/* =========================================================================
   Quantization & Local LLMs — interactive educational tool
   Dark TechTools house style (indigo / violet / electric cyan).
   Mobile-first. No framework. Shares the how-ai-works / rag-vectors shell,
   adds widgets: RAM calculator, weight-rounding, float bits, MoE router,
   memory-bandwidth, language tokenizer, format/library cards.
   ========================================================================= */

:root {
    /* Seed the shared navbar height (published live by tt-navbar.js) */
    --tt-topnav-h: 64px;

    --bg:        #07070b;
    --bg-2:      #0e0e15;
    --panel:     #14141d;
    --panel-2:   #1a1a26;
    --inset:     #101019;
    --border:    rgba(255, 255, 255, 0.09);
    --border-2:  rgba(255, 255, 255, 0.14);

    --text:      #f3f4f8;
    --text-2:    rgba(243, 244, 248, 0.72);
    --text-3:    rgba(243, 244, 248, 0.48);

    --indigo:    #6366f1;
    --violet:    #8b5cf6;
    --green:     #22c55e;
    --amber:     #f59e0b;
    --cyan:      #06b6d4;
    --pink:      #d946ef;
    --red:       #f87171;
    --sky:       #38bdf8;

    --grad:      linear-gradient(135deg, #818cf8 0%, #22d3ee 52%, #c084fc 100%);
    --grad-acc:  linear-gradient(135deg, var(--indigo), var(--violet));

    --r-sm: 8px;
    --r-md: 14px;
    --r-lg: 20px;
    --r-xl: 26px;

    --sp: 1rem;
    --maxw: 1080px;

    --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
    --shadow: 0 18px 50px -20px rgba(0, 0, 0, 0.7);
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--tt-topnav-h) + 64px); }

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background:
        radial-gradient(1100px 620px at 82% -8%, rgba(34, 211, 238, 0.12), transparent 60%),
        radial-gradient(900px 560px at 4% 2%, rgba(99, 102, 241, 0.14), transparent 58%),
        radial-gradient(1000px 700px at 50% 120%, rgba(139, 92, 246, 0.10), transparent 60%),
        var(--bg);
    color: var(--text);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: clip; /* never break position:sticky (navbar-v2 lesson) */
}

h1, h2, h3, h4 { line-height: 1.2; margin: 0; letter-spacing: -0.02em; }
p { margin: 0; }
a { color: inherit; }
code { font-family: var(--mono); font-size: 0.88em; }
.grad {
    background: var(--grad);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent; color: transparent;
}
.nowrap { white-space: nowrap; }

/* Dark-theme <option>s never inherit the select background — set explicitly
   (literal hex). Recurring white-on-white bug; do NOT remove. */
select option { background-color: #1a1a24; color: #ffffff; }

/* ===================== HERO ===================== */
.hero {
    position: relative;
    padding: clamp(2.6rem, 7vw, 5.2rem) 1.1rem clamp(1.4rem, 4vw, 2.4rem);
    text-align: center;
    overflow: hidden;
}
.hero-inner { max-width: 880px; margin: 0 auto; position: relative; z-index: 1; }
.hero-grid {
    position: absolute; inset: 0; z-index: 0; pointer-events: none; opacity: 0.5;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.10) 1px, transparent 1px),
        linear-gradient(90deg, rgba(34, 211, 238, 0.10) 1px, transparent 1px);
    background-size: 34px 34px;
    -webkit-mask-image: radial-gradient(closest-side at 50% 30%, #000 35%, transparent 78%);
    mask-image: radial-gradient(closest-side at 50% 30%, #000 35%, transparent 78%);
}
.hero-eyebrow {
    display: inline-flex; align-items: center; gap: 0.5rem;
    font-size: 0.78rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase;
    color: #a5f3fc;
    padding: 0.4rem 0.9rem; border-radius: 999px;
    background: rgba(34, 211, 238, 0.10);
    border: 1px solid rgba(34, 211, 238, 0.30);
}
.hero-title { font-size: clamp(2.15rem, 7.6vw, 4rem); font-weight: 900; margin: 1.1rem 0 0.9rem; }
.hero-sub { font-size: clamp(1rem, 2.6vw, 1.2rem); color: var(--text-2); max-width: 720px; margin: 0 auto; }
.hero-chips { list-style: none; padding: 0; margin: 1.6rem 0 0; display: flex; flex-wrap: wrap; gap: 0.55rem; justify-content: center; }
.hero-chips li {
    display: inline-flex; align-items: center; gap: 0.45rem;
    font-size: 0.86rem; font-weight: 600; color: var(--text-2);
    padding: 0.45rem 0.85rem; border-radius: 999px;
    background: var(--panel); border: 1px solid var(--border);
}
.hero-chips i { color: var(--cyan); }
.hero-hint { margin-top: 1.6rem; font-size: 0.92rem; color: var(--text-3); display: inline-flex; align-items: center; gap: 0.5rem; }
.hero-hint i { color: var(--amber); }

