/* ======================================================================= */
/* caldridge.org — dark SaaS stylesheet                                    */
/* mobile-first, performance-tuned, no web fonts, no external assets       */
/* ======================================================================= */

:root {
  /* Core palette — deep-space navy */
  --bg-0: #03060f;               /* page edges */
  --bg-1: #070c1c;               /* default surface */
  --bg-2: #0b1224;               /* cards */
  --bg-3: #101a33;               /* elevated cards / hover */
  --ink: #f5f7fa;
  --ink-mute: #aab3c8;
  --ink-dim: #7b86a3;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);

  /* Brand blues */
  --accent: #7aa7ff;
  --accent-2: #5b8cff;
  --accent-glow: rgba(122, 167, 255, 0.25);
  --accent-ink: #04081a;

  /* Semantic tones */
  --good: #7ae6a8;
  --good-bg: rgba(122, 230, 168, 0.12);
  --warn: #ffc66b;
  --warn-bg: rgba(255, 198, 107, 0.12);
  --bad: #ff8e8e;
  --bad-bg: rgba(255, 142, 142, 0.12);

  /* Shapes */
  --r-sm: 8px;
  --r: 12px;
  --r-lg: 18px;
  --r-xl: 24px;

  /* Shadows (glow accents on dark) */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5), 0 0 0 1px var(--line) inset;
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.45), 0 1px 1px rgba(255, 255, 255, 0.04) inset;
  --shadow-glow: 0 0 0 1px var(--line) inset, 0 20px 50px -20px var(--accent-glow);

  /* Layout */
  --container: 1120px;
  --gutter: 20px;

  /* Type */
  --step: clamp(1rem, 0.92rem + 0.35vw, 1.08rem);
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: ui-serif, "Charter", "Iowan Old Style", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

/* Light-mode override is intentionally NOT provided.
   The whole brand is dark-first. */

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--step);
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg-0);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Starfield + nebula background.
   Layered radial gradients + a tiny SVG star pattern. Tiles infinitely.    */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 80% 55% at 50% 0%, rgba(91, 140, 255, 0.15), transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(120, 90, 220, 0.10), transparent 55%),
    radial-gradient(ellipse 70% 45% at 10% 30%, rgba(60, 130, 220, 0.08), transparent 60%),
    linear-gradient(180deg, #050914 0%, #03060f 45%, #02040c 100%);
  pointer-events: none;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.55;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='320' height='320' viewBox='0 0 320 320'><g fill='%23ffffff'><circle cx='14' cy='30' r='0.6' opacity='0.9'/><circle cx='80' cy='12' r='0.4' opacity='0.6'/><circle cx='128' cy='74' r='0.3' opacity='0.5'/><circle cx='200' cy='24' r='0.7' opacity='0.9'/><circle cx='264' cy='60' r='0.5' opacity='0.7'/><circle cx='48' cy='110' r='0.4' opacity='0.55'/><circle cx='160' cy='150' r='0.6' opacity='0.8'/><circle cx='242' cy='128' r='0.3' opacity='0.45'/><circle cx='32' cy='192' r='0.5' opacity='0.7'/><circle cx='96' cy='212' r='0.4' opacity='0.6'/><circle cx='184' cy='240' r='0.7' opacity='0.9'/><circle cx='272' cy='200' r='0.4' opacity='0.55'/><circle cx='60' cy='284' r='0.3' opacity='0.45'/><circle cx='136' cy='302' r='0.6' opacity='0.8'/><circle cx='220' cy='280' r='0.5' opacity='0.65'/><circle cx='300' cy='308' r='0.4' opacity='0.55'/></g></svg>");
  background-size: 320px 320px;
}

img, svg { max-width: 100%; display: block; }

a { color: var(--accent); text-decoration: none; }
a:hover, a:focus { text-decoration: underline; }

