/* IndeXplorer site. Tokens from projects/indexplorer/DESIGN.md (static fallback scheme;
   the app itself follows dynamic colour on Android 12+). System font stack, no font files.
   Signature: the dimension line (2 px primary rule with end ticks) under the H1 and the
   current nav item. Primary colour marks location only (links, focus, current item). */

:root {
    color-scheme: light dark;
    --surface: #F8F9FB;
    --surface-low: #F2F4F7;
    --surface-container: #ECEEF2;
    --on-surface: #191C20;
    --on-surface-variant: #43474E;
    --primary: #2457A6;
    --outline-variant: #C3C6CF;
    --highlight: #FFDEA6;
    --on-highlight: #191C20;
    --button: #191C20;
    --on-button: #F8F9FB;
    --grid: rgba(36, 87, 166, 0.06);
    --r-s: 6px;
    --r-l: 12px;
    --wrap: 68rem;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --surface: #111317;
        --surface-low: #191C20;
        --surface-container: #1D2024;
        --on-surface: #E2E2E8;
        --on-surface-variant: #C3C6CF;
        --primary: #A9C7FF;
        --outline-variant: #43474E;
        --highlight: #5E4200;
        --on-highlight: #E2E2E8;
        --button: #E2E2E8;
        --on-button: #111317;
        --grid: rgba(169, 199, 255, 0.05);
    }
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
    margin: 0;
    background: var(--surface);
    color: var(--on-surface);
    font-size: 1rem;
    line-height: 1.6;
    overflow-wrap: anywhere;
}

::selection { background: var(--highlight); color: var(--on-highlight); }

img { max-width: 100%; height: auto; display: block; }

a { color: var(--primary); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 2px; }

h1, h2, h3 { line-height: 1.2; margin: 0 0 0.6em; text-wrap: balance; }
h1 { font-size: clamp(2rem, 1.4rem + 2.6vw, 3.1rem); font-weight: 750; letter-spacing: -0.015em; }
h2 { font-size: clamp(1.45rem, 1.2rem + 1vw, 1.9rem); font-weight: 700; }
h3 { font-size: 1.12rem; font-weight: 650; }
p { margin: 0 0 1em; }
p, li { max-width: 68ch; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 1.25rem; }

.skip-link {
    position: absolute; left: 1rem; top: -4rem; z-index: 10;
    background: var(--button); color: var(--on-button);
    padding: 0.75rem 1rem; border-radius: var(--r-s);
}
.skip-link:focus { top: 1rem; }

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

/* Dimension line: rule with end ticks */
.dim {
    position: relative;
    display: block;
    width: min(12rem, 60%);
    height: 2px;
    margin: 0 0 1.4rem;
    background: var(--primary);
}
.dim::before, .dim::after {
    content: "";
    position: absolute; top: -5px;
    width: 1.5px; height: 12px;
    background: var(--primary);
}
.dim::before { left: 0; }
.dim::after { right: 0; }

/* Header */
.topbar { background: var(--surface-low); color: var(--on-surface); border-bottom: 1px solid var(--outline-variant); }
.topbar .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.25rem 1rem; min-height: 4rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; min-height: 48px; color: var(--on-surface); text-decoration: none; font-weight: 700; font-size: 1.15rem; }
.brand img { border-radius: var(--r-s); }
.site-nav ul { display: flex; flex-wrap: wrap; gap: 0 0.25rem; list-style: none; margin: 0; padding: 0; }
.site-nav a {
    display: inline-flex; align-items: center; min-height: 48px; padding: 0 0.75rem;
    color: var(--on-surface); text-decoration: none; font-weight: 550;
    border-bottom: 2px solid transparent;
}
.site-nav a:hover { text-decoration: underline; }
.site-nav a[aria-current="page"] { border-bottom-color: var(--primary); }

/* Drafting-sheet ground for hero and page heads */
.sheet {
    background-color: var(--surface);
    background-image:
        linear-gradient(var(--grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid) 1px, transparent 1px);
    background-size: 40px 40px;
    border-bottom: 1px solid var(--outline-variant);
}

.hero { padding: 2.5rem 0 3rem; }
.hero-grid { display: grid; gap: 2.5rem; align-items: center; }
.hero .sub { font-size: 1.15rem; color: var(--on-surface-variant); }
.cta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem 1.25rem; margin-top: 1.5rem; }
.cta p { margin: 0; color: var(--on-surface-variant); font-weight: 550; }
.play-badge { display: inline-block; min-height: 48px; }
.play-badge img { width: 188px; height: 56px; }
.hero-shot { justify-self: center; width: min(20rem, 100%); }

