/* ── Page-scoped tokens (extending the base style.css palette) ─── */
  .about-page {
    --bg-hover-soft:  rgba(255, 255, 255, 0.04);
    --primary-soft:   rgba(99, 102, 241, 0.10);
    --primary-ring:   rgba(99, 102, 241, 0.20);
    --success-soft:   rgba(16, 185, 129, 0.10);
    --success-ring:   rgba(16, 185, 129, 0.42);
    --warning:        #f59e0b;
    --warning-soft:   rgba(245, 158, 11, 0.10);
    --danger-soft:    rgba(239, 68, 68, 0.10);
    --danger-text:    #f87171;
    --border-strong:  #475569;
    --border-ghost:   rgba(148, 163, 184, 0.25);
    --radius-sm:      0.25rem;
    --radius-lg:      0.75rem;
    --radius-pill:    9999px;
    --shadow-primary: 0 6px 18px rgba(99, 102, 241, 0.35);
    --shadow-image:   0 0 20px rgba(0, 0, 0, 0.5);
    --font-mono:      'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
    --dur:            0.2s;
    --dur-med:        0.3s;
    --ease-default:   cubic-bezier(0.4, 0, 0.2, 1);

    font-size: 15px;
    line-height: 1.55;
    overflow-x: hidden;
  }
  .about-page *, .about-page *::before, .about-page *::after { box-sizing: border-box; }

  /* ── Buttons (page-scoped — base.html .btn is a button-tag style) ─ */
  .about-page .ab-btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    border-radius: var(--radius); padding: 0.55rem 1rem;
    font-family: var(--font-sans); font-size: 0.9rem; font-weight: 500;
    border: 1px solid transparent; cursor: pointer;
    transition: all var(--dur) var(--ease-default);
    text-decoration: none;
  }
  .about-page .ab-btn-primary { background: var(--primary); color: #fff; }
  .about-page .ab-btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: var(--shadow-primary); color: #fff; }
  .about-page .ab-btn-outline { background: transparent; color: var(--text-main); border-color: var(--border); }
  .about-page .ab-btn-outline:hover { border-color: var(--primary); color: var(--text-main); }

  /* ── Layout ──────────────────────────────────────── */
  .about-page .wrap { max-width: 1240px; margin: 0 auto; padding: 0 2rem; }
  .about-page .eyebrow {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-muted);
    display: inline-flex; align-items: center; gap: 0.5rem;
  }
  .about-page .eyebrow::before {
    content: ""; width: 1.5rem; height: 1px; background: var(--border-strong);
  }
  .about-page .step-no {
    font-family: var(--font-mono);
    font-size: 0.7rem; letter-spacing: 0.14em;
    color: var(--primary);
  }

  /* ── Hero ────────────────────────────────────────── */
  .about-page .hero {
    position: relative;
    padding: 5.5rem 0 4rem;
    border-bottom: 1px solid var(--border);
    overflow: hidden;
  }
  .about-page .hero-grid {
    display: grid; grid-template-columns: 1.2fr 1fr; gap: 4rem; align-items: center;
  }
  .about-page .hero h1 {
    font-size: clamp(2.2rem, 4.2vw, 3.4rem);
    line-height: 1.04;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin: 0.75rem 0 1.25rem;
    text-wrap: balance;
    color: var(--text-main);
  }
  .about-page .hero h1 em {
    font-style: normal;
    color: var(--primary);
    font-weight: 700;
  }
  .about-page .hero p.lede {
    font-size: 1.08rem;
    color: var(--text-muted);
    line-height: 1.55;
    max-width: 44ch;
    text-wrap: pretty;
  }
  .about-page .hero-ctas { display: flex; gap: 0.75rem; margin-top: 2rem; align-items: center; }

