:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface2: #263348;
  --border: #334155;
  --accent: #6366f1;
  --accent-lo: rgba(99, 102, 241, 0.1);
  --danger: #f43f5e;
  --danger-lo: rgba(244, 63, 94, 0.1);
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #475569;
  --radius: 14px;
  --radius-sm: 8px;
  --trans: 0.18s ease;
  --nav-h: 56px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f1f5f9;
    --surface: #ffffff;
    --surface2: #f8fafc;
    --border: #e2e8f0;
    --accent: #4f46e5;
    --accent-lo: rgba(79, 70, 229, 0.08);
    --danger: #e11d48;
    --danger-lo: rgba(225, 29, 72, 0.08);
    --text: #0f172a;
    --text-muted: #64748b;
    --text-dim: #94a3b8;
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  -webkit-tap-highlight-color: transparent;
}

/* ── Navbar ───────────────────────────────────────────────────────── */

.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  z-index: 100;
  gap: 1rem;
}

.nav-brand {
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
}

.nav-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--trans), background var(--trans);
  white-space: nowrap;
  font-family: inherit;
}
.nav-btn:hover { color: var(--text); background: var(--accent-lo); }
.nav-btn.active { color: var(--accent); background: var(--accent-lo); }

/* ── Layout ───────────────────────────────────────────────────────── */

main {
  padding-top: calc(var(--nav-h) + 1.25rem);
  padding-bottom: 6rem;
  max-width: 720px;
  margin: 0 auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

.section { display: none; }
.section.active { display: block; }

.section-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin: 1.5rem 0 0.75rem;
}

/* ── Summary cards ────────────────────────────────────────────────── */

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

@media (max-width: 500px) {
  .summary-grid { grid-template-columns: 1fr 1fr; }
  .summary-grid .summary-card:last-child { grid-column: span 2; }
}

.summary-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

.summary-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.summary-value {
  font-size: 1.25rem;
  font-weight: 700;
  word-break: break-word;
}

.currency-note {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 0.375rem;
  line-height: 1.4;
}

/* ── Upcoming ─────────────────────────────────────────────────────── */

.upcoming-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.upcoming-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.625rem 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.625rem;
  flex-wrap: wrap;
}

.upcoming-name { font-weight: 600; flex: 1; min-width: 80px; }
.upcoming-price { font-size: 0.875rem; color: var(--text-muted); }
.upcoming-days { font-size: 0.8rem; font-weight: 600; color: var(--accent); white-space: nowrap; }

.upcoming-item.overdue { border-left-color: var(--danger); }
.upcoming-item.overdue .upcoming-days { color: var(--danger); }

/* ── Filters ──────────────────────────────────────────────────────── */

.filters-bar {
  display: flex;
  gap: 0.5rem;
  margin: 1.25rem 0 0.75rem;
  flex-wrap: wrap;
}

.filters-bar input,
.filters-bar select { width: auto; }

.search-input { flex: 1; min-width: 130px; }

/* ── Subscription cards ───────────────────────────────────────────── */

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

.sub-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left-width: 3px;
  border-radius: var(--radius);
  padding: 1rem;
  transition: opacity var(--trans);
}

.sub-card.inactive { opacity: 0.45; }

.card-title-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.3rem;
}

.card-name { font-weight: 700; font-size: 1rem; }

.card-price {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.375rem;
}

.card-meta { font-size: 0.8125rem; color: var(--text-muted); margin-bottom: 0.25rem; }

.card-date strong { color: var(--text); }
.days-urgent { color: #f43f5e !important; }
.days-soon { color: #f97316 !important; }

.days-hint { color: var(--text-dim); font-size: 0.75rem; }

.card-note {
  font-size: 0.8125rem;
  color: var(--text-dim);
  font-style: italic;
  margin-bottom: 0.25rem;
}

.card-actions {
  display: flex;
  gap: 0.375rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

/* ── Badge ────────────────────────────────────────────────────────── */

.badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 99px;
  white-space: nowrap;
}

/* ── Buttons ──────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: opacity var(--trans), background var(--trans);
  text-decoration: none;
  white-space: nowrap;
  font-family: inherit;
}
.btn:hover { opacity: 0.82; }
.btn:active { opacity: 0.65; }

.btn-primary { background: var(--accent); color: #fff; }
.btn-ghost { background: var(--accent-lo); color: var(--accent); }
.btn-danger { background: var(--danger-lo); color: var(--danger); }
.btn-sm { font-size: 0.8125rem; padding: 0.3rem 0.65rem; }

/* ── FAB ──────────────────────────────────────────────────────────── */

.fab {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 1.75rem;
  line-height: 1;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.45);
  transition: transform var(--trans), box-shadow var(--trans);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
}
.fab:hover { transform: scale(1.08); box-shadow: 0 6px 28px rgba(99, 102, 241, 0.55); }
.fab:active { transform: scale(0.95); }

/* ── Modal ────────────────────────────────────────────────────────── */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
  padding: 1rem;
}
.modal-overlay.hidden { display: none; }

