/* GenAI Daily Viewer - Stylesheet */
:root {
  --bg: #1a1a2e;
  --sidebar-bg: #16213e;
  --card-bg: #0f3460;
  --text: #e0e0e0;
  --text-muted: #a0a0b0;
  --border: #2a2a4e;
  --accent: #4A90E2;
  --header-bg: #0d0d1f;
  --search-bg: #1e1e3f;
  --btn-bg: #2a2a4e;
  --btn-active: #4A90E2;
  --btn-active-text: #ffffff;
  --spinner-color: #4A90E2;
  --shadow: rgba(0, 0, 0, 0.3);
}

body.light-mode {
  --bg: #f5f5f5;
  --sidebar-bg: #ffffff;
  --card-bg: #ffffff;
  --text: #333333;
  --text-muted: #666666;
  --border: #dddddd;
  --accent: #2563eb;
  --header-bg: #ffffff;
  --search-bg: #f0f0f0;
  --btn-bg: #e8e8e8;
  --btn-active: #2563eb;
  --btn-active-text: #ffffff;
  --spinner-color: #2563eb;
  --shadow: rgba(0, 0, 0, 0.1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

/* ── Header ── */
#header {
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px var(--shadow);
}

#header h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}

#dark-toggle {
  background: var(--btn-bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.2s;
}

#dark-toggle:hover {
  background: var(--btn-active);
  color: var(--btn-active-text);
}

/* ── Layout ── */
#layout {
  display: flex;
  height: calc(100vh - 56px);
  overflow: hidden;
}

/* ── Sidebar ── */
#sidebar {
  width: 180px;
  min-width: 140px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  flex-shrink: 0;
}

#sidebar-title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 1rem 1rem 0.5rem;
}

#date-list {
  list-style: none;
}

#date-list li {
  padding: 0.55rem 1rem;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-left: 3px solid transparent;
  transition: all 0.15s;
}

#date-list li:hover {
  background: var(--btn-bg);
  color: var(--text);
}

#date-list li.active {
  background: var(--btn-bg);
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
}

/* ── Main Content ── */
#main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Toolbar ── */
#toolbar {
  padding: 0.75rem 1.25rem;
  background: var(--sidebar-bg);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

#search-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#search-input {
  flex: 1;
  background: var(--search-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.45rem 0.8rem;
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.2s;
}

#search-input:focus {
  border-color: var(--accent);
}

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

#search-clear {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0.25rem 0.4rem;
  border-radius: 4px;
  transition: color 0.2s;
  display: none;
}

#search-clear:hover {
  color: var(--text);
}

#search-clear.visible {
  display: block;
}

/* ── Category Filter Buttons ── */
#category-filters {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.cat-btn {
  background: var(--btn-bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 20px;
  padding: 0.3rem 0.75rem;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.cat-btn:hover {
  color: var(--text);
  background: var(--btn-bg);
  border-color: var(--accent);
}

.cat-btn.active {
  background: var(--btn-active);
  color: var(--btn-active-text);
  border-color: transparent;
}

/* ── Card List ── */
#content-area {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 1.25rem;
}

#result-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

#cards-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* ── Topic Card ── */
.topic-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  border-left: 4px solid #4A90E2;
  transition: box-shadow 0.2s, transform 0.1s;
}

.topic-card:hover {
  box-shadow: 0 4px 12px var(--shadow);
  transform: translateY(-1px);
}

.topic-card[data-category="model"] { border-left-color: #4A90E2; }
.topic-card[data-category="paper"] { border-left-color: #7B68EE; }
.topic-card[data-category="api"]   { border-left-color: #F5A623; }
.topic-card[data-category="oss"]   { border-left-color: #50E3C2; }
.topic-card[data-category="news"]  { border-left-color: #B8E986; }
.topic-card[data-category="other"] { border-left-color: #888888; }

.card-header {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  margin-bottom: 0.5rem;
}

.card-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.card-summary {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 0.6rem;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-source-link {
  font-size: 0.8rem;
  color: var(--accent);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.card-source-link:hover {
  text-decoration: underline;
}

.card-date-badge {
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--search-bg);
  padding: 0.15rem 0.5rem;
  border-radius: 10px;
}

/* ── Loading Spinner ── */
#loading {
  display: none;
  align-items: center;
  justify-content: center;
  padding: 3rem;
}

#loading.visible {
  display: flex;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--spinner-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Empty / Error State ── */
#empty-state {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  text-align: center;
  color: var(--text-muted);
  gap: 0.75rem;
}

#empty-state.visible {
  display: flex;
}

#empty-state .empty-icon {
  font-size: 3rem;
}

#empty-state p {
  font-size: 0.9rem;
  max-width: 280px;
  line-height: 1.6;
}

/* ── Mobile Dropdown (< 768px) ── */
#mobile-date-row {
  display: none;
  padding: 0.5rem 1.25rem;
  background: var(--sidebar-bg);
  border-bottom: 1px solid var(--border);
  align-items: center;
  gap: 0.75rem;
}

#mobile-date-row label {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

#mobile-date-select {
  background: var(--search-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 0.35rem 0.6rem;
  font-size: 0.85rem;
  flex: 1;
  outline: none;
}

@media (max-width: 767px) {
  #sidebar {
    display: none;
  }
  #mobile-date-row {
    display: flex;
  }
  #layout {
    flex-direction: column;
  }
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

.card-stars {
  color: #ffd700;
  font-size: 0.9em;
  margin-left: 8px;
  white-space: nowrap;
}

/* ── OGP Thumbnail ── */
.card-thumbnail {
  margin: -1rem -1.25rem 0.75rem;
  overflow: hidden;
  border-radius: 6px 6px 0 0;
}

.card-thumbnail img {
  width: 100%;
  aspect-ratio: 1.91 / 1;
  object-fit: cover;
  display: block;
}

.card-feedback {
  display: flex;
  gap: 6px;
  margin-left: auto;
}
.fb-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
  cursor: pointer;
  font-size: 1.1em;
  transition: background 0.2s;
}
.fb-btn:hover {
  background: var(--sidebar-bg);
}
.fb-btn.fb-voted {
  background: var(--accent);
  border-color: var(--accent);
}
.fb-btn:disabled {
  opacity: 0.5;
  cursor: default;
}