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

:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #1a1a1a;
  --text-secondary: #555;
  --accent: #2563eb;
  --border: #e0e0e0;
  --radius: 8px;
  --cfp-open: #16a34a;
  --cfp-closed: #dc2626;
  --cfp-soon: #ea580c;
}

[data-theme="dark"] {
  --bg: #0f0f1a;
  --surface: #1a1a2e;
  --text: #e0e0e0;
  --text-secondary: #aaa;
  --accent: #60a5fa;
  --border: #2a2a3e;
  --cfp-open: #4ade80;
  --cfp-closed: #f87171;
  --cfp-soon: #fb923c;
}

@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    --bg: #0f0f1a;
    --surface: #1a1a2e;
    --text: #e0e0e0;
    --text-secondary: #aaa;
    --accent: #60a5fa;
    --border: #2a2a3e;
    --cfp-open: #4ade80;
    --cfp-closed: #f87171;
    --cfp-soon: #fb923c;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  min-height: 100dvh;
}

.container { padding: 16px; max-width: 960px; margin: 0 auto; }
.hidden { display: none !important; }

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

header h1 { font-size: 1.2rem; }

.last-updated {
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2px 10px;
}

.icon-btn {
  background: none;
  color: var(--text-secondary);
  font-size: 1.4rem;
  padding: 4px 8px;
  border: none;
  cursor: pointer;
}

/* Filter bar */
#filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
  align-items: center;
}

#filters select,
#filters input[type="text"] {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 0.9rem;
}

#filters select { min-width: 140px; }

#search-input {
  flex: 1;
  min-width: 180px;
}

#cfp-only-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
}

/* Stats bar */
#stats-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

#stats {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

#fav-actions {
  display: flex;
  gap: 6px;
}

.export-btn {
  font-size: 0.8rem;
  padding: 4px 12px;
  background: var(--surface);
  color: var(--accent);
  border: 1px solid var(--accent);
}

.export-btn:hover { background: var(--accent); color: #fff; }

/* Section dividers */
.section-divider {
  font-size: 0.85rem;
  font-weight: bold;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 8px 0 4px;
  margin-top: 8px;
  border-bottom: 2px solid var(--border);
}

/* Conference cards */
.conf-list { display: flex; flex-direction: column; gap: 12px; }

.conf-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.conf-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 8px;
}

.conf-name {
  font-size: 1.05rem;
  font-weight: bold;
  line-height: 1.4;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.conf-name a {
  color: var(--accent);
  text-decoration: none;
}

.conf-name a:hover { text-decoration: underline; }

/* Favorite button */
.fav-btn {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0;
  color: var(--text-secondary);
  flex-shrink: 0;
  line-height: 1;
}

.fav-btn.active { color: #f59e0b; }
.fav-btn:hover { opacity: 0.7; }

.conf-card.fav { border-left: 3px solid #f59e0b; }

#fav-only-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
}

.conf-status {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 12px;
  white-space: nowrap;
  font-weight: bold;
}

.status-upcoming { background: #dbeafe; color: #1d4ed8; }
.status-ongoing { background: #dcfce7; color: #166534; }
.status-ended { background: #f3f4f6; color: #6b7280; }

[data-theme="dark"] .status-upcoming { background: #1e3a5f; color: #93c5fd; }
[data-theme="dark"] .status-ongoing { background: #14532d; color: #86efac; }
[data-theme="dark"] .status-ended { background: #374151; color: #9ca3af; }

@media (prefers-color-scheme: dark) {
  [data-theme="auto"] .status-upcoming { background: #1e3a5f; color: #93c5fd; }
  [data-theme="auto"] .status-ongoing { background: #14532d; color: #86efac; }
  [data-theme="auto"] .status-ended { background: #374151; color: #9ca3af; }
}

.conf-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.conf-meta span { white-space: nowrap; }

.conf-summary {
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.conf-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.tag {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 12px;
  background: var(--bg);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.tag.clickable { cursor: pointer; }
.tag.clickable:hover { border-color: var(--accent); color: var(--accent); }
.tag.tag-active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Active tag filter bar */
.active-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 12px;
}

