/* Tire Shopper — dark theme prototype */
:root {
  --bg: #0c0f14;
  --bg-2: #0a0d11;
  --panel: #141a22;
  --panel-2: #1a212b;
  --elev: #1e2630;
  --border: #232c38;
  --border-2: #2e3a48;
  --text: #e7edf4;
  --dim: #9aa7b4;
  --mute: #66727f;
  --accent: #4c8dff;
  --accent-2: #3a72e0;
  --accent-soft: rgba(76, 141, 255, 0.14);
  --ok: #46c06b;
  --warn: #e0a13a;
  --bad: #ef5f52;
  --r: 12px;
  --r-sm: 8px;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: radial-gradient(1200px 600px at 70% -10%, #121a26 0%, var(--bg) 55%) fixed;
  color: var(--text);
  font-size: 14px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent-soft); }

/* ---------- header ---------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 12px;
  height: 56px;
  padding: 0 22px;
  background: rgba(12, 15, 20, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo svg, .logo img { display: block; border-radius: 5px; }
.logo .name { font-weight: 700; font-size: 19.4px; letter-spacing: 0.2px; }
.logo .tag {
  font-size: 10px; text-transform: uppercase; letter-spacing: 1px;
  color: var(--mute); border: 1px solid var(--border-2); border-radius: 999px;
  padding: 2px 8px;
}
.header-spacer { flex: 1; }
.header-note { color: var(--mute); font-size: 12px; }

/* ---------- layout ---------- */
.layout {
  display: grid;
  grid-template-columns: 332px 1fr;
  gap: 22px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 22px;
  align-items: start;
}
.sidebar { position: sticky; top: 78px; display: flex; flex-direction: column; gap: 16px; }
.main { min-width: 0; }

/* ---------- panels & fields ---------- */
.panel {
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 16px;
  box-shadow: var(--shadow);
}
.panel + .panel { margin-top: 0; }
.field { margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }
.field-label {
  display: flex; align-items: baseline; gap: 8px;
  font-weight: 600; font-size: 12.5px; letter-spacing: 0.3px;
  text-transform: uppercase; color: var(--dim);
  margin-bottom: 9px;
}
.hint { font-weight: 400; text-transform: none; letter-spacing: 0; color: var(--mute); font-size: 11.5px; }

/* ---------- inputs ---------- */
.size-input { display: flex; gap: 8px; }
input[type="text"] {
  flex: 1; min-width: 0;
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  color: var(--text);
  border-radius: var(--r-sm);
  padding: 9px 11px;
  font-size: 14px;
  font-family: var(--font);
  transition: border-color 0.15s, box-shadow 0.15s;
}
input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
input[type="text"]::placeholder { color: var(--mute); }
.inline-err { color: var(--bad); font-size: 12px; min-height: 0; margin-top: 6px; }
.inline-err:empty { display: none; }

/* ---------- buttons ---------- */
.btn {
  cursor: pointer; border: 1px solid var(--border-2);
  background: var(--elev); color: var(--text);
  border-radius: var(--r-sm); padding: 9px 13px;
  font-size: 13px; font-weight: 600; font-family: var(--font);
  transition: background 0.15s, border-color 0.15s, transform 0.05s;
}
.btn:hover { border-color: var(--accent); }
.btn:active { transform: translateY(1px); }
.btn-add { background: var(--accent-soft); border-color: transparent; color: #cfe0ff; }
.btn-add:hover { background: rgba(76, 141, 255, 0.24); }
.btn-ghost { width: 100%; background: transparent; color: var(--dim); }
.btn-buy {
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-2) 100%);
  border-color: transparent; color: #fff; padding: 7px 12px; white-space: nowrap;
}
.btn-buy:hover { filter: brightness(1.08); border-color: transparent; }

/* ---------- ordered size list ---------- */
.size-list { list-style: none; margin: 11px 0 0; padding: 0; display: flex; flex-direction: column; gap: 7px; }
.size-empty { color: var(--mute); font-size: 12.5px; font-style: italic; padding: 2px; }
.size-chip {
  display: flex; align-items: center; gap: 9px;
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--r-sm); padding: 6px 8px 6px 6px;
}
.size-chip.mirrored { opacity: 0.6; }
.size-chip .ord {
  flex: none; width: 22px; height: 22px; border-radius: 6px;
  display: grid; place-items: center; font-size: 11px; font-weight: 700;
  background: var(--accent-soft); color: #bcd4ff;
}
.size-chip .sz { flex: 1; font-variant-numeric: tabular-nums; font-weight: 600; letter-spacing: 0.3px; }
.ord-btns { display: flex; flex-direction: column; gap: 1px; }
.ord-btns button, .size-chip .rm {
  cursor: pointer; background: none; border: none; color: var(--mute);
  font-size: 10px; line-height: 1; padding: 2px 4px; border-radius: 4px;
}
.size-chip .rm { font-size: 16px; padding: 0 6px; }
.ord-btns button:hover:not(:disabled), .size-chip .rm:hover { color: var(--text); background: var(--elev); }
.ord-btns button:disabled { opacity: 0.25; cursor: default; }
.size-chip.moved { animation: flashMove 1s ease; }
@keyframes flashMove {
  0%   { background: var(--accent-soft); border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
  80%  { background: var(--accent-soft); border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
  100% { background: var(--bg-2); border-color: var(--border); box-shadow: none; }
}

