:root {
  --ink: #1c232b;
  --muted: #5f6c78;
  --paper: #fbfaf6;
  --surface: #ffffff;
  --line: #dfe5e9;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --warm: #c2410c;
  --soft: #eef7f4;
  --shadow: 0 18px 40px rgba(28, 35, 43, 0.08);
  font-family: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
}

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

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

a:hover {
  text-decoration: underline;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  padding: 8px 12px;
  background: var(--ink);
  color: #fff;
  z-index: 20;
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(251, 250, 246, 0.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 900;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--ink);
  font-size: 15px;
}

.nav-links a[aria-current="page"] {
  color: var(--accent-strong);
  font-weight: 700;
}

.hero {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0 36px;
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(320px, 0.97fr);
  gap: 40px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--warm);
  font-size: 14px;
  font-weight: 800;
}

h1,
h2,
h3 {
  line-height: 1.2;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(36px, 6vw, 68px);
}

h2 {
  margin: 0 0 16px;
  font-size: clamp(27px, 3.4vw, 42px);
}

h3 {
  margin: 0 0 8px;
  font-size: 22px;
}

p {
  margin: 0 0 16px;
}

.lead {
  margin-top: 20px;
  max-width: 650px;
  color: var(--muted);
  font-size: 19px;
}

.hero-actions,
.article-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  padding: 10px 16px;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
}

.button:hover {
  background: var(--accent-strong);
  text-decoration: none;
}

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

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

.hero-media {
  min-height: 390px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
  background: #dbeafe;
}

.illustration {
  width: 100%;
  height: 100%;
}

.section {
  padding: 54px 0;
}

.section.alt {
  background: #f3f7f5;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.section-header {
  max-width: 760px;
  margin-bottom: 28px;
}

.section-header p {
  color: var(--muted);
  font-size: 18px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card,
.note,
.contact-panel,
.article-card {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 8px;
  box-shadow: 0 8px 22px rgba(28, 35, 43, 0.05);
}

.card {
  padding: 22px;
}

.card p,
.article-card p,
.note p,
.muted {
  color: var(--muted);
}

.kicker {
  color: var(--warm);
  font-size: 13px;
  font-weight: 800;
}

.article-list {
  display: grid;
  gap: 18px;
}

.article-card {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 18px;
  padding: 16px;
  align-items: center;
}

.article-thumb {
  min-height: 132px;
  border-radius: 8px;
  background: var(--soft);
  overflow: hidden;
}

.article-card h3 a {
  color: var(--ink);
}

.meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 14px;
  margin: 6px 0 10px;
}

.page-title {
  width: min(900px, calc(100% - 32px));
  margin: 0 auto;
  padding: 54px 0 28px;
}

.page-title h1 {
  font-size: clamp(34px, 5vw, 56px);
}

.content {
  width: min(820px, calc(100% - 32px));
  margin: 0 auto 64px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(22px, 4vw, 42px);
  box-shadow: var(--shadow);
}

.content h2 {
  margin-top: 34px;
  font-size: 28px;
}

.content h3 {
  margin-top: 24px;
  font-size: 21px;
}

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

.content li {
  margin-bottom: 8px;
}

.toc {
  padding: 18px;
  margin: 26px 0;
  background: #f6faf8;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.toc strong {
  display: block;
  margin-bottom: 8px;
}

.note {
  padding: 20px;
  margin-top: 24px;
}

.contact-panel {
  padding: 26px;
  display: grid;
  gap: 18px;
}

.contact-row {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 12px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.footer {
  padding: 36px 0;
  background: var(--ink);
  color: #e9eef2;
}

.footer a {
  color: #d6f2ec;
}

.footer-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: start;
}

.footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.footer p {
  margin: 8px 0 0;
  color: #b8c3cc;
}

.article-hero {
  width: 100%;
  min-height: 240px;
  margin: 6px 0 28px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--soft);
}

.checklist {
  display: grid;
  gap: 12px;
  padding-left: 0;
  list-style: none;
}

.checklist li {
  padding: 12px 14px;
  background: #f6faf8;
  border-left: 4px solid var(--accent);
  border-radius: 6px;
}

@media (max-width: 860px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
    gap: 10px;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 36px;
  }

  .hero-media {
    min-height: 290px;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .article-card {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .contact-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .nav-links {
    gap: 10px 14px;
  }

  .hero,
  .container,
  .page-title,
  .content,
  .footer-inner {
    width: min(100% - 24px, 1120px);
  }

  .content {
    padding: 18px;
  }
}