/* ===== Withmi shared website styles ===== */
:root {
  --bg: #ffffff;
  --bg-soft: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --text-dim: #515154;
  --text-faint: #86868b;
  --brand: #0066cc;
  --brand-hover: #004f9f;
  --line: #d2d2d7;
  --line-soft: #e8e8ed;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.12);
  --radius: 8px;
  --maxw: 1080px;
  --docw: 860px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue",
    "Segoe UI", "Microsoft YaHei", Roboto, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.58;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-size: 16px;
}

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  color: var(--brand-hover);
  text-decoration: underline;
}

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

/* ===== Navigation ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.nav-inner {
  max-width: var(--maxw);
  min-height: 52px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  font-weight: 600;
  font-size: 17px;
  color: var(--text);
}

.brand:hover {
  color: var(--text);
  text-decoration: none;
}

.brand .logo {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background:
    radial-gradient(circle at 72% 24%, #ffffff 0 10%, transparent 11%),
    linear-gradient(145deg, #111111, #4b4b50);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.16);
  display: inline-block;
}

.nav-links {
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 24px;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
}

.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  color: #3f3f42;
  font-size: 13px;
  line-height: 1;
}

.nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

.lang-switch {
  color: var(--brand) !important;
  background: #f5f5f7;
  border-radius: 999px;
  padding: 7px 12px;
}

/* ===== Hero ===== */
.hero {
  overflow: hidden;
  padding: 96px 0 78px;
  text-align: center;
  background: linear-gradient(180deg, #ffffff 0%, #fbfbfd 52%, #f5f5f7 100%);
}

.hero h1 {
  max-width: 860px;
  margin: 0 auto 20px;
  font-size: 62px;
  font-weight: 700;
  line-height: 1.07;
  letter-spacing: 0;
}

.hero .tagline {
  max-width: 720px;
  margin: 0 auto 34px;
  color: var(--text-dim);
  font-size: 21px;
  line-height: 1.48;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 11px 22px;
  font-weight: 500;
  font-size: 16px;
  line-height: 1;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: #0071e3;
  color: #ffffff;
}

.btn-primary:hover {
  background: #0077ed;
  color: #ffffff;
}

.btn-ghost {
  color: var(--brand);
  padding-left: 16px;
  padding-right: 16px;
}

.btn-ghost::after {
  content: "\203A";
  font-size: 20px;
  line-height: 0;
  transform: translateY(-1px);
}

.btn-ghost:hover {
  color: var(--brand-hover);
}

.product-stage {
  max-width: 780px;
  margin: 68px auto 0;
  display: flex;
  justify-content: center;
}

.phone-shell {
  width: min(368px, 86vw);
  padding: 12px;
  border: 1px solid #d8d8de;
  border-radius: 38px;
  background: #ffffff;
  box-shadow: var(--shadow);
}

.phone-screen {
  aspect-ratio: 9 / 19;
  overflow: hidden;
  border-radius: 28px;
  background: linear-gradient(180deg, #fbfbfd 0%, #f5f5f7 100%);
  color: var(--text);
  text-align: left;
  padding: 22px;
}

.phone-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #6e6e73;
  font-size: 12px;
  font-weight: 600;
}

.phone-pill {
  width: 72px;
  height: 20px;
  border-radius: 999px;
  background: #1d1d1f;
}

.preview-title {
  margin: 34px 0 8px;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.12;
}

.preview-subtitle {
  margin: 0 0 22px;
  color: var(--text-faint);
  font-size: 14px;
}

.preview-list {
  display: grid;
  gap: 10px;
}

.preview-item {
  display: grid;
  grid-template-columns: 22px 1fr;
  align-items: start;
  gap: 10px;
  padding: 12px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.74);
}

.preview-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #0071e3;
  box-shadow: inset 0 0 0 5px #d8ebff;
}

.preview-item strong {
  display: block;
  font-size: 14px;
  line-height: 1.25;
}

.preview-item span {
  display: block;
  margin-top: 3px;
  color: var(--text-faint);
  font-size: 12px;
  line-height: 1.35;
}

