/* AgeForge landing page. The terminal pane stays dark in both color
   schemes; the page around it follows the reader's preference. */

:root {
    --bg: #07090c;
    --fg: #d8d4c8;
    --dim: #8b929a;
    --line: #1c222a;
    --accent: #ffd24a;
    --accent-ink: #ffd24a;
    --cyan: #39c5cf;
    --term-bg: #0d1117;
    --term-fg: #e3e1db;
    --term-line: #2a323c;
    --term-dim: #7d8590;
    --ui: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
    --map: ui-monospace, Menlo, "DejaVu Sans Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
    --fs: 12px;
    color-scheme: dark;
}

@media (prefers-color-scheme: light) {
    :root {
        --bg: #f3efe6;
        --fg: #1d1e20;
        --dim: #5d6168;
        --line: #d8d1c2;
        --accent-ink: #8a5d00;
        color-scheme: light;
    }
}

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

html {
    background: var(--bg);
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font: 400 16px/1.6 var(--ui);
}

a {
    color: inherit;
}

code {
    font-family: var(--ui);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.skip {
    position: absolute;
    left: 16px;
    top: -60px;
    z-index: 30;
    padding: 8px 12px;
    background: var(--accent);
    color: #111;
    text-decoration: none;
}

.skip:focus {
    top: 12px;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* ── Top bar ─────────────────────────────────────────────────────────── */

.bar {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 48px;
    padding: 0 20px;
    background: linear-gradient(var(--bg) 55%, transparent);
    pointer-events: none;
}

.bar a {
    pointer-events: auto;
}

.bar-mark {
    color: var(--accent-ink);
    font-size: 20px;
    text-decoration: none;
}

.bar-nav {
    display: flex;
    gap: 22px;
    font-size: 13px;
    letter-spacing: 0.04em;
}

.bar-nav a {
    color: var(--dim);
    text-decoration: none;
}

.bar-nav a:hover {
    color: var(--fg);
}

/* ── Timeline: a pinned stage over a tall scroll ─────────────────────── */

.timeline {
    position: relative;
    height: 100vh;
    height: 100svh;
}

/* Each frame holds for one --step of scroll; script.js sets --steps. */
.js .timeline {
    height: calc(100vh + var(--steps, 3.2) * var(--step, 80vh));
}

.stage {
    position: sticky;
    top: 0;
    height: 100vh;
    height: 100svh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 56px 20px 44px;
    overflow: hidden;
}

.pane {
    position: relative;
    margin: 0;
    max-width: 100%;
    background: var(--term-bg);
    border: 1px solid var(--term-line);
    border-radius: 10px;
    box-shadow:
        0 30px 80px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(255, 255, 255, 0.02) inset;
    overflow: hidden;
}

.pane-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    height: 32px;
    padding: 0 14px;
    border-bottom: 1px solid var(--term-line);
    color: var(--term-dim);
    font-size: 12px;
}

.pane-name::before {
    content: "● ● ●";
    margin-right: 12px;
    letter-spacing: 2px;
    color: #39414b;
}

.hud {
    display: flex;
    align-items: baseline;
    gap: 10px;
    color: var(--term-fg);
    white-space: nowrap;
}

.hud-age {
    color: #ffd700;
    font-weight: 600;
}

.hud-n {
    color: var(--term-dim);
    font-variant-numeric: tabular-nums;
}

.ticks {
    display: grid;
    grid-template-columns: repeat(22, 1fr);
    gap: 2px;
    height: 3px;
    background: var(--term-bg);
}

.ticks span {
    background: #1d242d;
    transition: background 0.3s;
}

.ticks span.on {
    background: #6b5a1e;
}

.ticks span.stop {
    background: #2c3540;
}

.ticks span.stop.on {
    background: #9c7f22;
}

.ticks span.now {
    background: #ffd700;
}

.screen {
    position: relative;
    overflow: hidden;
    background: var(--term-bg);
}

