:root {
  color-scheme: light dark;
  --bg: #f4f5f9;
  --surface: #ffffff;
  --surface-hover: #fafbff;
  --input-bg: #ffffff;
  --border: #e4e7ef;
  --border-strong: #d3d8e3;
  --text: #14161f;
  --muted: #6b7280;
  --accent: #4338ca;
  --accent-hover: #362ea6;
  --accent-soft: rgba(67, 56, 202, 0.09);
  --accent-contrast: #ffffff;
  --danger: #dc2626;
  --danger-soft: rgba(220, 38, 38, 0.1);
  --success: #16a34a;
  --success-soft: rgba(22, 163, 74, 0.1);
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(20, 22, 31, 0.06);
  --shadow-md: 0 12px 28px -12px rgba(20, 22, 31, 0.18), 0 2px 6px -2px rgba(20, 22, 31, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0b0f;
    --surface: #15161d;
    --surface-hover: #1a1c25;
    --input-bg: #191a22;
    --border: #262832;
    --border-strong: #34363f;
    --text: #f1f2f6;
    --muted: #9297a5;
    --accent: #8b83f6;
    --accent-hover: #a49cf9;
    --accent-soft: rgba(139, 131, 246, 0.16);
    --accent-contrast: #0a0b0f;
    --danger: #f87171;
    --danger-soft: rgba(248, 113, 113, 0.13);
    --success: #4ade80;
    --success-soft: rgba(74, 222, 128, 0.13);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 16px 32px -12px rgba(0, 0, 0, 0.55), 0 2px 8px -2px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, system-ui, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

/* ---- Top navigation ---- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.7rem 1.5rem;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar .brand {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}

.topbar nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex-wrap: wrap;
}
.topbar nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  transition: color 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}
.topbar nav a:hover { color: var(--text); background: var(--accent-soft); }

.nav-divider {
  width: 1px;
  height: 20px;
  background: var(--border-strong);
  margin: 0 0.4rem;
}

.nav-cta {
  color: var(--accent-contrast) !important;
  background: var(--accent);
}
.nav-cta:hover { background: var(--accent-hover) !important; color: var(--accent-contrast) !important; }

.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.nav-toggle svg { width: 18px; height: 18px; }

@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .topbar { flex-wrap: wrap; }
  .topbar nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0.15rem;
    order: 3;
    padding-top: 0.6rem;
    margin-top: 0.6rem;
    border-top: 1px solid var(--border);
  }
  .topbar nav.nav-open { display: flex; }
  .topbar nav a { width: 100%; padding: 0.65rem 0.75rem; }
  .nav-divider { display: none; }
}

/* ---- Layout ---- */

main { max-width: 760px; margin: 0 auto; padding: 1.75rem 1.5rem 4rem; }

h1 { font-size: 1.6rem; font-weight: 800; letter-spacing: -0.015em; margin: 0 0 0.3rem; }
h2 { font-size: 1.05rem; font-weight: 700; margin: 0 0 0.75rem; }
.hint { color: var(--muted); font-size: 0.88rem; }
.page-header { margin-bottom: 1.5rem; }

/* ---- Messages ---- */

.messages { list-style: none; margin: 0 0 1.25rem; padding: 0; display: flex; flex-direction: column; gap: 0.5rem; }
.message {
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  border: 1px solid transparent;
  box-shadow: var(--shadow-sm);
}
.message.success { background: var(--success-soft); color: var(--success); border-color: color-mix(in srgb, var(--success) 25%, transparent); }
.message.error { background: var(--danger-soft); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 25%, transparent); }

/* ---- Cards ---- */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.25rem;
}

/* ---- Forms ---- */

.stack { display: flex; flex-direction: column; gap: 1rem; max-width: 380px; }
.stack label { display: flex; flex-direction: column; gap: 0.35rem; font-size: 0.85rem; font-weight: 600; color: var(--muted); }

.layout-bar { margin-bottom: 0.85rem; }
.layout-bar label { display: flex; align-items: center; gap: 0.6rem; font-size: 0.85rem; color: var(--muted); font-weight: 600; }
.layout-bar select { max-width: 240px; }

.search-bar { display: flex; gap: 0.5rem; margin-bottom: 0.85rem; }
.search-bar input { flex: 1; font-size: 1rem; padding: 0.7rem 0.95rem; }

