/* Shared styles: base layout, navigation, controls and components used by 2+ pages.
   Page-specific rules live in www/<demo>/style.css; the 原理说明 panel in www/explain.css. */

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

html {
    -webkit-tap-highlight-color: transparent;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    background: #0d1117;
    color: #c9d1d9;
    font-family: 'Segoe UI', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
    display: flex;
    justify-content: center;
    align-items: flex-start;     /* fallback: `safe` needs Safari 17.6+ */
    align-items: safe center;
    min-height: 100vh;
    min-height: 100dvh;          /* iOS: exclude the collapsing address bar */
    overflow-y: auto;
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
}

#container {
    text-align: center;
    max-width: 95vw;
}

h1 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #f0883e;
    margin-bottom: 0.25rem;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 0.9rem;
    color: #8b949e;
    margin-bottom: 1rem;
}

.subtitle strong {
    color: #f0883e;
}

/* ── Top navigation ──────────────────────────────── */
/* One 44px bar: home, the current category and its demos, and 全部示例, which opens a panel
   with every demo by category. Below 900px the bar shows only the current page's name. */

.top-nav {
    --nav-h: 44px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: calc(var(--nav-h) + env(safe-area-inset-top));
    padding: env(safe-area-inset-top) max(16px, env(safe-area-inset-right)) 0 max(16px, env(safe-area-inset-left));
    border-bottom: 1px solid #21262d;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    white-space: nowrap;
    z-index: 100;
}

/* Frosted background on a pseudo-element: backdrop-filter on the nav itself would make it
   the containing block of its fixed children (the panel and its backdrop) */
.top-nav::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: -1;
    background: rgba(22, 27, 34, 0.92);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
}

.top-nav > * {
    flex: none;
}

.top-nav a {
    color: #c9d1d9;
    text-decoration: none;
    border-radius: 6px;
    transition: background 0.15s, color 0.15s;
}

.top-nav .nav-home {
    color: #8b949e;
    padding: 5px 8px;
    margin-left: -8px;
}

/* Current category, e.g. "图形渲染" */
.top-nav .nav-cat {
    padding: 2px 9px;
    border: 1px solid #30363d;
    border-radius: 999px;
    font-size: 0.72rem;
    color: #8b949e;
}

/* Current page name: only shown when the demo links don't fit */
.top-nav .nav-here {
    display: none;
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    color: #f0883e;
    font-weight: 600;
}

.top-nav .nav-siblings {
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    gap: 2px;
    overflow: hidden;
}

.top-nav .nav-siblings a {
    padding: 5px 10px;
}

.top-nav a[aria-current="page"] {
    color: #f0883e;
    background: rgba(240, 136, 62, 0.12);
    font-weight: 600;
    cursor: default;
}

/* 全部示例: a <details>, so the panel opens without script */
.top-nav .nav-all > summary {
    list-style: none;
    cursor: pointer;
    padding: 5px 12px;
    border: 1px solid #30363d;
    border-radius: 6px;
    color: #c9d1d9;
    user-select: none;
}

.top-nav .nav-all > summary::-webkit-details-marker {
    display: none;
}

.top-nav .nav-all > summary::after {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    margin: 0 0 3px 8px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    transition: transform 0.15s;
}

.top-nav .nav-all[open] > summary {
    background: #21262d;
    border-color: #484f58;
}

.top-nav .nav-all[open] > summary::after {
    transform: translateY(3px) rotate(-135deg);
}

/* While open, a dimmed backdrop covers the page below the bar; clicking it clicks the
   summary and closes the panel, so the click never reaches a canvas underneath */
.top-nav .nav-all[open] > summary::before {
    content: '';
    position: fixed;
    inset: calc(var(--nav-h) + env(safe-area-inset-top)) 0 0 0;
    background: rgba(1, 4, 9, 0.55);
    cursor: default;
}

