/* Everyday tools (snow day, square footage, ratio, tip) */
.footer-grid { grid-template-columns: 1.4fr repeat(4, 1fr); }
@media (max-width: 960px) { .footer-grid { grid-template-columns: repeat(4, 1fr); } .footer-grid > div:first-child { grid-column: 1 / -1; } }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) {
  .row.sq-row { grid-template-columns: 1fr 1fr; }
  .row.sq-row > :last-child { grid-column: 1 / -1; width: 100%; }
}
.mini-table td button { color: inherit; }
input:disabled { opacity: .45; cursor: not-allowed; }

/* Calcora "holographic instrument" theme, dark only. Layered after style.css. */
:root, :root:not([data-theme="dark"]), :root[data-theme="light"] {
  color-scheme: dark;
  --bg: #070b1a;
  --bg-2: #0c1330;
  --panel: rgba(16, 24, 54, 0.62);
  --panel-solid: #0f1736;
  --line: rgba(150, 175, 255, 0.12);
  --line-strong: rgba(150, 175, 255, 0.24);
  --fg: #eaf0ff;
  --muted: #9aa6c8;
  --faint: #6a76a0;
  --ion: #5be3ff;
  --ion-ink: #041526;
  --ion-soft: rgba(91, 227, 255, 0.1);
  --violet: #9b7bff;
  --rose: #ff7ac8;
  --holo: linear-gradient(115deg, #5be3ff 0%, #9b7bff 48%, #ff7ac8 100%);
  --holo-soft: linear-gradient(115deg, rgba(91,227,255,.55), rgba(155,123,255,.45) 50%, rgba(255,122,200,.5));
  --good: #5ef0b6;
  --warn: #ffd27a;
  --bad: #ff8aa8;
  --shadow: 0 30px 80px -30px rgba(2, 4, 20, 0.9);
  --radius: 18px;
  --radius-sm: 11px;
}
/* Background: a still nebula instead of the dot grid */
.aurora { height: 900px;
  background:
    radial-gradient(700px 420px at 8% -80px, rgba(91, 227, 255, .16), transparent 70%),
    radial-gradient(620px 380px at 62% -120px, rgba(155, 123, 255, .2), transparent 70%),
    radial-gradient(520px 340px at 100% 120px, rgba(255, 122, 200, .12), transparent 70%); }
.aurora::after {
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px; opacity: .55;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000 20%, transparent 75%); }

/* Header */
.site-header { background: color-mix(in srgb, var(--bg) 70%, transparent); border-bottom-color: transparent;
  box-shadow: 0 1px 0 var(--line); }
.brand span { font-weight: 600; letter-spacing: -0.02em; }
.nav a { border-radius: 999px; padding: 8px 14px; }
.nav a[aria-current="page"] { color: var(--fg); background: transparent; box-shadow: inset 0 0 0 1px var(--line-strong); }
.theme-toggle { border-radius: 999px; }

/* Type: quiet sentence-case labels instead of tracked caps */
h1 { font-size: clamp(36px, 6vw, 60px); letter-spacing: -0.035em; line-height: 1.04; }
.eyebrow, .panel-title, .group-title, .card .go, .row-head, .mini-table th, .footer-grid h3, .table-wrap th {
  text-transform: none; letter-spacing: 0; font-family: var(--body); }
.eyebrow { font-size: 14px; font-weight: 500; color: var(--muted); }
.eyebrow::before { width: 8px; height: 8px; border-radius: 50%; background: var(--holo); box-shadow: 0 0 12px var(--violet); }
.panel-title { font-size: 13.5px; font-weight: 600; color: var(--muted); }
.group-title { font-size: 15px; font-weight: 600; color: var(--fg); }
.row-head, .mini-table th, .table-wrap th { font-size: 12.5px; font-weight: 600; }
.footer-grid h3 { font-size: 13.5px; font-weight: 600; color: var(--fg); }
.card .go { font-size: 14px; font-weight: 600; }
.lede { font-size: 19px; }

/* Home hero headline: holographic ink */
.home-hero h1 { font-size: clamp(42px, 7vw, 76px); letter-spacing: -0.045em; line-height: 1;
  background: linear-gradient(170deg, var(--fg) 35%, color-mix(in srgb, var(--fg) 40%, var(--violet)) 75%, color-mix(in srgb, var(--fg) 45%, var(--rose)));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.home-hero h1 em { color: inherit; }