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 480px;
  max-height: 90dvh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.25rem 0;
  gap: 0.5rem;
}

.modal-header h2 { font-size: 1.125rem; font-weight: 700; }

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.25rem 0.375rem;
  border-radius: var(--radius-sm);
  transition: color var(--trans), background var(--trans);
  font-family: inherit;
  flex-shrink: 0;
}
.modal-close:hover { color: var(--text); background: var(--accent-lo); }

#sub-form {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}
@media (max-width: 380px) { .form-row { grid-template-columns: 1fr; } }

.form-group { display: flex; flex-direction: column; gap: 0.375rem; }

label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  display: block;
}

input, textarea, select {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.625rem;
  font-size: 0.9375rem;
  font-family: inherit;
  transition: border-color var(--trans);
  width: 100%;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}

textarea { resize: vertical; min-height: 64px; }

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; }

input[type="date"]::-webkit-calendar-picker-indicator { filter: invert(0.6); cursor: pointer; }
@media (prefers-color-scheme: light) {
  input[type="date"]::-webkit-calendar-picker-indicator { filter: none; }
}

.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea {
  border-color: var(--danger);
}
.form-group.has-error label::after {
  content: ' — povinné';
  color: var(--danger);
  font-size: 0.7rem;
  font-weight: 400;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  padding: 0 1.25rem 1.25rem;
}

/* ── Stats ────────────────────────────────────────────────────────── */

.stats-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
@media (max-width: 400px) { .stats-highlights { grid-template-columns: 1fr; } }

.stat-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.875rem 1rem;
}
.stat-label { font-size: 0.75rem; font-weight: 500; color: var(--text-muted); margin-bottom: 0.25rem; }
.stat-val { font-size: 0.9375rem; font-weight: 700; }
.stat-sub { font-size: 0.75rem; color: var(--text-dim); margin-top: 0.2rem; }

.chart-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1.25rem;
  max-width: 360px;
  margin-left: auto;
  margin-right: auto;
}

.stats-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  margin-bottom: 1rem;
}
.stats-table th {
  text-align: left;
  padding: 0.625rem 0.875rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
}
.stats-table td {
  padding: 0.625rem 0.875rem;
  border-bottom: 1px solid var(--border);
}
.stats-table tr:last-child td { border-bottom: none; }

/* ── Settings ─────────────────────────────────────────────────────── */

.settings-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}
.settings-heading {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.875rem;
}
.settings-actions { display: flex; flex-direction: column; gap: 0.625rem; align-items: flex-start; }

.rates-display { display: flex; flex-direction: column; gap: 0.375rem; margin-bottom: 0.125rem; }
.rate-row { display: flex; align-items: center; gap: 0.75rem; font-size: 0.9375rem; }
.rate-eq { color: var(--text-dim); }
.rate-value { font-weight: 700; color: var(--text); }

/* ── Calendar ─────────────────────────────────────────────────────── */

.cal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0.5rem 0 1rem;
  gap: 0.5rem;
}

.cal-title {
  font-size: 1rem;
  font-weight: 700;
  text-transform: capitalize;
}

.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
  margin-bottom: 0.875rem;
}

.cal-dow {
  text-align: center;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-dim);
  padding: 0.375rem 0 0.25rem;
}

.cal-day {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.3rem;
  min-height: 52px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
}

@media (min-width: 480px) {
  .cal-day { min-height: 68px; padding: 0.4rem; }
}

.cal-day.other-month { opacity: 0.25; }

.cal-day.today { border-color: var(--accent); }
.cal-day.today .cal-day-num { color: var(--accent); font-weight: 700; }

.cal-day-num {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  line-height: 1;
  margin-bottom: 1px;
}

.cal-event {
  font-size: 0.6rem;
  font-weight: 600;
  padding: 1px 3px;
  border-radius: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.5;
}

@media (min-width: 480px) {
  .cal-event { font-size: 0.6875rem; padding: 1px 4px; }
}

.cal-summary {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.875rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.cal-summary strong { color: var(--text); font-size: 1.0625rem; }

/* ── Mobile bottom navigation ─────────────────────────────────────── */

@media (max-width: 540px) {
  :root { --bottom-nav-h: 58px; }

  .navbar { justify-content: center; }

  .nav-links {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-h);
    background: var(--surface);
    border-top: 1px solid var(--border);
    justify-content: space-around;
    align-items: center;
    gap: 0;
    padding: 0 0.25rem;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    z-index: 150;
  }

  .nav-btn {
    flex: 1;
    font-size: 0.6875rem;
    padding: 0.375rem 0.125rem;
    border-radius: var(--radius-sm);
    text-align: center;
  }

  main {
    padding-bottom: calc(var(--bottom-nav-h) + 5rem);
  }

  .fab {
    bottom: calc(var(--bottom-nav-h) + 0.875rem);
  }
}

/* ── Empty state ──────────────────────────────────────────────────── */

.empty-state {
  text-align: center;
  color: var(--text-dim);
  padding: 3rem 1rem;
  font-size: 0.9375rem;
}