/* ── Color tokens ── */
:root {
  --bg-body: #f0f4f8;
  --bg-card: #fff;
  --bg-card-muted: #f8fafc;
  --bg-invite: #f1f5f9;
  --bg-input: #fff;
  --bg-timeline-bar: #e2e8f0;
  --bg-date-avail: #f0f4f8;
  --text-primary: #333;
  --text-heading: #1e3a5f;
  --text-label: #475569;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --text-placeholder: #a0aec0;
  --border-input: #cbd5e1;
  --border-muted: #e2e8f0;
  --border-accent: #3b82f6;
  --border-hover: #94a3b8;
  --bg-success: #ecfdf5;
  --bg-warning: #fffbeb;
  --bg-info: #eff6ff;
  --bg-danger: #fee2e2;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #dc2626;
  --color-danger-muted: #991b1b;
  --color-warning-text: #d97706;
  --btn-secondary-bg: #e2e8f0;
  --btn-secondary-text: #475569;
  --shadow-card: rgba(0,0,0,0.07);
  --shadow-dropdown: rgba(0,0,0,0.1);
  --bg-donation: linear-gradient(135deg,#eff6ff,#f0fdf4);
  --text-donation: #334155;
}

[data-theme="dark"] {
  --bg-body: #0f172a;
  --bg-card: #1e293b;
  --bg-card-muted: #1e293b;
  --bg-invite: #1e293b;
  --bg-input: #1e293b;
  --bg-timeline-bar: #374151;
  --bg-date-avail: #1a2332;
  --text-primary: #e2e8f0;
  --text-heading: #93c5fd;
  --text-label: #94a3b8;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-placeholder: #64748b;
  --border-input: #475569;
  --border-muted: #334155;
  --border-accent: #3b82f6;
  --border-hover: #64748b;
  --bg-success: #064e3b;
  --bg-warning: #451a03;
  --bg-info: #1e3a5f;
  --bg-danger: #450a0a;
  --color-success: #34d399;
  --color-warning: #fbbf24;
  --color-danger: #f87171;
  --color-danger-muted: #fca5a5;
  --color-warning-text: #fbbf24;
  --btn-secondary-bg: #334155;
  --btn-secondary-text: #cbd5e1;
  --shadow-card: rgba(0,0,0,0.3);
  --shadow-dropdown: rgba(0,0,0,0.4);
  --bg-donation: linear-gradient(135deg,#1e293b,#1a2e1a);
  --text-donation: #cbd5e1;
}

/* Dark color-scheme for native widgets */
[data-theme="dark"] input, [data-theme="dark"] select, [data-theme="dark"] textarea { color-scheme: dark; }

