; font-weight: 700; color: var(--accent); letter-spacing: .05em; }

.notice {
  border-left: 3px solid var(--accent-2); background: #fff; border-radius: 10px; padding: 18px 20px; margin-top: 28px; font-size: 15px; color: var(--muted);
}
.notice strong { color: var(--text); }

.contact-card { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.contact-card .card a { text-decoration: none; font-weight: 600; word-break: break-all; }
.contact-card .label { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.contact-card .value { margin-top: 6px; font-size: 16px; font-weight: 600; }

/* Footer */
.footer { border-top: 1px solid var(--line); padding: 36px 0; font-size: 14px; color: var(--muted); }
.footer .container { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; }
.footer nav { display: flex; gap: 20px; flex-wrap: wrap; }
.footer a { text-decoration: none; }
.footer a:hover { color: var(--text); }

/* Legal pages */
.legal { padding: 64px 0 80px; }
.legal .container { max-width: 820px; }
.legal h1 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 8px; }
.legal .meta { color: var(--muted); margin: 0 0 36px; font-size: 14px; }
.legal h2 { font-size: 20px; margin: 36px 0 10px; }
.legal p, .legal li { color: #333a45; font-size: 16px; }
.legal ul { padding-left: 22px; }
.legal li { margin: 6px 0; }

/* Callback */
.callback { min-height: 70vh; display: grid; place-items: center; padding: 48px 0; }
.callback .card { max-width: 560px; width: 100%; }
.code-box { display: flex; gap: 8px; margin-top: 16px; }
.code-box input { flex: 1; min-width: 0; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; font-family: ui-monospace, Menlo, monospace; font-size: 14px; }
.code-box button { padding: 10px 16px; border: 0; border-radius: 8px; background: var(--brand); color: #fff; cursor: pointer; }

/* Responsive */
@media (max-width: 900px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .contact-card { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 760px) {
  .menu-toggle { display: block; }
  .nav {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; gap: 0; background: #fff; border-bottom: 1px solid var(--line); margin: 0;
  }
  .nav.open { display: flex; }
  .nav a { padding: 14px 20px; border-top: 1px solid var(--line); }
  .header .container { gap: 12px; }
  .lang-switch { order: 2; }
  .menu-toggle { order: 3; margin-left: 0; }
  .logo { margin-right: auto; }
}
@media (max-width: 560px) {
  .grid-2, .grid-4 { grid-template-columns: 1fr; }
  section { padding: 60px 0; }
  .hero { padding: 64px 0 56px; }
  .container { padding: 0 16px; }
}

/* ===== v2 additions ===== */
.hero-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 48px; align-items: center; }
.hero-points { list-style: none; padding: 0; margin: 28px 0 0; display: flex; flex-wrap: wrap; gap: 10px 22px; color: var(--muted); font-size: 14px; }
.hero-points li::before { content: "✓"; color: var(--accent); font-weight: 700; margin-right: 6px; }

.mock { background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: 0 24px 60px -24px rgba(15,23,42,.25); padding: 22px; }
.mock-head { display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--muted); margin-bottom: 16px; }
.mock-head strong { color: var(--text); font-size: 15px; }
.mock-tag { font-size: 11px; background: var(--bg-soft); border: 1px solid var(--line); padding: 2px 8px; border-radius: 999px; }
.kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 18px; }
.kpi { background: var(--bg-soft); border-radius: 10px; padding: 12px; }
.kpi .k { font-size: 11px; color: var(--muted); }
.kpi .v { font-size: 18px; font-weight: 700; margin-top: 2px; }
.kpi .d { font-size: 11px; color: #12a150; }
.bars { display: flex; align-items: flex-end; gap: 8px; height: 120px; padding: 0 4px; border-bottom: 1px solid var(--line); }
.bars span { flex: 1; border-radius: 6px 6px 0 0; background: linear-gradient(180deg, var(--accent-2), #8be9f5); }
.bars span:nth-child(even) { background: linear-gradient(180deg, var(--accent), #ff8aa1); }
.mock-foot { display: flex; justify-content: space-between; font-size: 11px; color: var(--muted); margin-top: 8px; }

.strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 26px 0; background: #fff; }
.strip .container { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.strip-item { display: flex; gap: 12px; align-items: center; font-size: 14px; }
.strip-item b { display: block; font-size: 15px; }
.strip-item small { color: var(--muted); }

.card ul.ticks { list-style: none; padding: 0; margin: 14px 0 0; display: grid; gap: 6px; }
.card ul.ticks li { font-size: 14px; color: var(--muted); padding-left: 20px; position: relative; }
.card ul.ticks li::before { content: "•"; position: absolute; left: 6px; color: var(--accent); font-weight: 700; }

.process { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; counter-reset: p; }
.process .card { position: relative; padding-top: 30px; }
.process .card::before {
  counter-increment: p; content: "0" counter(p);
  position: absolute; top: -14px; left: 22px; background: var(--brand); color: #fff;
  font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 999px;
}

.why { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.why .card { display: flex; gap: 16px; }
.why .card h3 { margin-top: 0; }

.tags { display: flex; flex-wrap: wrap; gap: 10px; }
.tag { border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 8px 16px; font-size: 14px; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.split h3 { font-size: 18px; margin: 0 0 16px; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; margin-top: 32px; }
table.data { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 560px; }
table.data th, table.data td { text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data th { background: var(--bg-soft); font-weight: 600; }
table.data tr:last-child td { border-bottom: 0; }
.yes { color: #12a150; font-weight: 600; }
.no { color: #c0392b; font-weight: 600; }

.faq { max-width: 860px; }
.faq details { border: 1px solid var(--line); border-radius: 12px; background: #fff; padding: 0 20px; margin-bottom: 12px; }
.faq summary { cursor: pointer; list-style: none; padding: 18px 0; font-weight: 600; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--muted); font-size: 20px; line-height: 1; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0 0 18px; color: var(--muted); }

.cta { background: var(--brand); color: #fff; border-radius: 20px; padding: 48px; display: flex; justify-content: space-between; align-items: center; gap: 24px; flex-wrap: wrap; }
.cta h2 { margin: 0 0 6px; font-size: 28px; }
.cta p { margin: 0; color: #cbd5e1; }
.cta .btn { background: #fff; color: var(--brand); }

.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 28px; align-items: start; }
.contact-list { display: grid; gap: 14px; }
.form { display: grid; gap: 14px; }
.form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form label { font-size: 13px; color: var(--muted); display: grid; gap: 6px; }
.form input, .form select, .form textarea {
  font: inherit; font-size: 15px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--text); width: 100%;
}
.form textarea { min-height: 120px; resize: vertical; }
.form button { justify-self: start; border: 0; cursor: pointer; }
.form .hint { font-size: 12px; color: var(--muted); margin: 0; }

@media (max-width: 1000px) {
  .process { grid-template-columns: repeat(2, 1fr); row-gap: 28px; }
}
@media (max-width: 900px) {
  .hero-grid, .split, .contact-grid, .why { grid-template-columns: 1fr; }
  .strip .container { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .process, .strip .container, .form .row { grid-template-columns: 1fr; }
  .cta { padding: 32px 22px; }
  .kpi .v { font-size: 15px; }
}