:root {
            --fw-bg: #0a0d14;
            --fw-panel: #101521;
            --fw-panel-2: #0d1220;
            --fw-border: rgba(255, 255, 255, 0.08);
            --fw-border-hover: rgba(125, 211, 252, 0.35);
            --fw-ink: #e6eaf2;
            --fw-ink-2: #a8b0c2;
            --fw-ink-3: #6b7488;
            --fw-accent: #7dd3fc;
            --fw-accent-dim: rgba(125, 211, 252, 0.12);
            --fw-warn: #fbbf24;
            --fw-warn-dim: rgba(251, 191, 36, 0.12);
            --fw-ok: #4ade80;
            --fw-ok-dim: rgba(74, 222, 128, 0.10);
            --fw-bad: #f87171;
            --fw-bad-dim: rgba(248, 113, 113, 0.10);
        }

        .fw { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

        /* Dark backdrop so text stays readable on any shader theme */
        body[data-page="firmware"]::before {
            content: '';
            position: fixed;
            inset: 0;
            background: rgba(10, 13, 20, 0.72);
            z-index: 0;
            pointer-events: none;
        }
        body[data-page="firmware"] > * { position: relative; z-index: 1; }

        .fw-hero { padding: 80px 24px 48px; max-width: 960px; margin: 0 auto; }
        .fw-hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
        @media (max-width: 860px) { .fw-hero-inner { grid-template-columns: 1fr; } }

        .fw-eyebrow {
            display: inline-block; padding: 4px 10px; border-radius: 4px;
            background: var(--fw-accent-dim); border: 1px solid rgba(125, 211, 252, 0.25);
            color: var(--fw-accent); font-family: 'JetBrains Mono', monospace;
            font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase;
            margin-bottom: 20px;
        }
        .fw-hero h1 {
            font-size: clamp(1.8rem, 3.5vw, 2.4rem); font-weight: 700;
            letter-spacing: -0.015em; line-height: 1.2; margin-bottom: 16px;
            color: var(--fw-ink);
            text-shadow: 0 1px 4px rgba(0,0,0,0.7), 0 0 24px rgba(0,0,0,0.4);
        }
        .fw-hero .sub {
            color: var(--fw-ink-2); line-height: 1.75; font-size: 0.95rem;
            margin-bottom: 24px;
            text-shadow: 0 1px 3px rgba(0,0,0,0.6);
        }
        .fw-hero-tags { display: flex; flex-wrap: wrap; gap: 6px; }
        .fw-tag {
            padding: 4px 10px; border-radius: 3px;
            background: rgba(255, 255, 255, 0.04); border: 1px solid var(--fw-border);
            color: var(--fw-ink-2); font-size: 0.72rem; font-family: 'JetBrains Mono', monospace;
        }

        .fw-chip-viz svg { width: 100%; height: auto; max-width: 420px; display: block; }

        .fw-section { margin: 64px 0; }
        .fw-section-head {
            margin-bottom: 24px; display: flex; align-items: baseline; gap: 16px;
            flex-wrap: wrap; padding-bottom: 12px; border-bottom: 1px solid var(--fw-border);
        }
        .fw-section-num {
            font-family: 'JetBrains Mono', monospace; color: var(--fw-accent);
            font-size: 0.78rem; letter-spacing: 0.15em;
        }
        .fw-section h2 {
            font-size: 1.3rem; letter-spacing: -0.01em; font-weight: 600;
            color: var(--fw-ink);
        }
        .fw-section .note {
            color: var(--fw-ink-3); font-size: 0.76rem; margin-left: auto;
            font-family: 'JetBrains Mono', monospace;
        }

        .fw-specgrid {
            display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 12px;
        }
        .fw-spec {
            padding: 18px 20px; border-radius: 6px;
            background: var(--fw-panel); border: 1px solid var(--fw-border);
            transition: border-color 0.2s ease;
        }
        .fw-spec:hover { border-color: var(--fw-border-hover); }
        .fw-spec .lbl {
            font-family: 'JetBrains Mono', monospace; font-size: 0.68rem;
            letter-spacing: 0.12em; color: var(--fw-ink-3); text-transform: uppercase;
            margin-bottom: 8px;
        }
        .fw-spec .val {
            font-family: 'JetBrains Mono', monospace; font-size: 1rem;
            font-weight: 600; color: var(--fw-ink); line-height: 1.3;
        }
        .fw-spec .sub {
            font-size: 0.78rem; color: var(--fw-ink-2); margin-top: 4px;
            font-family: 'JetBrains Mono', monospace;
        }

