/* ============================================================
   Harshal Dasani — Tools section: shared design system
   Used by /tools/ index + every tool page. Vanilla CSS, no build.
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,600;9..144,700&family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  /* brand */
  --navy: #0A2754; --gold: #A67D3E; --gold-bright: #C79A52;
  --cream: #EBE5D7; --espresso: #0E0C0A; --indigo-black: #0C0A24;
  /* light theme (default) */
  --bg: #F3EEE2; --surface: #FFFFFF; --surface-2: #F7F2E8;
  --text: #14110C; --text-soft: #5A5446; --border: rgba(10,39,84,.12);
  --accent: var(--gold); --accent-on: #fff;
  --pos: #2F7D56; --warn: #C98A2E; --neg: #B4452F;
  --shadow: 0 18px 44px rgba(10,39,84,.10);
  --chart-inv: #0A2754;
}
html[data-theme="dark"] {
  --bg: #0E0C0A; --surface: #16131F; --surface-2: #1A1730;
  --text: #EBE5D7; --text-soft: #A89F8C; --border: rgba(235,229,215,.12);
  --accent: var(--gold-bright); --accent-on: #14110C;
  --pos: #3A9B6E; --warn: #D6A24A; --neg: #C4503A;
  --shadow: 0 18px 44px rgba(0,0,0,.45);
  --chart-inv: #e6ebf5;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; background: var(--bg); }
body {
  font-family: 'Inter', -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.55;
  -webkit-text-size-adjust: 100%; overflow-x: hidden;
}
body::before {
  content: ''; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(1200px 700px at 85% -10%, rgba(166,125,62,0.06), transparent 60%),
    radial-gradient(900px 600px at -5% 105%, rgba(166,125,62,0.04), transparent 60%);
}
a { color: inherit; text-decoration: none; }
.tabnum, .stat-value, .stat-card b, table.tool-table td { font-variant-numeric: tabular-nums lining-nums; }

.page { position: relative; z-index: 1; max-width: 1180px; margin: 0 auto;
  padding: max(26px, env(safe-area-inset-top)) max(40px, env(safe-area-inset-right)) 72px max(40px, env(safe-area-inset-left)); }

/* ---- masthead ---- */
.masthead { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 18px;
  padding: max(12px, env(safe-area-inset-top)) 0 18px; border-bottom: 1px solid var(--border);
  margin-bottom: 34px; position: sticky; top: 0; z-index: 100; background: var(--bg); }
.mast-back { font-size: 11px; letter-spacing: 1.6px; text-transform: uppercase; color: var(--text-soft); font-weight: 600; justify-self: start; }
.mast-back:hover { color: var(--accent); }
.mast-trail { justify-self: end; text-align: right; font-size: 11px; letter-spacing: 1.6px; text-transform: uppercase; color: var(--text-soft); font-weight: 500; white-space: nowrap; }
.mast-trail a:hover { color: var(--accent); }
.theme-toggle { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px;
  border-radius: 50%; background: transparent; border: 1px solid var(--border); color: var(--text-soft);
  cursor: pointer; padding: 0; justify-self: end; transition: all .2s ease; }
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-1px); }
.theme-toggle .icon-sun { display: none; } html[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ---- header ---- */
.tool-head { margin-bottom: 26px; }
.tool-h1 { font-family: 'Fraunces', Georgia, serif; font-weight: 600; font-size: clamp(30px, 4.4vw, 50px);
  line-height: 1.04; letter-spacing: -0.01em; color: var(--text); margin: 0 0 12px; }
.tool-dek { font-size: 16px; color: var(--text-soft); max-width: 640px; margin: 0 0 10px; line-height: 1.5; }
.tool-byline { font-size: 12px; letter-spacing: .4px; color: var(--text-soft); }
.tool-byline b { color: var(--accent); font-weight: 600; }

/* ---- two-pane ---- */
.tool-grid { display: grid; grid-template-columns: minmax(0,0.92fr) minmax(0,1.08fr); gap: 24px; align-items: start; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 24px; box-shadow: var(--shadow); }
html[data-theme="dark"] .panel { box-shadow: none; }
.panel-title { font-family: 'Fraunces', serif; font-weight: 600; font-size: 18px; color: var(--text); margin: 0 0 18px; }