/* ===================== SECTION NAV ===================== */
.section-nav {
    position: sticky; top: var(--tt-topnav-h); z-index: 90;
    background: rgba(7, 7, 11, 0.84);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.section-nav-inner {
    max-width: var(--maxw); margin: 0 auto;
    display: flex; gap: 0.4rem; padding: 0.6rem 0.8rem;
    overflow-x: auto; scrollbar-width: none; -ms-overflow-style: none;
    scroll-snap-type: x proximity;
}
.section-nav-inner::-webkit-scrollbar { display: none; }
.sec-chip {
    flex: 0 0 auto; scroll-snap-align: start;
    text-decoration: none; white-space: nowrap;
    font-size: 0.85rem; font-weight: 600; color: var(--text-2);
    padding: 0.45rem 0.85rem; border-radius: 999px; border: 1px solid transparent;
    transition: color 0.18s, background 0.18s, border-color 0.18s;
}
.sec-chip:hover { color: var(--text); background: var(--panel); }
.sec-chip.active { color: #fff; background: rgba(34, 211, 238, 0.14); border-color: rgba(34, 211, 238, 0.45); }

/* ===================== DOC LAYOUT ===================== */
.doc { max-width: var(--maxw); margin: 0 auto; padding: 1rem 1.1rem 4rem; }
.sec { padding: clamp(2.2rem, 6vw, 3.6rem) 0; border-bottom: 1px solid var(--border); }
.sec:last-of-type { border-bottom: none; }
.sec-head { margin-bottom: 1.4rem; }
.sec-kicker { display: inline-block; font-size: 0.74rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--cyan); margin-bottom: 0.5rem; }
.sec-head h2 { font-size: clamp(1.5rem, 4.4vw, 2.15rem); font-weight: 800; }

.prose { font-size: 1.04rem; color: var(--text-2); max-width: 760px; }
.prose p + p { margin-top: 0.9rem; }
.prose strong, .prose-note strong, .mini-card strong, .recap-list strong, .callout strong { color: var(--text); font-weight: 700; }
.prose em, .mini-card em, .callout em, .block-sub em { color: #a5f3fc; font-style: italic; }
.prose code, .prose-note code, .mini-card code, .info-card code, .recap-list code, .block-sub code, .callout code {
    background: rgba(255, 255, 255, 0.06); border: 1px solid var(--border);
    padding: 0.08em 0.4em; border-radius: 6px; color: #cffafe;
}
.block-h { font-size: 1.18rem; font-weight: 700; margin: 2rem 0 0.4rem; }
.block-sub { font-size: 0.98rem; color: var(--text-2); margin-bottom: 1.1rem; max-width: 760px; }

/* ===================== CARDS / CALLOUT / TWO-COL ===================== */
.two-col { display: grid; grid-template-columns: 1fr; gap: 0.9rem; margin-top: 1.4rem; }
.mini-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-md); padding: 1.15rem 1.2rem; }
.mini-card h4 { font-size: 1rem; margin-bottom: 0.45rem; display: flex; align-items: center; gap: 0.5rem; }
.mini-card h4 i { color: var(--cyan); }
.mini-card p { font-size: 0.94rem; color: var(--text-2); }

