/* FuelWyse — styles.css
   Clean, mobile-first, three themes, full feature coverage.
   v1 FINAL — contrast-safe for dark & midnight modes
*/

:root {
    --radius: 16px;
    --shadow: 0 10px 30px rgba(0,0,0,.08);
    --shadow2: 0 8px 20px rgba(0,0,0,.10);
    --border: rgba(120,120,120,.25);
  
    --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial,
            "Noto Sans", "Helvetica Neue", sans-serif;
  }
  
  /* ================= THEMES ================= */
  html[data-theme="light"] {
    --bg: #f7f8fb;
    --card: #ffffff;
    --text: #121826;
    --muted: rgba(18, 24, 38, .65);
  
    --primary: #1f6feb;
    --accent: #0ea5e9;
    --neutral: #e9eef7;
  
    --chip: #f0f4ff;
    --chipText: #1a2b5a;
    --focus: rgba(31,111,235,.25);
  }
  
  html[data-theme="dark"] {
    --bg: #0b1220;
    --card: #0f1a2e;
    --text: #eaf0ff;
    --muted: rgba(234, 240, 255, .68);
  
    --primary: #5b8cff;
    --accent: #22c55e;
    --neutral: #142445;
  
    --chip: rgba(91, 140, 255, .14);
    --chipText: #eaf0ff;
    --focus: rgba(91, 140, 255, .30);
  }
  
  html[data-theme="midnight"] {
    --bg: #050812;
    --card: #0a1020;
    --text: #eef2ff;
    --muted: rgba(238, 242, 255, .68);
  
    --primary: #a78bfa;
    --accent: #38bdf8;
    --neutral: #0f1730;
  
    --chip: rgba(167, 139, 250, .16);
    --chipText: #eef2ff;
    --focus: rgba(167, 139, 250, .32);
  }
  
  /* ================= BASE ================= */
  * { box-sizing: border-box; }
  html, body { height: 100%; }
  
  body {
    margin: 0;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
  }
  
  .container {
    width: min(1100px, calc(100% - 32px));
    margin: 0 auto;
  }
  
  h1 {
    margin: 0 0 10px;
    font-size: clamp(26px, 2.4vw, 38px);
    line-height: 1.12;
  }
  h2 { margin: 0 0 10px; font-size: 18px; }
  p { line-height: 1.6; }
  
  .muted { color: var(--muted); }
  .small { font-size: 12px; }
  
  /* ================= TOPBAR ================= */
  .topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    background: color-mix(in srgb, var(--bg) 78%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
  }
  
  .topbar__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
    gap: 12px;
  }
  
  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .brand__logo {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: color-mix(in srgb, var(--primary) 16%, transparent);
    border: 1px solid color-mix(in srgb, var(--primary) 30%, transparent);
  }
  .brand__logo img {
    width: 24px;
    height: 24px;
    object-fit: contain;
  }
  .brand__name { font-weight: 800; }
  .brand__tag { font-size: 12px; color: var(--muted); }
  
  .topbar__actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
  }
  
  /* ================= HERO ================= */
  .hero {
    display: grid;
    grid-template-columns: 1.2fr .8fr;
    gap: 16px;
    padding: 18px 0 8px;
  }
  @media (max-width: 900px) {
    .hero { grid-template-columns: 1fr; }
  }
  
  .pill {
    display: inline-block;
    margin-left: 8px;
    font-size: 12px;
    padding: 2px 10px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--neutral) 65%, transparent);
    border: 1px solid var(--border);
  }
  
  /* ================= CARDS & GRID ================= */
  .card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px;
  }
  
  .card__head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 12px;
  }
  
  .grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 16px;
  }
  @media (max-width: 900px) {
    .grid { grid-template-columns: 1fr; }
  }
  
  /* ================= MODE SWITCH ================= */
  .mode-switch {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  @media (max-width: 700px) {
    .mode-switch { grid-template-columns: 1fr; }
  }
  
  .mode-switch__btn {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    background: color-mix(in srgb, var(--neutral) 55%, transparent);
    color: var(--text);
    display: flex;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
  }
  
  .mode-switch__btn:hover {
    background: color-mix(in srgb, var(--primary) 12%, var(--neutral));
  }
  
