/* =============================================================
   Limbo — design system

   IBM Carbon-inspired layout discipline (a strong grid, generous
   negative space, monospace accents) but with a distinct palette:
   warm sand + ink for light mode, deep indigo + cyan for dark.
   ============================================================= */

:root {
    /* Font stacks.
       --font-display goes on every headline + UI label (eyebrows, nav, buttons,
         stat values) — JetBrains Mono gives the whole product a code-editor
         tech feel without making body paragraphs hard to read.
       --font-body is for paragraphs and long-form prose only — Inter is the
         de-facto web product sans, optimized for reading at 14–18 px.
       --font-mono is for actual code blocks and inline-code spans. Same as
         display but kept separate so we can swap one without the other. */
    --font-display: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
    --font-body:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
                    Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono:    "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

    /* ---- Light theme palette ---- */
    --bg:           #f6f1e8;
    --bg-elev-1:    #ffffff;
    --bg-elev-2:    #ede5d4;
    --ink:          #1a1c24;
    --ink-soft:     #41454f;
    --ink-muted:    #6b6f78;
    --accent:       #5b3aa1;
    --accent-hot:   #7b59c9;
    --accent-cool:  #138a8a;
    --border:       #d8cfba;
    --border-soft:  #e9e0cc;
    --code-bg:      #1a1c24;
    --code-ink:     #ede5d4;
    --good:         #1f7a4d;
    --warn:         #b8590a;
    --bad:          #b03030;
}

[data-theme="dark"] {
    /* ---- Dark theme palette ---- */
    --bg:           #0d0f1a;
    --bg-elev-1:    #161827;
    --bg-elev-2:    #1f2236;
    --ink:          #e6e8f2;
    --ink-soft:     #b0b3c5;
    --ink-muted:    #7a7e95;
    --accent:       #8b6fd8;
    --accent-hot:   #b094ff;
    --accent-cool:  #4fd5d5;
    --border:       #2a2d44;
    --border-soft:  #1f2236;
    --code-bg:      #1f2236;
    --code-ink:     #b094ff;
    --good:         #3ec792;
    --warn:         #e8a35a;
    --bad:          #ee6868;
}

/* ---- Reset & base ---- */

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--ink);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    transition: background 200ms ease, color 200ms ease;
}

/* ---- Display font: JetBrains Mono ----
   Applied to every header AND every short UI label. Goal: a code-editor
   tech feel without making long-form text hard to read. !important
   prevents later same-class rules from accidentally re-asserting their
   font-family when they tweak other typography properties. */
h1, h2, h3, h4,
.hero__title,
.hero__eyebrow,
.section__heading,
.section__eyebrow,
.form__title,
.feature__title,
.nav__brand,
.nav__links a,
.btn,
.stat-card__label,
.stat-card__value,
.key-row__name,
.tag,
.footer__col h4,
.font-display {
    font-family: var(--font-display) !important;
}

/* Mono headlines benefit from tighter tracking + a lighter weight at
   the largest display size — counter-balances the wider character set. */
.hero__title {
    font-weight: 600;
    letter-spacing: -0.03em;
}
.section__heading,
h1, h2 {
    font-weight: 600;
    letter-spacing: -0.02em;
}
h3, h4, .feature__title, .form__title {
    font-weight: 600;
    letter-spacing: -0.01em;
}

a {
    color: var(--accent);
    text-decoration: none;
}
a:hover { color: var(--accent-hot); }

code, pre, .mono {
    font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}

::selection { background: var(--accent); color: var(--bg); }

/* ---- Layout ---- */

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 96px 0;
    border-top: 1px solid var(--border-soft);
}