.callout { display: flex; gap: 1rem; align-items: flex-start; margin-top: 1.6rem; padding: 1.2rem 1.3rem; background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-md); }
.callout.warn { background: rgba(245, 158, 11, 0.07); border-color: rgba(245, 158, 11, 0.32); }
.callout.tip  { background: rgba(34, 211, 238, 0.07); border-color: rgba(34, 211, 238, 0.30); }
.callout-ico { font-size: 1.3rem; color: var(--indigo); flex: 0 0 auto; margin-top: 0.15rem; }
.callout.warn .callout-ico { color: var(--amber); }
.callout.tip .callout-ico { color: var(--cyan); }
.callout h4 { font-size: 1.02rem; margin-bottom: 0.3rem; }
.callout p { font-size: 0.95rem; color: var(--text-2); }

.info-card .eg b { color: var(--text-2); font-weight: 600; }
.ic-ico { width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; font-size: 1.05rem; background: rgba(99, 102, 241, 0.14); color: #a5b4fc; border: 1px solid rgba(99, 102, 241, 0.3); }

/* ===================== WIDGET SHELL ===================== */
.widget {
    margin: 1.2rem 0 0.4rem;
    background: linear-gradient(180deg, var(--panel) 0%, var(--bg-2) 100%);
    border: 1px solid var(--border-2); border-radius: var(--r-lg);
    padding: 1.1rem; box-shadow: var(--shadow);
}
.widget.bare { background: none; border: none; box-shadow: none; padding: 0; }
.widget-cap { font-size: 0.86rem; color: var(--text-3); margin-bottom: 0.9rem; display: flex; align-items: center; gap: 0.45rem; }
.widget-cap i { color: var(--amber); }

.seg {
    display: inline-flex; align-items: center; gap: 0.45rem;
    font-family: inherit; font-size: 0.88rem; font-weight: 600;
    color: var(--text-2); cursor: pointer;
    background: var(--inset); border: 1px solid var(--border);
    border-radius: 999px; padding: 0.5rem 0.95rem;
    transition: all 0.18s var(--ease); min-height: 44px;
}
.seg:hover { color: var(--text); border-color: var(--border-2); }
.seg.active { color: #fff; background: var(--grad-acc); border-color: transparent; box-shadow: 0 6px 18px -8px var(--indigo); }
.seg small { font-weight: 500; opacity: 0.7; font-size: 0.72rem; }

.btn-mini {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
    font-family: inherit; font-weight: 600; cursor: pointer; border-radius: 999px; min-height: 44px;
    font-size: 0.84rem; color: var(--text-2);
    background: var(--inset); border: 1px solid var(--border); padding: 0.5rem 0.9rem;
    transition: transform 0.15s, box-shadow 0.2s, border-color 0.15s, background 0.15s, color 0.15s;
}
.btn-mini:hover { color: #fff; border-color: var(--border-2); }
.btn-mini.primary { color: #fff; background: var(--grad-acc); border-color: transparent; box-shadow: 0 6px 18px -10px var(--indigo); }
.btn-mini.primary:hover { transform: translateY(-2px); }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }

/* ===================== SHARED RANGE SLIDER ===================== */
.rng {
    -webkit-appearance: none; appearance: none; width: 100%; height: 8px; border-radius: 999px;
    background: linear-gradient(90deg, var(--cyan), var(--violet)); outline: none; margin: 0.2rem 0 0;
}
.rng::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 26px; height: 26px; border-radius: 50%; background: #fff; border: 3px solid var(--violet); cursor: pointer; box-shadow: 0 2px 8px rgba(0,0,0,0.4); }
.rng::-moz-range-thumb { width: 26px; height: 26px; border-radius: 50%; background: #fff; border: 3px solid var(--violet); cursor: pointer; }
.rng:focus-visible { outline: 2px solid var(--violet); outline-offset: 4px; }

.sel {
    width: 100%; font-family: inherit; font-size: 0.92rem; font-weight: 600; color: var(--text);
    background: var(--inset); border: 1px solid var(--border); border-radius: var(--r-sm);
    padding: 0.6rem 0.8rem; cursor: pointer; min-height: 44px; margin-top: 0.3rem;
}
.sel:focus { outline: none; border-color: rgba(34,211,238,0.5); }

