/* === Tokens =========================================================== */
:root {
  color-scheme: light;
  --bg: #f4f6fb;
  --bg-elev: #ffffff;
  --bg-soft: #f9fafd;
  --border: #e3e7ef;
  --border-strong: #cfd5df;
  --text: #1a1f2c;
  --text-muted: #5a6275;
  --text-soft: #8a93a6;
  --primary: #4f46e5;
  --primary-strong: #3f37c9;
  --primary-soft: #eceaff;
  --accent: #06b6d4;
  --danger: #d04545;
  --success: #1f8a4d;
  --shadow-sm: 0 1px 2px rgba(20, 24, 40, 0.06);
  --shadow: 0 8px 24px rgba(20, 24, 40, 0.08);
  --shadow-lg: 0 20px 60px rgba(20, 24, 40, 0.18);
  --radius: 12px;
  --radius-lg: 18px;
  --radius-pill: 999px;

  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; }

main { flex: 1; }

img { max-width: 100%; display: block; }

p { line-height: 1.7; }

.container {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.muted { color: var(--text-muted); }

.eyebrow {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
}

.eyebrow a { text-decoration: none; }

h1, h2, h3 { color: var(--text); margin: 0; }

h1 { font-size: clamp(34px, 5vw, 56px); line-height: 1.1; letter-spacing: -0.01em; }
h2 { font-size: clamp(22px, 2.4vw, 30px); line-height: 1.25; }
h3 { font-size: 18px; line-height: 1.4; }

/* === Header =========================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
}

.brand__logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
  border-radius: 9px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-nav a {
  text-decoration: none;
  color: var(--text-muted);
  padding: 8px 12px;
  border-radius: 8px;
  transition: background 0.15s, color 0.15s;
}

.site-nav a:hover { color: var(--text); background: var(--bg-soft); }
.site-nav a.is-active { color: var(--primary); background: var(--primary-soft); }

/* === Hero ============================================================= */

.hero {
  position: relative;
  background:
    radial-gradient(1200px 480px at 80% -10%, rgba(79, 70, 229, 0.18), transparent 60%),
    radial-gradient(900px 420px at -10% 30%, rgba(6, 182, 212, 0.12), transparent 60%),
    linear-gradient(180deg, #ffffff, #f4f6fb);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 56px;
  align-items: center;
  padding: 88px 0 96px;
}

.hero__copy { max-width: 620px; }

.hero__summary {
  margin: 22px 0 28px;
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-bottom: 28px;
}

.hero__release-meta {
  font-size: 14px;
  color: var(--text-muted);
  display: inline-flex;
  gap: 10px;
}

.hero__release-meta .dot { color: var(--text-soft); }

.hero__features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero__chip {
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
  box-shadow: var(--shadow-sm);
}

.hero__visual {
  position: relative;
  margin: 0;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: var(--shadow-lg);
}

.hero__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__visual--fallback {
  display: grid;
  place-items: center;
  color: #fff;
}

.hero__fallback { display: none; color: #fff; font-weight: 700; }
.hero__visual--fallback .hero__fallback { display: block; }

/* === Page hero (sub pages) =========================================== */

.page-hero {
  background: linear-gradient(180deg, #ffffff, #f4f6fb);
  border-bottom: 1px solid var(--border);
  padding: 64px 0 48px;
}

.page-hero__lead {
  margin-top: 16px;
  max-width: 640px;
  color: var(--text-muted);
  font-size: 17px;
}

/* === Section / Cards ================================================== */

.section { padding: 56px 0; }

.section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.section__head h2 { letter-spacing: -0.005em; }

.card {
  padding: 24px 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-elev);
  box-shadow: var(--shadow-sm);
}

/* === Buttons ========================================================== */

.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: 10px;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.05s ease, box-shadow 0.15s, background 0.15s;
}

.primary-button {
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.28);
}

.primary-button:hover { background: var(--primary-strong); border-color: var(--primary-strong); }
.primary-button:active { transform: translateY(1px); }

.primary-button--lg { min-height: 52px; padding: 0 28px; font-size: 16px; }

.primary-button--disabled {
  background: var(--border-strong);
  color: #fff;
  border-color: var(--border-strong);
  box-shadow: none;
  cursor: not-allowed;
}

.secondary-button {
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--border-strong);
}

.secondary-button:hover { background: var(--bg-soft); }

.link-button {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border: 0;
  background: transparent;
  color: var(--primary);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
  cursor: pointer;
}

.link-button:hover { background: var(--primary-soft); }
.link-button--danger { color: var(--danger); }
.link-button--danger:hover { background: rgba(208, 69, 69, 0.08); }

/* === Feature grid ===================================================== */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.feature-card {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-elev);
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s, box-shadow 0.15s;
}

.feature-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }

.feature-card__icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 22px;
  margin-bottom: 14px;
}

.feature-card h3 { margin-bottom: 6px; }
.feature-card p { color: var(--text-muted); margin: 0; }

/* === CTA card ========================================================= */

.cta-card {
  display: grid;
  grid-template-columns: 1.4fr auto;
  gap: 32px;
  align-items: center;
  padding: 32px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #1f1c4b, #2c2978 60%, #06b6d4);
  color: #fff;
  box-shadow: var(--shadow);
}