  /* Hero diagram: miniature pipeline */
  .about-page .pipeline {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
  }
  .about-page .pipeline-header {
    display: flex; justify-content: space-between; align-items: center;
    font-family: var(--font-mono); font-size: 0.7rem;
    color: var(--text-muted); letter-spacing: 0.08em;
    padding-bottom: 0.75rem; border-bottom: 1px dashed var(--border);
    margin-bottom: 1rem;
  }
  .about-page .pipeline-header .dots { display: flex; gap: 0.35rem; }
  .about-page .pipeline-header .dots span {
    width: 7px; height: 7px; border-radius: 50%; background: var(--border-strong);
  }
  .about-page .pipeline-header .dots span:first-child { background: var(--primary); }
  .about-page .pipeline-stages {
    display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0.5rem;
    position: relative;
  }
  .about-page .pipeline-stage {
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.9rem 0.85rem 1rem;
    position: relative;
  }
  .about-page .pipeline-stage .no {
    font-family: var(--font-mono); font-size: 0.65rem;
    color: var(--primary); letter-spacing: 0.12em;
  }
  .about-page .pipeline-stage .t {
    font-size: 0.85rem; font-weight: 600; margin: 0.35rem 0 0.7rem;
  }
  .about-page .pipeline-stage .viz {
    height: 70px; border: 1px solid var(--border); border-radius: 4px;
    background: #000; position: relative; overflow: hidden;
  }

  /* Stage 1 viz: stacked line-boxes */
  .about-page .viz-lines::before, .about-page .viz-lines::after,
  .about-page .viz-lines > i, .about-page .viz-lines > b {
    content: ""; position: absolute; left: 10%; right: 10%; height: 3px;
    background: rgba(99,102,241,0.28); border: 1px solid var(--primary);
    border-radius: 1px;
  }
  .about-page .viz-lines::before { top: 18%; }
  .about-page .viz-lines > i:nth-child(1) { top: 34%; width: auto; right: 18%; }
  .about-page .viz-lines > i:nth-child(2) { top: 50%; width: auto; right: 14%; }
  .about-page .viz-lines > b:nth-child(3) { top: 66%; right: 22%; }
  .about-page .viz-lines::after { top: 82%; right: 30%; }

  /* Stage 2 viz: split spread */
  .about-page .viz-spread {
    display: flex; gap: 0; align-items: stretch;
    padding: 8px;
  }
  .about-page .viz-spread .half {
    flex: 1; border: 1px solid rgba(148,163,184,0.35);
    background: repeating-linear-gradient(0deg, rgba(148,163,184,0.15) 0 1px, transparent 1px 7px);
  }
  .about-page .viz-spread .fold {
    width: 1px; background: var(--primary);
    box-shadow: 0 0 6px var(--primary);
    position: relative;
  }
  .about-page .viz-spread .fold::before, .about-page .viz-spread .fold::after {
    content: ""; position: absolute; left: 50%; width: 5px; height: 5px;
    background: var(--primary); border-radius: 50%; transform: translateX(-50%);
  }
  .about-page .viz-spread .fold::before { top: -3px; }
  .about-page .viz-spread .fold::after { bottom: -3px; }

  /* Stage 3 viz: tiled crops */
  .about-page .viz-crops {
    display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr 1fr;
    gap: 2px; padding: 6px;
  }
  .about-page .viz-crops div {
    background: rgba(99,102,241,0.12); border: 1px solid rgba(99,102,241,0.55);
    border-radius: 2px;
  }
  .about-page .viz-crops div:nth-child(1) { background: rgba(99,102,241,0.18); border-color: var(--primary); }
  .about-page .viz-crops div:nth-child(2) { background: rgba(236,72,153,0.18); border-color: #ec4899; }
  .about-page .viz-crops div:nth-child(3) { background: rgba(245,158,11,0.18); border-color: #f59e0b; }
  .about-page .viz-crops div:nth-child(4) { background: rgba(16,185,129,0.18); border-color: #10b981; }
  .about-page .viz-crops div:nth-child(5) { background: rgba(139,92,246,0.18); border-color: #8b5cf6; }
  .about-page .viz-crops div:nth-child(6) { background: rgba(99,102,241,0.18); border-color: var(--primary); }

