/* =========================================================================
   Liquid-glass design system — shared by the public page, admin and login.
   Frosted translucent panels (backdrop blur + saturation) floating over a
   slowly drifting colour field, with specular edge highlights. Light and
   dark modes follow the OS setting.
   ========================================================================= */

:root {
  --text: #0f172a;
  --muted: rgba(15, 23, 42, 0.62);
  --faint: rgba(15, 23, 42, 0.42);
  --accent: #e4002b;
  --green: #16a34a;
  --danger: #b91c1c;

  --base: #eef1f6;
  --blob-1: #ff5c7a;
  --blob-2: #4f8dff;
  --blob-3: #34d399;
  --blob-opacity: 0.55;

  --glass: rgba(255, 255, 255, 0.46);
  --glass-strong: rgba(255, 255, 255, 0.62);
  --glass-border: rgba(255, 255, 255, 0.7);
  --glass-inner: rgba(255, 255, 255, 0.85);
  --glass-shadow: 0 10px 30px rgba(15, 23, 42, 0.10), 0 1px 2px rgba(15, 23, 42, 0.06);
  --control: rgba(255, 255, 255, 0.55);
  --control-border: rgba(255, 255, 255, 0.8);
  --row-line: rgba(15, 23, 42, 0.08);
  --chart-grid: rgba(15, 23, 42, 0.08);
  --chart-text: rgba(15, 23, 42, 0.7);
  --tooltip-bg: rgba(15, 23, 42, 0.85);

  --radius: 22px;
  --radius-sm: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f1f5f9;
    --muted: rgba(241, 245, 249, 0.66);
    --faint: rgba(241, 245, 249, 0.45);
    --green: #4ade80;
    --danger: #fca5a5;

    --base: #0a0f1e;
    --blob-1: #ff3d64;
    --blob-2: #3b6dff;
    --blob-3: #10b981;
    --blob-opacity: 0.38;

    --glass: rgba(255, 255, 255, 0.075);
    --glass-strong: rgba(255, 255, 255, 0.11);
    --glass-border: rgba(255, 255, 255, 0.16);
    --glass-inner: rgba(255, 255, 255, 0.28);
    --glass-shadow: 0 14px 40px rgba(0, 0, 0, 0.45), 0 1px 0 rgba(255, 255, 255, 0.04);
    --control: rgba(255, 255, 255, 0.09);
    --control-border: rgba(255, 255, 255, 0.18);
    --row-line: rgba(255, 255, 255, 0.08);
    --chart-grid: rgba(255, 255, 255, 0.09);
    --chart-text: rgba(241, 245, 249, 0.72);
    --tooltip-bg: rgba(15, 23, 42, 0.92);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  margin: 0;
  color: var(--text);
  background: var(--base);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }

/* ---- drifting colour field behind the glass -------------------------------- */
.bg { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.bg i {
  position: absolute; display: block; border-radius: 50%;
  filter: blur(70px); opacity: var(--blob-opacity);
  will-change: transform;
  animation: drift 26s ease-in-out infinite alternate;
}
.bg i:nth-child(1) { width: 58vmax; height: 58vmax; left: -14vmax; top: -18vmax; background: var(--blob-1); }
.bg i:nth-child(2) { width: 52vmax; height: 52vmax; right: -16vmax; top: 6vmax; background: var(--blob-2); animation-duration: 32s; animation-delay: -8s; }
.bg i:nth-child(3) { width: 48vmax; height: 48vmax; left: 18vmax; bottom: -24vmax; background: var(--blob-3); animation-duration: 38s; animation-delay: -16s; }
@keyframes drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(6vmax, 4vmax, 0) scale(1.12); }
}
@media (prefers-reduced-motion: reduce) { .bg i { animation: none; } }

/* ---- the glass material ------------------------------------------------------ */
.glass {
  position: relative;
  background: var(--glass);
  -webkit-backdrop-filter: blur(28px) saturate(170%);
  backdrop-filter: blur(28px) saturate(170%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--glass-shadow), inset 0 1px 0 var(--glass-inner);
  overflow: hidden;
}
/* specular highlight sweeping the top edge */
.glass::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; border-radius: inherit;
  background:
    radial-gradient(120% 60% at 12% -10%, rgba(255, 255, 255, 0.55), transparent 60%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.18), transparent 38%);
  mix-blend-mode: soft-light;
}
@media (prefers-color-scheme: dark) { .glass::before { opacity: 0.6; } }
/* browsers without backdrop-filter get a more opaque panel so text stays readable */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass { background: var(--glass-strong); }
}

