:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --border: #dfe3e8;
  --text: #16191d;
  --muted: #5d6670;
  --accent: #1f5eff;
  --accent-hover: #1749cc;
  --accent-soft: #e8efff;
  --danger: #c62828;
  --danger-soft: #fdecec;
  --success: #1b7a3d;
  --success-soft: #e7f5ec;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.08);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --surface: #1a1d22;
    --surface-2: #23272e;
    --border: #2f343c;
    --text: #e8eaed;
    --muted: #9aa2ad;
    --accent: #5b8cff;
    --accent-hover: #7aa2ff;
    --accent-soft: #1d2a47;
    --danger: #ff6b6b;
    --danger-soft: #3a1f22;
    --success: #4cc27a;
    --success-soft: #17301f;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.25; margin: 0; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.05rem; }

.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand { font-weight: 700; color: var(--text); display: flex; align-items: center; gap: 8px; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 22px; height: 22px; border-radius: 5px; background: var(--accent);
  display: inline-grid; place-items: center;
}
.brand-mark::after { content: ""; width: 8px; height: 8px; background: var(--surface); border-radius: 1px; }

main.page { max-width: 1200px; margin: 0 auto; padding: 24px 20px 64px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.card + .card, .grid + .card, .card + .grid { margin-top: 20px; }
.card-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.card-sub { color: var(--muted); font-size: 0.875rem; margin: 4px 0 0; }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-detail { grid-template-columns: 300px 1fr; }
@media (max-width: 860px) { .grid-2, .grid-detail { grid-template-columns: 1fr; } }

label { display: block; font-weight: 600; font-size: 0.875rem; margin-bottom: 6px; }
.field { margin-bottom: 14px; }
.hint { color: var(--muted); font-size: 0.8rem; margin-top: 4px; }
.optional { color: var(--muted); font-weight: 400; }

input[type="text"], input[type="url"], input[type="password"], select {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}
input:focus, select:focus, button:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
input[readonly] { background: var(--surface-2); color: var(--muted); }

.prefixed { display: flex; align-items: stretch; }
.prefixed .prefix {
  padding: 9px 10px; border: 1px solid var(--border); border-right: 0;
  border-radius: 8px 0 0 8px; background: var(--surface-2); color: var(--muted);
  font-size: 0.85rem; white-space: nowrap; max-width: 55%; overflow: hidden; text-overflow: ellipsis;
  display: flex; align-items: center;
}
.prefixed input { border-radius: 0 8px 8px 0; min-width: 0; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 14px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; font-weight: 600; font-size: 0.875rem;
  cursor: pointer; white-space: nowrap; text-decoration: none;
}
.btn:hover { background: var(--surface-2); text-decoration: none; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-danger { color: var(--danger); }
.btn-danger:hover { background: var(--danger-soft); }
.btn-sm { padding: 5px 10px; font-size: 0.8rem; }
.btn-link { border: 0; background: none; padding: 0; color: var(--accent); font-weight: 600; cursor: pointer; font: inherit; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

.alert { padding: 10px 12px; border-radius: 8px; font-size: 0.875rem; margin-top: 12px; }
.alert-error { background: var(--danger-soft); color: var(--danger); }
.alert-success { background: var(--success-soft); color: var(--success); }
.alert-warning { background: #fff6e0; color: #8a5a00; }
@media (prefers-color-scheme: dark) { .alert-warning { background: #3a2f12; color: #f2c46b; } }
.alert ul { margin: 6px 0 0; padding-left: 18px; max-height: 180px; overflow: auto; }

/* File drop */
.dropzone {
  border: 1.5px dashed var(--border); border-radius: var(--radius); padding: 18px; text-align: center;
  color: var(--muted); font-size: 0.875rem; cursor: pointer; transition: border-color .15s, background .15s;
}
.dropzone.dragover, .dropzone:hover { border-color: var(--accent); background: var(--accent-soft); }
.dropzone strong { color: var(--text); }
.dropzone input { display: none; }

/* Table */
.toolbar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 10px 12px; margin-bottom: 12px; border-radius: 8px; background: var(--accent-soft);
}
.toolbar[hidden] { display: none; }
.toolbar .count { font-weight: 600; margin-right: auto; }
.toolbar select { width: auto; padding: 5px 8px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
th { text-align: left; color: var(--muted); font-weight: 600; font-size: 0.75rem; text-transform: uppercase; letter-spacing: .03em; }
th, td { padding: 10px 8px; border-bottom: 1px solid var(--border); vertical-align: middle; }
tbody tr:hover { background: var(--surface-2); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
td.check, th.check { width: 32px; }
.thumb { width: 44px; height: 44px; border-radius: 4px; background: #fff; display: block; border: 1px solid var(--border); }
.code-name { font-weight: 600; color: var(--text); }
.truncate { max-width: 260px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; display: block; }
.short-url { display: inline-flex; align-items: center; gap: 6px; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 0.8rem; }
.muted { color: var(--muted); }
.empty { text-align: center; padding: 40px 20px; color: var(--muted); }

/* Detail page */
.qr-preview { width: 100%; aspect-ratio: 1; background: #fff; border-radius: 8px; border: 1px solid var(--border); display: block; }
.stat-tiles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
@media (max-width: 700px) { .stat-tiles { grid-template-columns: repeat(2, 1fr); } }
.tile { background: var(--surface-2); border-radius: 8px; padding: 12px 14px; }
.tile-label { color: var(--muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: .03em; font-weight: 600; }
.tile-value { font-size: 1.5rem; font-weight: 700; font-variant-numeric: tabular-nums; margin-top: 2px; }
.tile-value.small { font-size: 1rem; padding-top: 6px; }

.chart { width: 100%; height: 200px; display: block; margin-top: 16px; }
.chart .bar { fill: var(--accent); }
.chart .bar:hover { fill: var(--accent-hover); }
.chart .axis { fill: var(--muted); font-size: 11px; }
.chart .gridline { stroke: var(--border); stroke-width: 1; }

.breakdowns { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 20px; }
@media (max-width: 860px) { .breakdowns { grid-template-columns: 1fr; } }
.breakdown h3 { font-size: 0.8rem; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; margin-bottom: 8px; }
.meter-row { display: grid; grid-template-columns: 1fr auto; gap: 2px 8px; font-size: 0.85rem; margin-bottom: 8px; }
.meter { grid-column: 1 / -1; height: 6px; background: var(--surface-2); border-radius: 3px; overflow: hidden; }
.meter > span { display: block; height: 100%; background: var(--accent); border-radius: 3px; }

.back { display: inline-block; margin-bottom: 12px; font-size: 0.875rem; }
.title-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }

/* Toast */
.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 8px;
  font-size: 0.875rem; font-weight: 600; box-shadow: 0 4px 16px rgba(0,0,0,.2); z-index: 10;
}
.toast[hidden] { display: none; }

/* Login + standalone pages */
.center-card {
  max-width: 380px; margin: 12vh auto 0; padding: 28px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
}
.center-card h1 { margin-bottom: 18px; }
.center-card .btn { width: 100%; margin-top: 4px; }