  /* ── Section shell ───────────────────────────────── */
  .about-page section.step { padding: 6rem 0; border-bottom: 1px solid var(--border); }
  .about-page .step-grid {
    display: grid; grid-template-columns: 1fr 1.25fr; gap: 4rem; align-items: start;
  }
  .about-page .step-grid.reverse { grid-template-columns: 1.25fr 1fr; }
  .about-page .step-copy .step-title {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.08;
    margin: 0.5rem 0 1.25rem;
    text-wrap: balance;
    color: var(--text-main);
  }
  .about-page .step-copy .step-title em {
    font-style: normal;
    color: var(--primary);
  }
  .about-page .step-copy p {
    color: var(--text-muted);
    font-size: 0.98rem; line-height: 1.6;
    max-width: 42ch;
  }
  .about-page .caption-list {
    margin-top: 1.5rem; padding: 0; list-style: none;
    border-top: 1px dashed var(--border);
  }
  .about-page .caption-list li {
    display: grid; grid-template-columns: 6rem 1fr; gap: 1rem;
    padding: 0.85rem 0; border-bottom: 1px dashed var(--border);
    align-items: baseline;
  }
  .about-page .caption-list li .k {
    font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em;
    color: var(--text-muted); text-transform: uppercase;
  }
  .about-page .caption-list li .v {
    font-size: 0.92rem; color: var(--text-main);
  }
  .about-page .caption-list li .v b { color: var(--primary); font-weight: 600; }

  /* Image frame */
  .about-page .frame {
    position: relative;
    background: #000;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-image);
  }
  .about-page .frame img { display: block; width: 100%; height: auto; }
  .about-page .frame .corner-labels {
    position: absolute; inset: 0; pointer-events: none;
  }
  .about-page .frame .corner-labels span {
    position: absolute; font-family: var(--font-mono);
    font-size: 0.65rem; letter-spacing: 0.1em;
    color: var(--text-muted); padding: 0.35rem 0.55rem;
    background: rgba(15,23,42,0.88); backdrop-filter: blur(6px);
    border: 1px solid var(--border-ghost); border-radius: var(--radius-sm);
  }
  .about-page .frame .corner-labels .tl { top: 0.75rem; left: 0.75rem; }
  .about-page .frame .corner-labels .tr { top: 0.75rem; right: 0.75rem; }
  .about-page .frame .corner-labels .bl { bottom: 0.75rem; left: 0.75rem; }
  .about-page .frame .corner-labels .br { bottom: 0.75rem; right: 0.75rem; color: var(--primary); border-color: var(--primary-ring); }

  /* data-note: annotated callouts beside figures */
  .about-page .data-note {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
    display: flex; gap: 0.75rem; align-items: center;
    margin-top: 0.85rem;
    flex-wrap: wrap;
  }
  .about-page .data-note .chip {
    padding: 0.2rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-main);
  }
  .about-page .data-note .chip.primary { color: var(--primary); border-color: var(--primary-ring); background: var(--primary-soft); }
  .about-page .data-note .chip.success { color: var(--success); border-color: var(--success-ring); background: var(--success-soft); }
  .about-page .data-note .chip.warning { color: var(--warning); border-color: rgba(245,158,11,0.42); background: var(--warning-soft); }
  .about-page .data-note .chip.danger { color: var(--danger-text); border-color: rgba(239,68,68,0.42); background: var(--danger-soft); }

  /* ── Step 2 interactive ──────────────────────────── */
  .about-page #step-2 .frame.is-single { max-width: 320px; }
  .about-page .split-toggle {
    display: inline-flex; background: var(--bg-card);
    border: 1px solid var(--border); border-radius: var(--radius-pill);
    padding: 3px; margin-bottom: 1rem;
  }
  .about-page .split-toggle button {
    background: transparent; color: var(--text-muted); border: 0; cursor: pointer;
    font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em;
    padding: 0.45rem 0.9rem; border-radius: var(--radius-pill);
    text-transform: uppercase; transition: all var(--dur) var(--ease-default);
  }
  .about-page .split-toggle button.active {
    background: var(--primary); color: #fff;
  }

  .about-page .profile-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 1.25rem 1.25rem 1rem;
    margin-top: 1.25rem;
  }
  .about-page .profile-head {
    display: flex; justify-content: space-between; align-items: baseline;
    font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em;
    color: var(--text-muted); margin-bottom: 0.85rem;
  }
  .about-page .profile-head .title { color: var(--text-main); font-weight: 600; }
  .about-page .profile-head .verdict {
    padding: 0.22rem 0.55rem; border-radius: var(--radius-pill);
    font-size: 0.66rem;
  }
  .about-page .profile-head .verdict.split { background: var(--success-soft); color: var(--success); border: 1px solid var(--success-ring); }
  .about-page .profile-head .verdict.no { background: var(--warning-soft); color: var(--warning); border: 1px solid rgba(245,158,11,0.42); }