/* ---------- Type ---------- */
h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  line-height: 1.15;
  letter-spacing: -0.01em;
  font-weight: 600;
  color: var(--ink);
}
h1, h2.display, h3.display {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: -0.015em;
}
h1 {
  font-size: clamp(2rem, 1.3rem + 3.4vw, 3.6rem);
  line-height: 1.08;
}
h2 { font-size: clamp(1.45rem, 1.1rem + 1.4vw, 2rem); }
h3 { font-size: 1.15rem; font-weight: 600; }
p { margin: 0 0 1em; color: var(--ink-mute); }
p.lead { color: var(--ink); }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(5, 9, 20, 0.72);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
  height: 64px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 600; font-size: 1.1rem;
  color: var(--ink);
  letter-spacing: -0.015em;
  text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand .wordmark { font-family: var(--font-serif); font-weight: 500; letter-spacing: -0.02em; }
.brand-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent-2), #b49bff);
  display: grid; place-items: center;
  color: var(--accent-ink); font-weight: 700; font-size: 0.9rem;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.08) inset, 0 0 20px -8px var(--accent-glow);
}
.nav {
  display: flex; gap: 22px; font-size: 0.95rem;
  align-items: center;
}
.nav a { color: var(--ink-mute); }
.nav a:hover, .nav a:focus { color: var(--ink); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--ink); }
.nav .divider { width: 1px; height: 20px; background: var(--line); }

@media (max-width: 640px) {
  .nav { gap: 14px; font-size: 0.9rem; }
  .nav .hide-sm { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit; font-weight: 500; font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  text-decoration: none;
  background: var(--ink);
  color: var(--accent-ink);
  white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn.primary {
  background: var(--ink);
  color: var(--accent-ink);
  box-shadow: 0 8px 24px -8px rgba(255, 255, 255, 0.3);
}
.btn.primary:hover { background: #e9edf7; }
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn.ghost:hover { background: rgba(255, 255, 255, 0.04); border-color: rgba(255, 255, 255, 0.24); }
.btn.accent {
  background: var(--accent);
  color: var(--accent-ink);
}
.btn.accent:hover { background: #95b8ff; }
.btn.small { padding: 7px 14px; font-size: 0.85rem; }

.pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.82rem;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  color: var(--ink-mute);
}
.pill .star { color: #ffd66b; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: clamp(56px, 9vw, 120px) 0 clamp(24px, 6vw, 56px);
  text-align: center;
}
.hero.left { text-align: left; padding-top: clamp(40px, 6vw, 72px); }
.hero .eyebrow {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.8rem; color: var(--ink-mute);
  margin-bottom: 18px;
}
.hero .eyebrow .star { color: #ffd66b; }
.hero h1 {
  max-width: 18ch;
  margin: 0 auto 18px;
}
.hero.left h1 { margin: 0 0 18px; }
.hero p.lead {
  max-width: 60ch;
  margin: 0 auto 26px;
  color: var(--ink-mute);
  font-size: clamp(1.02rem, 0.95rem + 0.3vw, 1.15rem);
}
.hero.left p.lead { margin: 0 0 26px; }
.hero-cta {
  display: flex; flex-wrap: wrap; gap: 12px;
  justify-content: center;
}
.hero.left .hero-cta { justify-content: flex-start; }

/* Serif inline highlight */
.serif { font-family: var(--font-serif); font-weight: 500; }
.gradient-text {
  background: linear-gradient(120deg, #d8e2ff 0%, #a7c3ff 40%, #5b8cff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Cards / surfaces ---------- */
.card {
  background: linear-gradient(180deg, var(--bg-2) 0%, var(--bg-1) 100%);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 20px;
  position: relative;
  box-shadow: var(--shadow-sm);
}
.card.elev {
  background: linear-gradient(180deg, var(--bg-3) 0%, var(--bg-2) 100%);
  box-shadow: var(--shadow-md);
}
.card.glow {
  box-shadow: var(--shadow-glow);
}

