/* Site 1 Root — 经典品牌红 · 纵向全宽落地 */
:root {
  --brand: #c8102e;
  --brand-dark: #9a0c24;
  --ink: #1c1917;
  --muted: #57534e;
  --line: #e7e5e4;
  --bg: #fffaf8;
  --panel: #ffffff;
  --accent: #f59e0b;
  --ok: #15803d;
  --radius: 4px;
  --max: 1120px;
  --font-display: "Segoe UI Semibold", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font-family: inherit; cursor: pointer; border: none; }
.wrap { width: min(100% - 40px, var(--max)); margin-inline: auto; }

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Header */
.site-header {
  background: var(--panel);
  border-bottom: 3px solid var(--brand);
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
}
.logo:hover { text-decoration: none; color: var(--brand); }
.logo svg { width: 34px; height: 34px; }
.nav { display: flex; gap: 8px; flex-wrap: wrap; }
.nav a {
  padding: 8px 14px;
  color: var(--muted);
  font-weight: 600;
  border-radius: var(--radius);
  text-decoration: none;
}
.nav a:hover { color: var(--brand); background: #fff1f2; }
.nav a.active {
  color: #fff;
  background: var(--brand);
}

/* Hero — full bleed */
.hero {
  background:
    linear-gradient(135deg, rgba(200,16,46,.92), rgba(154,12,36,.88)),
    repeating-linear-gradient(45deg, transparent, transparent 12px, rgba(255,255,255,.04) 12px, rgba(255,255,255,.04) 24px);
  color: #fff;
  padding: 72px 0 80px;
}
.hero .wrap {
  display: grid;
  gap: 28px;
  max-width: 760px;
}
.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.2;
  letter-spacing: -.02em;
}
.hero .lead {
  margin: 0;
  font-size: 1.125rem;
  opacity: .95;
  max-width: 36em;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: .95rem;
  transition: background .15s ease, color .15s ease, transform .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:disabled { opacity: .7; cursor: wait; transform: none; }
.btn svg { width: 18px; height: 18px; }
.btn-primary { background: #fff; color: var(--brand); }
.btn-primary:hover { background: #fff7ed; }
.btn-ghost {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,.7);
}
.btn-ghost:hover { background: rgba(255,255,255,.12); }
.btn-brand { background: var(--brand); color: #fff; }
.btn-brand:hover { background: var(--brand-dark); }
.btn-line {
  background: transparent;
  color: var(--brand);
  border: 2px solid var(--brand);
}
.btn-line:hover { background: #fff1f2; }

/* Sections */
section { padding: 64px 0; }
.section-head { margin-bottom: 32px; max-width: 40em; }
.section-head h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.25;
}
.section-head p { margin: 0; color: var(--muted); }

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: var(--panel);
}
.feature {
  padding: 28px 24px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.feature svg { width: 36px; height: 36px; color: var(--brand); margin-bottom: 14px; }
.feature h3 { margin: 0 0 8px; font-size: 1.1rem; }
.feature p { margin: 0; color: var(--muted); font-size: .95rem; }

.band {
  background: var(--ink);
  color: #fafaf9;
  padding: 48px 0;
}
.band .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.band h2 { margin: 0 0 8px; font-size: 1.5rem; }
.band p { margin: 0; opacity: .85; }

.compat {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 40px;
  align-items: start;
}
.compat-list { list-style: none; margin: 0; padding: 0; }
.compat-list li {
  display: flex;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.compat-list svg { width: 22px; height: 22px; color: var(--ok); flex-shrink: 0; margin-top: 2px; }
.stat-panel {
  background: linear-gradient(160deg, #fff, #fff1f2);
  border: 1px solid #fecdd3;
  padding: 28px;
}
.stat-panel strong {
  display: block;
  font-size: 2rem;
  color: var(--brand);
  line-height: 1.1;
}
.stat-panel span { color: var(--muted); font-size: .92rem; }

.faq details {
  background: var(--panel);
  border: 1px solid var(--line);
  margin-bottom: 10px;
  padding: 14px 18px;
}
.faq summary {
  font-weight: 700;
  cursor: pointer;
}
.faq details p { margin: 10px 0 0; color: var(--muted); }