.active-tag {
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

.active-tag:hover { opacity: 0.8; }

.clear-tags {
  background: var(--surface);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.clear-tags:hover { color: var(--text); }

.cfp-badge {
  font-size: 0.8rem;
  padding: 2px 10px;
  border-radius: 12px;
  font-weight: bold;
}

.cfp-open { background: #dcfce7; color: var(--cfp-open); }
.cfp-closed { background: #fee2e2; color: var(--cfp-closed); }
.cfp-soon { background: #fff7ed; color: var(--cfp-soon); }

[data-theme="dark"] .cfp-open { background: #14532d; }
[data-theme="dark"] .cfp-closed { background: #450a0a; }
[data-theme="dark"] .cfp-soon { background: #431407; }

@media (prefers-color-scheme: dark) {
  [data-theme="auto"] .cfp-open { background: #14532d; }
  [data-theme="auto"] .cfp-closed { background: #450a0a; }
  [data-theme="auto"] .cfp-soon { background: #431407; }
}

/* Loading / Error */
#loading {
  text-align: center;
  padding: 40px;
  color: var(--text-secondary);
}

#error {
  text-align: center;
  padding: 20px;
  color: #e74c3c;
  background: var(--surface);
  border-radius: var(--radius);
}

/* Settings modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}

.modal-content {
  background: var(--surface);
  padding: 24px;
  border-radius: var(--radius);
  width: 100%;
  max-width: 400px;
}

.modal-content h2 { margin-bottom: 16px; }

.modal-content label {
  display: block;
  margin-bottom: 12px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.modal-content label select {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
}

.modal-actions {
  display: flex;
  gap: 8px;
  margin-top: 20px;
}

button {
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  touch-action: manipulation;
}

button:active { opacity: 0.8; }

/* View toggle */
#stats-right {
  display: flex;
  gap: 8px;
  align-items: center;
}

#view-toggle {
  display: flex;
  gap: 2px;
}

.view-btn {
  font-size: 0.8rem;
  padding: 4px 10px;
  background: var(--surface);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  cursor: pointer;
}

.view-btn:first-child { border-radius: var(--radius) 0 0 var(--radius); }
.view-btn:last-child { border-radius: 0 var(--radius) var(--radius) 0; }
.view-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Calendar */
.cal-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 12px;
}

.cal-nav button {
  font-size: 0.9rem;
  padding: 6px 14px;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.cal-nav span { font-size: 1rem; font-weight: bold; min-width: 140px; text-align: center; }

.cal-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  font-size: 0.75rem;
  font-weight: bold;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}

.cal-day {
  min-height: 80px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 4px;
  font-size: 0.75rem;
  overflow: hidden;
}

.cal-day.empty { background: transparent; border-color: transparent; }
.cal-day.today { border-color: var(--accent); border-width: 2px; }

.cal-day-num {
  font-weight: bold;
  color: var(--text-secondary);
  margin-bottom: 2px;
}

.cal-day.today .cal-day-num { color: var(--accent); }

.cal-event {
  display: block;
  padding: 1px 4px;
  margin-bottom: 1px;
  border-radius: 3px;
  font-size: 0.65rem;
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
  background: #dbeafe;
  color: #1d4ed8;
  text-decoration: none;
}

.cal-event:hover { opacity: 0.8; }
.cal-event.fav { border-left: 2px solid #f59e0b; }

[data-theme="dark"] .cal-event { background: #1e3a5f; color: #93c5fd; }
@media (prefers-color-scheme: dark) {
  [data-theme="auto"] .cal-event { background: #1e3a5f; color: #93c5fd; }
}

.cal-more {
  font-size: 0.6rem;
  color: var(--accent);
  cursor: pointer;
}

/* Responsive */
@media (max-width: 600px) {
  .conf-card-header { flex-direction: column; }
  #filters { flex-direction: column; }
  #filters select, #search-input { width: 100%; }
  .cal-day { min-height: 50px; padding: 1px 2px; }
  .cal-event { font-size: 0.55rem; }
  #stats-right { flex-wrap: wrap; }
}