:root {
  color-scheme: light;
  --green: #2ba245;
  --green-strong: #2e7d32;
  --green-soft: #e8f5e9;
  --green-muted: #81c784;
  --bg: #f5f9f5;
  --surface: #fff;
  --line: #c8e6c9;
  --text: #1a1f1a;
  --muted: #6b756b;
  --danger: #b42318;
  --content: 1180px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { min-width: 320px; background: var(--bg); }
body { margin: 0; color: var(--text); background: var(--bg); }
button, input { font: inherit; }
button { color: inherit; }
a { color: var(--green-strong); }
img { max-width: 100%; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 72px;
  background: rgba(255, 255, 255, .98);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  width: min(var(--content), calc(100% - 32px));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand,
.desktop-nav button,
.mobile-nav button,
.text-button {
  border: 0;
  background: none;
  cursor: pointer;
}

.brand { padding: 0; font-size: 22px; font-weight: 700; }
.desktop-nav { display: flex; align-items: stretch; height: 100%; gap: 28px; }
.desktop-nav button { position: relative; padding: 0 2px; }
.desktop-nav button.is-active { color: var(--green); font-weight: 700; }
.desktop-nav button.is-active::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: var(--green);
  content: "";
}
.desktop-nav span { align-self: center; color: var(--muted); font-size: 13px; }

#app {
  width: min(var(--content), calc(100% - 32px));
  min-height: calc(100vh - 144px);
  margin: 0 auto;
  padding: 32px 0 72px;
  outline: none;
}

.page-state {
  min-height: 320px;
  display: grid;
  place-items: center;
  color: var(--muted);
  text-align: center;
}
.page-state.is-error { color: var(--danger); }
.page-state button { margin-top: 14px; }

.intro {
  min-height: 76px;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-left: 4px solid var(--green);
  border-radius: 10px;
  background: var(--green-soft);
}
.intro h1 { margin: 0; color: var(--green-strong); font-size: 24px; }
.intro p { margin: 0; color: var(--green); }

.section { margin-top: 32px; }
.section-heading {
  margin: 0 0 16px;
  padding-bottom: 10px;
  color: var(--green-strong);
  border-bottom: 1px solid var(--line);
  font-size: 20px;
}

.category-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px 20px; }
.category-card,
.update-card,
.document-card,
.software-card {
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
}
.category-card {
  min-height: 102px;
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 18px;
  cursor: pointer;
  text-align: left;
}
.category-card:hover,
.update-card:hover,
.document-card:hover { border-color: var(--green); }
.category-card img { width: 48px; height: 48px; object-fit: contain; flex: 0 0 48px; }
.category-card strong { display: block; color: var(--green-strong); font-size: 18px; }
.category-card small { display: block; margin-top: 5px; color: var(--green-muted); font-size: 14px; }

.update-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 20px; }
.update-card {
  width: 100%;
  min-height: 58px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  text-align: left;
}
.update-card img { width: 22px; height: 22px; flex: 0 0 22px; }
.update-card span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.page-title { margin: 0; color: var(--green-strong); font-size: 28px; }
.breadcrumb { margin: 8px 0 18px; color: var(--muted); font-size: 14px; }
.toolbar { display: flex; gap: 12px; margin-bottom: 24px; }
.search-input {
  min-width: 0;
  height: 52px;
  padding: 0 20px;
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  outline: none;
}
.search-input:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(43, 162, 69, .12); }
.primary-button,
.secondary-button {
  min-height: 42px;
  padding: 0 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 7px;
  cursor: pointer;
  text-decoration: none;
}
.primary-button { border: 1px solid var(--green); color: #fff; background: var(--green); }
.secondary-button { border: 1px solid var(--line); color: var(--text); background: var(--surface); }

.brand-groups { display: grid; gap: 18px; }
.brand-group { padding: 18px 20px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface); }
.brand-group h2 { margin: 0 0 12px; color: var(--green-strong); font-size: 18px; }
.brand-list { display: flex; flex-wrap: wrap; gap: 10px; }
.brand-button { padding: 9px 14px; border: 1px solid var(--line); border-radius: 20px; background: #fff; cursor: pointer; }
.brand-button:hover { border-color: var(--green); color: var(--green-strong); }

.browser-layout { display: grid; grid-template-columns: 274px minmax(0, 1fr); gap: 20px; }
.side-panel,
.content-panel { border: 1px solid var(--line); border-radius: 9px; background: var(--surface); }
.side-panel { padding: 16px 8px; }
.side-panel h2 { margin: 4px 16px 14px; color: var(--green-strong); font-size: 18px; }
.side-button { width: 100%; padding: 12px 16px; border: 0; border-radius: 7px; background: none; cursor: pointer; text-align: left; }
.side-button.is-active { color: var(--green); background: var(--green-soft); font-weight: 700; }
.content-panel { min-height: 520px; padding: 22px 26px; }
.content-panel-header { margin-bottom: 10px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.content-panel-header h2 { margin: 0; color: var(--green-strong); font-size: 21px; }

.document-list { display: grid; }
.document-card {
  margin-top: -1px;
  padding: 18px 4px;
  border-width: 1px 0;
  border-radius: 0;
  cursor: pointer;
  text-align: left;
}
.document-card strong { display: block; font-weight: 500; line-height: 1.55; }
.document-card small { display: block; margin-top: 5px; color: var(--green-muted); }

