/* Open source pages: landing + source explorers. Scoped to body.page-os. */

body.page-os {
    --os-surface: rgba(255, 255, 255, 0.025);
    --os-surface-2: rgba(255, 255, 255, 0.05);
    --os-border: rgba(255, 255, 255, 0.08);
    --os-border-strong: rgba(255, 255, 255, 0.22);
    --os-text: #f2f0f5;
    --os-muted: #8a8595;
    --os-accent: var(--col-typexex);
    --os-radius: 14px;

    --tok-kw: #7fe3a9;
    --tok-str: #e6c691;
    --tok-num: #9fc2ff;
    --tok-com: #666273;
    --tok-type: #f2f0f5;
    --tok-fn: #c8b9ff;

    background-color: #0f0f0f;
    color: var(--os-text);
    font-family: 'Inter', system-ui, sans-serif;
    line-height: 1.5;
}

body.page-os .navbar { border-bottom-color: rgba(255, 255, 255, 0.06); background: rgba(15, 15, 15, 0.72); }
body.page-os .brand span { color: var(--os-accent); }
body.page-os footer { border-top-color: var(--os-border); background: transparent; font-size: 0.74rem; letter-spacing: 0.06em; }

.os-bg { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.os-glow {
    position: absolute; inset: 0;
    background:
        radial-gradient(ellipse 60% 40% at 50% -10%, rgba(255, 255, 255, 0.055), transparent 62%),
        radial-gradient(ellipse 40% 32% at 92% 6%, rgba(0, 255, 100, 0.03), transparent 60%);
}
.os-noise {
    position: absolute; inset: 0; opacity: 0.03;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='140' height='140'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}
body.page-os main { position: relative; z-index: 1; }

@keyframes osFadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.os-enter { opacity: 0; animation: osFadeUp 0.7s var(--ease) forwards; animation-delay: var(--os-delay, 0s); }
@media (prefers-reduced-motion: reduce) { .os-enter { opacity: 1; animation: none; } }

.os-wrap { max-width: 1180px; margin: 0 auto; padding: 0 clamp(20px, 4vw, 40px); }

/* ─── Shared bits ─── */
.os-kicker {
    display: inline-flex; align-items: center; gap: 9px;
    font-family: var(--font-code); font-size: 0.72rem; font-weight: 500;
    letter-spacing: 0.14em; text-transform: uppercase; color: var(--os-muted);
}
.os-kicker::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--os-accent); box-shadow: 0 0 10px rgba(0, 255, 100, 0.45); }

.os-btn {
    display: inline-flex; align-items: center; gap: 9px; padding: 13px 22px;
    border: 1px solid var(--os-border); border-radius: 11px; background: var(--os-surface);
    color: var(--os-text); font-family: var(--font-code); font-size: 0.8rem; font-weight: 600;
    transition: background-color .25s var(--ease), border-color .25s var(--ease), transform .25s var(--ease);
}
.os-btn:hover { background: var(--os-surface-2); border-color: var(--os-border-strong); }
.os-btn.primary { background: #f2f0f5; border-color: transparent; color: #0f0f0f; box-shadow: 0 4px 24px rgba(255, 255, 255, 0.14); }
.os-btn.primary:hover { background: #fff; transform: translateY(-1px); }
.os-btn .arr { transition: transform .25s var(--ease); }
.os-btn:hover .arr { transform: translateX(3px); }
.os-btn:focus-visible, .os-link:focus-visible, .os-tab:focus-visible, .os-file:focus-visible, .os-row:focus-visible { outline: 1px solid var(--os-border-strong); outline-offset: 3px; }

.os-link {
    display: inline-flex; align-items: center; gap: 7px; padding: 0; background: none; border: 0; cursor: pointer;
    border-bottom: 1px solid transparent; color: var(--os-text);
    font-family: var(--font-code); font-size: 0.76rem; font-weight: 600;
    transition: color .25s var(--ease), border-color .25s var(--ease);
}
.os-link:hover { color: var(--os-accent); border-bottom-color: currentColor; }

.os-tag {
    padding: 3px 9px; border: 1px solid var(--os-border); border-radius: 999px;
    font-family: var(--font-code); font-size: 0.62rem; letter-spacing: 0.06em; text-transform: uppercase;
    color: var(--os-muted); white-space: nowrap;
}