  .about-page .profile-chart-wrap { position: relative; }
  .about-page .profile-chart {
    display: block; width: 100%; height: 110px;
  }
  .about-page .check-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.4rem;
    margin-top: 0.85rem;
  }
  .about-page .check {
    display: flex; justify-content: space-between; align-items: center;
    padding: 0.4rem 0.55rem;
    background: var(--bg-body); border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono); font-size: 0.68rem;
    letter-spacing: 0.04em;
  }
  .about-page .check .label { color: var(--text-muted); }
  .about-page .check .mark { font-weight: 600; }
  .about-page .check.pass .mark { color: var(--success); }
  .about-page .check.fail .mark { color: var(--danger-text); }
  .about-page .check.pass { border-color: rgba(16,185,129,0.28); }
  .about-page .check.fail { border-color: rgba(239,68,68,0.28); }

  /* ── Step 3 — figure size constraint ──────────────── */
  .about-page #step-3 .step-grid > div:last-child { max-width: 460px; justify-self: center; width: 100%; }

  /* ── Step 3 — tile stepper ────────────────────────── */
  .about-page .tile-stepper {
    display: inline-flex; background: var(--bg-card);
    border: 1px solid var(--border); border-radius: var(--radius-pill);
    padding: 3px; margin-top: 1rem;
  }
  .about-page .tile-stepper button {
    background: transparent; color: var(--text-muted); border: 0; cursor: pointer;
    font-family: var(--font-mono); font-size: 0.72rem;
    padding: 0.4rem 0.85rem; border-radius: var(--radius-pill);
    letter-spacing: 0.05em; transition: all var(--dur) var(--ease-default);
  }
  .about-page .tile-stepper button.active { background: var(--primary); color: #fff; }
  .about-page .tile-stepper .sep { color: var(--border-strong); padding: 0 0.25rem; align-self: center; }

  .about-page .tile-overlay {
    position: absolute; inset: 0; pointer-events: none;
    display: flex; flex-direction: column;
  }
  .about-page .tile-overlay .row {
    flex: 1; position: relative;
    border-top: 2px dashed transparent;
    transition: all var(--dur-med) var(--ease-default);
  }
  .about-page .tile-overlay .row + .row {
    border-top: 3px dashed rgba(99,102,241,0.95);
    box-shadow: 0 -1px 0 rgba(0,0,0,0.6), 0 1px 0 rgba(0,0,0,0.6);
  }
  .about-page .tile-overlay .row .lbl {
    position: absolute; top: 0.5rem; left: 0.5rem;
    font-family: var(--font-mono); font-size: 0.65rem; letter-spacing: 0.08em;
    padding: 0.2rem 0.45rem; border-radius: var(--radius-sm);
    text-transform: uppercase; font-weight: 600;
    background: rgba(15,23,42,0.88); backdrop-filter: blur(6px);
    border: 1px solid var(--border-ghost);
  }
  .about-page .tile-overlay .row:nth-child(1) .lbl { color: var(--primary); border-color: var(--primary-ring); }
  .about-page .tile-overlay .row:nth-child(2) .lbl { color: #f59e0b; border-color: rgba(245,158,11,0.42); }
  .about-page .tile-overlay .row:nth-child(3) .lbl { color: #10b981; border-color: var(--success-ring); }

  /* ── Before / After ──────────────────────────────── */
  .about-page .ba-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 2rem;
  }
  .about-page .ba-col .label {
    font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em;
    text-transform: uppercase; color: var(--text-muted);
    margin-bottom: 0.75rem; display: flex; align-items: center; gap: 0.5rem;
  }
  .about-page .ba-col .label .dot-p { width: 6px; height: 6px; border-radius: 50%; background: var(--primary); }
  .about-page .ba-col .label .dot-s { width: 6px; height: 6px; border-radius: 50%; background: var(--success); }
  .about-page .transcription {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem 1.5rem 1.25rem;
    height: 100%;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-main);
    position: relative;
  }
  .about-page .transcription .meta {
    font-family: var(--font-sans);
    display: flex; justify-content: space-between;
    font-size: 0.7rem; color: var(--text-muted);
    letter-spacing: 0.1em; text-transform: uppercase;
    margin-bottom: 1rem; padding-bottom: 0.75rem;
    border-bottom: 1px dashed var(--border);
  }
  .about-page .transcription .meta .ok { color: var(--success); }
  .about-page .transcription p { margin: 0 0 0.75rem; color: var(--text-main); font-size: inherit; line-height: inherit; font-family: inherit; }
  .about-page .transcription .typing::after {
    content: "▍"; color: var(--primary); animation: about-blink 1s steps(2) infinite;
    margin-left: 2px;
  }
  @keyframes about-blink { 50% { opacity: 0; } }