/* generic control block */
.ctl { display: flex; flex-direction: column; }
.ctl-head { display: flex; align-items: baseline; justify-content: space-between; gap: 0.6rem; }
.ctl-head label { font-size: 0.86rem; font-weight: 600; color: var(--text-2); }
.ctl-val { font-family: var(--mono); font-size: 0.82rem; color: var(--text-3); }
.ctl-val b { color: var(--cyan); font-size: 1.05rem; }
.ctl-sub { font-size: 0.78rem; color: var(--text-3); margin-top: 0.4rem; }

/* toggle switch */
.toggle { width: 46px; height: 26px; border-radius: 999px; background: var(--panel-2); border: 1px solid var(--border-2); position: relative; cursor: pointer; flex: 0 0 auto; padding: 0; transition: background 0.2s; }
.toggle-dot { position: absolute; top: 2px; left: 2px; width: 20px; height: 20px; border-radius: 50%; background: var(--text-3); transition: transform 0.2s, background 0.2s; }
.toggle[aria-checked="true"] { background: rgba(99,102,241,0.35); border-color: rgba(99,102,241,0.55); }
.toggle[aria-checked="true"] .toggle-dot { transform: translateX(20px); background: var(--indigo); }

/* ===================== CALCULATOR ===================== */
.calc-presets { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.2rem; }
.calc-preset {
    font-family: inherit; font-size: 0.82rem; font-weight: 600; cursor: pointer;
    color: var(--text-2); background: var(--inset); border: 1px solid var(--border);
    border-radius: 999px; padding: 0.5rem 0.9rem; min-height: 44px; transition: all 0.15s;
    display: inline-flex; flex-direction: column; align-items: flex-start; justify-content: center; line-height: 1.25;
}
.calc-preset small { font-family: var(--mono); font-weight: 500; font-size: 0.68rem; color: var(--text-3); }
.calc-preset:hover { color: #fff; border-color: var(--border-2); }
.calc-preset.active { border-color: rgba(34,211,238,0.5); background: rgba(34,211,238,0.10); }
.calc-preset.active small { color: #67e8f9; }

.calc-controls { display: grid; grid-template-columns: 1fr; gap: 1.3rem; }
.calc-controls .ctl-active { margin-top: 0.8rem; opacity: 1; transition: opacity 0.2s; }
.calc-controls.dense .ctl-active { opacity: 0.35; pointer-events: none; }

.calc-out { margin-top: 1.5rem; border-top: 1px solid var(--border); padding-top: 1.3rem; }
.calc-figs { display: grid; grid-template-columns: 1fr; gap: 0.7rem; }
.calc-fig, .bw-fig { background: var(--inset); border: 1px solid var(--border); border-radius: var(--r-md); padding: 0.9rem 1.1rem; display: flex; flex-direction: column; gap: 0.2rem; }
.calc-fig.accent, .bw-fig.accent { background: linear-gradient(160deg, rgba(34,211,238,0.13), rgba(139,92,246,0.07)); border-color: rgba(34,211,238,0.36); }
.cf-lbl { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-3); }
.cf-val { font-family: var(--mono); font-size: 1.55rem; font-weight: 800; color: var(--text); line-height: 1.1; }
.calc-fig.accent .cf-val, .bw-fig.accent .cf-val { color: #a5f3fc; }

.calc-fit { margin-top: 1.1rem; }
.fit-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.4rem; }
.fit-item {
    text-align: center; padding: 0.6rem 0.3rem; border-radius: var(--r-sm);
    border: 1px solid var(--border); background: var(--inset); color: var(--text-3);
    font-size: 0.7rem; font-weight: 600; display: flex; flex-direction: column; align-items: center; gap: 0.3rem;
    transition: all 0.2s;
}
.fit-item i { font-size: 1.1rem; }
.fit-item.on { color: #fff; border-color: rgba(34,197,94,0.5); background: rgba(34,197,94,0.13); }
.fit-item.on i { color: var(--green); }
.fit-item.target { border-color: rgba(34,211,238,0.6); box-shadow: 0 0 0 1px rgba(34,211,238,0.4) inset; }
.fit-item.target i { color: #67e8f9; }