/* ── Reset & base ── */
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: system-ui, sans-serif; background: var(--bg-body); color: var(--text-primary); padding: 20px; -webkit-text-size-adjust: 100%; }
.container { max-width: 900px; margin: 0 auto; }
h1 { color: var(--text-heading); font-size: 1.3rem; }
.lang-bar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.lang-select { padding: 5px 8px; border: 1px solid var(--border-input); border-radius: 5px; font-size: 0.8rem; background: var(--bg-input); color: var(--text-label); cursor: pointer; }
.lang-select:hover { border-color: var(--border-hover); }
.subtitle { color: var(--text-secondary); margin-bottom: 20px; }
.card { background: var(--bg-card); border-radius: 10px; padding: 16px; margin-bottom: 16px; box-shadow: 0 2px 6px var(--shadow-card); }
.card h2 { font-size: 1rem; color: var(--text-heading); margin-bottom: 12px; padding-bottom: 6px; border-bottom: 2px solid var(--border-accent); }
.form-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.form-group { display: flex; flex-direction: column; gap: 3px; }
.form-group label { font-size: 0.75rem; font-weight: 600; color: var(--text-label); }
.form-group input, .form-group select { padding: 7px 10px; border: 1px solid var(--border-input); border-radius: 5px; font-size: 0.85rem; background: var(--bg-input); color: var(--text-primary); }
::placeholder { color: var(--text-placeholder); opacity: 1; }
.attendee { background: var(--bg-card-muted); border: 2px solid var(--border-muted); border-radius: 8px; padding: 12px; margin-bottom: 10px; }
.attendee.mandatory { border-color: var(--border-accent); }
.attendee-row { display: flex; gap: 8px; align-items: flex-end; flex-wrap: wrap; }
.attendee-row .form-group { flex: 1; min-width: 80px; }
.attendee-row .tz-picker { flex: 1.6; min-width: 160px; }
.attendee-row .form-group:has(input[type="time"]) { flex: 0.85; min-width: 75px; }
.color-dot { width: 14px; height: 14px; border-radius: 50%; margin-bottom: 8px; }
.checkbox-group { display: flex; align-items: center; gap: 5px; margin-bottom: 8px; font-size: 0.8rem; }
.btn { padding: 8px 14px; border: none; border-radius: 5px; cursor: pointer; font-size: 0.85rem; }
.btn-primary { background: var(--border-accent); color: #fff; }
.btn-secondary { background: var(--btn-secondary-bg); color: var(--btn-secondary-text); }
.btn-success { background: var(--color-success); color: #fff; padding: 10px 24px; font-size: 1rem; }
.btn-sm { padding: 4px 8px; font-size: 0.75rem; }
.btn-danger { background: var(--bg-danger); color: var(--color-danger); }
.remove-btn { background: none; border: none; color: var(--color-danger); cursor: pointer; font-size: 1.1rem; margin-bottom: 8px; }
.center { text-align: center; margin: 20px 0; }
.results { display: none; }
.results.show { display: block; }
.legend { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 12px; padding: 10px; background: var(--bg-card-muted); border-radius: 6px; font-size: 0.8rem; }
.legend-item { display: flex; align-items: center; gap: 5px; }
.legend-color { width: 16px; height: 12px; border-radius: 2px; }
.chart { margin-bottom: 16px; }
.chart-title { font-size: 0.9rem; font-weight: 600; margin-bottom: 8px; }
.timeline-header { display: flex; margin-left: 100px; font-size: 0.65rem; color: var(--text-secondary); }
.timeline-header span { flex: 1; }
.timeline-row { display: flex; align-items: center; margin-bottom: 4px; }
.timeline-label { width: 100px; font-size: 0.75rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.timeline-bar { flex: 1; height: 22px; background: var(--bg-timeline-bar); border-radius: 3px; position: relative; overflow: hidden; }
.timeline-bar .segment { position: absolute; height: 16px; top: 3px; border-radius: 2px; }
.timeline-bar .segment.next-day { opacity: 0.45; background-image: repeating-linear-gradient(90deg,transparent,transparent 3px,rgba(255,255,255,0.4) 3px,rgba(255,255,255,0.4) 6px); overflow: hidden; }
.next-day-label { position: absolute; left: 3px; top: 0; height: 100%; line-height: 16px; font-size: 0.55rem; color: rgba(0,0,0,0.5); font-weight: 700; white-space: nowrap; pointer-events: none; letter-spacing: 0.02em; }
[data-theme="dark"] .next-day-label { color: rgba(255,255,255,0.5); }
.overflow-btn { position: absolute; right: 0; top: 0; height: 22px; width: 18px; background: rgba(0,0,0,0.10); border: none; cursor: pointer; font-size: 0.85rem; font-weight: 700; color: var(--text-heading); border-radius: 0 3px 3px 0; z-index: 2; line-height: 22px; text-align: center; }
.overflow-btn:hover { background: rgba(0,0,0,0.18); }
.result-box { padding: 16px; border-radius: 8px; margin-bottom: 12px; }
.result-box.success { background: var(--bg-success); border: 2px solid var(--color-success); }
.result-box.warning { background: var(--bg-warning); border: 2px solid var(--color-warning); }
.result-box.info { background: var(--bg-info); border: 2px solid var(--border-accent); }
.night-warn { color: var(--color-warning-text); }
.invite-box { background: var(--bg-invite); padding: 12px; border-radius: 6px; font-family: monospace; font-size: 0.8rem; white-space: pre-wrap; margin-top: 12px; color: var(--text-primary); }
.disclaimer { background: var(--bg-warning); padding: 10px; border-left: 3px solid var(--color-warning); margin: 10px 0; font-size: 0.85rem; border-radius: 0 6px 6px 0; }
.date-range-toggle { margin-top: 8px; display: flex; justify-content: flex-end; }
.date-range-inputs { display: none; gap: 12px; flex: 1 1 100%; }
.date-range-inputs.show { display: flex; }
.date-range-inputs .form-group { flex: 1; }
.date-availability { margin-top: 8px; padding: 8px; background: var(--bg-date-avail); border-radius: 6px; }
.date-row { display: flex; flex-direction: column; gap: 4px; padding: 4px 0; transition: opacity 0.15s; }
.date-row-header { display: flex; gap: 8px; align-items: center; }
.date-row-times { display: flex; gap: 8px; align-items: flex-end; padding-left: 32px; }
.date-row + .date-row { border-top: 1px solid var(--border-muted); margin-top: 4px; padding-top: 8px; }
.date-row.disabled { opacity: 0.35; }
.date-row.disabled input[type="time"] { pointer-events: none; }
.date-label { font-size: 0.78rem; font-weight: 600; color: var(--text-label); min-width: 120px; }
.date-toggle-btn { background: none; border: 1px solid var(--border-input); border-radius: 4px; width: 24px; height: 24px; cursor: pointer; font-size: 0.8rem; line-height: 24px; text-align: center; color: var(--text-secondary); padding: 0; }
.date-toggle-btn:hover { background: var(--bg-invite); border-color: var(--border-hover); }
.date-result { margin-bottom: 16px; padding: 12px; background: var(--bg-card-muted); border-radius: 8px; border: 2px solid var(--border-muted); transition: border-color 0.15s; }
.date-result.selectable { cursor: pointer; }
.date-result.selectable:hover { border-color: #93c5fd; }
.date-result.selected { border-color: var(--border-accent); }
.date-result h4 { font-size: 0.9rem; color: var(--text-heading); margin-bottom: 8px; }
.tz-picker { position: relative; }
.tz-input { width: 100%; cursor: text; }
.tz-dropdown { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--bg-card); border: 1px solid var(--border-input); border-radius: 5px; max-height: 200px; overflow-y: auto; z-index: 10; box-shadow: 0 4px 12px var(--shadow-dropdown); margin-top: 2px; }
.tz-dropdown.open { display: block; }
.tz-option { padding: 6px 10px; cursor: pointer; font-size: 0.82rem; display: flex; justify-content: space-between; }
.tz-option:hover, .tz-option.active { background: var(--bg-info); }
.tz-option .tz-city { color: var(--text-heading); }
.tz-option .tz-offset { color: var(--text-secondary); font-size: 0.75rem; }
.tz-section { padding: 4px 10px; font-size: 0.7rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; border-top: 1px solid var(--border-muted); }
.tz-section:first-child { border-top: none; }
.cal-buttons { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.time-list { list-style: none; margin: 10px 0; font-size: 0.85rem; }
.time-list li { padding: 4px 0; }