/* ---- input row (label + slider + number + unit) ---- */
.input-row { margin-bottom: 22px; }
.input-row > label { display: block; font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 9px; }
.input-row .hint { font-weight: 400; color: var(--text-soft); font-size: 12px; }
.input-line { display: flex; align-items: center; gap: 12px; }
.input-line input[type="range"] { flex: 1; accent-color: var(--accent); height: 4px; }
.num-wrap { display: inline-flex; align-items: center; gap: 6px; background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 8px 10px; min-width: 116px; }
.num-wrap input { width: 100%; border: 0; background: transparent; color: var(--text); font: inherit; font-weight: 600;
  text-align: right; font-variant-numeric: tabular-nums; outline: none; }
.num-wrap .unit { font-size: 12px; color: var(--text-soft); white-space: nowrap; }
.num-wrap:focus-within { border-color: var(--accent); }

/* ---- stat cards ---- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px,1fr)); gap: 12px; margin: 0 0 20px; }
.stat-card { background: var(--surface-2); border: 1px solid var(--border); border-radius: 14px; padding: 16px 18px; }
.stat-card .stat-label { font-size: 11px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--text-soft); margin-bottom: 7px; }
.stat-card .stat-value { font-family: 'Fraunces', serif; font-weight: 600; font-size: 27px; line-height: 1; color: var(--text); font-variant-numeric: tabular-nums; }
.stat-card .stat-exact { font-size: 11px; color: var(--text-soft); margin-top: 5px; font-variant-numeric: tabular-nums; }
.stat-card.is-gold { background: var(--accent-soft, rgba(166,125,62,.10)); border-color: rgba(166,125,62,.45); }
.stat-card.is-gold .stat-value { color: var(--accent); }
.stat-card.is-pos .stat-value { color: var(--pos); }
.stat-card.is-warn .stat-value { color: var(--warn); }
.stat-card.is-neg .stat-value { color: var(--neg); }
.stat-card.big { grid-column: 1 / -1; }
.stat-card.big .stat-value { font-size: clamp(34px, 6vw, 46px); }

/* ---- regime badge + band ---- */
.regime-badge { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 14px;
  letter-spacing: .4px; padding: 9px 16px; border-radius: 999px; border: 1px solid currentColor; }
.regime-badge.pos { color: var(--pos); } .regime-badge.warn { color: var(--warn); } .regime-badge.neg { color: var(--neg); }
.regime-band { display: flex; height: 40px; border-radius: 10px; overflow: hidden; position: relative; margin: 16px 0 6px; border: 1px solid var(--border); }
.regime-band .zone { flex: 1; display: flex; align-items: center; justify-content: center; font-size: 11px; font-weight: 600; color: #fff; opacity: .85; }
.regime-band .zone.z-pos { background: var(--pos); } .regime-band .zone.z-warn { background: var(--warn); } .regime-band .zone.z-neg { background: var(--neg); }
.regime-marker { position: absolute; top: -6px; width: 3px; height: 52px; background: var(--text); transition: left .25s ease; }
.regime-marker::after { content: ''; position: absolute; top: -5px; left: -4px; width: 11px; height: 11px; background: var(--text); border-radius: 50%; }

/* ---- segmented control ---- */
.seg-control { display: inline-flex; background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; padding: 4px; gap: 4px; margin-bottom: 22px; flex-wrap: wrap; }
.seg-control button { border: 0; background: transparent; color: var(--text-soft); font: inherit; font-weight: 600; font-size: 13px;
  padding: 9px 16px; border-radius: 9px; cursor: pointer; transition: all .15s ease; }
.seg-control button.is-active { background: var(--accent); color: var(--accent-on); }

/* ---- interpretation line ---- */
.interp { background: var(--surface-2); border-left: 3px solid var(--accent); border-radius: 0 10px 10px 0;
  padding: 14px 16px; font-size: 14.5px; color: var(--text); line-height: 1.55; margin: 18px 0 0; }

/* ---- winners/losers strip ---- */
.wl-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 16px; }
.wl-card { border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; background: var(--surface-2); }
.wl-card h4 { margin: 0 0 8px; font-size: 12px; letter-spacing: .6px; text-transform: uppercase; }
.wl-card.pos h4 { color: var(--pos); } .wl-card.neg h4 { color: var(--neg); }
.wl-card p { margin: 0; font-size: 13px; color: var(--text-soft); line-height: 1.5; }