/* ─── Code window ─── */
.os-window { border: 1px solid var(--os-border); border-radius: var(--os-radius); background: rgba(8, 8, 8, 0.72); overflow: hidden; min-width: 0; }
.os-window-bar {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    padding: 0 6px 0 14px; min-height: 44px; border-bottom: 1px solid var(--os-border);
    font-family: var(--font-code); font-size: 0.74rem; color: var(--os-muted);
}
.os-window-bar > span:first-child { min-width: 0; padding: 12px 0; }
.os-window-name { color: var(--os-text); font-weight: 600; word-break: break-all; }
.os-window-meta { margin-left: 10px; font-weight: 400; color: var(--os-muted); }
.os-window-actions { flex-shrink: 0; display: flex; gap: 14px; padding-right: 8px; }
.os-window-actions .os-link { font-size: 0.72rem; color: var(--os-muted); }
.os-window-actions .os-link:hover { color: var(--os-text); }

.os-tabs { flex: 1; min-width: 0; display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none; }
.os-tabs::-webkit-scrollbar { display: none; }
.os-tab {
    position: relative; padding: 13px 12px; background: none; border: 0; cursor: pointer; white-space: nowrap;
    font-family: var(--font-code); font-size: 0.74rem; color: var(--os-muted); transition: color .2s var(--ease);
}
.os-tab:hover { color: var(--os-text); }
.os-tab[aria-selected="true"] { color: var(--os-text); }
.os-tab[aria-selected="true"]::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: -1px; height: 1px; background: var(--os-accent); }

.os-code-wrap { overflow: auto; max-height: var(--os-code-max, none); scrollbar-width: thin; scrollbar-color: rgba(255,255,255,.16) transparent; }
.os-code {
    display: grid; grid-template-columns: auto minmax(0, 1fr); margin: 0; padding: 16px 0;
    font-family: var(--font-code); font-size: 0.78rem; line-height: 1.7; tab-size: 4; font-variant-ligatures: none;
}
.os-gutter { padding: 0 14px 0 16px; text-align: right; color: rgba(255, 255, 255, 0.22); user-select: none; }
.os-gutter span { display: block; }
.os-code pre { margin: 0; padding: 0 20px 0 6px; color: #dcd9e2; white-space: pre; font: inherit; min-width: 0; }
.os-code code { font: inherit; }
.tk-kw { color: var(--tok-kw); }
.tk-str { color: var(--tok-str); }
.tk-num { color: var(--tok-num); }
.tk-com { color: var(--tok-com); font-style: italic; }
.tk-type { color: var(--tok-type); font-weight: 500; }
.tk-fn { color: var(--tok-fn); }
.os-empty { padding: 28px 20px; color: var(--os-muted); font-family: var(--font-code); font-size: 0.8rem; }

/* ─── Landing ─── */
.os-hero {
    display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(32px, 5vw, 72px); align-items: center;
    padding-top: clamp(56px, 8vw, 104px); padding-bottom: clamp(48px, 6vw, 80px);
}
.os-hero h1 { margin: 20px 0 18px; font-size: clamp(2.4rem, 5vw, 4rem); font-weight: 600; letter-spacing: -0.04em; line-height: 1.05; }
.os-lead { max-width: 44ch; color: var(--os-muted); font-size: clamp(1rem, 1.4vw, 1.1rem); line-height: 1.7; }
.os-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.os-hero .os-code-wrap { --os-code-max: 420px; }

.os-section { padding-bottom: clamp(56px, 8vw, 104px); }
.os-title {
    display: flex; align-items: center; gap: 14px; margin-bottom: 8px;
    font-family: var(--font-code); font-size: 0.74rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--os-muted);
}
.os-title::after { content: ""; flex: 1; height: 1px; background: var(--os-border); }

.os-rows { border-bottom: 1px solid var(--os-border); }
.os-row {
    display: grid; grid-template-columns: 32px 190px minmax(0, 1fr) 190px 150px; gap: 20px; align-items: center;
    padding: 24px 12px; border-top: 1px solid var(--os-border); margin: 0 -12px; border-radius: 10px;
    transition: background-color .25s var(--ease);
}
.os-row:hover { background: var(--os-surface); }
.os-row-idx { font-family: var(--font-code); font-size: 0.7rem; letter-spacing: 0.1em; color: var(--os-muted); }
.os-row h3 { font-size: 1.08rem; font-weight: 600; letter-spacing: -0.015em; }
.os-row p { color: var(--os-muted); font-size: 0.9rem; line-height: 1.6; }
.os-row-license { font-family: var(--font-code); font-size: 0.68rem; letter-spacing: 0.04em; color: var(--os-muted); line-height: 1.6; }
.os-row-license { display: flex; flex-direction: column; gap: 4px; }
.os-lic { width: fit-content; color: var(--os-text); font-weight: 600; border-bottom: 1px solid var(--os-border-strong); }
.os-lic:hover { color: var(--os-accent); border-bottom-color: currentColor; }
.os-tag-old { margin-right: 6px; color: #e6c691; border-color: rgba(230, 198, 145, 0.35); background: rgba(230, 198, 145, 0.06); }
.os-date { display: block; margin-top: 8px; font-family: var(--font-code); font-size: 0.68rem; letter-spacing: 0.02em; color: var(--os-muted); }
.os-note { display: block; margin-top: 6px; font-family: var(--font-code); font-size: 0.68rem; line-height: 1.5; color: #b79f73; }
.os-row-links { display: flex; gap: 16px; justify-content: flex-end; white-space: nowrap; }
.os-row-links .arr { transition: transform .25s var(--ease); }
.os-row-links .os-link:hover .arr { transform: translateX(3px); }

