:root {
  --bg: #f6f2e9;
  --surface: rgba(255, 253, 248, 0.92);
  --surface-soft: rgba(255, 255, 255, 0.72);
  --line: rgba(31, 53, 81, 0.14);
  --line-strong: rgba(31, 53, 81, 0.26);
  --text: #1d2a36;
  --muted: #667284;
  --accent: #2a5d92;
  --accent-deep: #1d456b;
  --shadow: 0 14px 34px rgba(31, 53, 81, 0.06);
  --radius: 8px;
  --radius-lg: 12px;
  --max: 1040px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Noto Serif SC", "Songti SC", "PingFang SC", "Microsoft YaHei", serif;
  background:
    radial-gradient(circle at top left, rgba(42, 93, 146, 0.08), transparent 26%),
    linear-gradient(180deg, #fdfbf7 0%, var(--bg) 50%, #f8f4ec 100%);
}

a {
  color: inherit;
}

button {
  font: inherit;
}

.page-shell {
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(31, 53, 81, 0.08);
  background: rgba(253, 251, 247, 0.88);
  backdrop-filter: blur(14px);
}

.site-header__inner,
.layout {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
}

.site-header__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  padding: 22px 0 18px;
}

.site-header h1,
.intro h2,
.section-heading h2,
.archive-year__title,
.resource-card__title {
  margin: 0;
  line-height: 1.2;
}

.site-header h1 {
  font-size: clamp(1.4rem, 2vw, 1.82rem);
}

.site-header__note,
.intro__lede,
.section-note,
.archive-year__count,
.resource-card__summary,
.resource-card__detail,
.resource-card__date,
.archive-empty {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.site-header__note {
  margin-top: 8px;
  font-size: 0.96rem;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-deep);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.year-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.year-nav__link,
.intro__action,
.resource-card__toggle,
.resource-card__action,
.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-soft);
  text-decoration: none;
  transition: 160ms ease;
}

.year-nav__link,
.resource-card__toggle,
.chip {
  color: var(--accent-deep);
}

.intro__action,
.resource-card__action--primary {
  color: #fdfbf7;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
  border-color: rgba(29, 69, 107, 0.4);
}

.resource-card__action {
  color: var(--text);
}

.year-nav__link:hover,
.year-nav__link:focus-visible,
.intro__action:hover,
.intro__action:focus-visible,
.resource-card__toggle:hover,
.resource-card__toggle:focus-visible,
.resource-card__action:hover,
.resource-card__action:focus-visible {
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.layout {
  padding: 34px 0 64px;
}

.intro {
  max-width: 760px;
  padding: 10px 0 18px;
}

.intro h2,
.section-heading h2 {
  font-size: clamp(1.6rem, 2.6vw, 2.2rem);
}

.intro__lede {
  margin-top: 16px;
  font-size: 1.02rem;
}

.intro__action {
  margin-top: 22px;
}

.archive-section {
  margin-top: 26px;
}

.section-heading {
  display: grid;
  gap: 6px;
  margin-bottom: 22px;
  padding-top: 12px;
  border-top: 1px solid rgba(31, 53, 81, 0.1);
}

.archive-container {
  display: grid;
  gap: 30px;
}

.archive-year {
  display: grid;
  gap: 14px;
}

.archive-year__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.archive-year__title {
  font-size: 1.48rem;
}

.archive-year__list {
  display: grid;
  gap: 14px;
}

.resource-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 22px 24px;
}

.resource-card:hover,
.resource-card.is-expanded {
  border-color: var(--line-strong);
}

.resource-card__trigger {
  width: 100%;
  display: grid;
  gap: 14px;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.resource-card__trigger:focus-visible {
  outline: 2px solid rgba(42, 93, 146, 0.28);
  outline-offset: 6px;
  border-radius: var(--radius);
}

.resource-card__head,
.resource-card__footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.resource-card__title {
  font-size: 1.58rem;
  font-weight: 700;
}

.resource-card__summary {
  font-size: 1.02rem;
}

.resource-card__date {
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}

.resource-card__body {
  display: none;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(31, 53, 81, 0.1);
}

.resource-card.is-expanded .resource-card__body {
  display: block;
}

.resource-card__detail {
  font-size: 0.98rem;
}

.resource-card__footer {
  margin-top: 18px;
}

.chip-row,
.resource-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  background: rgba(42, 93, 146, 0.08);
}

.archive-empty {
  padding: 24px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.45);
}

@media (max-width: 860px) {
  .site-header__inner,
  .archive-year__header,
  .resource-card__head,
  .resource-card__footer {
    display: grid;
  }

  .year-nav,
  .resource-card__actions {
    justify-content: flex-start;
  }

  .resource-card__toggle {
    justify-self: start;
  }
}

@media (max-width: 560px) {
  .site-header__inner,
  .layout {
    width: min(calc(100% - 20px), var(--max));
  }

  .layout {
    padding-top: 24px;
  }

  .resource-card {
    padding: 18px 16px;
  }

  .resource-card__title {
    font-size: 1.24rem;
  }

  .intro h2,
  .section-heading h2,
  .archive-year__title {
    font-size: 1.36rem;
  }
}