.calc-break { margin-top: 1.1rem; font-size: 0.9rem; color: var(--text-2); padding: 0.8rem 1rem; border-radius: var(--r-sm); background: rgba(255,255,255,0.03); border: 1px solid var(--border); border-left: 3px solid var(--cyan); }
.calc-break b { color: var(--text); font-family: var(--mono); }
.calc-foot { margin-top: 1rem; font-size: 0.8rem; color: var(--text-3); }
.calc-foot i { color: var(--cyan); margin-right: 0.35rem; }
.calc-foot strong { color: var(--text-2); }

/* ===================== PARAMETER SCALE ===================== */
.ps-rows { display: flex; flex-direction: column; gap: 0.55rem; }
.ps-row {
    display: grid; grid-template-columns: minmax(96px, auto) 1fr minmax(70px, auto); align-items: center; gap: 0.8rem;
    background: var(--inset); border: 1px solid var(--border); border-radius: var(--r-sm);
    padding: 0.6rem 0.85rem; cursor: pointer; font-family: inherit; color: var(--text); text-align: left; width: 100%;
    transition: border-color 0.15s, transform 0.12s, background 0.15s;
}
.ps-row:hover { border-color: var(--border-2); transform: translateX(2px); }
.ps-row.active { border-color: rgba(34,211,238,0.45); background: rgba(34,211,238,0.08); }
.ps-row-name { font-weight: 700; font-size: 0.9rem; }
.ps-row-name small { display: block; font-family: var(--mono); font-weight: 500; font-size: 0.68rem; color: var(--text-3); }
.ps-row-track { height: 12px; border-radius: 999px; background: rgba(255,255,255,0.06); overflow: hidden; }
.ps-row-fill { height: 100%; border-radius: 999px; background: var(--grad-acc); width: 0; transition: width 0.5s var(--ease); }
.ps-row.active .ps-row-fill { background: linear-gradient(90deg, var(--cyan), var(--violet)); }
.ps-row-size { font-family: var(--mono); font-weight: 700; font-size: 0.85rem; color: var(--cyan); text-align: right; white-space: nowrap; }
.ps-note { font-size: 0.84rem; color: var(--text-3); margin-top: 1rem; }

/* ===================== QUANT ROUNDING ===================== */
.qr-grid { display: grid; grid-template-columns: 1fr; gap: 1.2rem; }
.qr-bitrow { display: flex; align-items: baseline; justify-content: space-between; }
.qr-bitrow label { font-size: 0.86rem; font-weight: 600; color: var(--text-2); }
.qr-bits-val { font-family: var(--mono); font-weight: 700; color: var(--amber); }
.qr-marks { display: flex; gap: 0.45rem; flex-wrap: wrap; margin-top: 0.7rem; }
.qr-mark { font-family: var(--mono); font-size: 0.76rem; font-weight: 600; cursor: pointer; color: var(--text-2); background: var(--inset); border: 1px solid var(--border); border-radius: 8px; padding: 0.4rem 0.65rem; min-height: 44px; transition: all 0.15s; }
.qr-mark:hover { color: #fff; border-color: var(--border-2); }
.qr-meters { display: flex; flex-direction: column; gap: 0.7rem; margin-top: 1.1rem; }
.qr-meter { display: grid; grid-template-columns: minmax(72px, auto) 1fr auto; align-items: center; gap: 0.7rem; }
.qm-lbl { font-size: 0.78rem; color: var(--text-2); }
.qm-track { height: 10px; border-radius: 999px; background: rgba(255,255,255,0.06); overflow: hidden; }
.qm-fill { height: 100%; border-radius: 999px; width: 100%; transition: width 0.35s var(--ease); }
.qm-size { background: linear-gradient(90deg, var(--cyan), var(--indigo)); }
.qm-qual { background: linear-gradient(90deg, var(--amber), var(--green)); }
.qm-pct { font-family: var(--mono); font-size: 0.78rem; color: var(--text-2); white-space: nowrap; min-width: 3rem; text-align: right; }
.qr-right { display: flex; flex-direction: column; }
.qr-cap { font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-3); margin-bottom: 0.5rem; }
.qr-canvas { width: 100%; height: auto; border-radius: var(--r-sm); border: 1px solid var(--border); image-rendering: pixelated; background: #000; display: block; }
.qr-weights { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 0.7rem; }
.qr-w { font-family: var(--mono); font-size: 0.72rem; padding: 0.18rem 0.4rem; border-radius: 5px; background: var(--inset); border: 1px solid var(--border); color: var(--text-2); }
.qr-w b { color: #67e8f9; font-weight: 700; }
.qr-verdict { margin-top: 1.1rem; font-size: 0.93rem; color: var(--text-2); min-height: 2.6em; padding: 0.75rem 0.95rem; border-radius: var(--r-sm); background: rgba(255,255,255,0.03); border: 1px solid var(--border); }
.qr-verdict b { color: var(--text); }

