/* Dowei — doweiapp.com
   Plain static CSS. No trackers, no cookies, no external fonts. */

:root {
  --bg: #f7f6f4;
  --bg-elev: #ffffff;
  --bg-muted: #efeeeb;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #86868b;
  --line: rgba(29, 29, 31, 0.1);
  --accent: #0a6fcf;
  --accent-hover: #085aa8;
  --accent-soft: rgba(10, 111, 207, 0.1);
  --chip: #eef4fb;
  --chip-text: #0a5aaa;
  --chip-muted: #ececea;
  --chip-muted-text: #6e6e73;
  --safety-bg: #f3f1ea;
  --safety-line: rgba(80, 64, 24, 0.16);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 12px 32px rgba(0, 0, 0, 0.06);
  --radius: 20px;
  --radius-sm: 12px;
  --wrap: 1080px;
  --prose: 42rem;
  --header-h: 3.5rem;
  --focus: 0 0 0 3px var(--bg), 0 0 0 5px var(--accent);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --bg-elev: #141c2c;
    --bg-muted: #101827;
    --text: #f5f5f7;
    --text-secondary: #a8b0be;
    --text-tertiary: #8b93a3;
    --line: rgba(245, 245, 247, 0.12);
    --accent: #7ab3f5;
    --accent-hover: #9ac6f8;
    --accent-soft: rgba(122, 179, 245, 0.12);
    --chip: rgba(122, 179, 245, 0.14);
    --chip-text: #c5ddfa;
    --chip-muted: rgba(255, 255, 255, 0.06);
    --chip-muted-text: #a8b0be;
    --safety-bg: #1a1d18;
    --safety-line: rgba(212, 196, 140, 0.22);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 16px 40px rgba(0, 0, 0, 0.35);
    --focus: 0 0 0 3px var(--bg), 0 0 0 5px var(--accent);
  }
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Segoe UI", "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB",
    "Noto Sans CJK SC", "Noto Sans SC", "Microsoft YaHei", "Noto Sans", sans-serif;
  font-size: 17px;
  line-height: 1.47;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.lang-zh {
  line-height: 1.7;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--accent-hover); }
:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 6px; }

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--bg-elev);
  color: var(--text);
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  z-index: 100;
}
.skip:focus { top: 0.75rem; }

.wrap {
  width: min(calc(100% - 2.5rem), var(--wrap));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: min(calc(100% - 2.5rem), var(--wrap));
  margin-inline: auto;
}

.wordmark {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}
.wordmark:hover { color: var(--text); opacity: 0.72; }
.wordmark .zh-mark {
  font-weight: 500;
  font-size: 0.86rem;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.15rem 1.15rem;
  margin-left: auto;
  font-size: 0.94rem;
}
.nav a {
  color: var(--text-secondary);
  text-decoration: none;
}
.nav a:hover,
.nav a[aria-current="page"] { color: var(--text); }

.lang {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin-left: 0.75rem;
  padding-left: 0.9rem;
  border-left: 1px solid var(--line);
  font-size: 0.86rem;
  white-space: nowrap;
}
.lang a {
  color: var(--text-tertiary);
  text-decoration: none;
  padding: 0.2rem 0.4rem;
  border-radius: 6px;
}
.lang a:hover { color: var(--text); }
.lang a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

/* Main */
main { flex: 1 0 auto; }

/* Home hero */
.hero {
  padding: 5.5rem 0 3.25rem;
  text-align: center;
}
.hero h1 {
  margin: 0;
  font-size: clamp(3.25rem, 9vw, 6rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 1;
}
.hero .aka {
  margin: 0.85rem 0 0;
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--text-secondary);
}
.hero .lead {
  margin: 1.5rem auto 0;
  max-width: 28rem;
  font-size: 1.2rem;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
}

body.lang-zh .hero .aka { letter-spacing: 0.28em; }

/* Product grid */
.section { padding: 1rem 0 5rem; }
.section-label {
  margin: 0 0 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
@media (min-width: 740px) {
  .cards { grid-template-columns: 1fr 1fr; }
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.35rem;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  min-height: 13.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
a.card:hover {
  color: inherit;
  transform: translateY(-2px);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05), 0 18px 40px rgba(0, 0, 0, 0.08);
}
@media (prefers-color-scheme: dark) {
  a.card:hover {
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3), 0 18px 40px rgba(0, 0, 0, 0.4);
  }
}
/* Cards with no app icon: keep the chip on the right and align titles with icon cards. */
.card-top:not(:has(picture)) {
  min-height: 64px;
  justify-content: flex-end;
  align-items: flex-start;
}
.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}
.card-icon {
  width: 64px;
  height: 64px;
  flex-shrink: 0;
  filter: drop-shadow(0 6px 12px rgba(10, 111, 207, 0.22));
}
.card h2 {
  margin: 0.4rem 0 0;
  font-size: 1.45rem;
  letter-spacing: -0.03em;
  font-weight: 600;
  line-height: 1.2;
}
.card .subname {
  margin: 0.2rem 0 0;
  color: var(--text-secondary);
  font-size: 1rem;
}
.card p {
  margin: 0;
  color: var(--text-secondary);
  flex: 1;
}
.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 0.5rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.22rem 0.65rem;
  border-radius: 999px;
  background: var(--chip);
  color: var(--chip-text);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.chip.muted {
  background: var(--chip-muted);
  color: var(--chip-muted-text);
  font-weight: 500;
}
.more {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--accent);
}
a.card:hover .more { color: var(--accent-hover); }