.tree-panel { padding: 24px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface); }
.tree-panel details { margin-left: 16px; }
.tree-panel > details { margin-left: 0; }
.tree-panel summary { padding: 10px 6px; color: var(--green-strong); cursor: pointer; font-weight: 700; }
.tree-leaf {
  width: calc(100% - 18px);
  margin: 0 0 0 18px;
  padding: 11px 14px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  border: 0;
  border-left: 3px solid var(--green);
  background: #fff;
  cursor: pointer;
  text-align: left;
}
.tree-leaf:hover { background: var(--green-soft); }
.tree-leaf span:last-child { color: var(--green); flex: 0 0 auto; }

.viewer-shell { width: 100vw; margin-left: calc(50% - 50vw); margin-top: -32px; }
.viewer-toolbar {
  min-height: 78px;
  padding: 14px max(24px, calc((100vw - var(--content)) / 2));
  display: flex;
  align-items: center;
  gap: 12px;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.viewer-title { min-width: 0; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 700; }
.viewer-badge { padding: 8px 14px; border-radius: 18px; color: var(--green-strong); background: var(--green-soft); font-weight: 700; }
.viewer-stage { padding: 24px max(12px, calc((100vw - var(--content)) / 2)); }
.viewer-frame { width: 100%; height: calc(100vh - 220px); min-height: 560px; border: 1px solid #d6ddd6; border-radius: 5px; background: #fff; box-shadow: 0 2px 8px rgba(0, 0, 0, .08); }

.software-categories { display: grid; gap: 14px; }
.software-category { padding: 18px 20px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.software-category h2 { margin: 0 0 12px; color: var(--green-strong); font-size: 18px; }
.software-card { padding: 20px; }
.software-card + .software-card { margin-top: 16px; }
.software-card h2 { margin: 0 0 10px; font-size: 19px; }
.software-card p { color: var(--muted); line-height: 1.7; }
.software-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.password { padding: 8px 12px; border-radius: 6px; background: var(--green-soft); }

.empty { padding: 72px 20px; color: var(--muted); text-align: center; }
.site-footer { margin-top: 52px; padding-top: 24px; display: flex; justify-content: space-between; color: var(--muted); border-top: 1px solid var(--line); font-size: 13px; }
.mobile-nav { display: none; }

@media (max-width: 820px) {
  .site-header { height: 64px; }
  .header-inner { justify-content: center; }
  .brand { font-size: 20px; }
  .desktop-nav { display: none; }
  #app { width: calc(100% - 28px); min-height: calc(100vh - 130px); padding: 16px 0 88px; }
  .intro { min-height: 70px; padding: 16px; display: block; }
  .intro h1 { font-size: 20px; }
  .intro p { margin-top: 6px; font-size: 13px; }
  .section { margin-top: 24px; }
  .section-heading { font-size: 18px; }
  .category-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .category-card { min-height: 118px; padding: 14px 10px; gap: 10px; align-items: flex-start; }
  .category-card img { width: 40px; height: 40px; flex-basis: 40px; }
  .category-card strong { font-size: 16px; line-height: 1.4; }
  .category-card small { font-size: 13px; }
  .update-grid { grid-template-columns: 1fr; gap: 10px; }
  .page-title { font-size: 22px; }
  .toolbar { gap: 8px; }
  .search-input { height: 46px; padding: 0 14px; font-size: 15px; }
  .primary-button { padding: 0 18px; }
  .browser-layout { display: block; }
  .side-panel { margin-bottom: 14px; padding: 8px; display: flex; gap: 6px; overflow-x: auto; }
  .side-panel h2 { display: none; }
  .side-button { width: auto; flex: 0 0 auto; padding: 9px 14px; border-radius: 18px; }
  .content-panel { min-height: 460px; padding: 18px 14px; }
  .content-panel-header { display: block; }
  .content-panel-header small { display: block; margin-top: 6px; }
  .tree-panel { padding: 12px 6px; }
  .tree-panel details { margin-left: 8px; }
  .tree-leaf { width: calc(100% - 10px); margin-left: 10px; padding: 11px 10px; }
  .viewer-shell { margin-top: -16px; }
  .viewer-toolbar { padding: 10px 14px; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; }
  .viewer-title { grid-column: 1 / -1; grid-row: 2; font-size: 14px; }
  .viewer-toolbar .secondary-button { display: none; }
  .viewer-badge { padding: 7px 11px; font-size: 13px; }
  .viewer-stage { padding: 12px 8px; overflow: auto; touch-action: pan-x pan-y pinch-zoom; }
  .viewer-frame { height: calc(100vh - 220px); min-height: 520px; touch-action: pan-x pan-y pinch-zoom; }
  .site-footer { margin-bottom: 24px; }
  .mobile-nav {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 30;
    height: calc(66px + env(safe-area-inset-bottom));
    padding-bottom: env(safe-area-inset-bottom);
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    background: rgba(255, 255, 255, .98);
    border-top: 1px solid var(--line);
  }
  .mobile-nav button { display: grid; place-items: center; align-content: center; gap: 2px; color: var(--muted); }
  .mobile-nav button.is-active { color: var(--green); font-weight: 700; }
  .mobile-nav img { width: 27px; height: 27px; object-fit: contain; }
  .mobile-nav span { font-size: 13px; }
  body.viewer-open .site-header,
  body.viewer-open .mobile-nav { display: none; }
  body.viewer-open #app { width: 100%; padding-top: 0; padding-bottom: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}