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

:root {
  --bg-primary: #0f1117;
  --bg-secondary: #1a1d27;
  --bg-card: #1e2130;
  --bg-card-hover: #252840;
  --border: #2a2d3e;
  --border-light: #363a50;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #3b82f6;
  --accent-blue-hover: #2563eb;
  --accent-cyan: #06b6d4;
  --accent-green: #10b981;
  --accent-yellow: #f59e0b;
  --accent-orange: #f97316;
  --accent-red: #ef4444;
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.3);
}

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px 48px;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.header-left { display: flex; align-items: center; gap: 16px; }
.header-right { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }

.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon {
  font-size: 28px;
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  border-radius: var(--radius-lg);
}
.logo h1 { font-size: 22px; font-weight: 700; color: var(--text-primary); letter-spacing: -0.5px; }
.subtitle { font-size: 13px; color: var(--text-muted); font-weight: 400; }

.stats {
  display: flex; gap: 16px; font-size: 13px; color: var(--text-secondary);
}
.stat-item { display: flex; align-items: center; gap: 6px; }
.stat-dot { width: 8px; height: 8px; border-radius: 50%; }

/* Buttons */
.btn {
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary { background: var(--accent-blue); color: white; }
.btn-primary:hover { background: var(--accent-blue-hover); }
.btn-secondary { background: var(--bg-secondary); color: var(--text-secondary); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--border-light); color: var(--text-primary); }
.btn-danger { background: var(--accent-red); color: white; }
.btn-danger:hover { background: #dc2626; }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-icon {
  padding: 6px; background: transparent; border: none; color: var(--text-muted);
  cursor: pointer; border-radius: 6px; transition: all 0.2s;
}
.btn-icon:hover { background: var(--bg-card-hover); color: var(--text-primary); }

/* Filters */
.filters {
  display: flex; gap: 16px; margin-bottom: 24px; flex-wrap: wrap;
}
.filter-group { display: flex; flex-direction: column; gap: 6px; }
.filter-group label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-muted); }
.filter-group select, .filter-group input {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 14px;
  min-width: 180px;
}
.filter-group select:focus, .filter-group input:focus {
  outline: none; border-color: var(--accent-blue);
}
.search-group { flex: 1; min-width: 200px; }
.search-group input { width: 100%; }

/* Conference Cards */
.conference-list { display: flex; flex-direction: column; gap: 8px; }

.conf-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all 0.2s;
  overflow: hidden;
}
.conf-card:hover { border-color: var(--border-light); }
.conf-card.expanded { border-color: var(--accent-blue); }

.conf-card-header {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 16px 20px;
  cursor: pointer;
  gap: 16px;
}

.conf-main {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
  flex-wrap: wrap;
}

.conf-priority {
  width: 4px;
  height: 40px;
  border-radius: 2px;
  flex-shrink: 0;
}
.priority-High { background: var(--accent-red); }
.priority-Medium { background: var(--accent-yellow); }
.priority-Low { background: var(--accent-green); }

.conf-info { min-width: 0; flex: 1; }
.conf-name {
  font-size: 16px; font-weight: 600; color: var(--text-primary);
  margin-bottom: 4px;
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.conf-meta {
  display: flex; gap: 16px; font-size: 13px; color: var(--text-secondary); flex-wrap: wrap;
}
.conf-meta-item { display: flex; align-items: center; gap: 4px; white-space: nowrap; }

.conf-badges { display: flex; gap: 8px; align-items: center; flex-shrink: 0; flex-wrap: wrap; }

/* Status Badges */
.badge {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
  letter-spacing: 0.3px;
}
.badge-status {
  background: rgba(59,130,246,0.15); color: var(--accent-blue);
}
.badge-Hosting { background: rgba(139,92,246,0.15); color: var(--accent-purple); }
.badge-Speaking { background: rgba(16,185,129,0.15); color: var(--accent-green); }
.badge-Sponsoring { background: rgba(236,72,153,0.15); color: var(--accent-pink); }
.badge-Attending { background: rgba(6,182,212,0.15); color: var(--accent-cyan); }
.badge-Researching { background: rgba(245,158,11,0.15); color: var(--accent-yellow); }
.badge-Skipping { background: rgba(100,116,139,0.15); color: var(--text-muted); }
.badge-Applied { background: rgba(249,115,22,0.15); color: var(--accent-orange); }

.badge-priority { font-size: 11px; padding: 3px 8px; }
.badge-priority-High { background: rgba(239,68,68,0.1); color: var(--accent-red); }
.badge-priority-Medium { background: rgba(245,158,11,0.1); color: var(--accent-yellow); }
.badge-priority-Low { background: rgba(16,185,129,0.1); color: var(--accent-green); }

