:root {
  --bg: #f5f6f8;
  --panel-bg: #ffffff;
  --text: #1a1d23;
  --text-muted: #5b6270;
  --border: #e1e4ea;
  --accent: #4f46e5;
  --accent-text: #ffffff;
  --danger: #d1435b;
  --future-soon: #e0592a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --panel-bg: #1e2126;
    --text: #eef0f3;
    --text-muted: #9aa2b1;
    --border: #2c3038;
    --accent: #7c72f0;
    --accent-text: #14161a;
    --danger: #ef6b82;
    --future-soon: #f0925a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.page-header {
  padding: 2.5rem 1.5rem 1.5rem;
  text-align: center;
}

.page-header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.9rem;
}

.subtitle {
  margin: 0;
  color: var(--text-muted);
}

.tab-nav {
  max-width: 720px;
  margin: 0 auto 1.5rem;
  padding: 0 1.5rem;
  display: flex;
  gap: 0.5rem;
}

.tab-btn {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

.tab-btn.active {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

.tab-view {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.tab-view[hidden] {
  display: none;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

.panel h2 {
  margin-top: 0;
  font-size: 1.15rem;
}

.hint {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.stack label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

input[type="text"],
input[type="url"],
input[type="datetime-local"] {
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

button {
  align-self: flex-start;
  background: var(--accent);
  color: var(--accent-text);
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

button.secondary {
  background: transparent;
  color: var(--danger);
  padding: 0.3rem 0.5rem;
  font-weight: 500;
}

.form-error {
  color: var(--danger);
  font-size: 0.85rem;
  margin: 0;
}

.input-with-toggle {
  display: flex;
  gap: 0.5rem;
}

.input-with-toggle input {
  flex: 1;
  min-width: 0;
}

.input-with-toggle button {
  align-self: stretch;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
}

.import-list-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.import-list-header h3 {
  margin: 0.5rem 0;
}

.import-select-actions {
  display: flex;
  gap: 0.4rem;
}

.import-select-actions button {
  padding: 0.25rem 0.6rem;
  font-size: 0.82rem;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-weight: 500;
}

.import-list {
  list-style: none;
  margin: 0.5rem 0 1rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.import-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.92rem;
}

.import-list .event-when {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.events-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.event-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.event-info h3 {
  margin: 0 0 0.15rem;
  font-size: 1.05rem;
}

.event-meta {
  color: var(--text-muted);
  font-size: 0.82rem;
}

.category-badge {
  display: inline-block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.08rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
}

.label-optional {
  font-weight: 400;
  color: var(--text-muted);
}

.event-countdown {
  display: flex;
  gap: 0.35rem;
}

.event-countdown.past {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 1.1rem;
}

.countdown-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 2.5rem;
  padding: 0.3rem 0.35rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.countdown-value {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.15;
}

.countdown-label {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.event-countdown.soon .countdown-value {
  color: var(--future-soon);
}

.event-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.4rem;
}

.event-buttons {
  display: flex;
  gap: 0.3rem;
}

.event-buttons button {
  padding: 0.25rem 0.5rem;
  font-size: 0.82rem;
}

.edit-form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
}

.edit-form input {
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
}

.edit-buttons {
  display: flex;
  gap: 0.5rem;
}

.edit-buttons button {
  padding: 0.4rem 0.9rem;
  font-size: 0.88rem;
}

.category-group {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 0.8rem;
  overflow: hidden;
}

.category-group summary {
  padding: 0.8rem 1rem;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.category-group summary::-webkit-details-marker {
  display: none;
}

.category-group summary::before {
  content: "▸";
  display: inline-block;
  margin-right: 0.5rem;
  color: var(--text-muted);
  transition: transform 0.15s ease;
}

.category-group[open] summary::before {
  transform: rotate(90deg);
}

.category-group .category-events {
  padding: 0 1rem 1rem;
}

@media (max-width: 480px) {
  .event-card {
    flex-direction: column;
    align-items: stretch;
  }

  .event-actions {
    align-items: stretch;
  }

  .event-countdown {
    justify-content: flex-start;
  }

  .event-buttons {
    justify-content: flex-end;
  }
}