/* ---- table ---- */
table.tool-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.tool-table th, table.tool-table td { padding: 9px 10px; border-bottom: 1px solid var(--border); text-align: right; }
table.tool-table th:first-child, table.tool-table td:first-child { text-align: left; }
table.tool-table th { font-size: 11px; letter-spacing: .6px; text-transform: uppercase; color: var(--text-soft); font-weight: 700; }
.cf-row input { width: 100%; border: 1px solid var(--border); background: var(--surface-2); color: var(--text); border-radius: 8px; padding: 7px 9px; font: inherit; font-variant-numeric: tabular-nums; }
.row-del { cursor: pointer; color: var(--neg); border: 0; background: transparent; font-size: 16px; }

/* ---- details / how it works ---- */
.how { margin: 24px 0 0; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); overflow: hidden; }
.how > summary { cursor: pointer; padding: 16px 20px; font-weight: 600; font-size: 14px; color: var(--text); list-style: none; }
.how > summary::-webkit-details-marker { display: none; }
.how > summary::after { content: '+'; float: right; color: var(--accent); font-size: 18px; }
.how[open] > summary::after { content: '\2212'; }
.how .how-body { padding: 0 20px 20px; font-size: 14px; color: var(--text-soft); line-height: 1.6; }
.how code, .how pre { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 12.5px; background: var(--surface-2); padding: 1px 5px; border-radius: 5px; }

/* ---- notes / callouts ---- */
.note { font-size: 13px; color: var(--text-soft); line-height: 1.55; margin: 12px 0; padding-left: 16px; border-left: 2px solid var(--border); }

/* ---- disclaimer ---- */
.disclaimer { margin-top: 28px; font-size: 11.5px; line-height: 1.6; color: var(--text-soft);
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px; }
.disclaimer b { color: var(--text); }

/* ---- actions ---- */
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; align-items: center; }
.btn { display: inline-flex; align-items: center; gap: 7px; font: inherit; font-weight: 600; font-size: 13.5px;
  padding: 11px 18px; border-radius: 11px; cursor: pointer; transition: all .18s ease; border: 1px solid var(--border); background: transparent; color: var(--text); }
.btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.btn-gold { background: var(--accent); color: var(--accent-on); border-color: var(--accent); }
.btn-gold:hover { color: var(--accent-on); filter: brightness(1.05); }
.btn-link { padding: 11px 0; border: 0; color: var(--accent); }

/* ---- footer ---- */
.tool-footer { margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  font-size: 11px; color: var(--text-soft); letter-spacing: .4px; }
.tool-footer a:hover { color: var(--accent); }

/* ---- tools INDEX grid ---- */
.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr)); gap: 18px; }
.tools-section-label { font-size: 12px; font-weight: 700; letter-spacing: 1.4px; text-transform: uppercase; color: var(--accent); margin: 34px 0 14px; }
.tool-tile { display: flex; flex-direction: column; gap: 8px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 16px; padding: 22px; box-shadow: var(--shadow); transition: transform .22s ease, border-color .22s ease; }
html[data-theme="dark"] .tool-tile { box-shadow: none; }
.tool-tile:hover { transform: translateY(-3px); border-color: rgba(166,125,62,.4); }
.tool-tile .ic { font-size: 26px; }
.tool-tile h3 { font-family: 'Fraunces', serif; font-weight: 600; font-size: 19px; color: var(--text); margin: 4px 0 0; }
.tool-tile p { font-size: 13.5px; color: var(--text-soft); margin: 0; line-height: 1.5; }
.tool-tile .go { margin-top: auto; padding-top: 10px; font-size: 12px; font-weight: 600; color: var(--accent); }

/* ---- responsive ---- */
@media (max-width: 640px),
       (min-width: 641px) and (max-width: 1180px) and (orientation: portrait),
       (orientation: landscape) and (max-height: 520px) {
  .tool-grid { grid-template-columns: 1fr; }
  .page { padding: 22px 20px 56px; }
}
@media (max-width: 420px) {
  .num-wrap { min-width: 96px; }
  .wl-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .masthead { grid-template-columns: 1fr auto; gap: 10px; }
  .mast-trail { display: none; }
}