.conf-expand-icon {
  color: var(--text-muted);
  transition: transform 0.2s;
  font-size: 18px;
  flex-shrink: 0;
}
.conf-card.expanded .conf-expand-icon { transform: rotate(180deg); }

/* Expanded Details */
.conf-details {
  display: none;
  padding: 0 20px 20px;
  border-top: 1px solid var(--border);
}
.conf-card.expanded .conf-details { display: block; }

.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
  padding-top: 16px;
}
.detail-item label {
  font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.5px; color: var(--text-muted);
  display: block; margin-bottom: 4px;
}
.detail-item .value {
  font-size: 14px; color: var(--text-primary); word-break: break-word;
}
.detail-item .value a { color: var(--accent-blue); text-decoration: none; }
.detail-item .value a:hover { text-decoration: underline; }

.detail-notes {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.speaker-section {
  margin-top: 16px;
  padding: 16px;
  background: rgba(139,92,246,0.05);
  border: 1px solid rgba(139,92,246,0.15);
  border-radius: var(--radius);
}
.speaker-section h4 {
  font-size: 13px; font-weight: 600; color: var(--accent-purple);
  margin-bottom: 12px;
}
.speaker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.conf-actions {
  display: flex; gap: 8px; margin-top: 16px; justify-content: flex-end;
}

/* Modal */
.modal-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  z-index: 1000;
  justify-content: center;
  align-items: flex-start;
  padding: 40px 16px;
  overflow-y: auto;
}
.modal-overlay.active { display: flex; }

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 720px;
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5);
}
.modal-sm { max-width: 420px; }

.modal-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}
.modal-header h2 { font-size: 18px; font-weight: 600; }
.modal-close {
  background: none; border: none; color: var(--text-muted);
  font-size: 24px; cursor: pointer; padding: 4px 8px; border-radius: 6px;
}
.modal-close:hover { background: var(--bg-card-hover); color: var(--text-primary); }

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 24px;
}
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full-width { grid-column: 1 / -1; }
.form-group label {
  font-size: 12px; font-weight: 600; color: var(--text-secondary);
}
.form-group input, .form-group select, .form-group textarea {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 10px 12px;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 14px;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--accent-blue);
}
.form-group textarea { resize: vertical; }

.form-divider {
  padding-top: 8px;
  border-top: 1px solid var(--border);
}
.form-divider h3 { font-size: 14px; font-weight: 600; color: var(--accent-purple); }

.form-actions {
  display: flex; justify-content: flex-end; gap: 12px;
  padding: 16px 24px;
  border-top: 1px solid var(--border);
}

/* Empty State */
.empty-state {
  text-align: center; padding: 80px 20px;
  color: var(--text-muted);
}
.empty-state .icon { font-size: 48px; margin-bottom: 16px; }
.empty-state h3 { font-size: 18px; margin-bottom: 8px; color: var(--text-secondary); }

/* TBD date indicator */
.date-tbd {
  font-style: italic;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .app { padding: 0 12px 32px; }
  .header { flex-direction: column; align-items: flex-start; }
  .header-right { width: 100%; justify-content: space-between; }
  .filters { flex-direction: column; }
  .filter-group select, .filter-group input { min-width: unset; width: 100%; }
  .conf-card-header { grid-template-columns: 1fr; }
  .conf-badges { margin-top: 8px; }
  .form-grid { grid-template-columns: 1fr; }
  .detail-grid { grid-template-columns: 1fr; }
  .stats { flex-wrap: wrap; }
}

/* Speaker Draft Styles */
.draft-section {
  margin-top: 16px;
  padding: 16px;
  background: rgba(139, 92, 246, 0.05);
  border: 1px solid rgba(139, 92, 246, 0.15);
  border-radius: 8px;
}
.draft-section h5 {
  margin: 0 0 8px 0;
  color: var(--accent-purple, #8b5cf6);
  font-size: 14px;
  font-weight: 600;
}
.draft-text {
  color: #cbd5e1;
  font-size: 13px;
  line-height: 1.7;
  white-space: pre-wrap;
}
.apply-link {
  color: var(--accent-green, #22c55e) !important;
  font-weight: 600;
  text-decoration: none;
}
.apply-link:hover {
  text-decoration: underline;
}
.badge-speaker-draft {
  background: rgba(234, 179, 8, 0.15);
  color: #eab308;
}
.badge-speaker-submitted {
  background: rgba(59, 130, 246, 0.15);
  color: #3b82f6;
}
.badge-speaker-accepted {
  background: rgba(34, 197, 94, 0.15);
  color: #22c55e;
}
.badge-speaker-rejected {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
}