/* Product page */
.product-hero {
  padding: 3.5rem 0 2.5rem;
  display: grid;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 800px) {
  .product-hero {
    grid-template-columns: 1.15fr 0.85fr;
    padding: 4.5rem 0 3rem;
    gap: 3rem;
  }
}
.eyebrow {
  margin: 0 0 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}
.product-hero h1 {
  margin: 0;
  font-size: clamp(2.15rem, 5vw, 3.35rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.08;
}
.product-hero .aka {
  margin: 0.55rem 0 0;
  font-size: 1.15rem;
  color: var(--text-secondary);
}
.product-hero .lead {
  margin: 1.25rem 0 0;
  font-size: 1.12rem;
  color: var(--text-secondary);
  max-width: 38rem;
}

.product-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1rem;
}
.product-visual img {
  width: min(220px, 58vw);
  height: auto;
  filter: drop-shadow(0 18px 40px rgba(10, 111, 207, 0.28));
}

.features {
  display: grid;
  gap: 0.9rem;
  padding: 0 0 2.5rem;
}
@media (min-width: 740px) {
  .features { grid-template-columns: 1fr 1fr; }
}
.feature {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1.2rem 1.25rem 1.15rem;
}
.feature h2 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.feature p, .feature ul {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.98rem;
}
.feature ul {
  padding-left: 1.15rem;
}
.feature li { margin: 0.15rem 0; }
.langs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.7rem;
}
.langs span {
  display: inline-block;
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  background: var(--bg-muted);
  border: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--text);
}
.feature .follow { margin-top: 0.85rem; }

.safety {
  margin: 0 0 3rem;
  padding: 1.1rem 1.2rem;
  background: var(--safety-bg);
  border: 1px solid var(--safety-line);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.98rem;
}
.safety strong { font-weight: 600; }
.safety p { margin: 0; }

.page-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  padding: 0 0 4rem;
  font-size: 0.98rem;
}

/* Prose (privacy, support intro) */
.page-head {
  padding: 3rem 0 1.5rem;
  max-width: var(--prose);
}
.page-head h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.page-head .meta {
  margin: 0.8rem 0 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}
.prose {
  max-width: var(--prose);
  padding-bottom: 4.5rem;
}
.prose h2 {
  margin: 2.1rem 0 0.6rem;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.prose p { margin: 0 0 0.9rem; color: var(--text); }
.prose p.note, .prose .note { color: var(--text-secondary); font-size: 0.95rem; }
.prose ul, .prose ol { margin: 0 0 1rem; padding-left: 1.25rem; }
.prose li { margin: 0.3rem 0; }
.prose li::marker { color: var(--text-tertiary); }

/* FAQ */
.faq {
  max-width: var(--prose);
  display: grid;
  gap: 0.65rem;
  padding-bottom: 1.5rem;
}
.faq details {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0;
}
.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 1rem 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  float: right;
  width: 0.55rem;
  height: 0.55rem;
  margin-top: 0.4rem;
  border-right: 1.5px solid var(--text-secondary);
  border-bottom: 1.5px solid var(--text-secondary);
  transform: rotate(45deg);
  transition: transform 0.15s ease;
}
.faq details[open] summary::after {
  transform: rotate(225deg);
  margin-top: 0.55rem;
}
.faq .ans {
  padding: 0 1.15rem 1.15rem;
  color: var(--text-secondary);
}
.faq .ans p, .faq .ans ol, .faq .ans ul { margin: 0 0 0.7rem; }
.faq .ans :last-child { margin-bottom: 0; }
.faq .ans ol, .faq .ans ul { padding-left: 1.2rem; }
.contact-block {
  max-width: var(--prose);
  padding: 0 0 4.5rem;
}
.contact-block h2 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.2rem;
  font-weight: 600;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.25rem 0 2.5rem;
  color: var(--text-secondary);
  font-size: 0.88rem;
}
.footer-inner {
  display: grid;
  gap: 1rem;
}
@media (min-width: 700px) {
  .footer-inner {
    grid-template-columns: 1fr auto;
    align-items: start;
  }
}
.footer-brand {
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}
.footer-brand span {
  font-weight: 500;
  color: var(--text-secondary);
  margin-left: 0.4rem;
}
.site-footer p { margin: 0.35rem 0 0; max-width: 36rem; }
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.1rem;
}
.footer-nav a {
  color: var(--text-secondary);
  text-decoration: none;
}
.footer-nav a:hover { color: var(--text); }
.fineprint {
  margin-top: 1.25rem !important;
  color: var(--text-tertiary);
  font-size: 0.8rem;
}

/* 404 */
.lost {
  padding: 6rem 0 7rem;
  text-align: center;
}
.lost h1 {
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 4rem);
  letter-spacing: -0.04em;
  font-weight: 600;
}
.lost p { color: var(--text-secondary); margin: 1rem auto 0; max-width: 26rem; }
.lost .actions { margin-top: 1.75rem; display: flex; justify-content: center; gap: 1.25rem; }

@media (max-width: 700px) {
  .header-inner { width: min(calc(100% - 1.5rem), var(--wrap)); }
  .wrap { width: min(calc(100% - 1.5rem), var(--wrap)); }
  .nav { gap: 0.15rem 0.85rem; font-size: 0.88rem; }
  .lang { margin-left: 0.4rem; padding-left: 0.65rem; }
  .hero { padding: 3.75rem 0 2.25rem; }
  .product-hero { padding: 2.5rem 0 1.75rem; }
  .page-head { padding-top: 2.25rem; }
  /* Wordmark stays; collapse Chinese mark on very small if needed */
}

@media (max-width: 520px) {
  .wordmark .zh-mark { display: none; }
  .nav a[data-short]::after { content: attr(data-short); }
  .nav a[data-short] { font-size: 0; }
  .nav a[data-short]::after { font-size: 0.88rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  a.card, .faq summary::after { transition: none; }
  a.card:hover { transform: none; }
}