/* Panels */
.console { border-radius: var(--radius); background: var(--panel); border-color: var(--line); }
input, select { border-radius: var(--radius-sm); background: color-mix(in srgb, var(--bg-2) 85%, transparent); border-color: var(--line-strong); }
input:focus, select:focus { border-color: var(--violet); box-shadow: 0 0 0 3px color-mix(in srgb, var(--violet) 22%, transparent), 0 0 24px -6px var(--violet); }
.segmented { border-radius: 999px; }
.segmented button { border-radius: 999px; }
.segmented button[aria-pressed="true"] { background: var(--holo); color: #06112a; box-shadow: 0 6px 20px -8px var(--violet); }

/* The one bold element: the result readout as a holographic glass display */
.readout { border: 1px solid transparent; border-radius: 22px;
  background:
    linear-gradient(160deg, color-mix(in srgb, var(--panel-solid) 92%, transparent), color-mix(in srgb, var(--bg) 88%, transparent)) padding-box,
    var(--holo-soft) border-box;
  box-shadow: var(--shadow), 0 0 60px -20px color-mix(in srgb, var(--violet) 60%, transparent), inset 0 1px 0 rgba(255,255,255,.06); }
.readout::before { height: 140px; inset: -40px 10% auto; opacity: .55; filter: blur(30px);
  background: var(--holo); border-radius: 50%; }
.readout > * { position: relative; }
.big-value { font-weight: 500; font-size: clamp(52px, 8vw, 76px); }
.big-num { display: inline-block; padding-right: .04em;
  background: linear-gradient(100deg, #5be3ff 0%, #9b7bff 55%, #ff7ac8 100%); -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 24px color-mix(in srgb, var(--violet) 50%, transparent)); }
.big-value small { color: var(--muted); }
.big-num.pulse { animation: holo-pulse .7s ease-out; }
@keyframes holo-pulse { from { filter: brightness(1.6); } to { filter: brightness(1); } }
.stats { border-radius: 14px; background: var(--line); }
.stat { background: color-mix(in srgb, var(--panel-solid) 80%, transparent); }
.chip { font-family: var(--body); font-weight: 600; letter-spacing: 0; background: color-mix(in srgb, currentColor 10%, transparent); border-color: color-mix(in srgb, currentColor 40%, transparent); }

/* Buttons */
.btn { border-radius: 999px; }
.btn.primary { background: var(--holo); border-color: transparent; color: #06112a; box-shadow: 0 10px 30px -12px var(--violet); }
.btn.primary:hover { filter: brightness(1.08) saturate(1.1); color: #06112a; }
.btn:not(.primary):hover { border-color: var(--violet); color: var(--fg); }

/* Cards: holographic edge appears on hover */
.card { border-radius: var(--radius); border: 1px solid var(--line);
  background: linear-gradient(var(--panel), var(--panel)) padding-box, linear-gradient(var(--line), var(--line)) border-box; }
.card:hover { transform: translateY(-3px); border-color: transparent;
  background: linear-gradient(color-mix(in srgb, var(--panel-solid) 94%, transparent), color-mix(in srgb, var(--panel-solid) 94%, transparent)) padding-box, var(--holo) border-box;
  box-shadow: 0 20px 40px -24px var(--violet); }
.card .card-icon { border-radius: 12px; background: var(--holo-soft); color: #fff; }
.card h3 { font-size: 18.5px; }

/* Home quick panel uses the readout style */
.quick.readout { padding: 26px; }

/* Article */
.formula { border-left: 0; border-radius: 12px; box-shadow: inset 2px 0 0 var(--violet); }
.example { background: color-mix(in srgb, var(--violet) 8%, transparent); border-color: color-mix(in srgb, var(--violet) 22%, transparent); }
.toc a:hover { border-color: var(--violet); }
.faq details { border-radius: 14px; }
.faq details[open] { border-color: color-mix(in srgb, var(--violet) 35%, transparent); }
.faq summary::after { color: var(--violet); }
.prose li::marker { color: var(--violet); }
a { color: var(--ion); }

/* Footer */
.site-footer { background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--bg-2) 60%, transparent)); }

@media (prefers-reduced-motion: reduce) { .card:hover { transform: none; } }

/* Dark only: no theme switch */
#theme-btn { display: none !important; }