/* Card hover accent */
a.card, .card-link {
  color: var(--ink);
  display: block;
  transition: transform 0.1s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
a.card:hover, .card-link:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  text-decoration: none;
  box-shadow: 0 20px 40px -20px rgba(91, 140, 255, 0.25), 0 0 0 1px var(--line-strong) inset;
}

/* ---------- Tool grid (home) ---------- */
.tool-grid {
  display: grid; gap: 16px;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) { .tool-grid.cols-2 { grid-template-columns: 1fr 1fr; } }
@media (min-width: 900px) {
  .tool-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
  .tool-grid.cols-5 { grid-template-columns: repeat(5, 1fr); }
}
.tool-card .icon {
  width: 40px; height: 40px;
  border-radius: 11px;
  display: grid; place-items: center;
  margin-bottom: 14px;
  background: linear-gradient(140deg, rgba(91, 140, 255, 0.25), rgba(180, 155, 255, 0.15));
  color: var(--ink);
  border: 1px solid var(--line);
}
.tool-card h3 { margin: 0 0 6px; font-size: 1.1rem; font-weight: 600; }
.tool-card p { color: var(--ink-mute); margin: 0; font-size: 0.93rem; }
.tool-card .arrow {
  margin-top: 14px; color: var(--accent); font-weight: 500; font-size: 0.9rem;
  display: inline-flex; align-items: center; gap: 4px;
}
.tool-card .arrow::after { content: "→"; transition: transform 0.15s ease; }
.tool-card:hover .arrow::after { transform: translateX(2px); }

/* ---------- Calculator shell ---------- */
.calc-wrap {
  display: grid; gap: 20px;
  grid-template-columns: 1fr;
  margin: 8px 0 24px;
}
@media (min-width: 960px) {
  .calc-wrap { grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 28px; }
}
.calc-wrap .card { padding: 22px; }
.calc-wrap h2.section { font-size: 1.05rem; font-weight: 600; margin: 0 0 16px; color: var(--ink); }

.field { margin-bottom: 16px; }
.field label {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.92rem; font-weight: 500; margin-bottom: 6px; color: var(--ink);
  gap: 12px;
}
.field label .help { color: var(--ink-dim); font-size: 0.8rem; font-weight: 400; text-align: right; }
.field input[type="number"],
.field input[type="text"],
.field select {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: rgba(0, 0, 0, 0.28);
  color: var(--ink);
  font: inherit;
  font-variant-numeric: tabular-nums;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  -moz-appearance: textfield;
}
.field input[type="number"]::-webkit-outer-spin-button,
.field input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  background: rgba(0, 0, 0, 0.45);
}
.field input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}
.field-row { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }
.field-row.three { grid-template-columns: 1fr 1fr 1fr; }
@media (max-width: 520px) { .field-row.three { grid-template-columns: 1fr; } }

/* Range-combo: slider + typed number, kept in sync by JS */
.range-combo {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
}
.range-combo input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}
.range-combo input[type="number"] {
  width: 96px;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: rgba(0, 0, 0, 0.28);
  color: var(--ink);
  font: inherit;
  font-variant-numeric: tabular-nums;
  text-align: right;
  -moz-appearance: textfield;
}
.range-combo input[type="number"]::-webkit-outer-spin-button,
.range-combo input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.range-combo input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.range-combo .score-label {
  font-size: 0.76rem;
  color: var(--ink-dim);
  margin-top: 4px;
  display: flex;
  justify-content: space-between;
  grid-column: 1 / -1;
}
.range-combo .score-label .score-tier {
  font-weight: 500;
  color: var(--ink);
}

/* Tabs (used on student-loan and invoice pages) */
.tabs {
  display: flex; gap: 4px; margin-bottom: 18px;
  background: rgba(0, 0, 0, 0.28);
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--line);
  width: fit-content;
}
.tabs button {
  background: transparent; border: 0; color: var(--ink-mute);
  font: inherit; font-size: 0.88rem;
  padding: 7px 16px;
  border-radius: 999px;
  cursor: pointer;
}
.tabs button.active {
  background: var(--ink);
  color: var(--accent-ink);
  font-weight: 500;
}

