/* ─── Variables ─────────────────────────────────────────────────────────────── */
:root {
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --primary-light: #eef2ff;
  --accent: #7c3aed;
  --success: #059669;
  --success-light: #d1fae5;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --white: #ffffff;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.10), 0 4px 8px rgba(0,0,0,.04);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

img { max-width: 100%; }

/* ─── Layout ────────────────────────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

main { flex: 1; padding: 2rem 0; }

/* ─── Header / Nav ──────────────────────────────────────────────────────────── */
.site-header {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  padding: 0;
  box-shadow: var(--shadow-md);
}

.site-header .header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

.site-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.2);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.site-logo .logo-text {
  font-size: 1.15rem;
  font-weight: 700;
  color: white;
  letter-spacing: -0.01em;
}

.site-logo .logo-tld {
  color: rgba(255,255,255,0.7);
  font-weight: 400;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav a {
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.site-nav a:hover,
.site-nav a.active {
  background: rgba(255,255,255,0.18);
  color: white;
}

.site-nav .btn-nav-cta {
  background: white;
  color: var(--primary);
  font-weight: 600;
  padding: 0.4rem 1rem;
}

.site-nav .btn-nav-cta:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
}

/* ─── Hero ──────────────────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  color: white;
  padding: 3rem 1.25rem 2.5rem;
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.hero p {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.85);
  max-width: 540px;
  margin: 0 auto;
}

/* ─── Filter Bar ────────────────────────────────────────────────────────────── */
.filter-bar {
  background: white;
  border-bottom: 1px solid var(--gray-200);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.filter-bar .filter-inner {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

.filter-bar input[type="text"],
.filter-bar select {
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: var(--font);
  background: white;
  color: var(--gray-800);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.filter-bar input[type="text"]:focus,
.filter-bar select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.15);
}

.filter-bar input[type="text"] {
  flex: 1;
  min-width: 180px;
}

.filter-bar .filter-count {
  margin-left: auto;
  font-size: 0.85rem;
  color: var(--gray-500);
  white-space: nowrap;
}

/* ─── Conference Grid ───────────────────────────────────────────────────────── */
.conference-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

/* ─── Conference Card ───────────────────────────────────────────────────────── */
.conf-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s, transform 0.2s;
}

.conf-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.conf-card-header {
  padding: 1rem 1.1rem 0.75rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.conf-card-meta {
  flex: 1;
  min-width: 0;
}

.conf-card-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.3;
  margin-bottom: 0.35rem;
}

.conf-card-dates {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.2rem;
}

.conf-card-location {
  font-size: 0.82rem;
  color: var(--gray-500);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.conf-card-body {
  padding: 0 1.1rem 0.75rem;
  flex: 1;
}

.conf-card-description {
  font-size: 0.875rem;
  color: var(--gray-600);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.conf-card-footer {
  padding: 0.75rem 1.1rem;
  border-top: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

/* ─── Badges ────────────────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.badge-category { background: var(--primary-light); color: var(--primary-dark); }
.badge-pending  { background: var(--warning-light); color: var(--warning); }
.badge-approved { background: var(--success-light); color: var(--success); }
.badge-rejected { background: var(--danger-light);  color: var(--danger); }

/* Category color variants */
.badge[data-cat="Higher Education"]  { background: #ede9fe; color: #5b21b6; }
.badge[data-cat="EdTech"]            { background: #dbeafe; color: #1d4ed8; }
.badge[data-cat="Digital Marketing"] { background: #fce7f3; color: #9d174d; }
.badge[data-cat="SEO/SEM"]           { background: #d1fae5; color: #065f46; }
.badge[data-cat="Content Marketing"] { background: #fff7ed; color: #c2410c; }
.badge[data-cat="Online Learning"]   { background: #e0f2fe; color: #0369a1; }
.badge[data-cat="Creator Economy"]   { background: #fef9c3; color: #854d0e; }

/* ─── Buttons ───────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s, transform 0.1s;
  white-space: nowrap;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); text-decoration: none; }

.btn-secondary {
  background: white;
  color: var(--gray-700);
  border-color: var(--gray-300);
}
.btn-secondary:hover { background: var(--gray-50); border-color: var(--gray-400); text-decoration: none; }

.btn-success {
  background: var(--success);
  color: white;
  border-color: var(--success);
}
.btn-success:hover { background: #047857; text-decoration: none; }

.btn-danger {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}
.btn-danger:hover { background: #b91c1c; text-decoration: none; }