/* ---------- mirror + toggle ---------- */
.mirror { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--dim); margin-bottom: 10px; cursor: pointer; }
.mirror input { accent-color: var(--accent); }
#rearControls.disabled { opacity: 0.4; pointer-events: none; }

.toggle { display: flex; align-items: center; gap: 11px; cursor: pointer; user-select: none; }
.toggle input { position: absolute; opacity: 0; width: 0; height: 0; }
.toggle .slider {
  position: relative; flex: none; width: 38px; height: 22px; border-radius: 999px;
  background: var(--border-2); transition: background 0.18s;
}
.toggle .slider::before {
  content: ""; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px;
  border-radius: 50%; background: #cdd6df; transition: transform 0.18s;
}
.toggle input:checked + .slider { background: var(--accent); }
.toggle input:checked + .slider::before { transform: translateX(16px); background: #fff; }
.toggle input:focus-visible + .slider { box-shadow: 0 0 0 3px var(--accent-soft); }
.toggle-text { font-size: 13px; color: var(--text); }
.toggle + .toggle { margin-top: 11px; }

/* ---------- facet chips ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 7px; }
.chip {
  cursor: pointer; border: 1px solid var(--border-2); background: var(--bg-2);
  color: var(--dim); border-radius: 999px; padding: 5px 12px; font-size: 12.5px;
  font-weight: 600; font-family: var(--font); transition: all 0.13s;
}
.chip:hover { border-color: var(--accent); color: var(--text); }
.chip.active { background: var(--accent-soft); border-color: var(--accent); color: #cfe0ff; }
.facet-empty { color: var(--mute); font-size: 12.5px; font-style: italic; }

/* ---------- summary bar ---------- */
.summary-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-bottom: 16px; min-height: 22px;
}
.summary { color: var(--dim); font-size: 13.5px; }
.summary strong { color: var(--text); }
.sort { display: flex; align-items: center; gap: 8px; color: var(--mute); font-size: 12.5px; }
.sort select {
  background: var(--panel); color: var(--text); border: 1px solid var(--border-2);
  border-radius: var(--r-sm); padding: 7px 10px; font-size: 13px; font-family: var(--font); cursor: pointer;
}
.sort select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* ---------- result cards ---------- */
.results { display: flex; flex-direction: column; gap: 14px; }
.set-card {
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--r);
  overflow: hidden;
  transition: border-color 0.15s, transform 0.08s;
}
.set-card:hover { border-color: var(--border-2); transform: translateY(-1px); }
.set-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 16px; border-bottom: 1px solid var(--border);
}
.set-badges { display: flex; flex-wrap: wrap; gap: 6px; }
.badge {
  font-size: 11px; font-weight: 700; letter-spacing: 0.2px;
  padding: 3px 9px; border-radius: 999px; border: 1px solid transparent; white-space: nowrap;
}
.b-top { background: var(--accent); color: #fff; }
.b-matched { background: rgba(70, 192, 107, 0.14); color: #7ee0a0; border-color: rgba(70, 192, 107, 0.3); }
.b-mixed { background: rgba(224, 161, 58, 0.13); color: #e6b966; border-color: rgba(224, 161, 58, 0.28); }
.b-pref { background: var(--accent-soft); color: #bcd4ff; border-color: rgba(76, 141, 255, 0.3); }
.b-alt { background: var(--elev); color: var(--dim); border-color: var(--border-2); }
.b-vendor { background: var(--elev); color: var(--dim); border-color: var(--border-2); }
.b-split { background: rgba(224, 161, 58, 0.13); color: #e6b966; border-color: rgba(224, 161, 58, 0.28); }
.b-best { background: rgba(70, 192, 107, 0.14); color: #7ee0a0; border-color: rgba(70, 192, 107, 0.3); }
/* (numeric match-score pill removed — ranking still drives card order) */