/* ── Utility classes (extracted from inline styles) ── */
.noscript-box { background: var(--bg-danger); border: 1px solid var(--color-danger); border-radius: 8px; padding: 16px; margin-bottom: 16px; color: var(--color-danger-muted); font-size: 0.9rem; }
.required-mark { color: var(--color-danger); }
.donation-banner { background: var(--bg-donation); border-radius: 10px; padding: 14px 18px; margin-bottom: 16px; font-size: 0.85rem; color: var(--text-donation); box-shadow: 0 1px 4px var(--shadow-card); display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.donation-banner p { margin: 0; line-height: 1.5; flex: 1; min-width: 200px; }
.donation-banner > div { flex-shrink: 0; }
.tz-hint-text { font-weight: 400; color: var(--text-muted); }
.tz-no-matches { padding: 8px 10px; color: var(--text-muted); font-size: 0.82rem; }
.utc-time-line { color: var(--text-secondary); font-size: 0.8em; }
.text-muted-msg { color: var(--text-secondary); }
#meetingDescription { padding: 7px 10px; border: 1px solid var(--border-input); border-radius: 5px; font-size: 0.85rem; font-family: inherit; resize: vertical; background: var(--bg-input); color: var(--text-primary); }
footer { text-align: center; padding: 80px 0 10px; font-size: 0.75rem; color: var(--text-muted); }
footer a { color: var(--text-muted); }

/* ── Theme toggle button ── */
.theme-toggle-btn { background: none; border: 1px solid var(--border-input); border-radius: 5px; padding: 4px 8px; cursor: pointer; font-size: 1rem; line-height: 1; color: var(--text-primary); }
.theme-toggle-btn:hover { border-color: var(--border-hover); }

@media (max-width: 600px) {
  body { padding: 12px; }
  h1 { font-size: 1.15rem; }
  .subtitle { font-size: 0.85rem; margin-bottom: 14px; }
  .card { padding: 12px; }

  /* Meeting Details: stack fields vertically */
  .form-row > .form-group { flex: 1 1 100% !important; }

  /* Attendees: color dot & remove btn pinned to corners */
  .attendee { position: relative; padding-left: 22px; }
  .attendee-row .color-dot { position: absolute; top: 14px; left: 8px; width: 10px; height: 10px; margin: 0; }
  .attendee-row .remove-btn { position: absolute; top: 8px; right: 6px; margin: 0; font-size: 1.3rem; padding: 4px; }
  .attendee-row .form-group { flex: 1 1 100% !important; min-width: 0 !important; }
  .attendee-row .tz-picker { flex: 1 1 100% !important; min-width: 0 !important; }
  .attendee-row .form-group:has(input[type="time"]) { flex: 1 1 40% !important; }
  .attendee-row .checkbox-group { margin-bottom: 0; }

  /* Date-range time rows: less indent on mobile */
  .date-row-times { padding-left: 10px; }

  /* Timeline chart: narrower labels */
  .timeline-label { width: 56px; font-size: 0.65rem; }
  .timeline-header { margin-left: 56px; font-size: 0.5rem; }

  /* Touch-friendly buttons (44px min) */
  .btn { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
  .btn-success { width: 100%; }
  .btn-secondary { width: 100%; }

  /* Calendar action buttons stack vertically */
  .cal-buttons { flex-direction: column; }
  .cal-buttons .btn { width: 100%; justify-content: center; }

  /* Larger touch targets for controls */
  .lang-select { min-height: 36px; font-size: 0.85rem; }
  .checkbox-group input[type="checkbox"] { width: 20px; height: 20px; }
  .date-toggle-btn { width: 32px; height: 32px; font-size: 0.9rem; line-height: 32px; }

  /* Results area */
  .invite-box { font-size: 0.72rem; padding: 10px; }
  .result-box { padding: 12px; }
  .time-list { font-size: 0.8rem; }

  /* Footer */
  footer { padding-top: 40px !important; }
}