/* Radio group styled as pill toggle */
.radio-toggle {
  display: inline-flex;
  background: rgba(0, 0, 0, 0.28);
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--line);
  gap: 4px;
}
.radio-toggle input { position: absolute; opacity: 0; }
.radio-toggle label {
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
  color: var(--ink-mute);
  font-size: 0.88rem;
  font-weight: 500;
  display: block;
  margin: 0;
}
.radio-toggle input:checked + label {
  background: var(--ink);
  color: var(--accent-ink);
}

/* ---------- Results ---------- */
.result-headline {
  background: linear-gradient(140deg, rgba(91, 140, 255, 0.18), rgba(122, 167, 255, 0.06));
  border: 1px solid rgba(122, 167, 255, 0.25);
  border-radius: var(--r);
  padding: 18px;
  margin-bottom: 14px;
}
.result-headline .label { font-size: 0.82rem; color: var(--ink-mute); margin-bottom: 6px; }
.result-headline .value {
  font-size: clamp(1.8rem, 1.2rem + 2vw, 2.4rem);
  font-weight: 500;
  font-family: var(--font-serif);
  font-variant-numeric: tabular-nums;
  color: var(--ink); letter-spacing: -0.02em;
  line-height: 1;
}
.result-headline .sub {
  margin-top: 10px; font-size: 0.85rem; color: var(--ink-mute);
}

.result-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px;
  margin-bottom: 14px;
}
.stat {
  padding: 12px; border: 1px solid var(--line); border-radius: var(--r);
  background: rgba(0, 0, 0, 0.2);
}
.stat .label { font-size: 0.76rem; color: var(--ink-dim); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.04em; }
.stat .value { font-weight: 600; font-variant-numeric: tabular-nums; color: var(--ink); }

.breakdown {
  display: grid; gap: 4px;
  margin: 14px 0;
  padding: 14px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.breakdown .row {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.92rem;
  padding: 4px 0;
}
.breakdown .row + .row { border-top: 1px dashed var(--line); }
.breakdown .row .k { color: var(--ink-mute); }
.breakdown .row .v { font-variant-numeric: tabular-nums; font-weight: 500; color: var(--ink); }
.breakdown .row.total { font-weight: 600; color: var(--ink); padding-top: 8px; }
.breakdown .row.total .v { font-size: 1.05rem; }

/* Tone classes */
.tone-good { color: var(--good) !important; }
.tone-warn { color: var(--warn) !important; }
.tone-bad { color: var(--bad) !important; }

/* Schedule toggle + table */
.schedule-toggle {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.9rem; color: var(--accent);
  background: transparent; border: 0; cursor: pointer; padding: 4px 0;
  font-family: inherit;
}
.schedule-toggle:hover { text-decoration: underline; }
.amort-table-wrap {
  margin-top: 12px; max-height: 340px; overflow: auto;
  border: 1px solid var(--line); border-radius: var(--r);
  background: rgba(0, 0, 0, 0.2);
}
.amort-table {
  width: 100%; border-collapse: collapse; font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}
.amort-table th, .amort-table td {
  padding: 8px 10px; text-align: right;
  border-bottom: 1px solid var(--line);
}
.amort-table th:first-child, .amort-table td:first-child { text-align: left; }
.amort-table thead th {
  position: sticky; top: 0;
  background: var(--bg-2); color: var(--ink-dim);
  font-weight: 500; font-size: 0.76rem;
  text-transform: uppercase; letter-spacing: 0.04em;
}

/* ---------- Charts (inline SVG) ---------- */
.chart {
  display: block;
  width: 100%;
  max-width: 100%;
}
.donut-wrap {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 16px;
  padding: 14px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--line);
  border-radius: var(--r);
  margin-bottom: 14px;
}
.donut-wrap .donut { width: 110px; height: 110px; }
.donut-legend .row { display: flex; align-items: center; gap: 8px; font-size: 0.88rem; margin: 4px 0; }
.donut-legend .sw { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.donut-legend .k { color: var(--ink-mute); }
.donut-legend .v { margin-left: auto; font-variant-numeric: tabular-nums; font-weight: 500; color: var(--ink); }