.set-legs { padding: 4px 16px; }
.leg {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  padding: 13px 0;
}
.leg + .leg { border-top: 1px solid var(--border); }
.leg-axle { font-size: 11px; font-weight: 700; letter-spacing: 0.5px; text-transform: uppercase; color: var(--mute); padding-top: 2px; }
.leg-body { min-width: 0; }
.leg-tire { font-weight: 600; font-size: 16px; }
.leg-meta { color: var(--dim); font-size: 12px; margin-top: 3px; }
.leg-size { font-weight: 700; color: var(--text); font-size: 13.5px; font-variant-numeric: tabular-nums; }
.leg-sources { margin-top: 9px; display: flex; flex-direction: column; gap: 7px; }
.src { display: flex; align-items: center; gap: 10px; }
.src-info { flex: 1; min-width: 0; display: flex; align-items: center; gap: 7px; font-size: 12.5px; color: var(--dim); }
.src-qty { font-weight: 700; color: var(--text); }
.dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.dot.ok { background: var(--ok); box-shadow: 0 0 6px rgba(70, 192, 107, 0.6); }
.dot.warn { background: var(--warn); }
.dot.bad { background: var(--bad); }
.src-price { font-weight: 700; font-size: 14px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.src-price .ea { font-size: 11px; font-weight: 500; color: var(--mute); margin-left: 2px; }
.src .btn-buy { padding: 6px 11px; font-size: 12.5px; }
.vendor { color: var(--dim); }

.set-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 16px; background: rgba(0, 0, 0, 0.18); border-top: 1px solid var(--border);
}
.set-note { font-size: 12.5px; color: var(--dim); }
.set-note strong { color: var(--text); font-weight: 600; }
.set-price { display: flex; flex-direction: column; align-items: flex-end; gap: 5px; text-align: right; }
.set-price .btn-buy4 { margin-bottom: 3px; }
.set-price-label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; color: var(--mute); }
.set-price-main { font-size: 20px; font-weight: 800; font-variant-numeric: tabular-nums; margin-top: 1px; }
.set-price-sub { font-size: 11px; color: var(--mute); margin-top: 3px; }

/* ---------- empty state + disclaimer ---------- */
.empty {
  text-align: center; padding: 64px 24px; color: var(--dim);
  border: 1px dashed var(--border-2); border-radius: var(--r); background: rgba(255, 255, 255, 0.012);
}
.empty h2 { margin: 0 0 8px; font-size: 17px; color: var(--text); }
.empty p { margin: 0 auto; max-width: 420px; font-size: 13.5px; }
.disclaimer { margin: 22px 2px 0; color: var(--mute); font-size: 11.5px; text-align: center; }

/* ---------- header nav + content pages ---------- */
.app-nav { display: flex; gap: 20px; }
.app-nav a { color: var(--dim); font-size: 13px; font-weight: 600; transition: color 0.15s; }
.app-nav a:hover { color: var(--text); }
.app-nav a.active { color: var(--text); }

.page { max-width: 760px; margin: 0 auto; padding: 36px 22px 72px; }
.page .eyebrow { color: var(--accent); font-size: 12px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; }
.page h1 { font-size: 29px; line-height: 1.22; margin: 8px 0 0; }
.page .lead { font-size: 16px; color: var(--dim); line-height: 1.6; margin: 16px 0 0; }
.page h2 { font-size: 18px; margin: 34px 0 10px; }
.page p { color: var(--dim); line-height: 1.65; margin: 0 0 12px; }
.page ul { color: var(--dim); line-height: 1.65; padding-left: 20px; margin: 0 0 12px; }
.page li { margin-bottom: 7px; }
.page strong { color: var(--text); font-weight: 600; }
.page a.inline { color: var(--accent); }
.page a.inline:hover { text-decoration: underline; }
.steps { list-style: none; padding: 0; margin: 16px 0 0; counter-reset: step; }
.steps li { position: relative; padding: 0 0 16px 44px; counter-increment: step; }
.steps li::before { content: counter(step); position: absolute; left: 0; top: -2px; width: 28px; height: 28px; border-radius: 8px; background: var(--accent-soft); color: #cfe0ff; font-weight: 700; display: grid; place-items: center; font-size: 13px; }
.steps li strong { display: block; color: var(--text); margin-bottom: 2px; }
.page .cta { display: inline-block; margin-top: 28px; background: linear-gradient(180deg, var(--accent) 0%, var(--accent-2) 100%); color: #fff; font-weight: 600; padding: 11px 20px; border-radius: var(--r-sm); }
.page .cta:hover { filter: brightness(1.08); }
.page .updated { color: var(--mute); font-size: 12.5px; margin-top: 4px; }
.note-box { border: 1px solid var(--border-2); border-radius: var(--r); padding: 14px 16px; background: var(--panel); margin: 20px 0 0; }
.note-box p { margin: 0; }

/* ---------- early-preview banner ---------- */
.preview-banner { display: flex; align-items: center; justify-content: center; gap: 14px; background: var(--accent-soft); border-bottom: 1px solid rgba(76, 141, 255, 0.3); color: #cfe0ff; font-size: 13px; line-height: 1.4; padding: 9px 40px; position: relative; text-align: center; }
.preview-banner strong { color: #fff; font-weight: 700; }
.pb-dismiss { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); background: none; border: none; color: #cfe0ff; font-size: 18px; line-height: 1; cursor: pointer; padding: 2px 6px; }
.pb-dismiss:hover { color: #fff; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .leg { grid-template-columns: 1fr auto auto; }
  .leg-axle { grid-column: 1 / -1; }
}