.preview-focus {
  margin-top: 16px;
  padding: 16px;
  border-radius: var(--radius);
  background: #1d1d1f;
  color: #ffffff;
}

.preview-focus strong {
  display: block;
  font-size: 13px;
  margin-bottom: 8px;
}

.preview-progress {
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
}

.preview-progress span {
  display: block;
  width: 58%;
  height: 100%;
  border-radius: inherit;
  background: #ffffff;
}

/* ===== Sections ===== */
section {
  padding: 78px 0;
}

section h2 {
  margin: 0 0 12px;
  font-size: 40px;
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0;
}

.section-sub {
  max-width: 680px;
  margin: 0 0 34px;
  color: var(--text-dim);
  font-size: 19px;
  line-height: 1.5;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
}

.feature {
  min-height: 156px;
  background: var(--card);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 26px;
}

.feature .emoji {
  display: none;
}

.feature h3 {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 600;
  line-height: 1.25;
}

.feature p {
  margin: 0;
  color: var(--text-dim);
  font-size: 15.5px;
  line-height: 1.6;
}

/* ===== Document pages ===== */
.doc {
  padding: 72px 0 96px;
  background: #ffffff;
}

.doc .container {
  max-width: var(--docw);
}

.doc h1 {
  margin: 0 0 10px;
  font-size: 48px;
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0;
}

.doc .updated {
  margin: 0 0 40px;
  color: var(--text-faint);
  font-size: 15px;
}

.doc h2 {
  margin: 46px 0 14px;
  padding-top: 8px;
  font-size: 25px;
  font-weight: 650;
  line-height: 1.25;
}

.doc h3 {
  margin: 28px 0 9px;
  font-size: 18px;
  font-weight: 650;
}

.doc p,
.doc li {
  color: #424245;
}

.doc strong {
  color: var(--text);
  font-weight: 650;
}

.doc ul,
.doc ol {
  padding-left: 22px;
}

.doc li {
  margin: 7px 0;
}

.doc code {
  padding: 2px 5px;
  border-radius: 5px;
  background: #f5f5f7;
  color: #1d1d1f;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
}

.doc table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14.5px;
}

.doc th,
.doc td {
  min-width: 180px;
  border: 1px solid var(--line-soft);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.doc th {
  background: var(--bg-soft);
  color: var(--text);
  font-weight: 650;
}

.callout {
  margin: 22px 0;
  padding: 16px 18px;
  border-left: 3px solid var(--brand);
  border-radius: var(--radius);
  background: #f5f9ff;
  color: #424245;
}

.toc {
  margin: 0 0 40px;
  padding: 22px 24px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--bg-soft);
}

.toc strong {
  display: block;
  margin-bottom: 10px;
}

.toc ol {
  margin: 0;
  padding-left: 20px;
}

.toc a {
  color: #424245;
}

/* ===== Contact card ===== */
.contact-card {
  margin: 26px 0;
  padding: 24px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--bg-soft);
}

.contact-card a {
  font-weight: 600;
}

/* ===== Footer ===== */
.footer {
  padding: 36px 0;
  background: var(--bg-soft);
  color: var(--text-faint);
  font-size: 13px;
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.footer a {
  color: #424245;
}

.footer .links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

/* ===== Responsive ===== */
@media (max-width: 760px) {
  .nav-inner {
    padding: 0 16px;
    gap: 14px;
  }

  .nav-links {
    gap: 16px;
  }

  .hero {
    padding: 64px 0 58px;
  }

  .hero h1 {
    font-size: 42px;
    line-height: 1.12;
  }

  .hero .tagline {
    font-size: 18px;
  }

  .product-stage {
    margin-top: 46px;
  }

  section {
    padding: 54px 0;
  }

  section h2 {
    font-size: 32px;
  }

  .section-sub {
    font-size: 17px;
  }

  .feature {
    min-height: auto;
  }

  .doc {
    padding: 52px 0 72px;
  }

  .doc h1 {
    font-size: 38px;
  }
}

@media (max-width: 420px) {
  .container {
    padding: 0 18px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .btn {
    width: 100%;
  }

  .phone-screen {
    padding: 18px;
  }

  .footer .links {
    gap: 14px;
  }
}