/* Framed marketing shots get a 1 px border */
.hero-shot img, .shot img, .wide img { border: 1px solid var(--outline-variant); border-radius: var(--r-l); background: var(--surface-container); }

@media (min-width: 52rem) {
    .hero-grid { grid-template-columns: minmax(0, 1fr) 20rem; }
}

/* Sections */
.section { padding: 3rem 0; border-bottom: 1px solid var(--outline-variant); }
.section:last-of-type { border-bottom: 0; }
.answer { font-size: 1.12rem; }
.muted { color: var(--on-surface-variant); }

.split { display: grid; gap: 2rem; align-items: center; }
.split .shot { width: min(17rem, 100%); justify-self: center; margin: 0; }
@media (min-width: 52rem) {
    .split { grid-template-columns: minmax(0, 1fr) 17rem; }
}

.cards { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); list-style: none; margin: 1.5rem 0 0; padding: 0; }
.cards li { max-width: none; background: var(--surface-container); color: var(--on-surface); border-radius: var(--r-l); padding: 1.25rem; }
.cards h3 { margin-bottom: 0.4rem; }
.cards p { margin: 0; color: var(--on-surface-variant); }

.plain { padding-left: 1.25rem; }
.plain li { margin-bottom: 0.5rem; }

/* Gallery */
.gallery { display: grid; gap: 1.25rem 1rem; grid-template-columns: repeat(auto-fill, minmax(min(100%, 8.25rem), 1fr)); list-style: none; margin: 1.5rem 0 0; padding: 0; }
.gallery li { max-width: none; }
.shot { margin: 0; }
.shot figcaption { margin-top: 0.5rem; font-size: 0.9rem; color: var(--on-surface-variant); }
.wide { margin: 1.5rem 0 0; }
.wide figcaption { margin-top: 0.5rem; font-size: 0.9rem; color: var(--on-surface-variant); }

/* Question links */
.qlinks { list-style: none; margin: 1rem 0 0; padding: 0; }
.qlinks li:first-child { border-top: 1px solid var(--outline-variant); }
.qlinks li { max-width: none; border-bottom: 1px solid var(--outline-variant); }
.qlinks a { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 48px; padding: 0.75rem 0; color: var(--on-surface); text-decoration: none; font-weight: 550; }
.qlinks a:hover span { text-decoration: underline; }
.qlinks svg { flex: none; width: 20px; height: 20px; fill: none; stroke: var(--primary); stroke-width: 2; }

/* Inner pages */
.page-head { padding: 1.5rem 0 2rem; }
.crumbs ol { display: flex; flex-wrap: wrap; list-style: none; margin: 0 0 1.25rem; padding: 0; font-size: 0.95rem; color: var(--on-surface-variant); }
.crumbs li { display: flex; align-items: center; }
.crumbs li + li::before { content: "›"; padding: 0 0.5rem; }
.crumbs a { display: inline-flex; align-items: center; min-height: 48px; }
.lede { font-size: 1.12rem; color: var(--on-surface-variant); }

.step { padding: 2.5rem 0; border-bottom: 1px solid var(--outline-variant); }
.step:last-child { border-bottom: 0; }
.limits h3 { margin-top: 1.75rem; }

.faq-item { padding: 2rem 0; border-bottom: 1px solid var(--outline-variant); scroll-margin-top: 1rem; }
.faq-item:last-child { border-bottom: 0; }
.faq-item h2 { font-size: 1.35rem; }
.faq-item .answer { margin-bottom: 0.75rem; }

.end { padding: 3rem 0; background: var(--surface-low); color: var(--on-surface); border-top: 1px solid var(--outline-variant); }

/* Focus rings on tinted bands: set per band so they stay visible if a band colour changes */
.topbar :focus-visible, .end :focus-visible, .footer :focus-visible, .cards :focus-visible { outline-color: var(--primary); }

/* Footer */
.footer { background: var(--surface-container); color: var(--on-surface); padding: 2.5rem 0; border-top: 1px solid var(--outline-variant); }
.footer-top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1.25rem; }
.footer-top p { margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 0 1.25rem; list-style: none; margin: 0 0 1rem; padding: 0; }
.footer-links a { display: inline-flex; align-items: center; min-height: 48px; }
.fine { font-size: 0.9rem; color: var(--on-surface-variant); }
.fine p { margin: 0; }

.num { font-variant-numeric: tabular-nums; }