/* ===================== QUANT TABLE ===================== */
.qt-table { display: flex; flex-direction: column; gap: 0.4rem; }
.qt-row { display: grid; grid-template-columns: minmax(78px,0.7fr) 0.6fr 1.4fr minmax(86px,0.8fr); align-items: center; gap: 0.5rem 0.8rem; padding: 0.6rem 0.85rem; border-radius: var(--r-sm); background: var(--inset); border: 1px solid var(--border); font-size: 0.84rem; }
.qt-row.head { background: transparent; border-color: transparent; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-3); padding-bottom: 0; padding-top: 0; font-weight: 700; }
.qt-row.sweet { border-color: rgba(34,197,94,0.4); background: rgba(34,197,94,0.07); }
.qt-name { font-family: var(--mono); font-weight: 700; color: var(--text); }
.qt-bpw { font-family: var(--mono); color: var(--cyan); }
.qt-use { color: var(--text-2); font-size: 0.82rem; }
.qt-bar-wrap { display: none; }
.qt-tag { font-size: 0.66rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: #86efac; }

/* ===================== FLOAT BITS ===================== */
.fb-tabs { display: flex; gap: 0.5rem; margin-bottom: 1.1rem; flex-wrap: wrap; }
.fb-tabs .seg { font-family: var(--mono); }
.fb-bits { display: flex; flex-wrap: wrap; gap: 3px; align-items: flex-end; margin-bottom: 0.5rem; }
.fb-bit { width: 15px; height: 26px; border-radius: 3px; flex: 0 0 auto; transition: background 0.25s, height 0.25s; }
.fb-bit.sign { background: var(--pink); }
.fb-bit.exp  { background: var(--amber); }
.fb-bit.man  { background: var(--cyan); }
.fb-bit.off  { background: rgba(255,255,255,0.07); }
.fb-group-lbl { width: 100%; display: flex; gap: 0.4rem; margin-top: 0.3rem; font-size: 0.66rem; font-family: var(--mono); color: var(--text-3); flex-wrap: wrap; }
.fb-legend { display: flex; flex-wrap: wrap; gap: 0.5rem 1.1rem; margin: 0.8rem 0; }
.fb-key { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.78rem; color: var(--text-2); }
.fb-sw { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.fb-sw.fb-sign { background: var(--pink); }
.fb-sw.fb-exp { background: var(--amber); }
.fb-sw.fb-man { background: var(--cyan); }
.fb-readout { font-size: 0.92rem; color: var(--text-2); padding: 0.85rem 1rem; border-radius: var(--r-sm); background: var(--inset); border: 1px solid var(--border); }
.fb-readout b { color: var(--text); }
.fb-readout .pill { display: grid; grid-template-columns: auto 1fr; gap: 0.25rem 0.9rem; font-family: var(--mono); font-size: 0.8rem; margin-top: 0.7rem; padding-top: 0.6rem; border-top: 1px solid var(--border); }
.fb-readout .pill span:nth-child(odd) { color: var(--text-3); }
.fb-readout .pill span:nth-child(even) { color: #67e8f9; }