.btn-warning {
  background: var(--warning);
  color: white;
  border-color: var(--warning);
}
.btn-warning:hover { background: #b45309; text-decoration: none; }

.btn-sm { padding: 0.3rem 0.75rem; font-size: 0.8rem; }
.btn-lg { padding: 0.7rem 1.5rem; font-size: 1rem; }
.btn-block { width: 100%; justify-content: center; }

/* ─── Forms ─────────────────────────────────────────────────────────────────── */
.form-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 2rem;
  max-width: 680px;
  margin: 0 auto;
}

.form-card h1, .form-card h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.4rem;
}

.form-card .form-subtitle {
  color: var(--gray-500);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.form-section-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-400);
  margin: 1.5rem 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gray-100);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 0.35rem;
}

.form-group label .req {
  color: var(--danger);
  margin-left: 2px;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.9rem;
  color: var(--gray-800);
  background: white;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-group .form-hint {
  font-size: 0.78rem;
  color: var(--gray-400);
  margin-top: 0.25rem;
}

/* ─── Alerts / Messages ─────────────────────────────────────────────────────── */
.alert {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  border: 1px solid transparent;
}

.alert-success { background: var(--success-light); color: #065f46; border-color: #6ee7b7; }
.alert-error   { background: var(--danger-light);  color: #991b1b; border-color: #fca5a5; }
.alert-warning { background: var(--warning-light); color: #92400e; border-color: #fcd34d; }
.alert-info    { background: var(--primary-light); color: var(--primary-dark); border-color: #a5b4fc; }

/* ─── Claim Code Display ────────────────────────────────────────────────────── */
.claim-code-box {
  background: var(--gray-900);
  color: #a5f3fc;
  font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-sm);
  text-align: center;
  margin: 0.5rem 0;
  user-select: all;
}

/* ─── Admin Table ───────────────────────────────────────────────────────────── */
.admin-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  font-size: 0.875rem;
}

.admin-table th {
  background: var(--gray-50);
  padding: 0.65rem 1rem;
  text-align: left;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray-500);
  border-bottom: 1px solid var(--gray-200);
  white-space: nowrap;
}

.admin-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--gray-100);
  vertical-align: middle;
}

.admin-table tr:last-child td { border-bottom: none; }
.admin-table tr:hover td { background: var(--gray-50); }

.admin-table .td-name { font-weight: 600; color: var(--gray-900); max-width: 220px; }
.admin-table .td-name small { display: block; font-weight: 400; font-size: 0.78rem; color: var(--gray-400); margin-top: 1px; }

.admin-table .actions { display: flex; gap: 0.4rem; align-items: center; flex-wrap: wrap; }

/* ─── Tabs ──────────────────────────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 0.25rem;
  border-bottom: 2px solid var(--gray-200);
  margin-bottom: 1.5rem;
}

.tab-btn {
  padding: 0.6rem 1.1rem;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-500);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.tab-btn:hover { color: var(--gray-700); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }

.tab-count {
  display: inline-block;
  background: var(--gray-200);
  color: var(--gray-600);
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.05rem 0.45rem;
  margin-left: 0.3rem;
}

.tab-btn.active .tab-count { background: var(--primary-light); color: var(--primary); }

/* ─── Stats Strip ───────────────────────────────────────────────────────────── */
.stats-strip {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.stat-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.25rem;
  flex: 1;
  min-width: 100px;
  text-align: center;
}

.stat-card .stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 0.15rem;
}

.stat-card .stat-label {
  font-size: 0.78rem;
  color: var(--gray-500);
  font-weight: 500;
}

/* ─── Modal ─────────────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  backdrop-filter: blur(2px);
}

.modal-overlay.hidden { display: none; }

.modal-box {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 520px;
  padding: 1.75rem;
}

.modal-box h2 { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.3rem; }
.modal-box p  { font-size: 0.9rem; color: var(--gray-500); margin-bottom: 1.25rem; }
.modal-actions { display: flex; gap: 0.75rem; justify-content: flex-end; margin-top: 1.25rem; }

/* ─── Empty State ───────────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--gray-500);
}

.empty-state .empty-icon { font-size: 2.5rem; margin-bottom: 0.75rem; }
.empty-state h3 { font-size: 1.05rem; font-weight: 600; color: var(--gray-700); margin-bottom: 0.35rem; }
.empty-state p  { font-size: 0.875rem; }

/* ─── Footer ────────────────────────────────────────────────────────────────── */
.site-footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 1.5rem 0;
  font-size: 0.85rem;
  text-align: center;
  margin-top: auto;
}

