:root {
  color-scheme: light;
  --ink: #101820;
  --muted: #5d6875;
  --line: #d9e1e8;
  --paper: #f7f9fb;
  --white: #ffffff;
  --teal: #11a7a5;
  --teal-deep: #08706f;
  --gold: #d8a84b;
  --red: #b7463b;
  --navy: #13243a;
  --shadow: 0 18px 48px rgba(16, 24, 32, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

.site-header {
  min-height: 92vh;
  color: var(--white);
  background:
    linear-gradient(115deg, rgba(19, 36, 58, 0.94), rgba(8, 112, 111, 0.86)),
    url("./assets/banners/rollup-1.jpg") center 36% / cover;
}

.topbar {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 110px;
}

.brand img {
  width: 112px;
  height: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a {
  padding: 10px 12px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 14px;
}

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

.hero {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 68px 0 64px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(330px, 430px);
  align-items: center;
  gap: 58px;
}

.hero-copy {
  max-width: 760px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 820px;
  font-size: clamp(44px, 7vw, 84px);
  line-height: 1.04;
  letter-spacing: 0;
}

.hero p:not(.eyebrow) {
  margin: 22px 0 0;
  max-width: 680px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 20px;
  line-height: 1.8;
}

.hero-actions,
.viewer-actions {
  margin-top: 30px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  min-height: 44px;
  padding: 12px 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 800;
  font-size: 14px;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: var(--teal);
  color: var(--white);
  box-shadow: 0 12px 28px rgba(17, 167, 165, 0.28);
}

.button.secondary {
  border-color: rgba(255, 255, 255, 0.35);
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
}

.resource-card .button.secondary,
.viewer-actions .button.secondary {
  border-color: var(--line);
  color: var(--ink);
  background: var(--white);
}

.hero-media {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  padding: 14px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.26);
}

.hero-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  border-radius: 6px;
}

main {
  width: min(1180px, calc(100% - 40px));
  margin: -52px auto 80px;
}

.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
  box-shadow: var(--shadow);
}

.stats-strip div {
  min-height: 112px;
  padding: 24px;
  background: var(--white);
}

.stats-strip strong {
  display: block;
  color: var(--teal-deep);
  font-size: 38px;
  line-height: 1;
}

.stats-strip span {
  display: block;
  margin-top: 10px;
  color: var(--muted);
}

.toolbar,
.section-heading,
.download-band {
  margin-top: 56px;
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1fr);
  gap: 30px;
  align-items: end;
}

h2 {
  margin: 0;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.15;
}

.controls {
  display: grid;
  gap: 14px;
}

.search {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}

.search input {
  width: 100%;
  min-height: 46px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  color: var(--ink);
  outline: none;
}

.search input:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(17, 167, 165, 0.14);
}

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

.filter {
  min-height: 38px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  color: var(--muted);
  cursor: pointer;
}

.filter.active {
  color: var(--white);
  background: var(--navy);
  border-color: var(--navy);
}

.category-section {
  margin-top: 54px;
}

.resource-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.resource-card {
  min-height: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  overflow: hidden;
  box-shadow: 0 10px 24px rgba(16, 24, 32, 0.06);
  display: flex;
  flex-direction: column;
}

.thumb {
  height: 210px;
  background: #e7edf2;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.thumb img,
.thumb video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.doc-thumb {
  width: 100%;
  height: 100%;
  padding: 26px;
  color: var(--white);
  background: linear-gradient(135deg, var(--navy), var(--teal-deep));
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.doc-thumb strong {
  font-size: 44px;
  line-height: 1;
}

.doc-thumb span {
  font-size: 17px;
  font-weight: 800;
  line-height: 1.35;
}

.archive-thumb {
  background: linear-gradient(135deg, #fbf3dd, #ffffff);
  color: var(--red);
}

.card-body {
  padding: 18px;
  display: flex;
  flex: 1;
  flex-direction: column;
}

.meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 12px;
}

.tag {
  padding: 5px 8px;
  border-radius: 5px;
  background: #edf6f6;
  color: var(--teal-deep);
  font-weight: 800;
}

.resource-card h3 {
  margin: 14px 0 8px;
  font-size: 19px;
  line-height: 1.35;
}

.resource-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.card-actions {
  margin-top: auto;
  padding-top: 18px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.card-actions .button {
  min-height: 40px;
  padding: 9px 13px;
}

.download-band {
  padding: 30px;
  border-radius: 8px;
  background: var(--navy);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
}

.download-band p:not(.section-kicker) {
  max-width: 720px;
  margin: 12px 0 0;
  color: rgba(255, 255, 255, 0.76);
  line-height: 1.75;
}

.viewer {
  width: min(1120px, calc(100% - 30px));
  max-height: 90vh;
  padding: 0;
  border: 0;
  border-radius: 8px;
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.36);
}

.viewer::backdrop {
  background: rgba(5, 12, 20, 0.72);
}

.viewer-shell {
  background: var(--white);
}

.viewer-top {
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.viewer-top p,
.viewer-top h3 {
  margin: 0;
}

.viewer-top p {
  color: var(--teal-deep);
  font-size: 12px;
  font-weight: 800;
}

.viewer-top h3 {
  margin-top: 4px;
  font-size: 22px;
}

.icon-button {
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  color: var(--ink);
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
}

.viewer-body {
  height: min(68vh, 720px);
  background: #0e1824;
  display: grid;
  place-items: center;
}

.viewer-body iframe,
.viewer-body video,
.viewer-body img {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

.viewer-body img,
.viewer-body video {
  object-fit: contain;
}

.viewer-actions {
  margin: 0;
  padding: 16px 20px 20px;
  justify-content: flex-end;
}

.hidden {
  display: none;
}

@media (max-width: 900px) {
  .site-header {
    min-height: auto;
  }

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

  .hero {
    padding-top: 46px;
    gap: 34px;
  }

  .stats-strip,
  .resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .download-band {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 620px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .hero h1 {
    font-size: 42px;
  }

  .hero p:not(.eyebrow) {
    font-size: 17px;
  }

  main {
    width: min(100% - 28px, 1180px);
  }

  .stats-strip,
  .resource-grid {
    grid-template-columns: 1fr;
  }

  .stats-strip div {
    min-height: 92px;
  }

  .thumb {
    height: 240px;
  }

  .viewer {
    width: calc(100% - 18px);
  }

  .viewer-body {
    height: 60vh;
  }
}