/* ==========================================================
     Chroma Studio v2 — light theme, library-style layout
     Vanilla HTML/CSS/JS. Single file. Mobile-first.
     Inspired by htmlcolorcodes.com/colors — encyclopedic library
     of named colors combined with a live palette generator.
     ========================================================== */

  *, *::before, *::after { box-sizing: border-box; }

  :root {
    --bg:          #F7F8FA;
    --panel:       #FFFFFF;
    --panel-2:     #F1F3F6;
    --line:        #E4E7EC;
    --line-2:      #CBD2D9;
    --text:        #1A202C;
    --text-dim:    #52606D;
    --text-mute:   #8492A6;
    --accent:      #2B6CB0;
    --accent-2:    #1E4E8C;
    --good:        #2F855A;
    --warn:        #B7791F;
    --bad:         #C53030;
    --radius:      10px;
    --radius-sm:   6px;
    --shadow-sm:   0 1px 2px rgba(15, 23, 42, .05);
    --shadow-md:   0 1px 3px rgba(15,23,42,.06), 0 8px 24px rgba(15,23,42,.05);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

    /* Live-theme slots (updated by JS for the preview panel) */
    --c-primary:   #2B6CB0;
    --c-secondary: #ED8936;
    --c-accent:    #9F7AEA;
    --c-surface:   #F7FAFC;
    --c-ink:       #1A365D;
  }

  html, body { height: 100%; }
  body {
    margin: 0;
    font-family: var(--font-sans);
    color: var(--text);
    background: var(--bg);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  .app { max-width: 1240px; margin: 0 auto; padding: clamp(16px, 3vw, 32px); }

  /* ---------- Header ---------- */
  header.hero {
    display: flex; align-items: center; justify-content: space-between;
    gap: 16px; flex-wrap: wrap;
    padding: 8px 0 24px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 28px;
  }
  .brand { display: flex; align-items: center; gap: 14px; }
  .brand-mark {
    width: 40px; height: 40px; border-radius: 10px;
    background: conic-gradient(from 210deg,
      #ff7a59, #ffd166, #06d6a0, #118ab2, #7c9cff, #b98cff, #ff7a59);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.4), 0 4px 12px rgba(15,23,42,.15);
  }
  .brand h1 { margin: 0; font-size: 20px; font-weight: 700; letter-spacing: -0.02em; }
  .brand p  { margin: 2px 0 0; color: var(--text-dim); font-size: 13px; }
  .hero-actions { display: flex; gap: 8px; flex-wrap: wrap; }

  /* ---------- Buttons ---------- */
  .btn {
    appearance: none;
    border: 1px solid var(--line-2);
    background: var(--panel);
    color: var(--text);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font: inherit; font-size: 13px;
    cursor: pointer;
    transition: background .15s, border-color .15s, transform .05s;
    display: inline-flex; align-items: center; gap: 6px;
    box-shadow: var(--shadow-sm);
  }
  .btn:hover  { background: var(--panel-2); }
  .btn:active { transform: translateY(1px); }
  .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
  .btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
  .btn.primary:hover { background: var(--accent-2); border-color: var(--accent-2); }

  /* ---------- Sections ---------- */
  section.card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px 22px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
  }
  section.card > h2 {
    margin: 0 0 4px;
    font-size: 12px; font-weight: 700;
    letter-spacing: 0.08em; text-transform: uppercase;
    color: var(--text-dim);
  }
  section.card > .card-sub { margin: 0 0 18px; font-size: 14px; color: var(--text-dim); }

  /* ---------- Workspace ---------- */
  .workspace {
    display: grid;
    grid-template-columns: minmax(280px, 340px) 1fr;
    gap: 20px;
  }
  @media (max-width: 860px) { .workspace { grid-template-columns: 1fr; } }

  /* ---------- Picker ---------- */
  .picker-preview {
    height: 96px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--line);
    background: var(--c-primary);
    margin-bottom: 14px;
    position: relative;
    box-shadow: inset 0 1px 0 rgba(255,255,255,.2), inset 0 -1px 0 rgba(0,0,0,.05);
  }
  .picker-preview::after {
    content: attr(data-hex);
    position: absolute; left: 10px; bottom: 8px;
    font-family: var(--font-mono); font-size: 11px;
    padding: 3px 8px;
    background: rgba(255,255,255,.9); color: #111;
    border-radius: 3px; letter-spacing: .04em; font-weight: 600;
  }
  .field { display: block; margin-bottom: 12px; }
  .field label {
    display: block; font-size: 11px; font-weight: 600;
    color: var(--text-mute); margin-bottom: 6px;
    letter-spacing: .06em; text-transform: uppercase;
  }
  .field .row { display: flex; gap: 8px; align-items: center; }
  input[type="text"], input[type="number"], input[type="search"] {
    width: 100%;
    background: var(--panel);
    border: 1px solid var(--line-2);
    color: var(--text);
    padding: 8px 10px;
    font-family: var(--font-mono); font-size: 13px;
    border-radius: var(--radius-sm);
  }
  input[type="text"]:focus, input[type="number"]:focus, input[type="search"]:focus {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
    border-color: transparent;
  }
  input[type="color"] {
    width: 40px; height: 36px;
    border: 1px solid var(--line-2);
    background: var(--panel);
    border-radius: var(--radius-sm);
    padding: 2px; cursor: pointer;
  }
  input[type="range"] { width: 100%; accent-color: var(--accent); }
  .hsl-grid {
    display: grid; grid-template-columns: 18px 1fr 46px;
    gap: 10px; align-items: center;
    margin: 4px 0; font-size: 12px; color: var(--text-dim);
  }
  .hsl-grid span:first-child { font-family: var(--font-mono); font-weight: 600; }
  .hsl-grid output {
    font-family: var(--font-mono); font-size: 12px;
    text-align: right; color: var(--text);
  }

