/* ================================================================
   Bilibili Dynamic Archive — Stylesheet
   ================================================================ */

/* ------------------------------------------------------------------
   CSS Custom Properties (Theme)
   ------------------------------------------------------------------ */
:root {
  --c-bg: #f8f9fb;
  --c-surface: #ffffff;
  --c-text: #1a1a2e;
  --c-text-dim: #6b7280;
  --c-text-faint: #9ca3af;
  --c-border: #e5e7eb;
  --c-border-light: #f3f4f6;
  --c-accent: #2563eb;
  --c-accent-hover: #1d4ed8;
  --c-accent-soft: #dbeafe;
  --c-tag-bg: #eef2ff;
  --c-tag-text: #4338ca;
  --c-overlay: rgba(0, 0, 0, 0.92);
  --c-skeleton: #e5e7eb;
  --c-skeleton-shine: #f3f4f6;
  --c-scrollbar-thumb: #c4c9d0;
  --c-scrollbar-track: #f0f1f3;
  --c-expand-btn: #f3f4f6;
  --c-expand-btn-hover: #e5e7eb;
  --c-footer: #9ca3af;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-tile-hover: 0 4px 20px rgba(0, 0, 0, 0.18);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --tile-height: 320px;
  --font-mono: "SF Mono", "Cascadia Code", "Consolas", monospace;
}

[data-theme="dark"] {
  --c-bg: #0b1120;
  --c-surface: #111827;
  --c-text: #e2e8f0;
  --c-text-dim: #94a3b8;
  --c-text-faint: #64748b;
  --c-border: #1e293b;
  --c-border-light: #1a2332;
  --c-accent: #60a5fa;
  --c-accent-hover: #93c5fd;
  --c-accent-soft: #1e3a5f;
  --c-tag-bg: #1e3a5f;
  --c-tag-text: #93c5fd;
  --c-overlay: rgba(0, 0, 0, 0.96);
  --c-skeleton: #1e293b;
  --c-skeleton-shine: #253349;
  --c-scrollbar-thumb: #334155;
  --c-scrollbar-track: #0f172a;
  --c-expand-btn: #1e293b;
  --c-expand-btn-hover: #334155;
  --c-footer: #64748b;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-tile-hover: 0 4px 20px rgba(96, 165, 250, 0.15);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.5;
  min-height: 100vh;
  transition: background 0.3s ease, color 0.3s ease;
}

a {
  color: var(--c-accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

img {
  display: block;
  max-width: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input {
  font-family: inherit;
}

/* ------------------------------------------------------------------
   Site Header
   ------------------------------------------------------------------ */
.site-header {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: var(--c-expand-btn);
  transition: background 0.2s;
}
.theme-toggle:hover {
  background: var(--c-expand-btn-hover);
}
.theme-toggle .icon-sun,
.theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: inline; }
[data-theme="dark"] .theme-toggle .icon-sun { display: inline; }

/* ------------------------------------------------------------------
   Search Bar
   ------------------------------------------------------------------ */
.search-bar {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 20px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-input {
  flex: 1;
  max-width: 480px;
  padding: 10px 16px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  background: var(--c-surface);
  color: var(--c-text);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-input::placeholder {
  color: var(--c-text-faint);
}
.search-input:focus {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px var(--c-accent-soft);
}

.search-clear {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: var(--c-text-dim);
  background: var(--c-expand-btn);
  flex-shrink: 0;
}
.search-clear:hover {
  background: var(--c-expand-btn-hover);
}

.search-status {
  font-size: 0.85rem;
  color: var(--c-text-dim);
  white-space: nowrap;
}

/* ------------------------------------------------------------------
   Main Content
   ------------------------------------------------------------------ */
.main-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px 20px 40px;
  min-height: 50vh;
}

/* ------------------------------------------------------------------
   Loading Skeleton
   ------------------------------------------------------------------ */
.skeleton-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 12px;
  animation: shimmer 1.5s infinite;
}
.skel-line {
  height: 14px;
  background: var(--c-skeleton);
  border-radius: 4px;
  margin-bottom: 10px;
}
.skel-line:last-child { margin-bottom: 0; }
.w-25 { width: 25%; }
.w-30 { width: 30%; }
.w-35 { width: 35%; }
.w-40 { width: 40%; }
.w-50 { width: 50%; }
.w-55 { width: 55%; }
.w-60 { width: 60%; }

@keyframes shimmer {
  0%   { opacity: 1; }
  50%  { opacity: 0.5; }
  100% { opacity: 1; }
}

/* ------------------------------------------------------------------
   Error & Empty States
   ------------------------------------------------------------------ */
.error-state {
  text-align: center;
  padding: 60px 20px;
}

.error-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #fef2f2;
  color: #dc2626;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0 auto 16px;
}
[data-theme="dark"] .error-icon {
  background: #450a0a;
}

.error-message {
  color: var(--c-text-dim);
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.error-retry {
  padding: 8px 24px;
  border-radius: var(--radius-sm);
  background: var(--c-accent);
  color: #fff;
  font-size: 0.9rem;
  transition: background 0.2s;
}
.error-retry:hover {
  background: var(--c-accent-hover);
}

.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--c-text-dim);
}
.empty-sub {
  font-size: 0.85rem;
  color: var(--c-text-faint);
  margin-top: 6px;
}

