:root {
  --bg: #edf2f7;
  --bg-soft: #f7f9fc;
  --panel: #ffffff;
  --panel-2: #f9fbfd;
  --text: #142033;
  --muted: #667588;
  --line: #dbe3ec;
  --line-strong: #c7d3df;
  --accent: #274766;
  --accent-2: #335f87;
  --accent-soft: #eaf2f8;
  --shadow: 0 18px 40px rgba(17, 29, 45, 0.08);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(39, 71, 102, 0.08), transparent 28%),
    linear-gradient(180deg, #f8fbfe 0%, #f3f6fa 220px, var(--bg) 220px, var(--bg) 100%);
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input { font: inherit; }
code, pre { font-family: Consolas, Monaco, monospace; }
.wrap { width: min(1240px, calc(100% - 32px)); margin: 0 auto; }
.is-hidden { display: none !important; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(12px);
  background: rgba(248, 251, 254, 0.88);
  border-bottom: 1px solid rgba(219, 227, 236, 0.9);
}

.topbar {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand span:last-child {
  display: grid;
  gap: 4px;
}

.brand strong { font-size: 1rem; }
.brand small { color: var(--muted); }

.brand__mark {
  width: 44px;
  height: 44px;
  display: inline-grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-weight: 700;
  box-shadow: var(--shadow);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-link,
.button,
.filter-pill,
.task-card,
.detail-link {
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.nav-link {
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  padding: 10px 14px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 700;
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--text);
  background: #fff;
  border-color: var(--line);
}

.hero-section,
.overview-section,
.workspace-section {
  padding: 36px 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.9fr;
  gap: 22px;
}

.hero-card,
.hero-side,
.overview-card,
.workspace-panel,
.task-card,
.detail-shell,
.footer-box,
.workspace-empty,
.detail-card,
.detail-hero,
.note-block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.hero-card { padding: 36px; }
.hero-side {
  padding: 18px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.eyebrow,
.workspace-label,
.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 700;
}

.eyebrow {
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero-card h1 {
  margin: 0 0 14px;
  font-size: clamp(2.2rem, 4vw, 3.6rem);
  line-height: 1.03;
}

.hero-text,
.section-head p,
.overview-card p,
.workspace-empty p,
.task-card p,
.detail-intro,
.detail-subtitle,
.notes-intro,
.note-text,
.footer-box p,
.muted,
.detail-card li {
  color: var(--muted);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 12px 18px;
  cursor: pointer;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

.button:hover {
  transform: translateY(-1px);
  background: var(--accent-2);
}

.button--ghost {
  background: #fff;
  color: var(--accent);
  border-color: var(--line);
}

.button--ghost:hover { background: var(--panel-2); }
.button--small { padding: 10px 14px; }

.info-box {
  padding: 18px;
  border-radius: 18px;
  background: linear-gradient(180deg, #fcfdff, #f2f6fa);
  border: 1px solid #e1e8f0;
}

.info-box strong {
  display: block;
  margin-bottom: 6px;
  font-size: 1.85rem;
}

.info-box span { color: var(--muted); }

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 18px;
  margin-bottom: 18px;
}

.section-head--center {
  justify-content: center;
  text-align: center;
}

.section-head h2,
.overview-card h3,
.workspace-empty h3,
.task-card h3,
.detail-card h3,
.note-block h4,
.detail-hero h2 {
  margin: 0 0 8px;
}

.section-head h2 { font-size: 2rem; }

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

.overview-card { padding: 26px; }

.workspace-panel {
  padding: 18px;
}

.toolbar {
  display: grid;
  gap: 16px;
  margin-bottom: 18px;
}

.search {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 56px;
  padding: 0 16px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.search input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
}

.search input:disabled { cursor: not-allowed; }

.category-row {
  display: grid;
  gap: 10px;
}

.category-label {
  font-weight: 700;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.filter-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 14px;
  background: #fff;
  cursor: pointer;
  color: var(--muted);
  font-weight: 700;
}

.filter-pill:hover,
.filter-pill.is-active {
  border-color: rgba(39, 71, 102, 0.2);
  background: var(--accent-soft);
  color: var(--accent);
}

