:root {
  color-scheme: light;
  --ink: #17201b;
  --muted: #637066;
  --line: #d9ded6;
  --paper: #fbfaf4;
  --panel: #ffffff;
  --mint: #c9f2d0;
  --green: #1d7f4b;
  --amber: #d49a2a;
  --clay: #b95c3d;
  --blue: #315f86;
  --shadow: 0 18px 48px rgba(23, 32, 27, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(90deg, rgba(23, 32, 27, 0.045) 1px, transparent 1px),
    linear-gradient(180deg, rgba(23, 32, 27, 0.045) 1px, transparent 1px),
    var(--paper);
  background-size: 28px 28px;
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", "Noto Serif SC", "Songti SC", serif;
  line-height: 1.75;
}

a {
  color: var(--green);
  text-underline-offset: 4px;
}

.shell {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(23, 32, 27, 0.12);
  background: rgba(251, 250, 244, 0.9);
  backdrop-filter: blur(16px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 24px;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.mark {
  width: 42px;
  height: 42px;
  border: 1px solid var(--ink);
  display: grid;
  place-items: center;
  background: var(--mint);
  font-family: Georgia, serif;
  font-weight: 800;
}

.brand-lockup strong {
  display: block;
  font-size: 15px;
  letter-spacing: 0;
}

.brand-lockup span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

.nav-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: flex-end;
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}

.nav-links a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.nav-links a:hover {
  border-color: var(--ink);
}

.hero {
  padding: 70px 0 54px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.72fr);
  gap: 46px;
  align-items: stretch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
}

h1 {
  margin: 20px 0 18px;
  max-width: 900px;
  font-size: clamp(42px, 8vw, 96px);
  line-height: 0.98;
  letter-spacing: 0;
}

.lead {
  max-width: 780px;
  color: #38443b;
  font-size: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  text-decoration: none;
}

.button.secondary {
  background: transparent;
  color: var(--ink);
}

.fact-panel {
  min-height: 100%;
  border: 1px solid var(--ink);
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 22px;
}

.fact-panel h2,
.section h2 {
  margin: 0 0 14px;
  font-size: 30px;
  line-height: 1.15;
  letter-spacing: 0;
}

.proof {
  padding: 14px;
  border: 1px dashed var(--clay);
  background: #fff6ec;
  color: #64311f;
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  word-break: break-word;
}

.matrix {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.matrix-row {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  background: #fbfbf8;
}

.matrix-row strong {
  color: var(--blue);
}

.section {
  padding: 44px 0;
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.card {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.86);
  padding: 22px;
}

.card.accent {
  border-color: var(--ink);
  background: #f6fff6;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 23px;
  line-height: 1.25;
}

.card p,
.card li {
  color: #3d463f;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 14px 0 0;
  list-style: none;
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

.tag-list li {
  padding: 5px 9px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 13px;
}

.warning {
  border-left: 5px solid var(--clay);
  background: #fff8f4;
}

.ok {
  border-left: 5px solid var(--green);
}

.compare {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: #fff;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 740px;
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

th,
td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  background: #edf7ed;
}

.faq-list {
  display: grid;
  gap: 14px;
}

details {
  border: 1px solid var(--line);
  background: #fff;
  padding: 16px 18px;
}

summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 18px;
}

footer {
  margin-top: 40px;
  padding: 34px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
}

@media (max-width: 820px) {
  .shell {
    width: min(100% - 28px, 1160px);
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero {
    padding-top: 44px;
  }

  .hero-grid,
  .cards {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: clamp(38px, 15vw, 68px);
  }

  .lead {
    font-size: 18px;
  }
}