/* ---- layout & type ----------------------------------------------------------- */
.wrap { max-width: 1040px; margin: 0 auto; padding: 32px 20px 44px; }
header h1, .topbar h1 { font-size: 26px; margin: 0 0 4px; letter-spacing: -0.3px; font-weight: 700; }
.sub { color: var(--muted); font-size: 14px; margin: 0 0 22px; line-height: 1.45; }
.sub a { color: var(--muted); }
h2 { font-size: 15px; margin: 26px 0 10px; color: var(--muted); font-weight: 600; letter-spacing: .01em; }
.panel-head h2 { margin: 0; color: var(--text); font-size: 16px; }

/* ---- pill controls ------------------------------------------------------------- */
button, .btn, select, input[type="text"], input[type="password"] {
  font: inherit; font-size: 13px; color: var(--text);
  background: var(--control);
  border: 1px solid var(--control-border);
  border-radius: 999px;
  padding: 9px 16px;
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55), 0 2px 8px rgba(15, 23, 42, 0.06);
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
@media (prefers-color-scheme: dark) {
  button, .btn, select, input[type="text"], input[type="password"] { box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), 0 2px 8px rgba(0, 0, 0, 0.3); }
}
button { cursor: pointer; font-weight: 600; }
button.primary, button[type="submit"]:not(.secondary) {
  color: #fff; border-color: transparent;
  background: linear-gradient(135deg, rgba(228, 0, 43, 0.95), rgba(255, 92, 122, 0.95));
  box-shadow: 0 6px 18px rgba(228, 0, 43, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}
button.secondary { font-weight: 600; }
button:hover { transform: translateY(-1px); }
button:active { transform: translateY(0); }
button:disabled { opacity: 0.5; cursor: default; transform: none; }
select { padding-right: 34px; appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path d='M1 1l5 5 5-5' fill='none' stroke='%2364748b' stroke-width='1.8' stroke-linecap='round'/></svg>");
  background-repeat: no-repeat; background-position: right 14px center; max-width: 100%; }
select option, select optgroup { color: #0f172a; background: #fff; }
input[type="text"], input[type="password"] { width: 100%; border-radius: 14px; padding: 11px 14px; font-size: 15px; }
input:focus, select:focus, button:focus-visible { outline: 2px solid rgba(79, 141, 255, 0.55); outline-offset: 2px; }

/* ---- PUBLIC PAGE ------------------------------------------------------------- */
.tabs { display: inline-flex; gap: 4px; padding: 5px; border-radius: 999px; margin: -6px 0 22px; }
.tabs[hidden] { display: none; }
.tabs .tab { background: transparent; border: 1px solid transparent; box-shadow: none; -webkit-backdrop-filter: none; backdrop-filter: none; padding: 8px 16px; color: var(--muted); font-weight: 600; }
.tabs .tab:hover { transform: none; color: var(--text); }
.tabs .tab.active { background: var(--glass-strong); border-color: var(--glass-border); color: var(--text); box-shadow: 0 2px 8px rgba(15, 23, 42, 0.08), inset 0 1px 0 var(--glass-inner); }
@media (prefers-color-scheme: dark) { .tabs .tab.active { box-shadow: 0 2px 8px rgba(0, 0, 0, 0.35), inset 0 1px 0 var(--glass-inner); } }
.top3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 720px) { .top3 { grid-template-columns: 1fr; } }
.best { padding: 20px 20px 18px; display: flex; flex-direction: column; gap: 6px; transition: transform .2s ease, box-shadow .2s ease; }
.best:hover { transform: translateY(-2px); }
.best.first { border-color: rgba(22, 163, 74, 0.55); box-shadow: var(--glass-shadow), inset 0 1px 0 var(--glass-inner), 0 0 0 1px rgba(22, 163, 74, 0.25); }
.best .rank { position: absolute; top: 14px; right: 16px; font-size: 11px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
  color: var(--muted); background: var(--control); border: 1px solid var(--control-border); border-radius: 999px; padding: 4px 10px; }
.best.first .rank { color: var(--green); border-color: rgba(22, 163, 74, 0.45); }
.best .retailer { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 600; }
.best .name { font-size: 14px; line-height: 1.35; min-height: 38px; }
.best .name a { text-decoration: none; }
.best .name a:hover { text-decoration: underline; }
.best .ppl { font-size: 34px; font-weight: 800; letter-spacing: -0.8px; margin-top: 4px; font-variant-numeric: tabular-nums; }
.best .ppl small { font-size: 14px; font-weight: 500; color: var(--muted); margin-left: 5px; letter-spacing: 0; }
.best .meta { font-size: 13px; color: var(--muted); }
.best .go { margin-top: 10px; font-size: 13px; }
.best .go a { color: var(--accent); text-decoration: none; font-weight: 600; }
@media (prefers-color-scheme: dark) { .best .go a { color: #ff7a94; } }
.best .go a:hover { text-decoration: underline; }