/* ─── Source explorer ─── */
.os-head { padding-top: clamp(40px, 6vw, 72px); padding-bottom: clamp(24px, 3vw, 36px); }
.os-crumb { display: flex; align-items: center; gap: 10px; font-family: var(--font-code); font-size: 0.74rem; color: var(--os-muted); }
.os-crumb a:hover { color: var(--os-text); }
.os-crumb .sep { opacity: .4; }
.os-crumb .cur { color: var(--os-text); }
.os-head h1 { margin: 18px 0 12px; font-size: clamp(2rem, 4.4vw, 3.1rem); font-weight: 600; letter-spacing: -0.035em; line-height: 1.08; }
.os-head .os-lead { max-width: 62ch; }
.os-head-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }

.os-explorer {
    display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 20px; align-items: start;
    padding-bottom: clamp(56px, 8vw, 104px);
}
.os-side {
    position: sticky; top: 84px; display: flex; flex-direction: column; max-height: calc(100vh - 108px);
    border: 1px solid var(--os-border); border-radius: var(--os-radius); background: var(--os-surface); overflow: hidden;
}
.os-search {
    width: 100%; padding: 13px 16px; background: transparent; border: 0; border-bottom: 1px solid var(--os-border);
    color: var(--os-text); font-family: var(--font-code); font-size: 0.76rem; outline: none;
}
.os-search::placeholder { color: var(--os-muted); }
.os-search:focus { background: var(--os-surface); }
.os-files { overflow-y: auto; padding: 8px; scrollbar-width: thin; scrollbar-color: rgba(255,255,255,.16) transparent; }
.os-group { padding: 12px 10px 6px; font-family: var(--font-code); font-size: 0.62rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--os-muted); }
.os-file {
    display: block; width: 100%; padding: 9px 10px; border: 0; border-radius: 8px; background: none; cursor: pointer; text-align: left;
    font-family: var(--font-code); font-size: 0.76rem; color: rgba(242, 240, 245, 0.72); word-break: break-all;
    transition: background-color .2s var(--ease), color .2s var(--ease);
}
.os-file:hover { background: var(--os-surface-2); color: var(--os-text); }
.os-file[aria-current="true"] { background: rgba(255, 255, 255, 0.075); color: var(--os-text); box-shadow: inset 2px 0 0 var(--os-accent); }
.os-none { padding: 18px 12px; font-family: var(--font-code); font-size: 0.74rem; color: var(--os-muted); }

.os-main { min-width: 0; display: flex; flex-direction: column; gap: 14px; }
.os-desc { padding: 0 4px; color: var(--os-muted); font-size: 0.92rem; line-height: 1.65; }
.os-explorer .os-code-wrap { --os-code-max: calc(100vh - 220px); min-height: 240px; }

.os-explorer.os-single { grid-template-columns: minmax(0, 1fr); }
.os-explorer.os-single .os-side { display: none; }

@media (max-width: 960px) {
    .os-hero { grid-template-columns: minmax(0, 1fr); }
    .os-row { grid-template-columns: 32px minmax(0, 1fr) auto; gap: 8px 14px; }
    .os-row p { grid-column: 2 / -1; grid-row: 2; }
    .os-row-license { grid-column: 2; grid-row: 3; }
    .os-row-links { grid-column: 3; grid-row: 3; }
    .os-explorer { grid-template-columns: minmax(0, 1fr); }
    .os-side { position: static; max-height: 280px; }
    .os-explorer .os-code-wrap { --os-code-max: 70vh; }
}
@media (max-width: 560px) {
    .os-row { grid-template-columns: minmax(0, 1fr); }
    .os-row-idx { display: none; }
    .os-row > *, .os-row p, .os-row-license, .os-row-links { grid-column: 1; grid-row: auto; }
    .os-row-links { justify-content: flex-start; }
    .os-code { font-size: 0.72rem; }
}