  /* ── Feature sections (batch / editor / export) ──── */
  .about-page section.feature { padding: 6rem 0; border-bottom: 1px solid var(--border); }
  .about-page .feature-head { text-align: center; max-width: 56ch; margin: 0 auto 3rem; }
  .about-page .feature-head .eyebrow { justify-content: center; }
  .about-page .feature-head h2 {
    font-size: 2rem; font-weight: 700; letter-spacing: -0.02em;
    margin: 0.6rem 0 0.75rem; line-height: 1.1;
    color: var(--text-main);
  }
  .about-page .feature-head h2 em { font-style: normal; color: var(--primary); }
  .about-page .feature-head p { color: var(--text-muted); margin: 0; }

  /* Mock window chrome (mimics product UI) */
  .about-page .mock {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); overflow: hidden;
    box-shadow: var(--shadow);
  }
  .about-page .mock-bar {
    display: flex; align-items: center; gap: 0.6rem;
    padding: 0.65rem 1rem; border-bottom: 1px solid var(--border);
    background: rgba(15,23,42,0.6);
  }
  .about-page .mock-bar .dots { display: flex; gap: 0.35rem; }
  .about-page .mock-bar .dots span { width: 9px; height: 9px; border-radius: 50%; background: var(--border-strong); }
  .about-page .mock-bar .url {
    font-family: var(--font-mono); font-size: 0.7rem;
    color: var(--text-muted); margin-left: 0.5rem;
    letter-spacing: 0.04em;
  }
  .about-page .mock-bar .right {
    margin-left: auto; font-family: var(--font-mono);
    font-size: 0.65rem; color: var(--text-muted); letter-spacing: 0.1em;
  }

  /* Project header inside mock */
  .about-page .proj-head {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1.25rem 1.5rem; border-bottom: 1px solid var(--border);
  }
  .about-page .proj-head .title { font-weight: 600; font-size: 1.05rem; display: flex; gap: 0.5rem; align-items: center; }
  .about-page .proj-head .title svg { color: var(--text-muted); }
  .about-page .proj-head .actions { display: flex; gap: 0.5rem; }
  .about-page .pill-btn {
    background: var(--bg-body); border: 1px solid var(--border);
    color: var(--text-main); padding: 0.45rem 0.85rem;
    border-radius: var(--radius); font-size: 0.78rem;
    font-weight: 500; display: inline-flex; gap: 0.4rem; align-items: center;
    cursor: default;
  }
  .about-page .pill-btn.primary {
    background: var(--primary-soft); border-color: var(--primary-ring); color: var(--primary);
  }
  .about-page .pill-btn .save { font-size: 0.65rem; color: var(--text-muted); font-weight: 400; }
  .about-page .pill-btn.primary .save { color: var(--primary); opacity: 0.85; }

  /* Stat strip */
  .about-page .stat-strip {
    display: flex; gap: 2.5rem;
    padding: 1.25rem 1.5rem; border-bottom: 1px solid var(--border);
  }
  .about-page .stat-strip .stat .v { font-size: 1.4rem; font-weight: 600; line-height: 1.1; }
  .about-page .stat-strip .stat .v .total { color: var(--text-muted); font-weight: 400; }
  .about-page .stat-strip .stat .l {
    font-family: var(--font-sans); font-size: 0.65rem; letter-spacing: 0.14em;
    color: var(--text-muted); text-transform: uppercase; margin-top: 0.25rem;
  }

