/* ===== Variables ===== */
:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface-elevated: #243044;
  --border: #2d3d52;
  --text: #e8edf4;
  --text-muted: #8b9cb3;
  --accent: #10b981;
  --accent-dim: #059669;
  --accent-glow: rgba(16, 185, 129, 0.25);
  --driver: #3b82f6;
  --driver-dim: #2563eb;
  --student: #f59e0b;
  --student-dim: #d97706;
  --danger: #ef4444;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  --font: 'Outfit', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* ===== Layout ===== */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Header ===== */
.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--text);
}
.logo span { color: var(--accent); }

.nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.nav-btn {
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.nav-btn:hover {
  background: var(--surface-elevated);
  color: var(--text);
  border-color: var(--text-muted);
}
.nav-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

.header-user {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-right: 0.5rem;
}

.btn-sm {
  font-size: 0.85rem;
  padding: 0.4rem 0.75rem;
}

/* ===== Main content ===== */
.main {
  flex: 1;
  padding: 2rem 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

.hero {
  text-align: center;
  margin-bottom: 2.5rem;
}
.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
  color: var(--text);
}
.hero p {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* ===== Sections ===== */
.section {
  margin-bottom: 2rem;
}
.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.section-title .badge {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  background: var(--surface-elevated);
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ===== Events grid ===== */
.events-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.event-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.event-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), var(--shadow);
}
.event-card-link {
  cursor: pointer;
  position: relative;
}
.event-card-link:hover .event-card-hint,
.event-card-link:focus .event-card-hint {
  opacity: 1;
}
.event-card-hint {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--accent);
  opacity: 0.7;
  transition: opacity 0.2s;
}
.event-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}
.event-card .meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ===== Calendar ===== */
.calendar-and-list {
  display: grid;
  grid-template-columns: 1fr minmax(220px, 320px);
  gap: 1.5rem;
  align-items: start;
}
@media (max-width: 800px) {
  .calendar-and-list {
    grid-template-columns: 1fr;
  }
}

.calendar-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.calendar-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.calendar-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}

.calendar {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.calendar-weekhead {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
  margin-bottom: 4px;
}

.calendar-weekday {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  text-align: center;
  padding: 0.35rem 0;
}

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

.calendar-day {
  min-height: 4.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.4rem;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.calendar-day-other {
  background: var(--surface-elevated);
  opacity: 0.6;
}

.calendar-day-num {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
  font-family: var(--font-mono);
}

.calendar-day-events {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-height: 0;
  overflow: auto;
}

.calendar-event {
  font-family: var(--font);
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.25rem 0.4rem;
  border: none;
  border-radius: 4px;
  background: var(--accent);
  color: var(--bg);
  cursor: pointer;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background 0.2s;
}

.calendar-event:hover {
  background: var(--accent-dim);
}

.calendar-event:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent-glow);
}

@media (max-width: 600px) {
  .calendar-day-num { font-size: 0.75rem; }
  .calendar-event { font-size: 0.65rem; padding: 0.2rem 0.35rem; }
  .calendar-day { min-height: 3.5rem; }
}

.event-list-sidebar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  position: sticky;
  top: 1rem;
}

.event-list-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.25rem 0;
  color: var(--text);
}

.event-list-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.event-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.event-list li {
  margin-bottom: 2px;
}

.event-list-item {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  width: 100%;
  font-family: var(--font);
  font-size: 0.9rem;
  text-align: left;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.event-list-item:hover {
  background: var(--surface-elevated);
  border-color: var(--accent);
}

.event-list-name {
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.event-list-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.event-list-empty {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 0.75rem 0;
}

/* ===== Forms ===== */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.panel.driver { border-top: 3px solid var(--driver); }
.panel.student { border-top: 3px solid var(--student); }
.panel-event { border-top: 3px solid var(--accent); }

.duplicate-prompt {
  margin-top: 1rem;
  border-color: var(--student);
  border-top: 3px solid var(--student);
}
.duplicate-prompt-text {
  font-weight: 500;
  margin-bottom: 0.75rem;
  color: var(--text);
}
.duplicate-prompt-event {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 1rem;
  padding: 0.75rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.duplicate-prompt-event .meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}
.duplicate-prompt-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.section-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 500px) {
  .form-row { grid-template-columns: 1fr; }
}

