@import url('https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,400;12..96,500;12..96,600;12..96,700&display=swap');

:root {
  --bg: #ffffff;
  --panel: #fafafa;
  --panel-2: #ffffff;
  --border: #ebebeb;
  --text: #171717;
  --muted: #636363;
  --accent: #171717;
  --accent-2: #171717;
  --accent-bg: rgba(0,0,0,0.04);
  --chip-bg: rgba(0,0,0,0.05);
  --tag-bg: rgba(0,0,0,0.04);
  --tag-fg: #171717;
  --ok: #171717;
  --warn: #f97316;
  --font: 'Bricolage Grotesque', sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font: calc(16px * var(--font-scale, 1)) / 1.5 var(--font);
}

.app-header {
  height: 52px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
}

.app-title {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.3px;
}
.app-dates { color: var(--muted); font-size: 13px; }

.app-body {
  display: flex;
  min-height: calc(100vh - 52px);
  padding-top: 52px;
}

.sidebar {
  width: 260px;
  flex-shrink: 0;
  padding: 20px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  position: sticky;
  top: 52px;
  max-height: calc(100vh - 52px);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.main {
  flex: 1;
  padding: 24px 40px;
  min-width: 0;
}

.filter-summary {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  margin-bottom: 20px;
  font-size: 0.8125rem;
  color: var(--muted);
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.filter-summary:empty { display: none; }

.day-section { margin-bottom: 32px; }
.day-section-header {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  margin-bottom: 16px;
  letter-spacing: -0.3px;
}

.time-row {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 16px;
}
.time-label {
  width: 80px;
  flex-shrink: 0;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--muted);
  padding-top: 14px;
}
.time-slot {
  flex: 1;
  display: flex;
  gap: 12px;
  min-width: 0;
  flex-wrap: wrap;
}

.session-card {
  flex: 1 1 280px;
  min-width: 240px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  cursor: pointer;
  transition: box-shadow 0.2s, border-color 0.2s;
  position: relative;
}
.session-card:hover {
  border-color: #ccc;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}
.session-card.expanded { border-color: #ccc; }

.session-title {
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.9375rem;
  line-height: 1.4;
  padding-right: 24px;
}
.session-meta {
  color: var(--muted);
  font-size: 0.75rem;
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.division-tag {
  background: var(--tag-bg);
  color: var(--tag-fg);
  font-size: 0.6875rem;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 100px;
}

.session-detail {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  display: none;
  font-size: 0.875rem;
}
.session-card.expanded .session-detail { display: block; }

.detail-label {
  font-size: 0.625rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 8px;
  font-weight: 600;
}
.detail-person { font-size: 0.8125rem; margin-left: 10px; }
.detail-paper { font-size: 0.8125rem; margin: 3px 0 3px 10px; }
.detail-paper .author { color: var(--muted); font-size: 0.75rem; }

.empty-state {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
}
.empty-state-inner { max-width: 360px; }
.empty-state .empty-icon { font-size: 42px; opacity: 0.4; margin-bottom: 10px; }
.empty-state h2 { margin: 0 0 8px; font-size: 1.25rem; }
.empty-state p { color: var(--muted); }
.empty-state .empty-hint {
  margin-top: 14px;
  background: var(--accent-bg);
  border-left: 3px solid var(--accent);
  padding: 10px 14px;
  border-radius: 4px;
  font-size: 0.75rem;
  text-align: left;
  color: var(--muted);
}

.sidebar-section { margin-bottom: 20px; }
.sidebar-section h4 {
  margin: 0 0 10px;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.sidebar-footer {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 0.625rem;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.sidebar-footer .footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
}
.sidebar-footer .footer-row .reset-btn { flex-shrink: 0; }
.sidebar-footer .footer-row:first-child > span:first-child {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sidebar-footer .footer-row:last-child .io-btn { flex: 1; }
.io-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.625rem;
  padding: 6px 12px;
  min-height: 36px;
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.io-btn:hover { color: var(--text); border-color: #ccc; }