  .mode-switch__btn[aria-selected="true"] {
    background: linear-gradient(
      135deg,
      color-mix(in srgb, var(--primary) 28%, var(--neutral)),
      color-mix(in srgb, var(--primary) 12%, var(--neutral))
    );
    border-color: color-mix(in srgb, var(--primary) 75%, var(--border));
    box-shadow:
      inset 0 0 0 1px color-mix(in srgb, var(--primary) 45%, transparent),
      0 8px 22px rgba(0,0,0,.35);
  }
  
  /* ================= FORMS ================= */
  .field { margin: 14px 0; }
  label { font-weight: 650; margin-bottom: 6px; display: block; }
  
  input[type="number"],
  input[type="date"],
  select {
    width: 100%;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: color-mix(in srgb, var(--neutral) 35%, transparent);
    color: var(--text);
  }
  
  input:focus, select:focus {
    outline: none;
    box-shadow: 0 0 0 4px var(--focus);
  }
  
  input[type="range"] { width: 100%; }
  
  .row { display: flex; align-items: center; justify-content: space-between; }
  .inline { display: flex; gap: 10px; margin-top: 10px; }
  
  .two {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  @media (max-width: 700px) {
    .two { grid-template-columns: 1fr; }
  }
  
  /* ================= PRICE META ================= */
  .price-meta {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-top: 6px;
  }
  .price-meta input[type="date"] {
    padding: 6px 8px;
    font-size: 12px;
  }
  
  /* ================= BUTTONS (FIXED CONTRAST) ================= */
  .btn {
    border-radius: 14px;
    padding: 10px 12px;
    cursor: pointer;
    border: 1px solid color-mix(in srgb, var(--primary) 45%, var(--border));
    background: linear-gradient(
      135deg,
      color-mix(in srgb, var(--primary) 35%, var(--neutral)),
      color-mix(in srgb, var(--primary) 20%, var(--neutral))
    );
    color: var(--text);
    box-shadow: var(--shadow2);
  }
  
  .btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 26px rgba(0,0,0,.35);
  }
  
  .btn--ghost {
    background: color-mix(in srgb, var(--neutral) 45%, transparent);
    border: 1px solid var(--border);
    box-shadow: none;
  }
  
  .btn.small { padding: 6px 10px; font-size: 12px; }
  
  .actions { display: flex; gap: 10px; flex-wrap: wrap; }
  
  /* ================= SEGMENTED ================= */
  .segmented {
    display: inline-flex;
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
  }
  .segmented button {
    padding: 9px 12px;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text);
  }
  .segmented button.is-active {
    background: color-mix(in srgb, var(--primary) 30%, transparent);
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--primary) 50%, transparent);
  }
  
  /* ================= RESULTS ================= */
  .heroResult {
    padding: 14px;
    border-radius: var(--radius);
    background: color-mix(in srgb, var(--neutral) 46%, transparent);
    border: 1px solid var(--border);
  }
  .heroResult__label { font-size: 12px; color: var(--muted); }
  .heroResult__value {
    font-size: clamp(30px, 3.2vw, 44px);
    font-weight: 900;
  }
  
  .kpis {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 12px;
  }
  @media (max-width: 700px) {
    .kpis { grid-template-columns: 1fr; }
  }
  
  .kpi {
    padding: 12px;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: color-mix(in srgb, var(--neutral) 32%, transparent);
  }
  
  /* ================= BREAKDOWN ================= */
  .breakdown {
    margin-top: 12px;
  }
  .breakdown div {
    display: flex;
    justify-content: space-between;
    padding: 8px 2px;
    border-bottom: 1px dashed var(--border);
  }
  
  /* ================= NOTES ================= */
  .assumptions, .compare, .note {
    margin-top: 12px;
    padding: 12px;
    border-radius: 14px;
    font-size: 12px;
  }
  
  .note {
    background: color-mix(in srgb, var(--neutral) 35%, transparent);
  }
  .compare {
    border: 1px solid color-mix(in srgb, var(--accent) 55%, var(--border));
    background: color-mix(in srgb, var(--accent) 12%, transparent);
  }
  
  /* ================= ADS & FOOTER ================= */
  .ad-slot {
    height: 120px;
    display: grid;
    place-items: center;
    text-align: center;
    background: color-mix(in srgb, var(--neutral) 42%, transparent);
  }
  .ad-slot--thin { height: 90px; margin-top: 14px; }
  
  .footer {
    padding: 18px 0 40px;
    text-align: center;
  }