  /* Search bar */
  .about-page .search-bar {
    margin: 1.25rem 1.5rem 0;
    background: var(--bg-body); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 0.65rem 0.85rem;
    display: flex; align-items: center; gap: 0.65rem;
    color: var(--text-muted); font-size: 0.85rem;
  }
  .about-page .search-bar svg { flex: none; }
  .about-page .search-bar .kbd {
    margin-left: auto; font-family: var(--font-mono); font-size: 0.7rem;
    padding: 0.15rem 0.45rem; border: 1px solid var(--border); border-radius: 4px;
  }

  /* Batch progress sweep */
  .about-page .batch-progress {
    margin: 1.25rem 1.5rem 0;
    height: 6px; background: var(--bg-body);
    border-radius: 999px; overflow: hidden; border: 1px solid var(--border);
    position: relative;
  }
  .about-page .batch-progress .meta {
    position: absolute; right: 0; top: -1.5rem;
    font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-muted);
  }

  /* Page grid */
  .about-page .page-grid {
    display: grid; grid-template-columns: repeat(6, 1fr); gap: 0.75rem;
    padding: 1.25rem 1.5rem 1.5rem;
  }
  .about-page .page-card {
    background: var(--bg-body); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 0.75rem 0.85rem 0.65rem;
    transition: all var(--dur) var(--ease-default);
  }
  .about-page .page-card:hover { border-color: var(--primary-ring); transform: translateY(-1px); }
  .about-page .page-card .id {
    font-family: var(--font-mono); font-size: 0.72rem;
    color: var(--text-main); white-space: nowrap; overflow: hidden;
    text-overflow: ellipsis; margin-bottom: 0.4rem;
  }
  .about-page .page-card .pill {
    display: inline-block; font-family: var(--font-mono); font-size: 0.6rem;
    letter-spacing: 0.08em; padding: 0.18rem 0.45rem;
    border-radius: 999px; font-weight: 600;
  }
  .about-page .pill.done { background: var(--success-soft); color: var(--success); border: 1px solid var(--success-ring); }
  .about-page .pill.proc { background: var(--warning-soft); color: var(--warning); border: 1px solid rgba(245,158,11,0.42); }
  .about-page .pill.queue { background: var(--bg-card); color: var(--text-muted); border: 1px solid var(--border); }

  .about-page .page-card.processing .pill::before {
    content: ""; display: inline-block; width: 6px; height: 6px;
    margin-right: 4px; border-radius: 50%; background: var(--warning);
    animation: about-pulse-dot 1.2s infinite;
  }
  @keyframes about-pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
  }

  /* ── Editor split (image | text) ──────────────────── */
  .about-page .editor-split {
    display: grid; grid-template-columns: 1fr 1fr; min-height: 520px;
  }
  .about-page .editor-text {
    background: var(--bg-card);
    padding: 1.5rem 1.5rem 1rem;
    display: flex; flex-direction: column;
    border-right: 1px solid var(--border);
  }
  .about-page .editor-text .num {
    font-family: var(--font-mono); font-size: 0.75rem;
    color: var(--text-muted); margin-bottom: 0.85rem; letter-spacing: 0.08em;
  }
  .about-page .editor-textarea {
    flex: 1; font-family: var(--font-mono); font-size: 0.82rem;
    line-height: 1.7; color: var(--text-main);
    background: transparent; border: 0; resize: none;
    width: 100%; padding: 0; margin: 0; outline: none;
  }
  .about-page .editor-text .highlight {
    background: rgba(99,102,241,0.18);
    border-bottom: 2px solid var(--primary);
    padding: 0 1px;
  }
  .about-page .editor-controls {
    display: flex; gap: 0.5rem; margin-top: 1rem;
    padding-top: 1rem; border-top: 1px dashed var(--border);
  }
  .about-page .editor-image {
    background: #000; position: relative;
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
  }
  .about-page .editor-image img {
    width: 100%; height: 100%; object-fit: cover; display: block;
  }
  .about-page .editor-image .zoom-controls {
    position: absolute; bottom: 0.85rem; left: 50%; transform: translateX(-50%);
    background: rgba(15,23,42,0.88); backdrop-filter: blur(6px);
    border: 1px solid var(--border-ghost);
    border-radius: var(--radius-pill);
    padding: 0.3rem 0.5rem; display: flex; align-items: center; gap: 0.5rem;
  }
  .about-page .editor-image .zoom-controls button {
    background: transparent; border: 0; color: var(--text-main);
    cursor: pointer; padding: 0.2rem; display: flex;
  }
  .about-page .editor-image .zoom-controls .track {
    width: 80px; height: 3px; background: var(--border-strong);
    border-radius: 2px; position: relative;
  }
  .about-page .editor-image .zoom-controls .track::after {
    content: ""; position: absolute; left: 35%; top: -3px;
    width: 9px; height: 9px; background: var(--primary); border-radius: 50%;
  }