.sparkline-wrap { padding: 14px; background: rgba(0, 0, 0, 0.2); border: 1px solid var(--line); border-radius: var(--r); margin-bottom: 14px; }
.sparkline-wrap .title { font-size: 0.78rem; color: var(--ink-dim); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.04em; }

/* ---------- Risk / credit widget ---------- */
.risk {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--bg-3) 0%, var(--bg-2) 100%);
  border-radius: var(--r-lg);
  padding: 20px;
  margin: 16px 0;
}
.risk-head {
  display: flex; justify-content: space-between; align-items: center;
  gap: 10px; flex-wrap: wrap;
  margin-bottom: 12px;
}
.risk-head h3 { margin: 0; font-size: 1rem; font-weight: 600; }
.risk-head .tier {
  font-size: 0.82rem; padding: 4px 10px; border-radius: 999px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  color: var(--ink-mute);
}
.risk-head .tier.exceptional { background: var(--good-bg); color: var(--good); border-color: rgba(122, 230, 168, 0.3); }
.risk-head .tier.verygood { background: var(--good-bg); color: var(--good); border-color: rgba(122, 230, 168, 0.3); }
.risk-head .tier.good { background: rgba(91, 140, 255, 0.12); color: var(--accent); border-color: rgba(91, 140, 255, 0.3); }
.risk-head .tier.fair { background: var(--warn-bg); color: var(--warn); border-color: rgba(255, 198, 107, 0.3); }
.risk-head .tier.poor { background: var(--bad-bg); color: var(--bad); border-color: rgba(255, 142, 142, 0.3); }

.risk-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 14px;
}
@media (max-width: 500px) { .risk-inputs { grid-template-columns: 1fr; } }

.risk-output {
  display: grid; gap: 12px;
  grid-template-columns: auto 1fr;
  align-items: center;
}
@media (max-width: 500px) { .risk-output { grid-template-columns: 1fr; } }
.risk-gauge { width: 160px; height: 95px; flex-shrink: 0; }
.risk-detail { font-size: 0.92rem; }
.risk-detail .approval { font-size: 1.1rem; font-weight: 600; margin-bottom: 4px; }
.risk-detail .rate-range { color: var(--ink-mute); margin-bottom: 6px; }
.risk-detail ul { margin: 6px 0 0; padding-left: 18px; color: var(--ink-mute); font-size: 0.88rem; }
.risk-detail ul li { margin: 2px 0; }

/* ---------- Inline term buttons ---------- */
.term { border-bottom: 1px dashed var(--ink-dim); cursor: help; }
.explain-btn {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(91, 140, 255, 0.12);
  color: var(--accent);
  border: 1px solid rgba(91, 140, 255, 0.3);
  margin-left: 4px;
  cursor: pointer;
  font-family: inherit;
  vertical-align: middle;
}
.explain-btn:hover { background: rgba(91, 140, 255, 0.22); }
.explain-btn::before {
  content: ""; width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent); display: inline-block;
}

/* AI panel (bottom-right slide-in) */
.ai-panel {
  position: fixed; inset: auto 16px 16px 16px;
  max-width: 480px; margin-left: auto;
  background: linear-gradient(180deg, var(--bg-3) 0%, var(--bg-2) 100%);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
  padding: 16px 18px;
  z-index: 100;
  transform: translateY(120%);
  transition: transform 0.25s ease;
}
.ai-panel.open { transform: translateY(0); }
.ai-panel .head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 8px; }
.ai-panel .term-name { font-weight: 600; font-size: 1rem; }
.ai-panel .badge {
  font-size: 0.72rem; padding: 2px 8px; border-radius: 999px;
  background: rgba(91, 140, 255, 0.12); color: var(--accent);
}
.ai-panel .close {
  background: none; border: 0; color: var(--ink-mute); font-size: 1.2rem;
  cursor: pointer; line-height: 1; padding: 2px 6px;
}
.ai-panel .body { font-size: 0.92rem; color: var(--ink); }
.ai-panel .status { font-size: 0.82rem; color: var(--ink-dim); margin-top: 8px; }
.ai-panel progress { width: 100%; height: 6px; margin-top: 6px; accent-color: var(--accent); }

