/* Varcolink .cn 站点共用样式。亮色、单主题、零外链、零动效依赖。 */
:root {
  --bg: #F7F9FC;
  --card: #FFFFFF;
  --ink: #0F172A;
  --sub: rgba(15, 23, 42, .66);
  --muted: rgba(15, 23, 42, .5);
  --blue: #2563EB;
  --navy: #1E3A8A;
  --hairline: rgba(15, 23, 42, .08);
  --tint: rgba(37, 99, 235, .05);
  --header-h: 64px;
  --max: 1120px;
  --font: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html { background: var(--bg); color: var(--ink); font-family: var(--font); -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }
body { margin: 0; line-height: 1.7; font-size: 16px; overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--blue); }
img, svg { display: block; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---- header ---- */
.site-header { position: sticky; top: 0; z-index: 10; height: var(--header-h); background: rgba(247, 249, 252, .92); backdrop-filter: saturate(1.2) blur(8px); border-bottom: 1px solid var(--hairline); }
.site-header .wrap { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: .01em; }
.brand img { width: 28px; height: 28px; }
.nav { display: flex; align-items: center; gap: 28px; font-size: 14px; color: var(--sub); }
.nav a.cta { color: #fff; background: var(--blue); padding: 8px 14px; border-radius: 999px; font-weight: 500; }
.nav a.cta:hover { background: #1D4ED8; color: #fff; }
.nav-toggle { display: none; }

/* ---- common blocks ---- */
section { padding: 88px 0; border-top: 1px solid var(--hairline); }
section:first-of-type { border-top: 0; }
.eyebrow { font-family: var(--mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--blue); margin: 0 0 14px; }
.eyebrow::before { content: ""; display: block; width: 34px; height: 1px; background: var(--ink); margin-bottom: 14px; }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -.01em; line-height: 1.25; }
h1 { font-size: clamp(32px, 5vw, 52px); }
h2 { font-size: clamp(24px, 3.2vw, 34px); }
h3 { font-size: 17px; }
.sq { display: inline-block; width: .32em; height: .32em; background: var(--blue); margin-left: .12em; vertical-align: baseline; }
.lede { font-size: 17px; color: var(--sub); max-width: 640px; margin: 18px 0 0; }
.btn { display: inline-block; padding: 12px 22px; border-radius: 999px; font-weight: 500; font-size: 15px; border: 1px solid var(--blue); color: var(--blue); }
.btn:hover { background: var(--tint); }
.btn.solid { background: var(--blue); color: #fff; }
.btn.solid:hover { background: #1D4ED8; color: #fff; }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 30px; }

/* ---- hero ---- */
.hero { padding: 96px 0 80px; }
.hero .lede { font-size: 18px; }

/* ---- grids ---- */
.grid { display: grid; gap: 1px; background: var(--hairline); border: 1px solid var(--hairline); margin-top: 40px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.cell { background: var(--card); padding: 28px 26px; }
.cell:hover { background: #F3F7FF; }
.cell h3 { margin-bottom: 8px; }
.cell p { margin: 0; color: var(--sub); font-size: 15px; }
.cell .num { font-family: var(--mono); font-size: 12px; color: var(--blue); margin-bottom: 12px; }

/* ---- pricing ---- */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 40px; }
.plan { background: var(--card); border: 1px solid var(--hairline); border-radius: 12px; padding: 28px 26px; display: flex; flex-direction: column; }
.plan.featured { border-color: var(--blue); box-shadow: 0 8px 30px rgba(37, 99, 235, .08); }
.plan .flag { font-family: var(--mono); font-size: 11px; letter-spacing: .12em; color: var(--blue); height: 18px; margin-bottom: 8px; }
.plan .name { font-size: 15px; color: var(--sub); }
.plan .price { font-size: 38px; font-weight: 600; letter-spacing: -.02em; margin: 6px 0 2px; }
.plan .price small { font-size: 14px; font-weight: 400; color: var(--muted); margin-left: 4px; }
.plan .fit { color: var(--sub); font-size: 14px; margin-bottom: 20px; }
.plan ul { list-style: none; padding: 0; margin: 0 0 24px; border-top: 1px solid var(--hairline); }
.plan li { padding: 10px 0; border-bottom: 1px solid var(--hairline); font-size: 14px; display: flex; justify-content: space-between; gap: 12px; }
.plan li span:first-child { color: var(--muted); }
.plan li span:last-child { text-align: right; }
.plan .btn { margin-top: auto; text-align: center; }
.notes { margin: 28px 0 0; padding: 0; list-style: none; color: var(--sub); font-size: 14px; display: grid; gap: 6px; }
.notes li::before { content: "·"; color: var(--blue); margin-right: 8px; }

/* ---- steps ---- */
.steps { display: grid; grid-template-columns: 1fr 1.4fr; gap: 40px; margin-top: 40px; align-items: start; }
.steps > * { min-width: 0; }
.step { padding: 18px 0; border-top: 1px solid var(--hairline); }
.step .num { font-family: var(--mono); font-size: 12px; color: var(--blue); }
.step h3 { margin: 4px 0 4px; }
.step p { margin: 0; color: var(--sub); font-size: 15px; }
.term { max-width: 100%; margin: 0; background: #0B1220; color: #D6DEEB; border-radius: 10px; padding: 22px 24px; font-family: var(--mono); font-size: 13.5px; line-height: 1.75; overflow: auto; }
.term .c { color: #7C8DA6; }
.term .k { color: #93C5FD; }
.term .v { color: #22D3EE; }
.term .ok { color: #34D399; }