.filter-pill.is-muted {
  cursor: default;
  opacity: 0.72;
}

.workspace-empty {
  padding: 34px;
  text-align: center;
}

.workspace-layout {
  display: none;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 18px;
}

.workspace-panel.is-active .workspace-layout {
  display: grid;
}

.workspace-panel.is-active .workspace-empty {
  display: none;
}

.list-shell {
  min-height: 620px;
}

.list-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.task-list {
  display: grid;
  gap: 12px;
  max-height: 860px;
  overflow: auto;
  padding-right: 6px;
}

.task-card {
  width: 100%;
  text-align: left;
  padding: 16px;
  cursor: pointer;
  background: var(--panel);
}

.task-card:hover {
  transform: translateY(-1px);
  border-color: var(--line-strong);
}

.task-card.is-active {
  border-color: rgba(39, 71, 102, 0.25);
  background: linear-gradient(180deg, #ffffff, #f5f9fd);
}

.task-card__meta,
.detail-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.chip {
  min-height: 30px;
  padding: 6px 10px;
  background: #f5f8fb;
  border: 1px solid var(--line);
  color: var(--accent);
  font-size: 0.84rem;
}

.detail-shell {
  min-height: 620px;
  padding: 18px;
}

.placeholder-card {
  padding: 28px;
  border-radius: var(--radius-md);
  border: 1px dashed var(--line-strong);
  background: var(--panel-2);
}

.detail-hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 18px;
  padding: 22px;
  margin-bottom: 18px;
}

.detail-image {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: #f4f8fb;
}

.detail-actions,
.detail-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.detail-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 14px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--line);
  font-weight: 700;
}

.detail-link:hover {
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.facts-grid,
.detail-grid {
  display: grid;
  gap: 16px;
}

.facts-grid {
  grid-template-columns: repeat(4, 1fr);
  margin-top: 18px;
}

.fact-box {
  padding: 16px;
  border-radius: 18px;
  background: linear-gradient(180deg, #fcfdff, #f2f6fa);
  border: 1px solid var(--line);
}

.fact-box strong {
  display: block;
  margin-bottom: 4px;
  font-size: 1.3rem;
}

.fact-box span { color: var(--muted); }

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

.detail-card,
.note-block {
  padding: 22px;
}

.detail-card--full { grid-column: 1 / -1; }

.detail-card ul,
.detail-card ol,
.note-block ul {
  margin: 0;
  padding-left: 22px;
}

.notes-panel {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-2);
  overflow: hidden;
}

.notes-panel summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  padding: 18px 20px;
  font-weight: 700;
}

.notes-panel summary::-webkit-details-marker { display: none; }
.notes-panel__hint { color: var(--muted); font-weight: 400; }
.notes-panel__content { padding: 0 20px 20px; }
.notes-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.note-code,
pre {
  margin: 0;
  padding: 16px;
  border-radius: 16px;
  background: #111a27;
  color: #ecf2f8;
  overflow: auto;
}

.workspace-label {
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(39, 71, 102, 0.08);
}

.footer-box {
  margin-bottom: 30px;
  padding: 22px;
}

@media (max-width: 1060px) {
  .hero-grid,
  .detail-hero,
  .workspace-panel.is-active .workspace-layout,
  .overview-grid,
  .notes-grid,
  .detail-grid {
    grid-template-columns: 1fr;
  }

  .hero-side,
  .facts-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .list-shell,
  .detail-shell {
    min-height: auto;
  }

  .task-list {
    max-height: none;
  }
}

@media (max-width: 760px) {
  .topbar,
  .section-head,
  .workspace-head {
    align-items: start;
    flex-direction: column;
  }

  .main-nav {
    width: 100%;
    flex-wrap: wrap;
  }

  .nav-link {
    flex: 1 1 calc(33.333% - 8px);
  }

  .hero-card,
  .overview-card,
  .workspace-empty,
  .detail-shell,
  .detail-card,
  .note-block {
    padding: 18px;
  }

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

  .wrap { width: min(100% - 20px, 1240px); }
}