        /* Interactive budget calculator */
        .fw-calc {
            padding: 24px; border-radius: 6px;
            background: var(--fw-panel); border: 1px solid var(--fw-border);
        }
        .fw-calc-grid {
            display: grid; grid-template-columns: 1fr 1fr; gap: 32px;
        }
        @media (max-width: 760px) { .fw-calc-grid { grid-template-columns: 1fr; } }
        .fw-calc-inputs { display: flex; flex-direction: column; gap: 18px; }
        .fw-calc-field label {
            display: flex; justify-content: space-between; align-items: baseline;
            font-family: 'JetBrains Mono', monospace; font-size: 0.76rem;
            color: var(--fw-ink-2); margin-bottom: 6px;
        }
        .fw-calc-field label b {
            color: var(--fw-accent); font-weight: 600;
        }
        .fw-calc-field input[type="range"] {
            width: 100%; accent-color: var(--fw-accent);
            background: transparent;
        }
        .fw-calc-field select {
            width: 100%; padding: 8px 12px; border-radius: 4px;
            background: var(--fw-panel-2); border: 1px solid var(--fw-border);
            color: var(--fw-ink); font-family: 'JetBrains Mono', monospace;
            font-size: 0.82rem;
        }
        .fw-calc-output { display: flex; flex-direction: column; gap: 10px; }
        .fw-calc-row {
            display: flex; align-items: center; gap: 12px;
            padding: 8px 0; border-bottom: 1px dashed rgba(255, 255, 255, 0.06);
        }
        .fw-calc-row:last-of-type { border: none; }
        .fw-calc-row .name {
            min-width: 130px; font-family: 'JetBrains Mono', monospace;
            font-size: 0.78rem; color: var(--fw-ink-2);
        }
        .fw-calc-row .bar {
            flex: 1; height: 8px; background: rgba(255, 255, 255, 0.04);
            border-radius: 2px; overflow: hidden; border: 1px solid var(--fw-border);
        }
        .fw-calc-row .fill {
            display: block; height: 100%; background: var(--fw-accent);
            transition: width 0.25s ease, background 0.25s ease;
        }
        .fw-calc-row .pct {
            min-width: 120px; text-align: right; font-family: 'JetBrains Mono', monospace;
            font-size: 0.78rem; color: var(--fw-ink);
        }
        .fw-calc-verdict {
            margin-top: 16px; padding: 12px 16px; border-radius: 4px;
            font-family: 'JetBrains Mono', monospace; font-size: 0.82rem;
            border-left: 2px solid;
        }
        .fw-calc-verdict.ok {
            background: var(--fw-ok-dim); border-left-color: var(--fw-ok); color: var(--fw-ok);
        }
        .fw-calc-verdict.warn {
            background: var(--fw-warn-dim); border-left-color: var(--fw-warn); color: var(--fw-warn);
        }
        .fw-calc-verdict.bad {
            background: var(--fw-bad-dim); border-left-color: var(--fw-bad); color: var(--fw-bad);
        }

        /* Code */
        .fw-code-wrap {
            border-radius: 6px; border: 1px solid var(--fw-border);
            background: var(--fw-panel-2); overflow: hidden; margin: 12px 0;
        }
        .fw-code-bar {
            display: flex; align-items: center; padding: 10px 14px;
            background: rgba(255, 255, 255, 0.02); border-bottom: 1px solid var(--fw-border);
            font-family: 'JetBrains Mono', monospace; font-size: 0.76rem;
            color: var(--fw-ink-3);
        }
        .fw-code {
            font-family: 'JetBrains Mono', monospace; font-size: 0.84rem;
            padding: 18px 22px; overflow-x: auto; color: var(--fw-ink);
            line-height: 1.7; white-space: pre; margin: 0;
        }
        .fw-code .c-key { color: #c586c0; }
        .fw-code .c-type { color: #4ec9b0; }
        .fw-code .c-fn { color: #dcdcaa; }
        .fw-code .c-num { color: #b5cea8; }
        .fw-code .c-str { color: #ce9178; }
        .fw-code .c-cm { color: #6a9955; font-style: italic; }