  /* ---------- Harmony ---------- */
  .harmony {
    display: grid; gap: 6px;
    grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  }
  .harmony button {
    padding: 7px 6px; font-size: 12px;
    background: var(--panel);
    border: 1px solid var(--line);
    color: var(--text-dim);
    border-radius: var(--radius-sm);
    cursor: pointer; text-align: center;
    transition: all .12s ease;
  }
  .harmony button:hover { color: var(--text); border-color: var(--line-2); }
  .harmony button.active {
    background: var(--accent); border-color: var(--accent); color: #fff;
  }

  /* ---------- Generated palette ---------- */
  .palette {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
  }
  .swatch {
    border-radius: var(--radius-sm);
    border: 1px solid var(--line);
    background: var(--panel);
    overflow: hidden; cursor: pointer;
    display: flex; flex-direction: column;
    transition: transform .12s, border-color .12s, box-shadow .12s;
  }
  .swatch:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
  .swatch:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
  .swatch-color { min-height: 96px; position: relative; }
  .swatch-color .role {
    position: absolute; top: 8px; left: 10px;
    font-size: 10px; letter-spacing: .08em; text-transform: uppercase;
    padding: 3px 7px; background: rgba(255,255,255,.85); color: #111;
    border-radius: 3px; font-weight: 600;
  }
  .swatch-meta {
    padding: 8px 10px 10px;
    border-top: 1px solid var(--line);
    font-family: var(--font-mono); font-size: 11px;
    color: var(--text-dim);
    display: grid; gap: 2px;
  }
  .swatch-meta .hex { color: var(--text); font-size: 13px; font-weight: 700; letter-spacing: .02em; }

  /* ---------- Preview ---------- */
  .preview-frame {
    background: var(--c-surface);
    color: var(--c-ink);
    border-radius: var(--radius-sm);
    padding: 28px;
    border: 1px solid var(--line);
    display: grid; gap: 24px;
  }
  @media (min-width: 720px) { .preview-frame { grid-template-columns: 1fr 1fr; } }
  .preview-frame h3 {
    margin: 0 0 6px; font-size: 26px;
    letter-spacing: -0.02em; color: var(--c-primary);
    font-weight: 700;
  }
  .preview-frame h4 {
    margin: 0 0 6px; font-size: 14px; font-weight: 700;
    color: var(--c-ink);
    text-transform: uppercase; letter-spacing: .06em;
  }
  .preview-frame p { margin: 0 0 12px; color: var(--c-ink); opacity: .82; font-size: 14px; }
  .preview-typography .lead { font-size: 15px; opacity: .92; margin-bottom: 16px; }
  .type-scale {
    display: grid; gap: 6px;
    padding: 14px 16px;
    border-radius: 8px;
    background: rgba(0,0,0,.04);
    border: 1px solid rgba(0,0,0,.06);
  }
  .type-scale div { display: flex; align-items: baseline; gap: 12px; }
  .type-scale .lbl {
    font-family: var(--font-mono); font-size: 10px;
    color: var(--c-ink); opacity: .55; min-width: 40px;
  }
  .type-scale .t1 { font-size: 22px; font-weight: 700; letter-spacing: -.01em; }
  .type-scale .t2 { font-size: 17px; font-weight: 600; }
  .type-scale .t3 { font-size: 14px; opacity: .85; }
  .type-scale .t4 { font-size: 12px; opacity: .7; }