/* ---------- Disclaimer ---------- */
.disclaimer {
  margin: 16px 0;
  padding: 14px 16px;
  background: var(--warn-bg);
  border: 1px solid rgba(255, 198, 107, 0.25);
  color: var(--warn);
  border-radius: var(--r);
  font-size: 0.9rem;
}
.disclaimer strong { font-weight: 600; color: var(--warn); }

/* ---------- Prose / article content ---------- */
.prose { max-width: 760px; margin: 0 auto; }
.prose h2 { margin-top: 2em; font-family: var(--font-serif); font-weight: 500; }
.prose h3 { margin-top: 1.6em; color: var(--ink); }
.prose ul, .prose ol { padding-left: 22px; margin: 0 0 1em; color: var(--ink-mute); }
.prose li { margin: 0.3em 0; }
.prose strong { color: var(--ink); }
.prose blockquote {
  margin: 1.2em 0;
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  background: rgba(91, 140, 255, 0.08);
  border-radius: 0 var(--r) var(--r) 0;
  color: var(--ink);
}
.prose code {
  background: rgba(91, 140, 255, 0.12);
  padding: 2px 6px; border-radius: 6px;
  font-size: 0.92em; font-family: var(--font-mono);
}
.formula {
  padding: 14px 16px;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--line);
  border-radius: var(--r);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  overflow-x: auto;
  margin: 1em 0;
  color: var(--ink);
}

/* ---------- FAQ ---------- */
.faq details {
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 14px 18px;
  background: rgba(0, 0, 0, 0.22);
  margin-bottom: 10px;
  transition: border-color 0.15s ease;
}
.faq details[open] { border-color: var(--line-strong); }
.faq summary {
  cursor: pointer; font-weight: 500;
  list-style: none;
  display: flex; justify-content: space-between; gap: 10px;
  color: var(--ink);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--ink-dim); font-weight: 400; }
.faq details[open] summary::after { content: "−"; }
.faq p { margin: 10px 0 0; color: var(--ink-mute); font-size: 0.95rem; }

/* ---------- Trust row / logos ---------- */
.trust {
  padding: 40px 0;
  text-align: center;
}
.trust .eyebrow {
  color: var(--ink-dim); font-size: 0.82rem;
  letter-spacing: 0.04em;
  margin-bottom: 22px;
}
.trust .logos {
  display: flex; flex-wrap: wrap;
  justify-content: center; align-items: center;
  gap: clamp(24px, 6vw, 56px);
  opacity: 0.7;
}
.trust .logos .logo {
  color: var(--ink-mute);
  font-size: 0.95rem; font-weight: 500;
  letter-spacing: 0.05em;
  display: inline-flex; align-items: center; gap: 6px;
}

/* ---------- Ad slot ---------- */
.ad-slot {
  display: grid; place-items: center;
  width: 100%; margin: 24px 0; padding: 0;
  font-size: 0.78rem;
  color: var(--ink-dim);
  background: rgba(0, 0, 0, 0.25);
  border: 1px dashed var(--line);
  border-radius: var(--r);
  min-height: 90px;
}
.ad-slot[data-size="rectangle"] { min-height: 250px; max-width: 336px; margin-left: auto; margin-right: auto; }
.ad-slot[data-size="in-article"] { min-height: 280px; }

/* ---------- Sections / footer ---------- */
section { padding: clamp(32px, 5vw, 64px) 0; }
section.tight { padding: clamp(16px, 3vw, 32px) 0; }
.section-head { margin-bottom: 22px; }
.section-head h2 { margin-bottom: 6px; font-family: var(--font-serif); font-weight: 500; }
.section-head p { color: var(--ink-mute); margin: 0; max-width: 64ch; }