.summary-chip {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 100px;
}
.summary-preset {
  background: var(--chip-bg);
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
}
.summary-count {
  margin-left: auto;
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 600;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 4px 0;
  font-size: 0.875rem;
  color: var(--text);
  cursor: pointer;
}
.check-row .count {
  margin-left: auto;
  color: var(--muted);
  font-size: 0.625rem;
}
.check-row input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  border: 2px solid var(--muted);
  border-radius: 3px;
  cursor: pointer;
  position: relative;
  background: var(--bg);
  transition: border-color 0.15s, background 0.15s;
}
.check-row input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}
.check-row input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 1px;
  width: 6px;
  height: 10px;
  border: solid var(--bg);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.sidebar-search {
  width: 100%;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.8125rem;
  padding: 8px 10px;
  margin-bottom: 8px;
}
.sidebar-search:focus { outline: none; border-color: var(--text); }
.check-list {
  max-height: 200px;
  overflow-y: auto;
  padding-right: 6px;
}

.author-wrap { position: relative; }
.author-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  z-index: 5;
  max-height: 200px;
  overflow-y: auto;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.author-dropdown:empty { display: none; }
.dd-item {
  padding: 10px;
  min-height: 40px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
.dd-item:hover { background: var(--accent-bg); }
.dd-name { font-size: 0.8125rem; color: var(--text); }
.dd-affil { font-size: 0.6875rem; color: var(--muted); }

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
}
.chip {
  background: var(--chip-bg);
  color: var(--text);
  font-size: 0.625rem;
  padding: 2px 8px;
  border-radius: 100px;
  cursor: pointer;
}
.preset-list {
  background: var(--accent-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px;
  margin-bottom: 4px;
  min-height: 30px;
}
.preset-empty {
  color: var(--muted);
  font-size: 0.625rem;
  text-align: center;
  padding: 6px 0;
}
.preset-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 7px;
  font-size: 0.8125rem;
  color: var(--text);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.1s;
}
.preset-item:hover { background: rgba(0,0,0,0.03); }
.preset-item.active { background: var(--chip-bg); font-weight: 600; }
.preset-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--text);
  display: inline-block;
}
.preset-item.active .preset-dot { box-shadow: 0 0 0 2px rgba(0,0,0,0.15); }
.preset-btn {
  display: block;
  width: 100%;
  background: rgba(0,0,0,0.02);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.6875rem;
  padding: 5px 8px;
  border-radius: 6px;
  cursor: pointer;
  margin-top: 4px;
  transition: background 0.1s;
}
.preset-btn.primary {
  background: var(--chip-bg);
  border-color: #ddd;
}
.preset-mod { color: var(--warn); font-size: 0.75rem; }
.preset-actions {
  margin-left: auto;
  display: flex;
  gap: 2px;
  opacity: 0;
  transition: opacity 0.1s;
}
.preset-item:hover .preset-actions { opacity: 1; }
.preset-action {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 0.75rem;
  padding: 1px 4px;
  cursor: pointer;
}
.preset-action:hover { color: var(--text); }
.reset-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.625rem;
  padding: 6px 12px;
  min-height: 36px;
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.reset-btn:hover { color: var(--text); border-color: #ccc; }

.fav-star {
  position: absolute;
  top: 2px;
  right: 4px;
  width: 44px;
  height: 44px;
  font-size: 0;
  color: transparent;
  cursor: pointer;
  background: none;
  border: none;
  padding: 11px;
  background-size: 22px 22px;
  background-repeat: no-repeat;
  background-position: center;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolygon points='12,2 15.09,8.26 22,9.27 17,14.14 18.18,21.02 12,17.77 5.82,21.02 7,14.14 2,9.27 8.91,8.26' fill='none' stroke='%23ccc' stroke-width='1.8' stroke-linejoin='round'/%3E%3C/svg%3E");
  transition: transform 0.15s;
  z-index: 1;
}
.fav-star:hover { transform: scale(1.15); }
.fav-star.on {
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolygon points='12,2 15.09,8.26 22,9.27 17,14.14 18.18,21.02 12,17.77 5.82,21.02 7,14.14 2,9.27 8.91,8.26' fill='%23f97316' stroke='%23f97316' stroke-width='1.8' stroke-linejoin='round'/%3E%3C/svg%3E");
}

/* ── Header controls ──────────────────────────────── */

.drawer-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text);
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
}

