/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg: #f8f9fb;
  --color-surface: #ffffff;
  --color-surface-raised: #f1f3f5;
  --color-surface-hover: #e9ecef;
  --color-border: #dee2e6;
  --color-border-hover: #ced4da;
  --color-text: #1a1a2e;
  --color-text-secondary: #495057;
  --color-text-muted: #868e96;
  --color-primary: #1a1a2e;
  --color-primary-subtle: rgba(57, 105, 202, 0.08);
  --color-accent: #3969CA;
  --color-accent-dim: rgba(57, 105, 202, 0.10);
  --color-success: #21C19A;
  --color-success-dim: rgba(33, 193, 154, 0.12);
  --color-warning: #e67e22;
  --color-warning-dim: rgba(230, 126, 34, 0.12);
  --color-danger: #e74c3c;
  --color-danger-dim: rgba(231, 76, 60, 0.12);
  --color-info: #0294DE;
  --color-info-dim: rgba(2, 148, 222, 0.12);
  --color-purple: #3969CA;
  --color-purple-dim: rgba(57, 105, 202, 0.10);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ===== Sticky Top Wrapper ===== */
.sticky-top {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
}

/* ===== Under-Construction Banner ===== */
.under-construction-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  background: var(--color-warning-dim);
  border-bottom: 1px solid var(--color-warning);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text);
  text-align: center;
}

.under-construction-icon {
  font-size: 1rem;
  line-height: 1;
}

.site-header {
  background: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  padding: 1rem 0;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.site-logo { width: 28px; height: 28px; }
.site-logo-img { height: 28px; width: auto; }

.site-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.site-divider {
  width: 1px;
  height: 20px;
  background: var(--color-border);
}

.site-subtitle {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

.toolbar {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem 2rem 0.75rem;
}

.search-bar {
  position: relative;
  margin-bottom: 0.75rem;
}

.search-bar input {
  width: 100%;
  padding: 0.65rem 1rem 0.65rem 2.4rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color 0.15s, box-shadow 0.15s;
  font-family: var(--font-sans);
}

.search-bar input::placeholder { color: var(--color-text-muted); }

.search-bar input:focus {
  outline: none;
  border-color: var(--color-border-hover);
  box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

.search-bar .search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  pointer-events: none;
}

.filter-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.filter-group label {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.filter-group select {
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  background: var(--color-surface);
  color: var(--color-text-secondary);
  cursor: pointer;
  font-family: var(--font-sans);
}

.filter-group select:focus {
  outline: none;
  border-color: var(--color-border-hover);
}

.active-filters {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.18rem 0.5rem;
  background: var(--color-accent-dim);
  color: var(--color-accent);
  border-radius: 99px;
  font-size: 0.7rem;
  font-weight: 600;
}

.filter-chip button {
  background: none;
  border: none;
  color: var(--color-accent);
  cursor: pointer;
  font-size: 0.85rem;
  line-height: 1;
  padding: 0;
  opacity: 0.7;
}
.filter-chip button:hover { opacity: 1; }

.clear-all-btn {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 0.7rem;
  cursor: pointer;
  text-decoration: underline;
  padding: 0.18rem 0.4rem;
}

.results-summary {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.35rem;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.tag-btn {
  padding: 0.12rem 0.45rem;
  border: 1px solid var(--color-border);
  border-radius: 99px;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.68rem;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font-sans);
}

.tag-btn:hover, .tag-btn.active {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ===== Document Layout ===== */
.content-area {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 2rem 4rem;
}

.doc-intro {
  padding: 1.75rem 0 1rem;
  border-bottom: 1px solid var(--color-border);
}

.doc-intro h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.doc-intro p {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  max-width: 68ch;
}

/* Sections */
.doc-section {
  margin-top: 2.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  scroll-margin-top: calc(var(--sticky-header-h, 5rem) + 1.5rem);
}

.doc-section-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--color-text);
  padding: 0.85rem 1.5rem;
  background: var(--color-surface-raised);
  border-bottom: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
}

.doc-section-count {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-accent);
  background: var(--color-accent-dim);
  padding: 0.1rem 0.5rem;
  border-radius: 99px;
}

.doc-entries {
  display: flex;
  flex-direction: column;
  padding: 0 1.5rem;
}

/* Entries */
.doc-entry {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.doc-entry:last-child { border-bottom: none; }

.entry-title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.3rem;
}

.entry-title a {
  color: var(--color-text);
  text-decoration: none;
}

.entry-title a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.entry-depth { display: inline-flex; gap: 0.25rem; }

.depth-badge {
  font-size: 0.6rem;
  font-weight: 600;
  color: var(--color-info);
  background: var(--color-info-dim);
  padding: 0.06rem 0.4rem;
  border-radius: 99px;
}

.entry-draft {
  font-size: 0.55rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-warning);
  background: var(--color-warning-dim);
  padding: 0.08rem 0.4rem;
  border-radius: 99px;
}

.entry-tier {
  font-size: 0.55rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.08rem 0.4rem;
  border-radius: 99px;
}
.entry-tier.tier-internal { color: var(--color-danger); background: var(--color-danger-dim); }
.entry-tier.tier-partner { color: var(--color-accent); background: var(--color-accent-dim); }
.entry-tier.tier-public { color: var(--color-success); background: var(--color-success-dim); }

.entry-desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
  margin-bottom: 0.55rem;
  max-width: 72ch;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.entry-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.entry-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.22rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: 0.74rem;
  font-family: var(--font-sans);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.12s;
}

.entry-link:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-dim);
  color: var(--color-accent);
}