.top-nav .nav-panel {
    position: fixed;
    top: calc(var(--nav-h) + env(safe-area-inset-top));
    left: 0;
    right: 0;
    max-height: calc(100vh - var(--nav-h) - env(safe-area-inset-top));
    max-height: calc(100dvh - var(--nav-h) - env(safe-area-inset-top));
    overflow-y: auto;
    overscroll-behavior: contain;
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 20px 24px;
    padding: 20px max(24px, calc((100vw - 1240px) / 2)) max(24px, env(safe-area-inset-bottom));
    background: #161b22;
    border-bottom: 1px solid #30363d;
    box-shadow: 0 16px 32px rgba(1, 4, 9, 0.6);
    white-space: normal;
    text-align: left;
}

.top-nav .nav-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.top-nav .nav-group-title {
    font-size: 0.78rem;
    font-weight: 600;
    color: #8b949e;
    padding: 0 8px 8px;
    margin-bottom: 4px;
    border-bottom: 1px solid #21262d;
}

.top-nav .nav-group a {
    padding: 6px 8px;
}

@media (hover: hover) {
    .top-nav a:not([aria-current]):hover {
        color: #58a6ff;
        background: #21262d;
    }

    .top-nav .nav-all > summary:hover {
        border-color: #484f58;
    }
}

.top-nav a:focus-visible,
.top-nav summary:focus-visible {
    outline: 2px solid #58a6ff;
    outline-offset: 1px;
}

@media (max-width: 1100px) {
    .top-nav .nav-panel {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

/* Too narrow for the demo links: name the current page instead */
@media (max-width: 900px) {
    .top-nav .nav-siblings {
        display: none;
    }

    .top-nav .nav-here {
        display: block;
    }
}

@media (max-width: 560px) {
    .top-nav {
        gap: 8px;
    }

    .top-nav .nav-panel {
        gap: 16px 8px;
        padding: 14px max(10px, env(safe-area-inset-right)) max(16px, env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left));
    }

    .top-nav .nav-group-title {
        padding: 0 6px 6px;
        font-size: 0.74rem;
    }

    .top-nav .nav-group a {
        padding-left: 6px;
        padding-right: 6px;
    }
}

@media (max-width: 360px) {
    .top-nav .nav-cat {
        display: none;
    }

    .top-nav .nav-panel {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

body.has-nav {
    padding-top: 44px;
    padding-top: calc(44px + env(safe-area-inset-top));
}

/* ── Canvas (mandelbrot) ─────────────────────────── */

#canvas-wrapper {
    position: relative;
    display: inline-block;
    max-width: 100%;
    border: 2px solid #30363d;
    border-radius: 4px;
    overflow: hidden;
    line-height: 0;
}

canvas {
    display: block;
    cursor: grab;
}

/* Fixed-resolution canvases shrink to fit narrow screens (JS maps pointer coords) */
#canvas-wrapper canvas {
    max-width: 100%;
    height: auto;
}

canvas:active {
    cursor: grabbing;
}

#controls {
    margin-top: 0.75rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

/* ID selector above outranks .hidden, so hide explicitly */
#controls.hidden {
    display: none;
}

#reset-btn, button {
    background: #21262d;
    color: #c9d1d9;
    border: 1px solid #30363d;
    padding: 6px 18px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.15s;
}

@media (hover: hover) {
    #reset-btn:hover,
    button:hover {
        background: #30363d;
    }
}

#perf-info {
    font-size: 0.8rem;
    color: #8b949e;
    font-family: 'Cascadia Code', 'Fira Code', monospace;
}

.help {
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: #484f58;
}

.help code {
    background: #21262d;
    padding: 1px 5px;
    border-radius: 3px;
    font-size: 0.75rem;
}

/* ── Image filter ────────────────────────────────── */

#drop-zone {
    border: 2px dashed #30363d;
    border-radius: 8px;
    padding: 3rem;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    position: relative;
    max-width: 500px;
    margin: 0 auto;
}