/* ---- about ---- */
.about { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; margin-top: 32px; }
.about p { margin: 0 0 14px; color: var(--sub); }
.kv { border-top: 1px solid var(--hairline); }
.kv div { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--hairline); font-size: 15px; }
.kv div span:first-child { color: var(--muted); white-space: nowrap; }

/* ---- footer ---- */
.site-footer { border-top: 1px solid var(--hairline); padding: 36px 0 44px; font-size: 13px; color: var(--muted); }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.site-footer .links { display: flex; gap: 20px; flex-wrap: wrap; }
.site-footer .legal a { color: var(--muted); }
.site-footer .legal a:hover { color: var(--blue); }
.site-footer .legal span + span::before { content: "·"; margin: 0 8px; }

/* ---- article pages (docs / changelog / refund) ---- */
.article { max-width: 760px; margin: 0 auto; padding: 72px 24px 96px; }
.article h1 { font-size: clamp(28px, 4vw, 40px); margin-bottom: 10px; }
.article .lede { margin-bottom: 40px; }
.article h2 { font-size: 22px; margin: 44px 0 12px; padding-top: 24px; border-top: 1px solid var(--hairline); }
.article h3 { font-size: 16px; margin: 22px 0 6px; }
.article p, .article li { color: var(--sub); }
.article ol, .article ul { padding-left: 22px; }
.article li { margin: 6px 0; }
.article table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 12px 0 8px; }
.article th, .article td { text-align: left; padding: 10px 10px; border-bottom: 1px solid var(--hairline); vertical-align: top; }
.article th { color: var(--muted); font-weight: 500; }
.article code { font-family: var(--mono); font-size: 13px; background: #EEF2F8; padding: 2px 6px; border-radius: 4px; color: var(--ink); }
.article pre { background: #0B1220; color: #D6DEEB; border-radius: 10px; padding: 18px 20px; font-family: var(--mono); font-size: 13px; line-height: 1.7; overflow: auto; }
.article pre code { background: none; padding: 0; color: inherit; font-size: inherit; }
.log { border-top: 1px solid var(--hairline); }
.log .month { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 22px 0; border-bottom: 1px solid var(--hairline); }
.log .month .d { font-family: var(--mono); font-size: 13px; color: var(--blue); padding-top: 4px; }
.log ul { margin: 0; padding-left: 18px; }

/* ---- responsive ---- */
@media (max-width: 860px) {
  .hero h1 br { display: none; }
  .grid-3, .grid-2, .plans { grid-template-columns: 1fr; }
  .steps, .about { grid-template-columns: 1fr; }
  .nav { gap: 18px; }
  .nav a:not(.cta) { display: none; }
  section { padding: 64px 0; }
  .hero { padding: 64px 0 56px; }
  .log .month { grid-template-columns: 1fr; gap: 6px; }
}
@media print {
  .site-header, .btn, .btn-row { display: none; }
  html { background: #fff; }
}

/* ---- order page ---- */
.order-page { padding: 72px 0 96px; }
.order-page h1 { font-size: clamp(28px, 4vw, 40px); }
.order-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px; margin-top: 40px; align-items: start; }
.order-form { background: var(--card); border: 1px solid var(--hairline); border-radius: 12px; padding: 28px; }
.order-form fieldset { border: 0; padding: 0; margin: 0 0 26px; }
.order-form legend { font-weight: 600; font-size: 15px; margin-bottom: 12px; padding: 0; }
.opt { display: grid; grid-template-columns: 20px 1fr auto; gap: 6px 12px; align-items: center; padding: 12px 14px; border: 1px solid var(--hairline); border-radius: 8px; margin-bottom: 8px; cursor: pointer; }
.opt:has(input:checked) { border-color: var(--blue); background: var(--tint); }
.opt input[type=radio] { grid-column: 1; grid-row: 1; margin: 0; accent-color: var(--blue); }
.opt-name { grid-column: 2; grid-row: 1; font-weight: 500; }
.opt-fit { grid-column: 2; grid-row: 2; font-size: 13px; color: var(--muted); }
.opt-price { grid-column: 3; grid-row: 1 / span 2; align-self: center; font-weight: 600; font-size: 17px; text-align: right; }
.opt-price input { width: 110px; padding: 6px 10px; border: 1px solid var(--hairline); border-radius: 6px; font: inherit; text-align: right; }
.opt-price input:disabled { opacity: .5; }
.order-form input[type=email] { width: 100%; padding: 11px 14px; border: 1px solid var(--hairline); border-radius: 8px; font: inherit; background: #fff; }
.order-form input:focus { outline: 2px solid rgba(37, 99, 235, .35); outline-offset: 1px; border-color: var(--blue); }
.hint { font-size: 13px; color: var(--muted); margin: 8px 0 0; }
.agree { display: block; font-size: 14px; color: var(--sub); margin: 4px 0 20px; }
.agree a { color: var(--blue); }
.agree input { accent-color: var(--blue); margin-right: 6px; }
.total { display: flex; justify-content: space-between; align-items: baseline; padding: 14px 0; border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); margin-bottom: 18px; }
.total strong { font-size: 26px; letter-spacing: -.02em; }
.btn.wide { display: block; width: 100%; text-align: center; border: 0; cursor: pointer; font: inherit; font-weight: 500; font-size: 15px; padding: 13px 22px; }
.order-side h3 { margin: 0 0 10px; }
.order-side h3 + h3, .order-side ol + h3, .order-side ul + h3 { margin-top: 26px; }
.order-side ol, .order-side ul { margin: 0; padding-left: 20px; color: var(--sub); font-size: 14.5px; }
.order-side li { margin: 6px 0; }
.order-side p { color: var(--sub); font-size: 14.5px; margin: 0; }
@media (max-width: 860px) { .order-grid { grid-template-columns: 1fr; } }