.filters-details {
  margin-bottom: 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.filters-details summary {
  cursor: pointer;
  padding: 0.75rem 1.1rem;
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 700;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.filters-details summary::-webkit-details-marker { display: none; }
.filters-details summary::before {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg);
  transition: transform 0.15s ease;
}
.filters-details[open] summary::before { transform: rotate(45deg); }
.filters-details[open] summary { border-bottom: 1px solid var(--border); }

.filters {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.9rem;
  padding: 1.1rem;
}
.filters label { display: flex; flex-direction: column; gap: 0.35rem; font-size: 0.82rem; color: var(--muted); font-weight: 600; }
.filters .checkbox { flex-direction: row; align-items: center; gap: 0.5rem; }
.filters button { grid-column: 1 / -1; }

input, select, button, textarea {
  font: inherit;
  color: var(--text);
  background: var(--input-bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.7rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible, a:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
input[type="checkbox"] { accent-color: var(--accent); width: auto; padding: 0; }

button {
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
}
button:disabled { opacity: 0.5; cursor: not-allowed; }
button:not(:disabled):hover { background: var(--accent-hover); }

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-strong);
}
.btn-secondary:not(:disabled):hover { background: var(--surface-hover); }

.btn-ghost {
  background: transparent;
  color: var(--danger);
  border: 1px solid transparent;
  padding: 0.35rem 0.6rem;
  font-size: 0.82rem;
}
.btn-ghost:not(:disabled):hover { background: var(--danger-soft); }

/* ---- Badges ---- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 700;
  background: var(--accent-soft);
  color: var(--accent);
  white-space: nowrap;
}
.badge-muted { background: color-mix(in srgb, var(--muted) 14%, transparent); color: var(--muted); }
.badge-gold { background: color-mix(in srgb, #f59e0b 18%, transparent); color: #b45309; }
@media (prefers-color-scheme: dark) { .badge-gold { color: #fbbf24; } }

/* ---- Climb list ---- */

.climb-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.55rem; }
.climb-list li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.climb-list li:has(a):hover { border-color: var(--border-strong); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.climb-list a {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.9rem 1.1rem;
  text-decoration: none;
  color: var(--text);
}
.climb-name { font-weight: 700; font-size: 1rem; }
.climb-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem; color: var(--muted); font-size: 0.82rem; }
.climb-setter { color: var(--muted); font-size: 0.8rem; }
.climb-list .empty { padding: 1.5rem 1.1rem; color: var(--muted); text-align: center; background: transparent; border-style: dashed; box-shadow: none; }
.climb-list .climb-row-fallback { display: flex; flex-direction: column; gap: 0.35rem; padding: 0.9rem 1.1rem; }
.climb-list .row-actions { display: flex; justify-content: flex-end; padding: 0.5rem 1.1rem 0.85rem; }
.climb-list .row-actions form { margin: 0; }

.pager { display: flex; justify-content: space-between; margin-top: 1.25rem; }
.pager a { color: var(--accent); text-decoration: none; font-weight: 700; font-size: 0.9rem; }
.pager a:hover { text-decoration: underline; }

/* ---- Climb detail ---- */

.size-picker { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.25rem; margin-bottom: 1.25rem; box-shadow: var(--shadow-sm); }
.size-options { list-style: none; margin: 0.75rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.size-options a {
  display: inline-block;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.size-options a:hover { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }

.board-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
}
#board-svg { width: 100%; height: auto; display: block; }

.stats-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.stats-table th, .stats-table td { text-align: left; padding: 0.55rem 0.6rem; border-bottom: 1px solid var(--border); }
.stats-table th { color: var(--muted); font-weight: 700; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.03em; }
.stats-table tbody tr:last-child td { border-bottom: none; }
.stats-table tbody tr:hover { background: var(--surface-hover); }

.bluetooth-panel { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
.bluetooth-panel p { margin: 0; }

.actions-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.75rem; }
.actions-grid .stack { max-width: none; }
@media (max-width: 640px) { .actions-grid { grid-template-columns: 1fr; gap: 1.5rem; } }

/* ---- Empty / misc ---- */

.checkmark { color: var(--success); }