.section--tight { padding: 56px 0; }

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

/* ---- Header / nav ---- */

.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--bg) 92%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-soft);
}
.nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.nav__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 18px;
    letter-spacing: -0.01em;
    color: var(--ink);
}
.nav__brand svg { width: 28px; height: 28px; }
.nav__links {
    display: flex;
    align-items: center;
    gap: 28px;
}
.nav__links a {
    color: var(--ink-soft);
    font-size: 14px;
    font-weight: 500;
}
.nav__links a:hover,
.nav__links a.active { color: var(--ink); }
.nav__actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ---- Buttons ---- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 4px;
    font-weight: 500;
    font-size: 14px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 120ms ease, transform 80ms ease, border-color 120ms ease;
    text-decoration: none;
    font-family: inherit;
}
.btn--primary {
    background: var(--accent);
    color: #ffffff;
}
.btn--primary:hover { background: var(--accent-hot); color: #ffffff; }
.btn--ghost {
    background: transparent;
    color: var(--ink);
    border-color: var(--border);
}
.btn--ghost:hover {
    background: var(--bg-elev-2);
    color: var(--ink);
}
.btn--small { padding: 6px 14px; font-size: 13px; }
.btn--block { width: 100%; justify-content: center; }
.btn--danger { color: var(--bad); border-color: var(--bad); background: transparent; }
.btn--danger:hover { background: var(--bad); color: #fff; }

/* ---- Theme toggle ---- */

.theme-toggle {
    background: transparent;
    border: 1px solid var(--border);
    width: 36px; height: 36px;
    border-radius: 4px;
    cursor: pointer;
    color: var(--ink);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle:hover { background: var(--bg-elev-2); }

/* Show sun in dark mode, moon in light mode */
[data-theme="dark"] .theme-toggle__sun { display: none; }
[data-theme="dark"] .theme-toggle__moon { display: inline-block; }
.theme-toggle__sun { display: inline-block; }
.theme-toggle__moon { display: none; }

/* ---- Hero ---- */

.hero {
    padding: 96px 0 80px;
    position: relative;
    overflow: hidden;
}
.hero__inner {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 48px;
    align-items: center;
}
@media (max-width: 880px) {
    .hero__inner { grid-template-columns: 1fr; }
}
.hero__eyebrow {
    font-family: "JetBrains Mono", monospace;
    font-size: 13px;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 16px;
}
.hero__title {
    font-size: clamp(36px, 5vw, 60px);
    line-height: 1.05;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--ink);
    margin-bottom: 20px;
}
.hero__title em {
    font-style: normal;
    background: linear-gradient(90deg, var(--accent), var(--accent-cool));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.hero__lede {
    font-size: 18px;
    color: var(--ink-soft);
    max-width: 560px;
    margin-bottom: 32px;
}
.hero__actions { display: flex; gap: 12px; flex-wrap: wrap; }

.hero__graphic {
    aspect-ratio: 1 / 1;
    max-width: 460px;
    width: 100%;
    margin-left: auto;
}

/* ---- Feature cards ---- */

.feature {
    background: var(--bg-elev-1);
    border: 1px solid var(--border-soft);
    border-radius: 4px;
    padding: 28px;
    transition: border-color 120ms ease, transform 120ms ease;
}
.feature:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}
.feature__icon {
    width: 36px;
    height: 36px;
    border-radius: 4px;
    background: linear-gradient(135deg, var(--accent), var(--accent-cool));
    margin-bottom: 16px;
    display: flex; align-items: center; justify-content: center;
}
.feature__icon span {
    color: #fff;
    font-family: "JetBrains Mono", monospace;
    font-weight: 700;
    font-size: 18px;
}
.feature__title {
    font-size: 17px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 10px;
}
.feature__body {
    font-size: 14px;
    color: var(--ink-soft);
    line-height: 1.6;
}

/* ---- Section heading ---- */

.section__heading {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--ink);
    margin-bottom: 12px;
}
.section__subheading {
    font-size: 17px;
    color: var(--ink-muted);
    margin-bottom: 48px;
    max-width: 680px;
}
.section__eyebrow {
    font-family: "JetBrains Mono", monospace;
    font-size: 12px;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    margin-bottom: 12px;
}