#drop-zone.drag-over {
    border-color: #f0883e;
    background: #161b22;
}

@media (hover: hover) {
    #drop-zone:hover {
        border-color: #f0883e;
        background: #161b22;
    }
}

#drop-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

#drop-msg p {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.hidden {
    display: none;
}

.canvas-pair {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.canvas-box {
    border: 1px solid #30363d;
    border-radius: 4px;
    overflow: hidden;
}

.canvas-box h3 {
    font-size: 0.8rem;
    padding: 6px 12px;
    background: #161b22;
    color: #8b949e;
    border-bottom: 1px solid #30363d;
}

.canvas-box canvas {
    display: block;
}

.filter-btn {
    padding: 6px 14px;
}

.filter-btn.active {
    background: #f0883e;
    color: #0d1117;
    border-color: #f0883e;
}

@media (hover: hover) {
    .filter-btn.active:hover {
        background: #f0883e;
    }
}

/* ── Particles ──────────────────────────────────── */

.param-slider {
    font-size: 0.8rem;
    color: #8b949e;
    display: flex;
    align-items: center;
    gap: 4px;
}

.param-slider input[type="range"] {
    width: 80px;
    accent-color: #f0883e;
}

.param-slider span {
    color: #c9d1d9;
    min-width: 32px;
}

/* ── GPU Diagnostic ─────────────────────────────── */

.gpu-diag-panel {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 8px;
    padding: 1.5rem 2rem;
    max-width: 660px;
    margin: 1rem auto 0 auto;
    text-align: left;
    line-height: 1.6;
}

.gpu-diag-panel h3 {
    font-size: 1rem;
    color: #f0883e;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #30363d;
}

.gpu-diag-row {
    padding: 6px 0;
    font-size: 0.85rem;
    border-bottom: 1px solid #21262d;
}

.gpu-diag-row.ok { color: #7ee787; }
.gpu-diag-row.fail { color: #f85149; }

.gpu-diag-detail {
    display: block;
    color: #8b949e;
    font-size: 0.78rem;
    font-family: 'Cascadia Code', 'Fira Code', monospace;
    margin-top: 2px;
    padding-left: 30px;
    word-break: break-word;
    overflow-wrap: break-word;
    white-space: normal;
}

.gpu-diag-hint {
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid #30363d;
    font-size: 0.8rem;
    color: #8b949e;
    line-height: 1.7;
}

.gpu-diag-hint ul {
    list-style: disc;
    padding-left: 1.25rem;
    margin: 0.25rem 0 0 0;
}

.gpu-diag-hint li {
    margin: 4px 0;
}

.gpu-diag-hint code {
    background: #21262d;
    padding: 1px 5px;
    border-radius: 3px;
    font-size: 0.75rem;
}

.gpu-diag-summary {
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid #30363d;
    font-size: 0.9rem;
    font-weight: 600;
    text-align: center;
}

.gpu-diag-summary.ok { color: #7ee787; }
.gpu-diag-summary.fail { color: #f85149; }

pre.debug-raw {
    color: #8b949e;
    font-size: 0.7rem;
    text-align: left;
    padding: 0.75rem;
    margin-top: 0.75rem;
    background: #0d1117;
    border: 1px solid #30363d;
    border-radius: 4px;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 300px;
    overflow-y: auto;
}

/* ── Secondary control row & status line (pathfind, terrain, sha256) ── */

.sub-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.4rem 1rem;
    margin-top: 0.6rem;
    font-size: 0.85rem;
    color: #8b949e;
}

.sub-controls label { cursor: pointer; color: #c9d1d9; }
.sub-controls input { accent-color: #f0883e; }

.status-line {
    margin-top: 0.6rem;
    font-family: 'Cascadia Code', 'Fira Code', monospace;
    font-size: 0.8rem;
    color: #8b949e;
}

/* ── Touch devices ───────────────────────────────── */

@media (pointer: coarse) {
    /* iOS zooms the whole page when focusing a control whose font is < 16px */
    input,
    select,
    textarea {
        font-size: 16px;
    }

