:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --border: #e4e4e7;
  --border-strong: #18181b;
  --text: #09090b;
  --muted: #71717a;
  --danger: #dc2626;
  --success: #16a34a;
}

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

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

.hidden {
  display: none !important;
}

.mono {
  font-family: 'JetBrains Mono', monospace;
}

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 30;
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-badge {
  background: var(--text);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  padding: 0.25rem 0.55rem;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.75rem 1.2rem;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn:hover:not(:disabled) {
  background: #f4f4f5;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--text);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: #27272a;
}

.btn-success {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}

.btn-success:hover:not(:disabled) {
  background: #15803d;
}

.btn-danger {
  border-color: #fecaca;
  color: var(--danger);
  padding: 0.45rem 0.75rem;
}

.btn-danger:hover:not(:disabled) {
  background: #fef2f2;
  border-color: var(--danger);
}

.btn-sm {
  padding: 0.45rem 0.75rem;
  font-size: 0.7rem;
}

/* Login Card */
.login-card {
  max-width: 440px;
  margin: 4rem auto;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 2.25rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.04);
}

.eyebrow {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.login-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.login-subtitle {
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.field {
  margin-bottom: 1.1rem;
}

.field label {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 0.4rem;
}

.input,
select {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--border);
  background: #fff;
  font-family: inherit;
  font-size: 0.92rem;
  color: var(--text);
  outline: none;
}

.input:focus,
select:focus {
  border-color: var(--border-strong);
}

.security-note {
  margin-top: 1.25rem;
  padding: 0.75rem;
  background: #f4f4f5;
  border-left: 3px solid var(--border-strong);
  font-size: 0.78rem;
  color: var(--muted);
}

/* Toolbar & Unsaved Banner */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.unsaved-banner {
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  background: #fffbeb;
  border: 1px solid #fde68a;
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}

.unsaved-banner.visible {
  display: flex;
}

.filter-bar {
  margin-bottom: 1rem;
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.concerts-count {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--muted);
}

/* Concerts List */
.concerts-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.concert-row {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1rem 1.25rem;
  display: grid;
  grid-template-columns: 140px 1.2fr 1.2fr auto;
  align-items: center;
  gap: 1rem;
}

.concert-row.past {
  opacity: 0.6;
  background: #f9fafb;
}

.concert-row.is-new {
  border-color: #86efac;
  border-left: 4px solid #16a34a;
  background: #f0fdf4;
  opacity: 1;
}

.concert-row.is-modified {
  border-color: #fcd34d;
  border-left: 4px solid #d97706;
  background: #fffbeb;
  opacity: 1;
}

.concert-row.is-deleted {
  border-color: #fca5a5;
  border-left: 4px solid #dc2626;
  background: #fef2f2;
  opacity: 0.85;
}

.concert-row.is-deleted .row-main-text {
  text-decoration: line-through;
  color: var(--muted);
}

@media (max-width: 820px) {
  .concert-row {
    grid-template-columns: 1fr;
    gap: 0.6rem;
  }
}

.badge {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--border);
  background: #f4f4f5;
}

.badge-new {
  background: #dcfce7;
  border-color: #86efac;
  color: #166534;
  font-weight: 600;
}

.badge-modified {
  background: #fef3c7;
  border-color: #fcd34d;
  color: #92400e;
  font-weight: 600;
}

.badge-deleted {
  background: #fee2e2;
  border-color: #fca5a5;
  color: #991b1b;
  font-weight: 600;
}

/* Modal */
.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(9, 9, 11, 0.55);
  z-index: 50;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-backdrop.open {
  display: flex;
}

.modal {
  background: var(--surface);
  border: 1px solid var(--border-strong);
  width: 100%;
  max-width: 640px;
  max-height: 92vh;
  overflow-y: auto;
  padding: 1.75rem;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
}

@media (max-width: 600px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

.status-toast {
  display: none;
  margin-bottom: 1.25rem;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--border);
  font-size: 0.88rem;
}

.status-toast.error {
  display: block;
  background: #fef2f2;
  border-color: #fecaca;
  color: #991b1b;
}

.status-toast.ok {
  display: block;
  background: #f0fdf4;
  border-color: #bbf7d0;
  color: #166534;
}