/* ---- Code blocks ---- */

pre.code {
    background: var(--code-bg);
    color: var(--code-ink);
    padding: 22px 24px;
    border-radius: 4px;
    font-size: 13px;
    line-height: 1.65;
    overflow-x: auto;
    margin: 16px 0;
}
.inline-code {
    background: var(--bg-elev-2);
    border: 1px solid var(--border-soft);
    padding: 1px 6px;
    border-radius: 3px;
    font-size: 0.92em;
    color: var(--accent);
}

/* ---- Tables ---- */

table.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0 32px;
    font-size: 14px;
}
table.data-table th,
table.data-table td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border-soft);
}
table.data-table th {
    font-weight: 600;
    color: var(--ink-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--bg-elev-2);
}
table.data-table tr:hover td { background: var(--bg-elev-2); }
table.data-table td.num { font-variant-numeric: tabular-nums; text-align: right; }
table.data-table td.win { color: var(--good); font-weight: 600; }

/* ---- Bar charts (CSS-only) ---- */

.bar-chart {
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.bar-row {
    display: grid;
    grid-template-columns: 140px 1fr 100px;
    gap: 16px;
    align-items: center;
    font-size: 13px;
}
.bar-row__label { color: var(--ink-soft); }
.bar-row__bar {
    height: 24px;
    background: var(--bg-elev-2);
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}
.bar-row__bar::before {
    content: "";
    position: absolute;
    inset: 0;
    width: var(--bar-fill, 50%);
    background: linear-gradient(90deg, var(--accent), var(--accent-cool));
    border-radius: 3px;
}
.bar-row__value {
    font-family: "JetBrains Mono", monospace;
    text-align: right;
    color: var(--ink);
    font-variant-numeric: tabular-nums;
}

/* ---- Forms ---- */

.form {
    background: var(--bg-elev-1);
    border: 1px solid var(--border-soft);
    border-radius: 4px;
    padding: 32px;
    max-width: 440px;
    margin: 40px auto;
}
.form__title { font-size: 22px; font-weight: 700; margin-bottom: 20px; }
.form__field { margin-bottom: 16px; }
.form__field label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--ink-soft);
    margin-bottom: 6px;
}
.form__field input,
.form__field textarea,
.form__field select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 3px;
    background: var(--bg);
    color: var(--ink);
    font-size: 14px;
    font-family: inherit;
}
.form__field input:focus,
.form__field textarea:focus {
    outline: none;
    border-color: var(--accent);
}
.form__hint {
    font-size: 12px;
    color: var(--ink-muted);
    margin-top: 6px;
}
.form__errors {
    color: var(--bad);
    font-size: 13px;
    margin-bottom: 12px;
}
.form__alt {
    text-align: center;
    font-size: 13px;
    color: var(--ink-soft);
    margin-top: 16px;
}

/* ---- Messages / alerts ---- */

.messages { list-style: none; padding: 0; margin: 24px 0; }
.messages li {
    padding: 12px 16px;
    border-radius: 4px;
    background: var(--bg-elev-2);
    border-left: 3px solid var(--accent);
    color: var(--ink);
    margin-bottom: 8px;
    font-size: 14px;
}
.messages li.error { border-left-color: var(--bad); }
.messages li.success { border-left-color: var(--good); }

/* ---- Stat cards / dashboard ---- */

.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; }
.stat-card {
    background: var(--bg-elev-1);
    border: 1px solid var(--border-soft);
    border-radius: 4px;
    padding: 22px;
}
.stat-card__label {
    font-size: 12px;
    color: var(--ink-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}
.stat-card__value {
    font-family: "JetBrains Mono", monospace;
    font-size: 28px;
    font-weight: 700;
    color: var(--ink);
    font-variant-numeric: tabular-nums;
}
.stat-card__delta {
    font-size: 12px;
    color: var(--ink-muted);
    margin-top: 4px;
}