        /* Timing viewer */
        .fw-timing {
            padding: 24px; border-radius: 6px;
            background: var(--fw-panel); border: 1px solid var(--fw-border);
        }
        .fw-timing-head {
            display: flex; justify-content: space-between; align-items: center;
            margin-bottom: 16px; flex-wrap: wrap; gap: 12px;
        }
        .fw-timing-title {
            font-family: 'JetBrains Mono', monospace; font-size: 0.82rem;
            color: var(--fw-ink-2);
        }
        .fw-timing-toggle {
            display: inline-flex; border: 1px solid var(--fw-border);
            border-radius: 4px; overflow: hidden;
        }
        .fw-timing-toggle button {
            padding: 6px 14px; background: var(--fw-panel-2);
            border: none; color: var(--fw-ink-2); cursor: pointer;
            font-family: 'JetBrains Mono', monospace; font-size: 0.76rem;
            transition: background 0.15s, color 0.15s;
        }
        .fw-timing-toggle button:not(:last-child) { border-right: 1px solid var(--fw-border); }
        .fw-timing-toggle button.active { background: var(--fw-accent-dim); color: var(--fw-accent); }
        .fw-timing-toggle button:not(.active):hover { color: var(--fw-ink); }
        #fw-timing-svg { width: 100%; height: auto; background: var(--fw-panel-2); border-radius: 4px; }
        .fw-timing-readout {
            margin-top: 14px; display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 8px 16px; font-family: 'JetBrains Mono', monospace; font-size: 0.78rem;
        }
        .fw-timing-readout .k { color: var(--fw-ink-3); }
        .fw-timing-readout .v { color: var(--fw-ink); }
        .fw-timing-readout .v.good { color: var(--fw-ok); }
        .fw-timing-readout .v.bad { color: var(--fw-bad); }

        /* Pipeline */
        .fw-pipe {
            display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
            gap: 10px; counter-reset: step;
        }
        .fw-step {
            position: relative; padding: 16px 18px 16px 48px; border-radius: 4px;
            background: var(--fw-panel); border: 1px solid var(--fw-border);
            counter-increment: step;
        }
        .fw-step::before {
            content: counter(step, decimal-leading-zero); position: absolute;
            left: 16px; top: 16px; font-family: 'JetBrains Mono', monospace;
            font-size: 0.74rem; font-weight: 600; color: var(--fw-accent);
            letter-spacing: 0.08em;
        }
        .fw-step .t {
            font-size: 0.92rem; font-weight: 600; color: var(--fw-ink);
            margin-bottom: 4px;
        }
        .fw-step .d { font-size: 0.78rem; color: var(--fw-ink-2); line-height: 1.55; }

        /* Diff cards */
        .fw-diff {
            display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 12px;
        }
        .fw-diff-card {
            padding: 18px 20px; border-radius: 4px; background: var(--fw-panel);
            border: 1px solid var(--fw-border); border-left: 2px solid var(--fw-warn);
        }
        .fw-diff-card.solve { border-left-color: var(--fw-ok); }
        .fw-diff-card .tag {
            display: inline-block; font-family: 'JetBrains Mono', monospace;
            font-size: 0.66rem; letter-spacing: 0.14em; text-transform: uppercase;
            color: var(--fw-warn); margin-bottom: 6px;
        }
        .fw-diff-card.solve .tag { color: var(--fw-ok); }
        .fw-diff-card .title {
            font-size: 0.9rem; font-weight: 600; color: var(--fw-ink);
            margin-bottom: 6px;
        }
        .fw-diff-card .desc { font-size: 0.82rem; color: var(--fw-ink-2); line-height: 1.65; }

        /* YouTube + articles */
        .fw-yt {
            position: relative; padding-bottom: 56.25%; height: 0;
            border-radius: 6px; overflow: hidden; background: #000;
            border: 1px solid var(--fw-border);
        }
        .fw-yt iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

        .fw-articles a {
            display: flex; align-items: center; gap: 14px;
            padding: 14px 18px; margin-bottom: 8px; border-radius: 4px;
            background: var(--fw-panel); border: 1px solid var(--fw-border);
            text-decoration: none; color: inherit;
            transition: border-color 0.2s, transform 0.2s;
        }
        .fw-articles a:hover { border-color: var(--fw-border-hover); transform: translateX(2px); }
        .fw-articles .bullet {
            color: var(--fw-accent); font-family: 'JetBrains Mono', monospace;
            font-size: 0.78rem; flex-shrink: 0;
        }
        .fw-articles .title { flex: 1; font-size: 0.9rem; color: var(--fw-ink); }
        .fw-articles .arrow { color: var(--fw-ink-3); font-family: 'JetBrains Mono', monospace; }

        .fw-callout {
            padding: 22px 24px; border-radius: 6px;
            background: var(--fw-panel-2); border: 1px solid var(--fw-border);
            border-left: 2px solid var(--fw-accent);
        }
        .fw-callout .title {
            font-size: 0.96rem; font-weight: 600; color: var(--fw-ink);
            margin-bottom: 10px;
        }
        .fw-callout p {
            color: var(--fw-ink-2); line-height: 1.75; font-size: 0.9rem; margin: 0;
        }
        .fw-callout a { color: var(--fw-accent); text-decoration: none; border-bottom: 1px dashed currentColor; }