.header-controls {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 2px;
}

.font-btn {
  background: none;
  border: 1px solid transparent;
  color: var(--muted);
  font-size: 13px;
  font-family: var(--font);
  font-weight: 500;
  padding: 4px 8px;
  min-width: 36px;
  min-height: 36px;
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.font-btn:hover {
  color: var(--text);
  border-color: var(--border);
}
.font-btn.active {
  color: var(--text);
  font-weight: 700;
  border-bottom: 2px solid var(--accent);
}

.contrast-btn {
  background: none;
  border: 1px solid transparent;
  font-size: 18px;
  color: var(--muted);
  padding: 4px 8px;
  min-width: 36px;
  min-height: 36px;
  border-radius: 6px;
  cursor: pointer;
  margin-left: 4px;
  transition: color 0.15s, border-color 0.15s;
}
.contrast-btn:hover {
  color: var(--text);
  border-color: var(--border);
}
.contrast-btn[aria-pressed="true"] {
  color: var(--text);
  background: var(--chip-bg);
}

.drawer-overlay {
  display: none;
}

/* ── Focus indicators ─────────────────────────────── */

.check-row input[type="checkbox"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.fav-star:focus-visible,
.io-btn:focus-visible,
.reset-btn:focus-visible,
.preset-btn:focus-visible,
.preset-action:focus-visible,
.preset-item:focus-visible,
.sidebar-search:focus-visible,
.session-card:focus-visible,
.font-btn:focus-visible,
.contrast-btn:focus-visible,
.drawer-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.dd-item:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

/* ── High contrast mode ───────────────────────────── */

.high-contrast {
  --bg: #ffffff;
  --panel: #f0f0f0;
  --panel-2: #ffffff;
  --border: #000000;
  --text: #000000;
  --muted: #444444;
  --accent: #000000;
  --accent-2: #000000;
  --accent-bg: rgba(0,0,0,0.08);
  --chip-bg: rgba(0,0,0,0.1);
  --tag-bg: rgba(0,0,0,0.08);
  --tag-fg: #000000;
  --ok: #000000;
}

.high-contrast .session-card {
  border-width: 2px;
}

.high-contrast .check-row input[type="checkbox"] {
  border-width: 2px;
}

@media (prefers-contrast: more) {
  :root:not(.no-auto-contrast) {
    --bg: #ffffff;
    --panel: #f0f0f0;
    --panel-2: #ffffff;
    --border: #000000;
    --text: #000000;
    --muted: #444444;
    --accent: #000000;
    --accent-2: #000000;
    --accent-bg: rgba(0,0,0,0.08);
    --chip-bg: rgba(0,0,0,0.1);
    --tag-bg: rgba(0,0,0,0.08);
    --tag-fg: #000000;
    --ok: #000000;
  }
}

/* ── Reduced motion ───────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* ── Mobile responsive (≤768px) ───────────────────── */

@media (max-width: 768px) {
  .drawer-toggle {
    display: block;
  }

  .app-header {
    padding: 0 12px;
    gap: 8px;
  }

  .app-dates {
    display: none;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 85vw;
    max-width: 360px;
    height: 100vh;
    max-height: 100vh;
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    border-right: 1px solid var(--border);
    box-shadow: none;
    padding-top: 16px;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0,0,0,0.15);
  }

  .drawer-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.3);
    z-index: 99;
  }

  .drawer-overlay.visible {
    display: block;
  }

  .main {
    padding: 16px;
  }

  .filter-summary {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
  }

  .time-row {
    flex-direction: column;
    gap: 8px;
  }

  .time-label {
    width: auto;
    padding-top: 0;
  }

  .time-slot {
    flex-direction: column;
  }

  .session-card {
    flex: 1 1 100%;
    min-width: 0;
  }

  .drawer-close-row {
    display: block;
    padding: 12px 0;
    margin-top: 8px;
  }

  .drawer-close-btn {
    display: block;
    width: 100%;
    background: var(--accent);
    color: var(--bg);
    border: none;
    font-size: 0.875rem;
    font-family: var(--font);
    font-weight: 600;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
  }
}

@media (min-width: 769px) {
  .drawer-close-row {
    display: none;
  }
}