/* ===================== MoE ROUTER ===================== */
.mr-stage { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; margin-bottom: 1rem; }
.mr-token, .mr-router { display: inline-flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; font-weight: 600; padding: 0.55rem 0.9rem; border-radius: 999px; border: 1px solid var(--border); background: var(--inset); }
.mr-token { color: #fcd34d; border-color: rgba(245,158,11,0.4); }
.mr-token i { color: var(--amber); }
.mr-router { color: #c4b5fd; border-color: rgba(139,92,246,0.4); }
.mr-router i { color: var(--violet); }
.mr-arrow { color: var(--text-3); }
.mr-experts { display: grid; grid-template-columns: repeat(8, 1fr); gap: 6px; margin-bottom: 1.1rem; }
.mr-exp {
    aspect-ratio: 1; border-radius: var(--r-sm); background: var(--inset); border: 1px solid var(--border);
    display: grid; place-items: center; color: var(--text-3); font-size: 0.8rem;
    transition: background 0.3s, border-color 0.3s, color 0.3s, transform 0.3s, box-shadow 0.3s;
}
.mr-exp i { opacity: 0.5; }
.mr-exp.on { background: linear-gradient(160deg, rgba(34,197,94,0.25), rgba(34,211,238,0.12)); border-color: rgba(34,197,94,0.6); color: #86efac; box-shadow: 0 0 18px -6px rgba(34,197,94,0.7); transform: translateY(-2px); }
.mr-exp.on i { opacity: 1; }
.mr-exp.scoring { border-color: rgba(139,92,246,0.5); color: #c4b5fd; }
.mr-ctls { display: grid; grid-template-columns: 1fr; gap: 1.1rem; margin-bottom: 1rem; }
.mr-read { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
.mr-stat { background: var(--inset); border: 1px solid var(--border); border-radius: var(--r-md); padding: 0.8rem 1rem; display: flex; flex-direction: column; gap: 0.2rem; }
.mr-stat.accent { background: linear-gradient(160deg, rgba(34,197,94,0.13), rgba(34,211,238,0.06)); border-color: rgba(34,197,94,0.36); }
.mr-s-lbl { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-3); }
.mr-s-val { font-family: var(--mono); font-size: 1.45rem; font-weight: 800; color: var(--text); }
.mr-stat.accent .mr-s-val { color: #86efac; }

/* ===================== BANDWIDTH ===================== */
.bw-grid { display: grid; grid-template-columns: 1fr; gap: 1.2rem; }
.bw-ctls { display: flex; flex-direction: column; gap: 1.1rem; }
.bw-out { display: flex; flex-direction: column; gap: 0.7rem; }
.bw-verdict { font-size: 0.92rem; color: var(--text-2); padding: 0.8rem 1rem; border-radius: var(--r-sm); background: rgba(255,255,255,0.03); border: 1px solid var(--border); min-height: 3.4em; }
.bw-verdict b { color: var(--text); }

/* ===================== LANGUAGE TOKENIZER ===================== */
.lt-row { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.lt-cell { background: var(--inset); border: 1px solid var(--border); border-radius: var(--r-md); padding: 0.9rem 1rem; }
.lt-flag { display: block; font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--cyan); margin-bottom: 0.5rem; }
.lt-input { width: 100%; resize: vertical; min-height: 56px; font-family: inherit; font-size: 0.95rem; color: var(--text); background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-sm); padding: 0.7rem 0.8rem; line-height: 1.55; }
.lt-input:focus { outline: none; border-color: rgba(34,211,238,0.5); }
.lt-out { display: flex; flex-wrap: wrap; gap: 4px; margin: 0.7rem 0 0.5rem; min-height: 1.8em; }
.lt-tok { font-family: var(--mono); font-size: 0.8rem; padding: 0.2rem 0.4rem; border-radius: 5px; border: 1px solid transparent; white-space: pre; }
.lt-stat { font-family: var(--mono); font-size: 0.78rem; color: var(--text-3); }
.lt-stat b { color: var(--cyan); font-size: 1rem; }
.lt-note { font-size: 0.84rem; color: var(--text-3); margin-top: 1rem; }