.site-footer {
  margin-top: 64px;
  padding: 48px 0 64px;
  border-top: 1px solid var(--line);
  color: var(--ink-mute);
  font-size: 0.9rem;
}
.site-footer .grid {
  display: grid; gap: 32px;
  grid-template-columns: 1.5fr repeat(3, 1fr);
}
@media (max-width: 760px) { .site-footer .grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 440px) { .site-footer .grid { grid-template-columns: 1fr; } }
.site-footer h4 {
  font-size: 0.78rem; color: var(--ink-dim);
  text-transform: uppercase; letter-spacing: 0.06em;
  font-weight: 500; margin: 0 0 10px;
}
.site-footer a { color: var(--ink-mute); display: block; padding: 3px 0; }
.site-footer a:hover { color: var(--ink); text-decoration: none; }
.site-footer .fineprint { font-size: 0.82rem; color: var(--ink-dim); max-width: 36ch; margin-top: 10px; }
.site-footer .bottom-row {
  display: flex; justify-content: space-between; flex-wrap: wrap;
  gap: 16px;
  margin-top: 32px; padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 0.82rem; color: var(--ink-dim);
}

/* ---------- Utilities ---------- */
.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;
}
.breadcrumbs { font-size: 0.85rem; color: var(--ink-dim); margin-bottom: 12px; }
.breadcrumbs a { color: var(--ink-dim); }
.breadcrumbs a:hover { color: var(--ink); }
.muted { color: var(--ink-mute); }
.dim { color: var(--ink-dim); }
.center { text-align: center; }
.hidden { display: none !important; }

/* ---------- Hero product collage (homepage) ---------- */
.hero-visual {
  margin-top: 28px;
  position: relative;
  height: clamp(320px, 40vw, 480px);
}
.hero-visual .screen {
  position: absolute;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-strong);
  background: linear-gradient(180deg, var(--bg-3), var(--bg-1));
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.05) inset;
  overflow: hidden;
}
.hero-visual .screen-1 {
  width: 44%; height: 78%; top: 8%; left: 4%;
  transform: rotate(-4deg);
}
.hero-visual .screen-2 {
  width: 40%; height: 90%; top: 4%; left: 30%;
  z-index: 2;
}
.hero-visual .screen-3 {
  width: 44%; height: 78%; top: 8%; right: 4%;
  transform: rotate(4deg);
}
@media (max-width: 720px) {
  .hero-visual { height: 340px; }
  .hero-visual .screen-1 { width: 68%; left: -6%; transform: rotate(-6deg); }
  .hero-visual .screen-2 { width: 70%; left: 15%; z-index: 2; }
  .hero-visual .screen-3 { display: none; }
}

/* ---------- Cluster block ---------- */
.cluster {
  display: grid; gap: 10px;
  grid-template-columns: 1fr;
}
@media (min-width: 700px) { .cluster { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1000px) { .cluster { grid-template-columns: 1fr 1fr 1fr; } }
.cluster .guide-card {
  padding: 18px;
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: border-color 0.15s ease, transform 0.1s ease, background 0.15s ease;
  display: block;
}
.cluster .guide-card:hover {
  border-color: var(--line-strong);
  background: rgba(91, 140, 255, 0.06);
  text-decoration: none;
  transform: translateY(-1px);
}
.cluster .guide-card h4 {
  font-size: 0.98rem; font-weight: 600; margin: 0 0 4px;
  color: var(--ink);
}
.cluster .guide-card p { font-size: 0.88rem; margin: 0; color: var(--ink-mute); }
.cluster .guide-card .tag {
  display: inline-block;
  font-size: 0.72rem; color: var(--ink-dim);
  margin-bottom: 6px;
  text-transform: uppercase; letter-spacing: 0.04em;
}

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