.no-results {
  text-align: center;
  padding: 40px 20px;
  color: var(--c-text-dim);
}
.no-results p {
  margin-bottom: 12px;
}

/* ------------------------------------------------------------------
   Timeline
   ------------------------------------------------------------------ */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ------------------------------------------------------------------
   Dynamic Card
   ------------------------------------------------------------------ */
.dynamic-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.3s;
}
.dynamic-card:hover {
  border-color: var(--c-accent-soft);
}
.dynamic-card.expanded {
  border-color: var(--c-accent-soft);
  box-shadow: var(--shadow-md);
}

/* --- Card Header --- */
.card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
}

.card-date {
  font-size: 0.82rem;
  color: var(--c-text-faint);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.card-title {
  font-size: 0.95rem;
  font-weight: 500;
  flex: 1;
  min-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.75rem;
  background: var(--c-tag-bg);
  color: var(--c-tag-text);
  border-radius: 4px;
  white-space: nowrap;
}

.image-count-badge {
  font-size: 0.78rem;
  color: var(--c-text-dim);
  white-space: nowrap;
}

.bilibili-link {
  font-size: 0.78rem;
  white-space: nowrap;
}

/* --- Expand button --- */
.expand-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 10px;
  padding: 5px 14px;
  font-size: 0.82rem;
  border-radius: var(--radius-sm);
  background: var(--c-expand-btn);
  color: var(--c-text-dim);
  transition: background 0.2s, color 0.2s;
}
.expand-btn:hover {
  background: var(--c-expand-btn-hover);
  color: var(--c-text);
}
.expand-btn .arrow {
  display: inline-block;
  transition: transform 0.2s;
  font-size: 0.7rem;
}
.dynamic-card.expanded .expand-btn .arrow {
  transform: rotate(180deg);
}

/* --- Image track --- */
.card-images {
  margin-top: 12px;
  overflow: hidden;
}

.image-track {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 6px 2px 10px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

.image-track::-webkit-scrollbar {
  height: 4px;
}
.image-track::-webkit-scrollbar-track {
  background: var(--c-scrollbar-track);
  border-radius: 2px;
}
.image-track::-webkit-scrollbar-thumb {
  background: var(--c-scrollbar-thumb);
  border-radius: 2px;
}

/* --- Image tile --- */
.image-tile {
  flex-shrink: 0;
  scroll-snap-align: start;
  border-radius: 4px;
  overflow: hidden;
  background: var(--c-skeleton);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.image-tile:hover {
  transform: scale(1.04);
  box-shadow: var(--shadow-tile-hover);
  z-index: 2;
}

.image-tile img {
  height: 100%;
  width: 100%;
  display: block;
  transition: opacity 0.3s;
}
.image-tile img[loading] {
  opacity: 0;
}
.image-tile img.loaded {
  opacity: 1;
}

/* Placeholder for failed images */
.image-tile .tile-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--c-text-faint);
  background: var(--c-skeleton);
}

/* ------------------------------------------------------------------
   Lightbox
   ------------------------------------------------------------------ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--c-overlay);
  display: flex;
  flex-direction: column;
  animation: lbFadeIn 0.2s ease;
}

@keyframes lbFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.lb-close {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1010;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}
.lb-close:hover {
  background: rgba(255, 255, 255, 0.25);
}

.lb-nav {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1010;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  user-select: none;
}
.lb-nav:hover {
  background: rgba(255, 255, 255, 0.25);
}
.lb-prev { left: 16px; }
.lb-next { right: 16px; }

.lb-counter {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1010;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.85rem;
  font-family: var(--font-mono);
  background: rgba(0, 0, 0, 0.4);
  padding: 4px 14px;
  border-radius: 12px;
}

.lb-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 20px;
  -webkit-overflow-scrolling: touch;
}

.lb-content img {
  display: block;
  max-width: 90vw;
  height: auto;
  user-select: none;
  -webkit-user-drag: none;
}

/* ------------------------------------------------------------------
   Footer
   ------------------------------------------------------------------ */
.site-footer {
  text-align: center;
  padding: 24px 20px 32px;
  font-size: 0.78rem;
  color: var(--c-footer);
  border-top: 1px solid var(--c-border-light);
}
.footer-credit {
  margin-top: 4px;
}

/* ------------------------------------------------------------------
   Responsive
   ------------------------------------------------------------------ */
@media (max-width: 768px) {
  :root {
    --tile-height: 240px;
  }

  .header-inner {
    padding: 10px 14px;
  }

  .search-bar {
    padding: 12px 14px 0;
  }
  .search-input {
    max-width: 100%;
  }

  .main-content {
    padding: 16px 14px 32px;
  }

  .dynamic-card {
    padding: 12px 14px;
  }

  .card-header {
    gap: 6px 10px;
  }
  .card-title {
    font-size: 0.88rem;
    min-width: 0;
  }

  .lb-nav {
    width: 40px;
    height: 40px;
    font-size: 1.6rem;
  }
  .lb-prev { left: 8px; }
  .lb-next { right: 8px; }
}

@media (max-width: 480px) {
  :root {
    --tile-height: 200px;
  }

  .site-title {
    font-size: 1rem;
  }

  .expand-btn {
    font-size: 0.78rem;
    padding: 4px 10px;
  }

  .lb-content {
    padding: 30px 10px;
  }
  .lb-content img {
    max-width: 95vw;
  }
}