/* 单位随手换 · Handy Units — official site
   No external fonts or scripts: the site must load fast in mainland China too. */

:root {
  --canvas: #F5F3EE;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #FFFFFF;
  --line: rgba(29, 29, 31, 0.08);
  --ink: #1D1D1F;
  --ink-2: #55565C;
  --ink-3: #8A8B91;
  --on-ink: #FFFFFF;

  --temp: #F0522E;
  --cur: #12A874;
  --len: #F59E0B;
  --wt: #2F7FEA;
  --gold: #B8873A;
  --gold-2: #E7C27A;

  --glow-a: rgba(240, 82, 46, 0.22);
  --glow-b: rgba(18, 168, 116, 0.20);
  --glow-c: rgba(47, 127, 234, 0.20);
  --glow-d: rgba(245, 158, 11, 0.20);

  --radius: 22px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 12px 40px rgba(30, 30, 40, 0.08);
  --max: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Segoe UI", Roboto, "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #0D0E12;
    --surface: rgba(28, 29, 35, 0.72);
    --surface-solid: #1A1B21;
    --line: rgba(255, 255, 255, 0.09);
    --ink: #F5F5F7;
    --ink-2: #B4B5BC;
    --ink-3: #7E7F87;
    --on-ink: #0D0E12;
    --gold: #E7C27A;
    --gold-2: #B8873A;
    --glow-a: rgba(240, 82, 46, 0.16);
    --glow-b: rgba(18, 168, 116, 0.14);
    --glow-c: rgba(47, 127, 234, 0.16);
    --glow-d: rgba(245, 158, 11, 0.12);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 40px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
button { font: inherit; color: inherit; }

/* Language switching: elements carry lang="zh" / lang="en"; the root's data-lang shows one. */
html[data-lang="zh"] [lang="en"]:not(html),
html[data-lang="en"] [lang="zh"]:not(html) { display: none !important; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

/* Ambient four-color glow, echoing the app icon */
.glow {
  position: fixed; inset: -20vmax; z-index: -1; pointer-events: none;
  background:
    radial-gradient(40vmax 40vmax at 12% 8%, var(--glow-a), transparent 70%),
    radial-gradient(40vmax 40vmax at 92% 6%, var(--glow-b), transparent 70%),
    radial-gradient(44vmax 44vmax at 6% 92%, var(--glow-c), transparent 70%),
    radial-gradient(40vmax 40vmax at 94% 90%, var(--glow-d), transparent 70%);
}

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  background: color-mix(in srgb, var(--canvas) 72%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; gap: 16px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; letter-spacing: -0.01em; }
.brand img { width: 32px; height: 32px; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,.12); }
.nav-links { display: none; gap: 24px; margin-left: auto; }
.nav-links a { text-decoration: none; color: var(--ink-2); font-size: 15px; }
.nav-links a:hover { color: var(--ink); }
.nav-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }
@media (min-width: 860px) {
  .nav-links { display: flex; }
  .nav-actions { margin-left: 24px; }
}
.lang-toggle {
  border: 1px solid var(--line); background: var(--surface); border-radius: 999px;
  padding: 6px 12px; font-size: 14px; cursor: pointer; color: var(--ink-2);
}
.lang-toggle:hover { color: var(--ink); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  border: 0; border-radius: 14px; padding: 12px 20px; cursor: pointer;
  font-weight: 600; font-size: 16px; text-decoration: none; line-height: 1.2;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--ink); color: var(--on-ink); box-shadow: var(--shadow); }
.btn-primary:hover { transform: translateY(-1px); }
.btn-ghost { background: var(--surface); border: 1px solid var(--line); color: var(--ink); }
.btn-small { padding: 8px 14px; font-size: 14px; border-radius: 12px; }
.btn svg { width: 22px; height: 22px; flex: none; }
.store-btn { min-width: 196px; padding: 10px 20px; text-align: left; }
.store-btn small { display: block; font-size: 11px; font-weight: 500; opacity: .75; letter-spacing: .02em; }
.store-btn strong { display: block; font-size: 18px; letter-spacing: -0.01em; }
.store-btn .dl { width: 18px; height: 18px; margin-left: auto; fill: none; stroke: var(--cur); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.store-btn .dl[hidden] { display: none; }
.store-btn.apk { border-color: color-mix(in srgb, var(--cur) 45%, var(--line)); }
.store-btn.apk small { color: var(--cur); opacity: 1; font-weight: 600; }
.btn:focus-visible, .lang-toggle:focus-visible {
  outline: 3px solid var(--wt); outline-offset: 2px;
}