.panel h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.panel.driver h3 { color: var(--driver); }
.panel.student h3 { color: var(--student); }

.form-group {
  margin-bottom: 1rem;
}
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}
.form-group input,
.form-group select {
  width: 100%;
  font-family: var(--font);
  font-size: 0.95rem;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
.form-group input::placeholder {
  color: var(--text-muted);
  opacity: 0.8;
}
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.form-group input:focus-visible,
.form-group select:focus-visible,
.nav-btn:focus-visible,
.btn:focus-visible,
.action:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.btn {
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: var(--accent);
  color: var(--bg);
}
.btn-primary:hover {
  background: var(--accent-dim);
  box-shadow: 0 4px 14px var(--accent-glow);
}
.btn-outline {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  background: var(--surface-elevated);
  color: var(--text);
  border-color: var(--text-muted);
}
.btn-driver {
  background: var(--driver);
  color: white;
}
.btn-driver:hover { background: var(--driver-dim); }
.btn-student {
  background: var(--student);
  color: var(--bg);
}
.btn-student:hover { background: var(--student-dim); }

/* ===== Matches / Board ===== */
.matches-section .section-title {
  margin-bottom: 1.25rem;
}

.match-cards {
  display: grid;
  gap: 1rem;
}

.match-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}
@media (max-width: 600px) {
  .match-card { grid-template-columns: 1fr; }
}
.match-card.matched {
  border-color: var(--accent);
  background: linear-gradient(135deg, var(--surface) 0%, rgba(16, 185, 129, 0.06) 100%);
}
.match-card .left h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.match-card .left .detail {
  font-size: 0.9rem;
  color: var(--text-muted);
}
.match-card .right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.match-card .tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.tag.driver { background: rgba(59, 130, 246, 0.2); color: #93c5fd; }
.tag.student { background: rgba(245, 158, 11, 0.2); color: #fcd34d; }
.tag.event { background: var(--surface-elevated); color: var(--text-muted); }
.match-card .action {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
  cursor: pointer;
}
.match-card .action:hover { text-decoration: underline; }

.empty-state {
  text-align: center;
  padding: 2.5rem 1.5rem;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
}
.empty-state p { margin-bottom: 0.5rem; }

/* ===== Event detail page ===== */
.back-link {
  display: inline-block;
  font-size: 0.95rem;
  color: var(--text-muted);
  text-decoration: none;
  margin-bottom: 1.5rem;
  transition: color 0.2s;
}
.back-link:hover {
  color: var(--accent);
}

.event-hero {
  margin-bottom: 2rem;
}
.event-hero h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.event-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.event-signin-required {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}

.event-signin-required p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

.event-signin-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.event-signups {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.5rem;
}
.signup-list h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}
.signup-list ul {
  list-style: none;
}
.signup-list li {
  font-size: 0.95rem;
  padding: 0.25rem 0;
  border-bottom: 1px solid var(--border);
}
.signup-list li:last-child { border-bottom: none; }

/* ===== Auth modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  max-width: 420px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
}

.auth-modal .modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.auth-modal .modal-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
}

.modal-close:hover {
  color: var(--text);
  background: var(--surface-elevated);
}

.auth-form {
  padding: 1.5rem;
}

.auto-assign-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  margin-bottom: 1rem;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: var(--radius);
}
.auto-assign-bar p {
  margin: 0;
  flex: 1;
  font-size: 0.95rem;
}
.auto-assign-success {
  padding: 1rem;
  margin-bottom: 1rem;
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.95rem;
}

.auth-error {
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  background: color-mix(in srgb, var(--error, #dc3545) 15%, transparent);
  border: 1px solid color-mix(in srgb, var(--error, #dc3545) 40%, transparent);
  border-radius: var(--radius);
  color: var(--error, #dc3545);
  font-size: 0.9rem;
}

.time-input-wrap {
  position: relative;
}
.time-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: 0.25rem;
  max-height: 12rem;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  z-index: 100;
  display: none;
}
.time-dropdown.visible {
  display: block;
}
.time-option {
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text);
}
.time-option:hover,
.time-option:focus {
  background: var(--surface-elevated);
}

.auth-form .form-group {
  margin-bottom: 1rem;
}

.auth-form-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.auth-form-actions .btn {
  width: 100%;
}

/* ===== Footer ===== */
.footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}