  /* ── Export modal ─────────────────────────────────── */
  .about-page .export-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center;
  }
  .about-page .export-modal {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); overflow: hidden;
    box-shadow: var(--shadow);
    max-width: 460px; margin: 0 auto;
  }
  .about-page .export-modal .head {
    padding: 1.1rem 1.25rem; display: flex; justify-content: space-between;
    align-items: center; border-bottom: 1px solid var(--border);
  }
  .about-page .export-modal .head h3 { margin: 0; font-size: 1.05rem; font-weight: 600; }
  .about-page .export-modal .head .x { color: var(--text-muted); cursor: pointer; }
  .about-page .export-modal .body { padding: 1.25rem; display: flex; flex-direction: column; gap: 1rem; }
  .about-page .field-label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 0.45rem; display: block; }
  .about-page .format-tabs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.4rem; }
  .about-page .format-tab {
    padding: 0.7rem 0.5rem; background: var(--bg-body);
    border: 1px solid var(--border); border-radius: var(--radius);
    text-align: center; cursor: pointer;
    transition: all var(--dur) var(--ease-default);
  }
  .about-page .format-tab:hover { border-color: var(--border-strong); }
  .about-page .format-tab.active {
    border-color: var(--primary); background: var(--primary-soft);
  }
  .about-page .format-tab .ext {
    font-family: var(--font-mono); font-size: 0.72rem;
    color: var(--primary); font-weight: 600; letter-spacing: 0.06em;
  }
  .about-page .format-tab.active .ext { color: var(--primary); }
  .about-page .format-tab:not(.active) .ext { color: var(--text-muted); }
  .about-page .format-tab .name { font-size: 0.78rem; margin-top: 0.2rem; }
  .about-page .radio-row {
    display: flex; align-items: center; gap: 0.65rem;
    padding: 0.7rem 0.85rem;
    border: 1px solid var(--border); border-radius: var(--radius);
    background: var(--bg-body); font-size: 0.85rem;
  }
  .about-page .radio-row.active { border-color: var(--primary); }
  .about-page .radio-row .dot {
    width: 14px; height: 14px; border-radius: 50%;
    border: 1.5px solid var(--border-strong);
    flex: none; position: relative;
  }
  .about-page .radio-row.active .dot { border-color: var(--primary); }
  .about-page .radio-row.active .dot::after {
    content: ""; position: absolute; inset: 3px;
    background: var(--primary); border-radius: 50%;
  }
  .about-page .checkbox-row {
    display: flex; align-items: center; gap: 0.65rem;
    padding: 0.6rem 0.85rem;
    border: 1px solid var(--border); border-radius: var(--radius);
    background: var(--bg-body); font-size: 0.85rem;
    color: var(--text-muted);
  }
  .about-page .checkbox-row .box {
    width: 14px; height: 14px; border-radius: 3px;
    border: 1.5px solid var(--border-strong); flex: none;
  }
  .about-page .export-modal .foot {
    padding: 1rem 1.25rem; border-top: 1px solid var(--border);
    display: flex; justify-content: space-between; align-items: center;
    background: rgba(15,23,42,0.4);
  }
  .about-page .export-modal .foot .hint { font-size: 0.72rem; color: var(--text-muted); max-width: 18ch; }
  .about-page .export-modal .foot .row { display: flex; gap: 0.5rem; }

  .about-page .export-list {
    display: flex; flex-direction: column; gap: 0.85rem;
  }
  .about-page .export-list .item {
    display: flex; gap: 1rem; align-items: flex-start;
    padding: 1rem 1.1rem;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius);
  }
  .about-page .export-list .ext-badge {
    font-family: var(--font-mono); font-size: 0.7rem; font-weight: 600;
    padding: 0.45rem 0.55rem; border-radius: var(--radius-sm);
    background: var(--primary-soft); color: var(--primary);
    border: 1px solid var(--primary-ring); letter-spacing: 0.05em;
    flex: none; min-width: 3.4rem; text-align: center;
  }
  .about-page .export-list .info .t { font-weight: 600; font-size: 0.92rem; }
  .about-page .export-list .info .d { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.15rem; }