/* ---------- Hero ---------- */
.hero { padding: 48px 0 40px; }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1fr); gap: 48px; align-items: center; }
.hero .wrap > * { min-width: 0; }
@media (min-width: 960px) {
  .hero { padding: 80px 0 72px; }
  .hero .wrap { grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); }
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600;
  padding: 6px 12px; border-radius: 999px; background: var(--surface); border: 1px solid var(--line);
  color: var(--ink-2);
}
.eyebrow i { width: 8px; height: 8px; border-radius: 50%; background: var(--cur); box-shadow: 0 0 0 4px color-mix(in srgb, var(--cur) 20%, transparent); }
h1 {
  font-size: clamp(36px, 7vw, 64px); line-height: 1.08; letter-spacing: -0.03em;
  margin: 20px 0 16px; font-weight: 800;
}
.grad {
  background: linear-gradient(100deg, var(--temp), var(--len) 35%, var(--cur) 65%, var(--wt));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { font-size: clamp(17px, 2.2vw, 20px); color: var(--ink-2); max-width: 34em; margin: 0 0 28px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.pledges { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 28px 0 0; padding: 0; list-style: none; color: var(--ink-2); font-size: 15px; }
.pledges li { display: flex; align-items: center; gap: 8px; }
.pledges li::before { content: ""; width: 18px; height: 18px; border-radius: 50%; flex: none;
  background: var(--cur) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 12.5l4 4 8-9'/%3E%3C/svg%3E") center/12px no-repeat; }

/* ---------- Phone (styles in phone.css) ---------- */
.phone-stage { display: flex; flex-direction: column; align-items: center; position: relative; }
.phone-caption { max-width: 360px; margin: 18px 0 0; font-size: 13px; color: var(--ink-3); text-align: center; }
/* ---------- Sections ---------- */
section { padding: 72px 0; }
@media (min-width: 960px) { section { padding: 104px 0; } }
.section-head { max-width: 680px; margin-bottom: 40px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.kicker { font-size: 14px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
h2 { font-size: clamp(28px, 4.6vw, 44px); line-height: 1.15; letter-spacing: -0.025em; margin: 10px 0 14px; font-weight: 800; }
.section-head p { color: var(--ink-2); font-size: 18px; margin: 0; }

.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
}
.card h3 { font-size: 20px; margin: 16px 0 8px; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--ink-2); font-size: 15.5px; }
.ico {
  width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; color: #fff;
  background: linear-gradient(135deg, var(--a), var(--b));
  box-shadow: 0 6px 16px -6px var(--a);
}
.ico svg { width: 26px; height: 26px; }

.grid-3 { display: grid; gap: 16px; }
@media (min-width: 680px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .grid-3 { grid-template-columns: repeat(3, 1fr); gap: 20px; } }

/* Promise strip */
.promise { padding: 0 0 24px; }
.promise ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; grid-template-columns: repeat(2, 1fr); }
@media (min-width: 860px) { .promise ul { grid-template-columns: repeat(4, 1fr); } }
.promise li { padding: 18px 20px; border-radius: 18px; background: var(--surface); border: 1px solid var(--line); }
.promise strong { display: block; font-size: 20px; letter-spacing: -0.01em; }
.promise span { color: var(--ink-2); font-size: 14px; }

/* ---------- Widgets ---------- */
.widgets-grid { display: grid; gap: 40px; align-items: center; }
@media (min-width: 960px) { .widgets-grid { grid-template-columns: 1fr 1fr; gap: 64px; } }
.feature-list { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 18px; }
.feature-list li { display: grid; grid-template-columns: 40px 1fr; gap: 14px; align-items: start; }
.feature-list .dot { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: var(--surface); border: 1px solid var(--line); }
.feature-list .dot svg { width: 20px; height: 20px; }
.feature-list b { display: block; font-size: 17px; }
.feature-list span { color: var(--ink-2); font-size: 15px; }

/* ---------- Categories ---------- */
.cat-groups { display: grid; gap: 16px; }
@media (min-width: 860px) { .cat-groups { grid-template-columns: repeat(2, 1fr); gap: 20px; } }
.cat-group h3 { margin: 0 0 14px; font-size: 17px; display: flex; justify-content: space-between; align-items: baseline; }
.cat-group h3 small { font-size: 13px; color: var(--ink-3); font-weight: 600; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips > span:not(.chip) {
  padding: 6px 12px; border-radius: 999px; font-size: 14px; font-weight: 500;
  background: color-mix(in srgb, var(--chip, var(--wt)) 12%, transparent);
  color: var(--ink);
  border: 1px solid color-mix(in srgb, var(--chip, var(--wt)) 22%, transparent);
}
/* Category chips with the app's gradient tile and icon */
.chips-icons { gap: 10px 8px; }
.chip {
  display: inline-flex; align-items: center; gap: 8px; padding: 4px 12px 4px 4px; border-radius: 12px;
  font-size: 14px; font-weight: 600;
  /* Same tint as the app's category chips: the category color at 14% */
  background: color-mix(in srgb, var(--t) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--t) 24%, transparent);
  color: color-mix(in srgb, var(--td) 70%, var(--ink));
}
@media (prefers-color-scheme: dark) {
  .chip { background: color-mix(in srgb, var(--t) 16%, transparent); border-color: rgba(255,255,255,.06); color: color-mix(in srgb, var(--tdd) 55%, var(--ink)); }
}
.chip-tile { width: 28px; height: 28px; border-radius: 8px; display: grid; place-items: center; color: #fff; flex: none; box-shadow: 0 2px 6px -2px rgba(0,0,0,.25); }
.chip-tile svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.chip-tile svg.glyph { width: 17px; height: 17px; }