/* The map: real text, one block per row, a span per style run. Characters
   outside ASCII and box drawing sit in an <i> one character wide, so a
   fallback font can't push the grid out of line. */
.map {
    margin: 0;
    padding: 0;
    font: 400 var(--fs) / 1.2 var(--map);
    color: #e3e1db;
    background: var(--term-bg);
    white-space: pre;
    letter-spacing: 0;
    font-variant-ligatures: none;
    -webkit-font-smoothing: antialiased;
}

.map code {
    font: inherit;
    display: block;
}

.map .row {
    display: block;
    height: 1.2em;
}

.map .row > span {
    display: inline-block;
    height: 1.2em;
    vertical-align: top;
}

.map i {
    display: inline-block;
    width: 1ch;
    font-style: normal;
    text-align: center;
    overflow: visible;
}

.screen::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: repeating-linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0) 0,
        rgba(0, 0, 0, 0) 2px,
        rgba(0, 0, 0, 0.08) 3px
    );
}

/* ── Hero copy, over the pane at the top of the scroll ───────────────── */

.pane-wrap {
    position: relative;
    max-width: 100%;
}

.hero {
    position: absolute;
    z-index: 1;
    left: 5%;
    bottom: 9%;
    pointer-events: none;
    transition:
        opacity 0.5s,
        transform 0.5s;
}

.hero-title {
    display: inline-block;
    margin: 0 0 6px;
    padding: 2px 10px;
    background: #ffd700;
    color: #0d1117;
    font: 800 var(--hero-tag, 14px) / 1.4 var(--ui);
    letter-spacing: 0.3em;
    text-transform: uppercase;
}

.hero::before {
    content: "";
    position: absolute;
    inset: -60px -80px -40px -80px;
    z-index: -1;
    background: radial-gradient(ellipse at 30% 60%, rgba(13, 17, 23, 0.92), rgba(13, 17, 23, 0.6) 45%, rgba(13, 17, 23, 0) 72%);
}

.hero-line span {
    display: block;
}

.hero-line {
    margin: 0;
    color: #fff;
    font: 800 var(--hero-fs, clamp(30px, 6vw, 96px)) / 1.02 var(--ui);
    letter-spacing: -0.03em;
    text-shadow:
        0 2px 0 #0d1117,
        0 0 40px rgba(13, 17, 23, 0.95),
        0 0 80px rgba(13, 17, 23, 0.9);
}

.scrolled .hero {
    opacity: 0;
    transform: translateY(12px);
}

.cue {
    position: absolute;
    bottom: 14px;
    left: 0;
    right: 0;
    margin: 0;
    text-align: center;
    color: var(--dim);
    font-size: 12px;
    letter-spacing: 0.12em;
    transition: opacity 0.4s;
}

.scrolled .cue {
    opacity: 0;
}

/* ── Below the scroll ─────────────────────────────────────────────────── */

.install,
.numbers {
    width: min(860px, calc(100% - 32px));
    margin: 0 auto;
}

.install {
    padding: 14vh 0 8vh;
}

.install-title {
    margin: 0 0 14px;
    color: var(--dim);
    font-size: 13px;
    font-weight: 400;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.term {
    background: var(--term-bg);
    color: var(--term-fg);
    border: 1px solid var(--term-line);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

.term-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 8px 10px 8px 8px;
    border-bottom: 1px solid var(--term-line);
}

.os {
    display: flex;
    gap: 4px;
}

.os-tab,
.copy {
    font: 400 13px/1 var(--ui);
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--term-dim);
    cursor: pointer;
}

.os-tab[aria-selected="true"] {
    color: var(--term-fg);
    background: #161b22;
    border-color: var(--term-line);
}

.copy {
    color: #0d1117;
    background: #ffd700;
    font-weight: 600;
}

.copy.done {
    background: #3fb950;
}

.cmd {
    display: flex;
    gap: 14px;
    padding: 22px 22px 6px;
    font-size: clamp(15px, 2.1vw, 20px);
    line-height: 1.5;
}

.cmd code {
    overflow-wrap: anywhere;
    color: #fff;
}

.ps {
    color: #ffd700;
    user-select: none;
}

.cmd-note {
    margin: 0;
    padding: 4px 22px 18px 44px;
    color: var(--term-dim);
    font-size: 13px;
}