.entry-link-count {
  font-size: 0.62rem;
  color: var(--color-text-muted);
  background: var(--color-surface-raised);
  padding: 0.02rem 0.3rem;
  border-radius: 99px;
}

.entry-link:hover .entry-link-count { color: var(--color-accent); }

.entry-details {
  border-style: dashed;
  font-weight: 600;
}

/* ===== Shared (modal) badges ===== */
.packet-type-label {
  font-size: 0.62rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  margin-bottom: 0.15rem;
}

.packet-overlays {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: 0.6rem;
}

.overlay-badge {
  padding: 0.1rem 0.45rem;
  border-radius: 99px;
  font-size: 0.62rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.overlay-audience {
  background: var(--color-purple-dim);
  color: var(--color-purple);
}

.overlay-level {
  background: var(--color-info-dim);
  color: var(--color-info);
}

.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 1000;
  justify-content: center;
  align-items: flex-start;
  padding: 3rem 1rem;
  overflow-y: auto;
  backdrop-filter: blur(4px);
}

.modal-overlay.open { display: flex; }

.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  max-width: 860px;
  width: 100%;
  max-height: calc(100vh - 6rem);
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  padding: 1.15rem 1.25rem 0.85rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.modal-header h2 { font-size: 1.15rem; font-weight: 700; }

.modal-close {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 0.2rem;
  line-height: 1;
  transition: color 0.15s;
}

.modal-close:hover { color: var(--color-text); }

.modal-body { padding: 1.15rem 1.25rem; }

.modal-section { margin-bottom: 1.15rem; }

.modal-section h3 {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: 0.4rem;
  font-weight: 600;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.3rem;
}

.content-group {
  margin-bottom: 1rem;
}

.content-group-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.65rem;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
  margin-bottom: 0.35rem;
}

.content-group-header:hover {
  border-color: var(--color-border-hover);
}

.content-group-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text);
}

.content-group-count {
  font-size: 0.68rem;
  color: var(--color-text-muted);
  background: var(--color-surface);
  padding: 0.1rem 0.4rem;
  border-radius: 99px;
}

.content-group-toggle {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  transition: transform 0.2s;
}

.content-group.expanded .content-group-toggle {
  transform: rotate(90deg);
}

.content-group-items {
  display: none;
  padding: 0 0.25rem;
}

.content-group.expanded .content-group-items {
  display: block;
}

.content-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.6rem;
  padding: 0.45rem 0.5rem;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.8rem;
  transition: background 0.1s;
}

.content-item:last-child { border-bottom: none; }

.content-item:hover { background: var(--color-surface-hover); }

.content-item a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.content-item a:hover { text-decoration: underline; }

.content-item-meta {
  font-size: 0.68rem;
  color: var(--color-text-muted);
  margin-left: auto;
  white-space: nowrap;
}

.content-item-desc {
  width: 100%;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
  padding-left: 1.6rem;
}

.loading-spinner {
  text-align: center;
  padding: 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.82rem;
}

.preview-content {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-height: 400px;
  overflow-y: auto;
  padding: 0.75rem;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.preview-content h1, .preview-content h2, .preview-content h3 {
  color: var(--color-text);
  margin-top: 0.75rem;
  margin-bottom: 0.35rem;
}

.preview-content h1 { font-size: 1.1rem; }
.preview-content h2 { font-size: 0.95rem; }
.preview-content h3 { font-size: 0.85rem; }
.preview-content p { margin-bottom: 0.5rem; }

.preview-content code {
  background: var(--color-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.preview-content pre {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.65rem;
  overflow-x: auto;
  margin-bottom: 0.5rem;
}

.preview-content pre code { background: none; padding: 0; }

.preview-content ul, .preview-content ol {
  padding-left: 1.25rem;
  margin-bottom: 0.5rem;
}

.preview-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 0.5rem;
  font-size: 0.78rem;
}

.preview-content th, .preview-content td {
  border: 1px solid var(--color-border);
  padding: 0.35rem 0.5rem;
  text-align: left;
}

.preview-content th { background: var(--color-surface); font-weight: 600; }
.preview-content a { color: var(--color-accent); }

.resource-list { list-style: none; }

.resource-item {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.resource-item:last-child { border-bottom: none; }

.resource-icon {
  width: 1.6rem;
  height: 1.6rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.78rem;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
}

.resource-info { flex: 1; }

.resource-title {
  font-weight: 600;
  font-size: 0.82rem;
  color: var(--color-accent);
  text-decoration: none;
}

.resource-title:hover { text-decoration: underline; }

.resource-desc {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.08rem;
}

.resource-access {
  font-size: 0.6rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0.06rem 0.3rem;
  border-radius: 99px;
}

.resource-access.public { background: var(--color-success-dim); color: var(--color-success); }
.resource-access.protected { background: var(--color-warning-dim); color: var(--color-warning); }

.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--color-text-muted);
}

.empty-state .icon { font-size: 2.5rem; margin-bottom: 0.75rem; opacity: 0.4; }

.empty-state h3 {
  font-size: 1rem;
  margin-bottom: 0.35rem;
  color: var(--color-text-secondary);
}

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  text-align: center;
  padding: 1rem;
  font-size: 0.72rem;
}

.site-footer a { color: var(--color-accent); text-decoration: none; }
.site-footer a:hover { color: #2d5ab8; }

@media (max-width: 600px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  .site-brand { flex-wrap: wrap; }
  .toolbar { padding: 0.75rem 1rem; }
  .content-area { padding: 0 1rem 2rem; }
  .filter-row { flex-direction: column; align-items: stretch; }
  .filter-group { justify-content: space-between; }
}