.site-footer a {
  color: var(--gray-300);
}

.site-footer .footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ─── Loading Spinner ───────────────────────────────────────────────────────── */
.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin: 2rem auto;
}

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

.loading-state { text-align: center; padding: 2rem; color: var(--gray-400); font-size: 0.9rem; }

/* ─── Page Header ───────────────────────────────────────────────────────────── */
.page-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--gray-200);
}

.page-header h1 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 0.25rem;
}

.page-header p {
  font-size: 0.9rem;
  color: var(--gray-500);
}

/* ─── Admin Login Screen ────────────────────────────────────────────────────── */
.login-wrap {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

/* ─── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .site-nav .hide-mobile { display: none; }
  .conference-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .filter-bar .filter-count { display: none; }
  .hero h1 { font-size: 1.6rem; }
  .stats-strip .stat-card { min-width: 80px; }
  .admin-table td, .admin-table th { padding: 0.5rem 0.6rem; }
}

@media (max-width: 480px) {
  .site-logo .logo-text { font-size: 1rem; }
  .form-card { padding: 1.25rem; }
}

/* ─── Justify page nav active state ────────────────────────────────────────── */
@media (max-width: 640px) {
  .justify-layout { grid-template-columns: 1fr; }
}

/* ─── Past Conference Styling ───────────────────────────────────────────────── */
.conf-card-past {
  opacity: 0.55;
  position: relative;
  background: var(--gray-100);
}
.conf-card-past:hover {
  opacity: 0.7;
  transform: none;
  box-shadow: var(--shadow);
}
.conf-card-past .conf-date-badge {
  background: var(--gray-200);
}
.conf-date-badge-past .dmonth,
.conf-date-badge-past .dday {
  color: var(--gray-400);
}
.conf-card-name-past {
  text-decoration: line-through;
  text-decoration-color: var(--gray-400);
  color: var(--gray-500) !important;
}
.past-badge {
  position: absolute;
  top: 0.6rem;
  right: 0.7rem;
  background: var(--gray-400);
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.15rem 0.55rem;
  border-radius: 20px;
  pointer-events: none;
}

/* ─── Sponsor Cards ─────────────────────────────────────────────────────────── */
.sponsor-card {
  width: 100%;
  margin: 1.5rem 0;
  border-radius: var(--radius);
  overflow: hidden;
}

/* Empty slot */
.sponsor-card-empty {
  border: 2px dashed var(--gray-300);
  background: var(--gray-50);
  transition: border-color 0.15s, background 0.15s;
}
.sponsor-card-empty:hover { border-color: var(--primary); background: var(--primary-light); }

.sponsor-card-empty-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  text-decoration: none;
  color: var(--gray-700);
  flex-wrap: wrap;
}
.sponsor-card-empty:hover .sponsor-card-empty-inner { text-decoration: none; }

.sponsor-empty-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.sponsor-empty-text {
  flex: 1;
  min-width: 0;
}
.sponsor-empty-text strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--gray-800);
}
.sponsor-empty-text span {
  font-size: 0.8rem;
  color: var(--gray-500);
}

/* Filled slot */
.sponsor-card-filled {
  border: 1px solid var(--gray-200);
  background: white;
  box-shadow: var(--shadow-md);
}

.sponsor-card-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  flex-wrap: wrap;
}

.sponsor-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: 6px;
  flex-shrink: 0;
}
.sponsor-logo-placeholder {
  width: 36px;
  height: 36px;
  background: var(--primary-light);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.sponsor-card-text { flex: 1; min-width: 0; }
.sponsor-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-400);
  margin-bottom: 0.1rem;
}
.sponsor-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--gray-900);
}
.sponsor-tagline {
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-top: 0.1rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sponsor-cta {
  flex-shrink: 0;
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid transparent;
}
.sponsor-cta:hover { background: var(--primary); color: white; text-decoration: none; }

/* ─── Print (letter only) ───────────────────────────────────────────────────── */
@media print {
  .site-header, .hero, .site-footer, .letter-actions, .form-panel,
  .filter-bar, .filter-bar *, nav { display: none !important; }
  main { padding: 0 !important; }
  .container { max-width: 100% !important; padding: 0 !important; }
  .justify-layout { display: block !important; }
  .letter-panel { position: static !important; }
  .letter-preview {
    border: none !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    padding: 0 !important;
    font-size: 12pt !important;
    line-height: 1.7 !important;
    min-height: unset !important;
  }
}