  /* ── Footer CTA ──────────────────────────────────── */
  .about-page section.footer-cta {
    padding: 6rem 0 3rem;
    text-align: center;
  }
  .about-page .footer-cta h2 {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 700; letter-spacing: -0.02em;
    margin: 0.5rem 0 1rem;
    color: var(--text-main);
  }
  .about-page .footer-cta p { color: var(--text-muted); max-width: 46ch; margin: 0 auto 2rem; }
  .about-page .footer-cta .row { display: inline-flex; gap: 0.75rem; }

  /* ── Step index strip ────────────────────────────── */
  .about-page .index-strip {
    display: flex; gap: 2rem; padding: 1.25rem 0;
    border-bottom: 1px solid var(--border);
    font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.12em;
    color: var(--text-muted); text-transform: uppercase;
    flex-wrap: wrap;
  }
  .about-page .index-strip a {
    text-decoration: none; color: var(--text-muted);
    display: flex; align-items: center; gap: 0.55rem;
    transition: color var(--dur) var(--ease-default);
  }
  .about-page .index-strip a:hover { color: var(--text-main); }
  .about-page .index-strip a .no { color: var(--primary); }

  /* ── Subtle grid background in hero ──────────────── */
  .about-page .hero-bg {
    position: absolute; inset: 0; pointer-events: none; z-index: 0;
    background-image:
      linear-gradient(rgba(99,102,241,0.06) 1px, transparent 1px),
      linear-gradient(90deg, rgba(99,102,241,0.06) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at 70% 40%, #000 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at 70% 40%, #000 20%, transparent 70%);
  }
  .about-page .hero > .wrap { position: relative; z-index: 1; }

  /* ── Image quality section ───────────────────────── */
  .about-page .quality-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; align-items: stretch;
  }
  .about-page .quality-col {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 1.5rem 1.5rem 1.25rem;
  }
  .about-page .quality-head {
    display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.5rem 0.65rem;
    font-size: 0.95rem; font-weight: 600; color: var(--text-main);
    padding-bottom: 0.85rem; margin-bottom: 0.85rem;
    border-bottom: 1px dashed var(--border);
  }
  .about-page .quality-head .dot {
    width: 0.55rem; height: 0.55rem; border-radius: 50%;
    background: var(--text-muted); flex: none; align-self: center;
  }
  .about-page .quality-col.works .quality-head .dot { background: #22c55e; }
  .about-page .quality-col.less .quality-head .dot { background: var(--warning); }
  .about-page .quality-head .quality-sub {
    font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.08em;
    text-transform: uppercase; color: var(--text-muted); font-weight: 500;
  }
  .about-page .quality-list {
    list-style: none; padding: 0; margin: 0;
    display: flex; flex-direction: column; gap: 0.55rem;
    color: var(--text-main); font-size: 0.92rem; line-height: 1.4;
  }
  .about-page .quality-list li {
    position: relative; padding-left: 1.1rem;
  }
  .about-page .quality-list li::before {
    content: "·"; position: absolute; left: 0.3rem; top: -0.15rem;
    color: var(--text-muted); font-weight: 700; font-size: 1.1rem;
  }

  /* ── Responsive ──────────────────────────────────── */
  @media (max-width: 960px) {
    .about-page .hero-grid,
    .about-page .step-grid,
    .about-page .step-grid.reverse,
    .about-page .ba-grid { grid-template-columns: 1fr; gap: 2.5rem; }
    .about-page .check-grid { grid-template-columns: repeat(2, 1fr); }
    .about-page .index-strip { display: none; }
    .about-page .editor-split { grid-template-columns: 1fr; }
    .about-page .editor-image { min-height: 280px; }
    .about-page .page-grid { grid-template-columns: repeat(2, 1fr); }
    .about-page .stat-strip { gap: 1.5rem; flex-wrap: wrap; }
    .about-page .export-grid { grid-template-columns: 1fr; gap: 2rem; }
    .about-page .quality-grid { grid-template-columns: 1fr; gap: 1rem; }
  }