.panel { padding: 20px; margin-top: 22px; }
.panel-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.chart-wrap { position: relative; height: 380px; }
@media (max-width: 720px) { .chart-wrap { height: 300px; } }
.empty { color: var(--muted); font-size: 14px; padding: 30px 0; text-align: center; }

footer { margin-top: 18px; font-size: 12px; color: var(--faint); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; padding: 0 6px; }
footer a { color: var(--faint); }

/* ---- ADMIN PAGE ---------------------------------------------------------------- */
.sys { padding: 14px 18px; font-size: 13px; display: flex; flex-direction: column; gap: 6px; max-width: 860px; }
.sys .ok { color: var(--green); } .sys .warn { color: #d97706; } .sys .bad { color: var(--danger); }
.sys .err { color: var(--danger); word-break: break-word; }
.sys code { font-size: 12px; background: var(--control); border: 1px solid var(--control-border); border-radius: 6px; padding: 1px 6px; }
.sys.errors { margin-top: 10px; border-color: rgba(185, 28, 28, 0.35); }
.sys.errors .errors-title { font-weight: 600; color: var(--danger); }
.sys.errors ul { margin: 4px 0 0; padding-left: 18px; display: flex; flex-direction: column; gap: 6px; }
.sys.errors li { word-break: break-word; line-height: 1.4; }
.sys.errors li.warn-item { color: var(--muted); }
.topbar { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.toolbar { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }
#status { font-size: 13px; color: var(--muted); }
.controls { margin: 10px 0 0; font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 8px; }

.cards { display: flex; flex-wrap: wrap; gap: 14px; }
.card { padding: 16px 18px; width: 224px; }
.card .rank { position: absolute; top: 12px; right: 14px; font-size: 11px; color: var(--faint); font-weight: 700; }
.card .retailer { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 600; }
.card .name { font-size: 13px; margin-top: 4px; min-height: 34px; line-height: 1.3; }
.card .name a { text-decoration: none; }
.card .name a:hover { text-decoration: underline; }
.card .price { font-size: 24px; font-weight: 800; margin-top: 8px; letter-spacing: -0.5px; font-variant-numeric: tabular-nums; }
.card .total { font-size: 12px; color: var(--muted); }
.card .status-error { color: var(--danger); font-size: 12px; margin-top: 6px; word-break: break-word; }
.card .time { font-size: 11px; color: var(--faint); margin-top: 8px; }
.card.cheapest { border-color: rgba(22, 163, 74, 0.55); box-shadow: var(--glass-shadow), inset 0 1px 0 var(--glass-inner), 0 0 0 1px rgba(22, 163, 74, 0.25); }

.table-wrap { padding: 4px 0; max-width: 860px; }
table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; padding: 10px 16px; font-size: 13px; border-bottom: 1px solid var(--row-line); }
th { color: var(--muted); font-weight: 600; font-size: 12px; letter-spacing: .03em; text-transform: uppercase; }
td a { text-decoration: none; }
td a:hover { text-decoration: underline; }
td.price { font-weight: 700; font-variant-numeric: tabular-nums; }
td.error { color: var(--danger); font-size: 12px; }
tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: rgba(255, 255, 255, 0.18); }
@media (prefers-color-scheme: dark) { tbody tr:hover td { background: rgba(255, 255, 255, 0.04); } }

/* ---- LOGIN PAGE ------------------------------------------------------------------ */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; }
.login { width: 100%; max-width: 380px; padding: 30px 28px 24px; }
.login h1 { font-size: 20px; margin: 0 0 4px; }
.login label { display: block; font-size: 12px; color: var(--muted); margin: 14px 0 6px; font-weight: 600; letter-spacing: .03em; text-transform: uppercase; }
.login button { width: 100%; margin-top: 20px; padding: 12px 16px; font-size: 14px; border-radius: 14px; }
.login .error { background: rgba(185, 28, 28, 0.10); color: var(--danger); border: 1px solid rgba(185, 28, 28, 0.25); border-radius: 12px; padding: 10px 12px; font-size: 13px; margin-bottom: 4px; }
.login .error:empty { display: none; }
.login .notice { background: rgba(22, 163, 74, 0.10); color: var(--green); border: 1px solid rgba(22, 163, 74, 0.25); border-radius: 12px; padding: 10px 12px; font-size: 13px; margin-bottom: 4px; }
.login .notice:empty { display: none; }
.login .foot { margin-top: 16px; font-size: 12px; color: var(--faint); text-align: center; }
.login .foot a { color: var(--faint); }