:root {
  color-scheme: light;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
    sans-serif;
  --bg: #f5f6fa;
  --card: #fff;
  --border: #e1e5ee;
  --text: #1c1f2b;
  --muted: #616578;
  --accent: #5468ff;
  --accent-soft: rgba(84, 104, 255, 0.12);
  --warning: #c75050;
  --success: #1f8c5b;
}

body.theme-dark {
  color-scheme: dark;
  --bg: #0c1220;
  --card: #161d31;
  --border: #232c45;
  --text: #f4f6ff;
  --muted: #a7b4d6;
  --accent: #8da5ff;
  --accent-soft: rgba(141, 165, 255, 0.18);
  --warning: #f28b82;
  --success: #4adba8;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.app-shell {
  padding: 2rem;
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}

.page-header h1 {
  margin: 0 0 0.25rem 0;
  font-size: 1.75rem;
}

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

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  padding: 0.4rem 0.9rem;
  background: var(--card);
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease,
    color 0.2s ease, box-shadow 0.2s ease;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  outline: none;
}

.theme-toggle-icon {
  font-size: 1rem;
  line-height: 1;
}

.status-pill {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
}

.card {
  background: var(--card);
  border-radius: 16px;
  border: 1px solid var(--border);
  padding: 1.5rem;
  box-shadow: 0 12px 30px rgba(18, 24, 40, 0.04);
}

.input-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.field-label {
  font-weight: 600;
  margin-bottom: 0.25rem;
  display: inline-block;
}

.time-input {
  width: 100%;
  font-size: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.time-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.field-help {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.suggestion-list {
  display: none;
  margin: 0.5rem 0 0 0;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.12);
}

.suggestion-list.visible {
  display: block;
}

.suggestion-item {
  list-style: none;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.suggestion-item:last-child {
  border-bottom: none;
}

.suggestion-item.active {
  background: var(--accent-soft);
  border-color: transparent;
}

.suggestion-label {
  font-weight: 600;
}

.suggestion-code {
  font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  font-size: 0.9rem;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.suggestion-hint {
  font-style: italic;
}

.syntax-tip {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  border: 1px dashed var(--border);
  background: var(--bg);
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.4;
}

.output-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.copy-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 0.5rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.copy-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.copy-btn:not(:disabled):hover {
  transform: translateY(-1px);
}

.output-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.snippet-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  gap: 1rem;
}

.snippet-row.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.snippet-info {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
}

.snippet-label {
  font-weight: 600;
  color: var(--text);
}

.snippet-code {
  font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  font-size: 0.95rem;
  color: var(--muted);
  word-break: break-all;
}

.snippet-preview {
  font-size: 0.9rem;
  color: var(--muted);
}

.copy-feedback {
  margin: 0;
  font-size: 0.9rem;
  color: var(--success);
  min-height: 1.2em;
}

.warning-text {
  margin: 0;
  font-size: 0.9rem;
  color: var(--warning);
  min-height: 1.2em;
}

.error-text {
  margin: 0;
  font-size: 0.9rem;
  color: var(--warning);
  min-height: 1.2em;
}

.preview-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.settings-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.setting-block {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.settings-select {
  width: 100%;
  padding: 0.75rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  font-size: 1rem;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.timezone-label {
  font-size: 0.9rem;
  color: var(--muted);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: var(--bg);
}

.preview-text {
  margin: 0;
  font-size: 1.05rem;
}

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

.page-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 720px) {
  .app-shell {
    padding: 1.25rem;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .field-group {
    flex-direction: column;
  }
}