/* ---- API key list ---- */

.key-row {
    background: var(--bg-elev-1);
    border: 1px solid var(--border-soft);
    border-radius: 4px;
    padding: 18px 22px;
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 16px;
    align-items: center;
    margin-bottom: 10px;
}
.key-row__name { font-weight: 600; color: var(--ink); }
.key-row__token {
    font-family: "JetBrains Mono", monospace;
    font-size: 13px;
    color: var(--ink-muted);
}
.key-row__meta { font-size: 12px; color: var(--ink-muted); }

/* ---- Tag / badge ---- */

.tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 3px;
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    background: var(--bg-elev-2);
    color: var(--accent);
    border: 1px solid var(--border-soft);
}
.tag--good { color: var(--good); }
.tag--warn { color: var(--warn); }
.tag--bad { color: var(--bad); }

/* =============================================================
   Animations

   data-animate elements start hidden + slightly offset, then slide
   into place when IntersectionObserver flips .is-visible on them
   (see animations.js). Body fade-in is unconditional on first paint.
   prefers-reduced-motion strips all transitions in animations.js by
   adding .is-visible without the transition — but we also short-
   circuit transitions in CSS as belt-and-suspenders.
   ============================================================= */

@media (prefers-reduced-motion: no-preference) {
    [data-animate] {
        opacity: 0;
        transform: translate3d(0, 18px, 0);
        transition:
            opacity 480ms cubic-bezier(0.22, 0.61, 0.36, 1),
            transform 560ms cubic-bezier(0.22, 0.61, 0.36, 1);
        will-change: opacity, transform;
    }
    [data-animate="fade-up"]   { transform: translate3d(0, 18px, 0); }
    [data-animate="fade-left"] { transform: translate3d(18px, 0, 0); }
    [data-animate="fade-right"]{ transform: translate3d(-18px, 0, 0); }
    [data-animate="fade-in"]   { transform: none; }
    [data-animate].is-visible {
        opacity: 1;
        transform: none;
    }

    /* Initial page fade. body starts at 0 opacity; animations.js adds
       .page-loaded the moment DOMContentLoaded fires (or sooner). */
    body {
        opacity: 0;
        transition: opacity 320ms ease, background 200ms ease, color 200ms ease;
    }
    body.page-loaded { opacity: 1; }

    /* View Transitions API: cross-fade between same-origin pages. */
    @keyframes limbo-fade-in  { from { opacity: 0; } to { opacity: 1; } }
    @keyframes limbo-fade-out { from { opacity: 1; } to { opacity: 0; } }
    ::view-transition-old(root) { animation: limbo-fade-out 180ms ease both; }
    ::view-transition-new(root) { animation: limbo-fade-in  280ms ease both; }

    /* Card hover lift — already half-defined on .feature; extend it
       consistently to other interactive surfaces. */
    .stat-card,
    .key-row {
        transition:
            transform 160ms ease,
            border-color 160ms ease,
            background 160ms ease;
    }
    .stat-card:hover,
    .key-row:hover {
        transform: translateY(-2px);
        border-color: var(--accent);
    }

    /* Button micro-bounce on click. */
    .btn:active { transform: translateY(1px); }
}

/* Reduced-motion path: explicitly clear any transforms / transitions
   so users who've asked for less motion get a static page. */
@media (prefers-reduced-motion: reduce) {
    [data-animate],
    [data-animate].is-visible {
        opacity: 1;
        transform: none;
        transition: none;
    }
    body { opacity: 1; }
}

/* ---- Footer ---- */

.footer {
    border-top: 1px solid var(--border-soft);
    padding: 48px 0 32px;
    color: var(--ink-muted);
    font-size: 13px;
}
.footer__inner {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 32px;
}
@media (max-width: 700px) {
    .footer__inner { grid-template-columns: 1fr 1fr; }
}
.footer__col h4 { font-size: 12px; text-transform: uppercase; color: var(--ink); margin-bottom: 12px; letter-spacing: 0.08em; }
.footer__col a { display: block; color: var(--ink-muted); margin-bottom: 6px; }
.footer__col a:hover { color: var(--ink); }
.footer__bottom {
    margin-top: 40px;
    padding-top: 16px;
    border-top: 1px solid var(--border-soft);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}