/* PriceCraft — dark, calm, Lighthouse-friendly. No frameworks. */
:root {
  --bg: #0b1220;
  --surface: #111a2c;
  --surface-2: #17233a;
  --border: #24334e;
  --text: #e7edf7;
  --muted: #93a4c0;
  --accent: #14b8a6;
  --accent-strong: #0f766e;
  --danger: #f87171;
  --radius: 12px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- topbar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.75rem 1rem;
  background: rgba(17, 26, 44, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}

.brand { display: flex; align-items: center; gap: 0.5rem; font-weight: 700; }

.logo {
  display: inline-grid; place-items: center;
  width: 30px; height: 30px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #04121f; border-radius: 9px; font-size: 1.05rem;
}

.controls { display: flex; gap: 0.5rem; }

select {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.4rem 0.55rem;
  font: inherit;
}

/* ---------- layout ---------- */
main { max-width: 880px; margin: 0 auto; padding: 1.25rem 1rem 3rem; }

.hero { text-align: center; margin: 1.5rem 0 2rem; }
.hero h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); margin: 0 0 0.4rem; }
.hero p { color: var(--muted); margin: 0 auto; max-width: 46ch; }

/* ---------- tabs ---------- */
.tabs {
  display: flex; gap: 0.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.35rem;
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
}

.tabs button {
  flex: 1;
  padding: 0.6rem 0.5rem;
  background: transparent;
  color: var(--muted);
  border: 0;
  border-radius: 9px;
  font: inherit; font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.tabs button[aria-selected="true"] {
  background: var(--accent-strong);
  color: #fff;
}

/* ---------- forms & panels ---------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 0.9rem; }

label { display: block; margin-bottom: 0.9rem; }
label > span { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 0.3rem; }

input[type="number"], input[type="text"] {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.55rem 0.65rem;
  font: inherit;
}

input:focus-visible, select:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.hint { color: var(--muted); font-size: 0.83rem; }
.hint.warn { color: var(--danger); }

.actions { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-top: 0.25rem; }

button.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #04121f;
  border: 0;
  border-radius: 9px;
  padding: 0.6rem 1.1rem;
  font: inherit; font-weight: 700;
  cursor: pointer;
}

button.mini {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.35rem 0.7rem;
  font: inherit; font-size: 0.82rem;
  cursor: pointer;
}

button.danger { color: var(--danger); }
.file-btn { display: inline-block; cursor: pointer; margin-bottom: 0; }

/* ---------- results ---------- */
.result { margin-top: 1.1rem; }

.kpis {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.7rem;
}

.kpi {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
}

.kpi-label { display: block; font-size: 0.76rem; color: var(--muted); margin-bottom: 0.15rem; }
.kpi strong { font-size: 1.15rem; font-variant-numeric: tabular-nums; }

.hero-kpi {
  background: linear-gradient(160deg, rgba(20, 184, 166, 0.22), rgba(15, 118, 110, 0.12));
  border-color: var(--accent-strong);
}
.hero-kpi strong { font-size: 1.45rem; color: var(--accent); }

.ending-row {
  display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
  margin-top: 0.8rem; color: var(--muted); font-size: 0.88rem;
}
.ending-row strong { color: var(--text); }

.error-box {
  margin-top: 1rem;
  background: rgba(248, 113, 113, 0.12);
  border: 1px solid rgba(248, 113, 113, 0.4);
  color: var(--danger);
  border-radius: 9px;
  padding: 0.6rem 0.8rem;
  font-size: 0.88rem;
}

/* ---------- saved scenarios ---------- */
.saved {
  margin-top: 1.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}

.saved-head { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; flex-wrap: wrap; }
.saved-head h2 { font-size: 1.05rem; margin: 0; }
.saved-actions { display: flex; gap: 0.45rem; align-items: center; flex-wrap: wrap; }

#saved-list { list-style: none; margin: 0.8rem 0 0; padding: 0; display: grid; gap: 0.5rem; }

.saved-item {
  display: flex; align-items: center; justify-content: space-between; gap: 0.75rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 0.55rem 0.75rem;
}
.saved-item strong { display: block; font-size: 0.92rem; }
.saved-detail { color: var(--muted); font-size: 0.78rem; }

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
  font-size: 0.84rem;
  padding: 1.25rem 1rem 2rem;
}
footer a { color: var(--accent); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}