    /* Finger-sized targets (~44px) */
    button,
    #reset-btn {
        min-height: 44px;
        padding: 8px 18px;
    }

    button:active,
    #reset-btn:active {
        background: #30363d;
        transform: scale(0.97);
    }

    select {
        min-height: 36px;
    }

    input[type="range"] {
        height: 28px;
    }

    /* Finger-sized nav targets: the bar keeps its height, the panel's rows grow */
    .top-nav .nav-siblings a,
    .top-nav .nav-home,
    .top-nav .nav-all > summary {
        padding-top: 9px;
        padding-bottom: 9px;
    }

    .top-nav .nav-group a {
        padding: 11px 8px;
    }
}

/* ── Benchmark result table (benchmark, simd) — .js = baseline column, .wasm = contender ── */

.bench-table {
    width: 880px;
    max-width: 100%;
    margin: 1rem auto 0;
    border: 1px solid #30363d;
    border-radius: 8px;
    overflow: hidden;
    text-align: left;
}

.bench-row {
    display: grid;
    grid-template-columns: 2.2fr 1fr 1fr 1.3fr 1fr;
    grid-template-areas: "name js wasm ratio check" "bars bars bars bars bars" "detail detail detail detail detail";
    align-items: center;
    column-gap: 0.75rem;
    padding: 0.7rem 1rem;
    border-top: 1px solid #21262d;
    font-size: 0.88rem;
}

.bench-row.bench-head {
    grid-template-areas: none;
    border-top: none;
    background: #161b22;
    font-size: 0.78rem;
    font-weight: 600;
    color: #8b949e;
}

.bench-row.running { background: rgba(240, 136, 62, 0.06); }
.bench-name { grid-area: name; display: flex; flex-direction: column; }
.bench-name small { color: #8b949e; font-size: 0.75rem; }
.bench-ms { font-family: 'Cascadia Code', 'Fira Code', monospace; font-size: 0.82rem; }
.bench-ms.js { grid-area: js; color: #e3b341; }
.bench-ms.wasm { grid-area: wasm; color: #f0883e; }
.bench-ratio { grid-area: ratio; font-weight: 600; }
.bench-ratio.wasm { color: #f0883e; }
.bench-ratio.js { color: #e3b341; }
.bench-check { grid-area: check; font-size: 0.8rem; cursor: pointer; }
.bench-check.ok::after, .bench-check.fail::after { content: ' ▾'; color: #8b949e; }
.bench-row.show-detail .bench-check::after { content: ' ▴'; }

.bench-detail {
    grid-area: detail;
    display: none;
    margin-top: 0.4rem;
    font-family: 'Cascadia Code', 'Fira Code', monospace;
    font-size: 0.75rem;
    color: #8b949e;
    word-break: break-all;
}
.bench-row.show-detail .bench-detail { display: block; }
.bench-check.ok { color: #3fb950; }
.bench-check.fail { color: #f85149; }

.bench-bars {
    grid-area: bars;
    display: flex;
    flex-direction: column;
    gap: 3px;
    margin-top: 0.5rem;
}

.bench-bars .bar {
    display: block;
    height: 6px;
    width: 100%;
    border-radius: 3px;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.bench-bars .bar.js { background: #e3b341; }
.bench-bars .bar.wasm { background: #f0883e; }

@media (max-width: 600px) {
    .bench-row {
        grid-template-columns: 1fr 1fr 1fr;
        grid-template-areas: "name name name" "js wasm check" "ratio ratio ratio" "bars bars bars" "detail detail detail";
        row-gap: 0.25rem;
    }
    .bench-row.bench-head { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    .bench-bars .bar { transition: none; }
}

/* Keyboard keys in help text (synth, chip8) */
kbd {
    padding: 0 0.3em;
    border: 1px solid #30363d;
    border-radius: 4px;
    font-size: 0.85em;
}