.cta-card .eyebrow { color: rgba(255, 255, 255, 0.8); }
.cta-card h2, .cta-card h3 { color: #fff; }
.cta-card p { color: rgba(255, 255, 255, 0.85); }

.cta-card .secondary-button {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.3);
}
.cta-card .secondary-button:hover { background: rgba(255, 255, 255, 0.2); }

.cta-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 16px 0 20px;
  color: rgba(255, 255, 255, 0.85);
}

.cta-card__qr {
  margin: 0;
  background: #fff;
  padding: 12px;
  border-radius: 12px;
  text-align: center;
  color: var(--text-muted);
}

.cta-card__qr img { width: 160px; height: 160px; object-fit: contain; border-radius: 8px; }
.cta-card__qr figcaption { font-size: 12px; margin-top: 8px; color: var(--text-muted); }

.cta-card--inline {
  background: var(--primary-soft);
  color: var(--text);
  box-shadow: none;
  display: block;
  padding: 20px 24px;
}
.cta-card--inline .eyebrow { color: var(--primary); }
.cta-card--inline p { color: var(--text); }

.cta-card--vertical {
  display: block;
  background: linear-gradient(160deg, #1f1c4b, #2c2978);
  padding: 24px;
  text-align: center;
}

/* === Articles ========================================================= */

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.article-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: var(--shadow-sm);
}

.article-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }

.article-card__cover {
  aspect-ratio: 16 / 9;
  background-size: cover;
  background-position: center;
  background-color: var(--bg-soft);
}

.article-card__body { padding: 18px 20px 20px; }
.article-card__body h3 { margin-bottom: 8px; }
.article-card__body p { margin: 0 0 10px; color: var(--text-muted); }

.article-page__head {
  padding: 56px 0 32px;
}

.article-page__cover {
  margin-top: 24px;
  aspect-ratio: 21 / 9;
  border-radius: var(--radius-lg);
  background-size: cover;
  background-position: center;
}

.article-page__body {
  padding: 24px 0 80px;
  max-width: 760px;
}

/* === Contact page ===================================================== */

.contact-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
  align-items: start;
}

.contact-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.contact-item {
  padding: 18px 20px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.contact-item__label { font-size: 13px; color: var(--text-muted); }

.qr-card {
  margin: 0;
  padding: 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.qr-card img {
  width: 100%;
  max-width: 240px;
  margin: 0 auto;
  border-radius: 12px;
}

.qr-card--sm { padding: 12px; margin-bottom: 12px; }
.qr-card--sm img { max-width: 180px; }

.qr-card figcaption { margin-top: 12px; color: var(--text-muted); font-size: 14px; }

/* === FAQ ============================================================== */

.faq-layout {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 28px;
  align-items: start;
}

.faq-card {
  padding: 32px 36px;
}

/* === Markdown body ===================================================== */

.markdown-body { font-size: 16px; line-height: 1.8; color: var(--text); }
.markdown-body h1 { font-size: 28px; margin: 28px 0 12px; }
.markdown-body h2 { font-size: 22px; margin: 24px 0 12px; }
.markdown-body h3 { font-size: 18px; margin: 20px 0 8px; }
.markdown-body p { margin: 12px 0; }
.markdown-body ul, .markdown-body ol { padding-left: 24px; margin: 12px 0; }
.markdown-body li { margin: 6px 0; }
.markdown-body a { color: var(--primary); }
.markdown-body code {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 6px;
  font-size: 0.92em;
}
.markdown-body pre {
  background: #0f1424;
  color: #e2e8f0;
  border-radius: 12px;
  padding: 18px 20px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.6;
}
.markdown-body pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
}
.markdown-body blockquote {
  margin: 16px 0;
  padding: 4px 16px;
  border-left: 3px solid var(--primary);
  color: var(--text-muted);
  background: var(--bg-soft);
  border-radius: 0 8px 8px 0;
}
.markdown-body img {
  max-width: 100%;
  border-radius: 12px;
  margin: 16px 0;
}
.markdown-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}
.markdown-body th { background: var(--bg-soft); }

/* === Flash ============================================================ */

.flash-stack { margin: 16px auto 0; }
.flash-stack--inline { margin: 0 0 16px; }

.flash {
  margin: 0 0 10px;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  font-size: 14px;
}

.flash--error { border-color: #f0c0bd; color: #9a2823; background: #fff4f3; }
.flash--success { border-color: #b9dec6; color: #145d33; background: #f1faf3; }

/* === Footer =========================================================== */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-muted);
  padding: 24px 0;
  margin-top: 32px;
}

.site-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.site-footer p { margin: 0; }
.site-footer__icp { font-size: 13px; }

/* === Responsive ======================================================= */

@media (max-width: 960px) {
  .hero__inner { grid-template-columns: 1fr; gap: 40px; padding: 56px 0 64px; }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contact-grid, .faq-layout { grid-template-columns: 1fr; }
  .cta-card { grid-template-columns: 1fr; text-align: left; }
  .cta-card__qr { justify-self: start; }
}

@media (max-width: 640px) {
  .site-header__inner { height: auto; flex-direction: column; align-items: flex-start; padding: 12px 0; gap: 8px; }
  .feature-grid, .article-grid { grid-template-columns: 1fr; }
  .contact-list { grid-template-columns: 1fr; }
  .section { padding: 40px 0; }
  .page-hero { padding: 48px 0 32px; }
}