/* ===================== LIBRARY / FORMAT CARDS ===================== */
.lb-groups { display: grid; grid-template-columns: 1fr; gap: 1.1rem; }
.lb-group-h { font-size: 0.74rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-3); margin-bottom: 0.6rem; display: flex; align-items: center; gap: 0.4rem; }
.lb-group-h i { color: var(--cyan); }
.lb-chips { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.lb-chip { font-family: inherit; font-size: 0.84rem; font-weight: 600; cursor: pointer; color: var(--text-2); background: var(--inset); border: 1px solid var(--border); border-radius: 10px; padding: 0.5rem 0.85rem; min-height: 44px; transition: all 0.15s; display: inline-flex; align-items: center; gap: 0.45rem; }
.lb-chip:hover { color: #fff; border-color: var(--border-2); }
.lb-chip.active { color: #fff; border-color: rgba(34,211,238,0.55); background: rgba(34,211,238,0.10); }
.lb-chip.download { border-style: dashed; border-color: rgba(34,197,94,0.45); }
.lb-chip.download i { color: var(--green); }
.lb-chip .lb-star { color: var(--green); font-size: 0.7rem; }
.lb-detail { margin-top: 1.2rem; font-size: 0.93rem; color: var(--text-2); padding: 1rem 1.1rem; border-radius: var(--r-md); background: var(--inset); border: 1px solid var(--border); border-left: 4px solid var(--cyan); min-height: 5em; }
.lb-detail h4 { font-size: 1.05rem; margin-bottom: 0.35rem; color: var(--text); display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.lb-detail .lb-role { font-size: 0.64rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; padding: 0.18rem 0.5rem; border-radius: 999px; background: rgba(99,102,241,0.18); color: #c7d2fe; }
.lb-detail b { color: var(--text); }
.lb-detail .lb-dl { margin-top: 0.6rem; font-size: 0.84rem; color: #86efac; display: inline-flex; align-items: center; gap: 0.4rem; }

/* ===================== NEXT CTA / RECAP ===================== */
.next-cta { margin-top: 1.6rem; display: flex; gap: 1rem; align-items: center; background: linear-gradient(160deg, rgba(34,211,238,0.12), rgba(139,92,246,0.07)); border: 1px solid rgba(34,211,238,0.32); border-radius: var(--r-md); padding: 1.2rem 1.3rem; }
.next-cta .ic-ico { margin: 0; flex: 0 0 auto; }
.next-cta h4 { font-size: 1.05rem; margin-bottom: 0.2rem; }
.next-cta p { font-size: 0.92rem; color: var(--text-2); }
.next-cta a.more { color: #67e8f9; font-weight: 600; text-decoration: none; white-space: nowrap; }
.next-cta a.more:hover { text-decoration: underline; }

.recap-list { counter-reset: r; list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.7rem; }
.recap-list li { counter-increment: r; position: relative; padding: 0.85rem 1rem 0.85rem 3.2rem; background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-md); font-size: 0.98rem; color: var(--text-2); }
.recap-list li::before { content: counter(r); position: absolute; left: 0.85rem; top: 0.78rem; width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; font-family: var(--mono); font-weight: 700; font-size: 0.85rem; color: #fff; background: var(--grad-acc); }
.recap-cta { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.6rem; }
.btn-primary, .btn-ghost { display: inline-flex; align-items: center; gap: 0.5rem; text-decoration: none; font-size: 0.92rem; font-weight: 600; padding: 0.65rem 1.2rem; border-radius: 999px; min-height: 44px; transition: transform 0.15s, border-color 0.15s, background 0.15s; }
.btn-primary { color: #fff; background: var(--grad-acc); box-shadow: 0 8px 22px -10px var(--indigo); }
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost { color: var(--text-2); border: 1px solid var(--border); }
.btn-ghost:hover { color: #fff; border-color: var(--border-2); }

.doc-foot { margin-top: 2.4rem; padding-top: 1.4rem; border-top: 1px solid var(--border); }
.doc-foot p { font-size: 0.85rem; color: var(--text-3); max-width: 760px; }

/* ===================== RESPONSIVE ===================== */
@media (min-width: 540px) {
    .fit-row { grid-template-columns: repeat(6, 1fr); }
}
@media (min-width: 720px) {
    .two-col { grid-template-columns: 1fr 1fr; }
    .calc-figs { grid-template-columns: repeat(3, 1fr); }
    .calc-controls { grid-template-columns: 1fr 1fr; }
    .qr-grid { grid-template-columns: 1fr 1.05fr; align-items: start; }
    .mr-ctls { grid-template-columns: 1fr 1fr; }
    .bw-grid { grid-template-columns: 1fr 1fr; align-items: start; }
    .lt-row { grid-template-columns: 1fr 1fr; }
    .lb-groups { grid-template-columns: 1fr; }
}
@media (min-width: 980px) {
    .lb-groups { grid-template-columns: repeat(3, 1fr); }
}

/* Reduced motion / mobile perf */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}