.page-hero {
  padding: 48px 0 24px;
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.page-hero h1 {
  margin: 0 0 12px;
  font-size: clamp(1.75rem, 3.5vw, 2.4rem);
  font-family: var(--font-display);
}
.page-hero p { margin: 0; color: var(--muted); max-width: 48em; }

.dl-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 36px 0;
}
.dl-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  padding: 24px;
}
.dl-item h3 {
  margin: 0 0 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
}
.dl-item h3 svg { width: 24px; height: 24px; color: var(--brand); }
.dl-item p { margin: 0 0 16px; color: var(--muted); font-size: .95rem; }
.steps { counter-reset: step; margin: 0; padding: 0; list-style: none; }
.steps li {
  counter-increment: step;
  position: relative;
  padding: 16px 0 16px 52px;
  border-bottom: 1px solid var(--line);
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
}
.article { max-width: 760px; }
.article h2 { margin: 36px 0 12px; font-size: 1.4rem; }
.article p { margin: 0 0 14px; color: #292524; }
.article ul { color: var(--muted); }
.cta-inline {
  margin: 32px 0;
  padding: 24px;
  background: #fff1f2;
  border: 1px solid #fecdd3;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}
.cta-inline p { margin: 0; font-weight: 600; }

.site-footer {
  background: #1c1917;
  color: #d6d3d1;
  padding: 40px 0 28px;
  margin-top: 40px;
  font-size: .9rem;
}
.site-footer a { color: #fda4af; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 28px;
  margin-bottom: 24px;
}
.footer-safe {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 14px 16px;
  background: rgba(255,255,255,.06);
  border-left: 3px solid var(--ok);
}
.footer-safe svg { width: 20px; height: 20px; color: #4ade80; flex-shrink: 0; }
.footer-copy {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 18px;
  color: #a8a29e;
  line-height: 1.6;
}

/* Dense content modules */
.prose-block p { margin: 0 0 14px; color: var(--muted); }
.prose-block p:last-child { margin-bottom: 0; }
.deep-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.deep-grid article {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 22px 24px;
}
.deep-grid h3 { margin: 0 0 10px; font-size: 1.15rem; color: var(--brand-dark); }
.deep-grid p { margin: 0 0 10px; color: var(--muted); font-size: .95rem; }
.deep-grid p:last-child { margin-bottom: 0; }
.platform-board {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.platform-board article {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 20px;
}
.platform-board h3 {
  margin: 0 0 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
}
.platform-board h3 svg { width: 22px; height: 22px; color: var(--brand); }
.platform-board p { margin: 0 0 14px; color: var(--muted); font-size: .94rem; }
.reviews {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.review {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--brand);
  padding: 20px;
  text-align: left;
}
.review p { margin: 0 0 12px; color: #44403c; font-size: .95rem; }
.review footer {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  color: var(--muted);
  font-size: .85rem;
  border: 0;
  padding: 0;
  background: none;
}
.review strong { color: var(--ink); }
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 18px;
}
.stats-row div {
  background: #fff;
  border: 1px solid #fecdd3;
  padding: 18px 14px;
  text-align: center;
}
.stats-row b {
  display: block;
  font-size: 1.5rem;
  color: var(--brand);
  line-height: 1.2;
}
.stats-row span { color: var(--muted); font-size: .85rem; }
.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  font-size: .94rem;
}
.compare-table th, .compare-table td {
  border: 1px solid var(--line);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}
.compare-table th {
  background: #fff1f2;
  color: var(--brand-dark);
}
.compare-table td { color: var(--muted); }
.req-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.req-grid article {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 18px;
}
.req-grid h3 { margin: 0 0 10px; font-size: 1.05rem; }
.req-grid ul { margin: 0; padding-left: 1.1em; color: var(--muted); }
.req-grid li { margin-bottom: 6px; }
.version-list { list-style: none; margin: 0; padding: 0; }
.version-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}
.version-list strong { color: var(--ink); display: block; margin-bottom: 4px; }
.faq details { background: var(--panel); }
.faq details p { line-height: 1.75; }
.article h3 { margin: 22px 0 8px; font-size: 1.15rem; color: var(--brand-dark); }
.section-lead { margin: 0 0 22px; color: var(--muted); max-width: 48em; }

@media (max-width: 860px) {
  .features { grid-template-columns: 1fr; }
  .compat, .dl-grid, .footer-grid,
  .deep-grid, .platform-board, .reviews, .stats-row, .req-grid { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 56px; }
}