/* ---------- Extension packs ---------- */
.note { margin-top: 20px; font-size: 14px; color: var(--ink-3); text-align: center; }

/* ---------- Download CTA ---------- */
.download {
  text-align: center; border-radius: 32px; padding: 56px 24px; position: relative; overflow: hidden;
  background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow);
}
.download img { width: 96px; height: 96px; border-radius: 22px; margin: 0 auto 20px; box-shadow: 0 12px 30px -10px rgba(0,0,0,.3); }
.download p { color: var(--ink-2); font-size: 18px; margin: 0 auto 28px; max-width: 32em; }
.download .cta-row { justify-content: center; }
.download .req { margin-top: 18px; font-size: 13px; color: var(--ink-3); }

/* ---------- Footer ---------- */
footer { padding: 40px 0 56px; color: var(--ink-3); font-size: 14px; border-top: 1px solid var(--line); margin-top: 72px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; align-items: center; }
footer nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
footer a { text-decoration: none; color: var(--ink-2); }
footer a:hover { color: var(--ink); }
.icp:empty { display: none; }

/* ---------- Modal ---------- */
.modal {
  border: 0; padding: 0; border-radius: 26px; width: min(380px, calc(100% - 32px));
  background: var(--surface-solid); color: var(--ink); box-shadow: 0 30px 80px rgba(0,0,0,.3);
}
.modal::backdrop { background: rgba(10, 10, 15, .45); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
.modal[open] { animation: pop .22s cubic-bezier(.2,.9,.3,1.2); }
@keyframes pop { from { transform: scale(.94); opacity: 0; } to { transform: none; opacity: 1; } }
.modal-body { padding: 32px 28px 24px; text-align: center; }
.modal-body img { width: 72px; height: 72px; border-radius: 17px; margin: 0 auto 16px; }
.modal-body h3 { margin: 0 0 8px; font-size: 21px; }
.modal-body p { margin: 0 0 22px; color: var(--ink-2); font-size: 15.5px; }
.modal-body .btn { width: 100%; }

/* ---------- WeChat "open in browser" overlay ---------- */
.wx-veil {
  position: fixed; inset: 0; z-index: 100; background: rgba(10, 10, 12, .96); color: #fff;
  text-align: center; padding: 96px 24px 0; overflow-y: auto;
}
.wx-veil[hidden] { display: none; }
.wx-arrow { position: absolute; top: 6px; right: 16px; width: 76px; height: 76px; fill: none; stroke: #fff; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.wx-veil h3 { font-size: 21px; margin: 0 0 12px; }
.wx-veil p { font-size: 15.5px; line-height: 1.65; margin: 0 0 8px; color: rgba(255, 255, 255, .88); }
.wx-veil .dots { display: inline-block; background: rgba(255, 255, 255, .2); border-radius: 6px; padding: 0 6px; }
.wx-copy {
  margin-top: 22px; background: none; color: #fff; font: inherit; font-size: 15px; cursor: pointer;
  border: 1px solid rgba(255, 255, 255, .5); border-radius: 12px; padding: 10px 18px; max-width: 100%; overflow-wrap: anywhere;
}
.wx-veil .wx-close { position: absolute; left: 0; right: 0; bottom: max(28px, env(safe-area-inset-bottom)); font-size: 13.5px; color: rgba(255, 255, 255, .6); }

/* ---------- Legal page ---------- */
.legal { padding: 48px 0 24px; }
.legal article { max-width: 760px; margin: 0 auto; }
.legal h1 { font-size: clamp(30px, 5vw, 44px); margin: 0 0 8px; }
.legal .meta { color: var(--ink-3); margin: 0 0 32px; font-size: 14px; }
.legal h2 { font-size: 21px; margin: 32px 0 10px; letter-spacing: -0.01em; }
.legal p, .legal li { color: var(--ink-2); }
.legal ul { padding-left: 1.2em; }
.legal li { margin: 6px 0; }
.legal a { color: var(--wt); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}