.cmd-note code,
.repl code {
    color: var(--term-fg);
}

.repl {
    border-top: 1px dashed var(--term-line);
    padding: 16px 22px 18px;
    font-size: 15px;
}

.repl-out {
    max-height: 16em;
    overflow-y: auto;
}

.repl-out p {
    margin: 0 0 4px;
    white-space: pre-wrap;
}

.r-echo {
    color: var(--term-dim);
}

.r-echo::before {
    content: "❯ ";
    color: #ffd700;
}

.r-ok {
    color: var(--term-fg);
}

.r-err {
    color: #f85149;
}

.r-sys {
    color: var(--term-dim);
}

.r-hint {
    color: var(--cyan);
}

.r-hint button {
    font: inherit;
    color: inherit;
    background: none;
    border: 0;
    border-bottom: 1px dotted currentColor;
    padding: 0;
    cursor: pointer;
}

.repl-in {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-top: 6px;
}

.repl-field {
    position: relative;
    flex: 1;
}

.repl-field input,
.ghost {
    font: 400 16px/1.6 var(--ui);
    padding: 0;
    margin: 0;
    border: 0;
    letter-spacing: 0;
}

.repl-field input {
    position: relative;
    width: 100%;
    background: transparent;
    color: #fff;
    caret-color: #ffd700;
    outline: none;
}

.ghost {
    position: absolute;
    inset: 0;
    color: #4b535d;
    white-space: pre;
    pointer-events: none;
}

.ghost b {
    font-weight: 400;
    color: transparent;
}

.more {
    margin-top: 18px;
    color: var(--dim);
    font-size: 14px;
}

.more summary {
    cursor: pointer;
}

.more-body {
    padding: 8px 0 0;
}

.more-body code,
.more-body pre {
    color: var(--fg);
}

.dl {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 18px;
    padding: 0;
    list-style: none;
}

.src {
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: 8px;
    overflow-x: auto;
    font-size: 13px;
}

/* ── Numbers strip ────────────────────────────────────────────────────── */

.numbers {
    padding: 2vh 0 6vh;
}

.stats {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    margin: 0;
    padding: 0;
    list-style: none;
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: hidden;
    background: var(--line);
}

.hstat {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 14px 6px;
    background: var(--bg);
}

.hstat-n {
    color: var(--accent-ink);
    font-size: 22px;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
}

.hstat-l {
    color: var(--dim);
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* ── Footer ───────────────────────────────────────────────────────────── */

.foot {
    width: min(860px, calc(100% - 32px));
    margin: 0 auto;
    padding: 4vh 0 8vh;
    border-top: 1px solid var(--line);
    color: var(--dim);
    font-size: 13px;
}

.foot-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
}

.foot-nav a,
.foot-line a {
    color: var(--dim);
}

.foot-nav a:hover {
    color: var(--fg);
}

.foot-line {
    margin: 14px 0 0;
}

/* ── Small screens ────────────────────────────────────────────────────── */

@media (max-width: 720px) {
    .bar {
        padding: 0 16px;
    }

    .bar-nav {
        gap: 16px;
    }

    .timeline {
        --step: 85vh;
    }

    .stage {
        padding: 56px 16px 40px;
    }

    .hero {
        position: static;
        margin-top: 22px;
    }

    .scrolled .hero {
        transform: translateY(8px);
    }

    .hero::before {
        display: none;
    }

    .hero-line {
        text-shadow: none;
        color: var(--fg);
    }

    .stats {
        grid-template-columns: repeat(4, 1fr);
    }

    .stats .hstat:last-child {
        grid-column: span 2;
    }

    .cmd {
        padding: 18px 16px 6px;
        gap: 10px;
    }

    .cmd-note {
        padding: 4px 16px 16px 36px;
    }

    .repl {
        padding: 14px 16px 16px;
    }

    .os-tab,
    .copy {
        padding: 8px 9px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .hero,
    .cue,
    .ticks span {
        transition: none;
    }
}