  .preview-controls { display: grid; gap: 14px; }
  .btn-row { display: flex; gap: 8px; flex-wrap: wrap; }
  .p-btn {
    appearance: none;
    padding: 10px 16px;
    border-radius: 8px;
    font: inherit; font-size: 13px; font-weight: 600;
    cursor: pointer; border: 1px solid transparent;
    transition: filter .15s;
  }
  .p-btn:hover { filter: brightness(1.08); }
  .p-btn.primary   { background: var(--c-primary);   color: var(--c-surface); }
  .p-btn.secondary { background: var(--c-secondary); color: var(--c-surface); }
  .p-btn.accent    { background: var(--c-accent);    color: var(--c-surface); }
  .p-btn.outline   { background: transparent; color: var(--c-primary); border-color: var(--c-primary); }
  .p-form label {
    display: block; font-size: 12px; font-weight: 600;
    color: var(--c-ink); margin: 0 0 4px;
  }
  .p-form input, .p-form select {
    width: 100%; padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid rgba(0,0,0,.15);
    background: rgba(255,255,255,.65);
    color: var(--c-ink);
    font: inherit; font-size: 14px;
  }
  .p-form input:focus, .p-form select:focus {
    outline: 2px solid var(--c-primary);
    outline-offset: 1px; border-color: transparent;
  }
  .p-form .field-row { margin-bottom: 10px; }
  .p-card {
    padding: 16px; border-radius: 10px;
    background: rgba(0,0,0,.04);
    border-left: 4px solid var(--c-accent);
  }
  .p-badge {
    display: inline-block;
    padding: 3px 10px;
    background: var(--c-primary); color: var(--c-surface);
    border-radius: 999px;
    font-size: 11px; font-weight: 600;
    letter-spacing: .04em; text-transform: uppercase;
  }
  .p-link { color: var(--c-primary); text-decoration: underline; text-underline-offset: 3px; font-weight: 500; }

  /* ---------- Contrast ---------- */
  .contrast-grid {
    display: grid; gap: 10px;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  }
  .contrast-cell {
    padding: 16px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(0,0,0,.08);
    font-size: 13px;
    display: grid; gap: 8px;
  }
  .contrast-cell .sample { font-size: 16px; font-weight: 600; letter-spacing: -0.01em; }
  .contrast-cell .ratio { font-family: var(--font-mono); font-size: 12px; opacity: .85; }
  .contrast-cell .badges { display: flex; gap: 4px; flex-wrap: wrap; }
  .badge {
    font-family: var(--font-mono); font-size: 10px;
    padding: 2px 6px; border-radius: 3px;
    font-weight: 700; letter-spacing: .04em;
  }
  .badge.pass { background: rgba(47,133,90,.15); color: #276749; }
  .badge.fail { background: rgba(197,48,48,.12); color: #9B2C2C; }

  /* ---------- Tokens ---------- */
  .tabs {
    display: flex; gap: 4px; flex-wrap: wrap;
    border-bottom: 1px solid var(--line);
    margin-bottom: 12px;
  }
  .tab {
    background: transparent; border: 0;
    color: var(--text-dim);
    padding: 8px 14px; cursor: pointer;
    font: inherit; font-size: 13px;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
  }
  .tab:hover { color: var(--text); }
  .tab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
  .code-wrap { position: relative; }
  pre.code {
    background: #0F172A;
    border-radius: var(--radius-sm);
    padding: 16px 18px;
    overflow-x: auto; margin: 0;
    font-family: var(--font-mono); font-size: 12.5px;
    line-height: 1.6; color: #D4D8E0;
    max-height: 380px;
  }
  pre.code .k { color: #7C9CFF; }
  pre.code .v { color: #F9C977; }
  pre.code .c { color: #6B7280; font-style: italic; }
  pre.code .s { color: #8EE0A1; }
  .code-copy { position: absolute; top: 10px; right: 10px; }

  /* ==========================================================
     COLOR LIBRARY
     ========================================================== */

  .library-head {
    display: flex; align-items: end; justify-content: space-between;
    gap: 20px; flex-wrap: wrap;
    margin: 40px 0 16px;
  }
  .library-head h2 {
    margin: 0; font-size: 28px; font-weight: 700;
    letter-spacing: -0.02em;
  }
  .library-head p { margin: 4px 0 0; color: var(--text-dim); font-size: 14px; }
  .library-search { min-width: 240px; flex: 1; max-width: 340px; }

  .family-nav {
    display: flex; flex-wrap: wrap; gap: 6px;
    padding: 12px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    position: sticky; top: 0; z-index: 10;
  }
  .family-nav a {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 12px;
    background: var(--panel-2);
    color: var(--text-dim);
    border: 1px solid var(--line);
    border-radius: 999px;
    font-size: 12px; font-weight: 600;
    text-decoration: none;
    transition: all .12s ease;
  }
  .family-nav a:hover {
    color: var(--text);
    border-color: var(--line-2);
    background: var(--panel);
  }
  .family-nav a .dot {
    width: 10px; height: 10px; border-radius: 50%;
    border: 1px solid rgba(0,0,0,.1);
  }

  .family {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    margin-bottom: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    scroll-margin-top: 80px;
  }
  .family-banner {
    padding: 20px 22px;
    color: #fff;
    display: flex; align-items: center; justify-content: space-between;
    gap: 16px; flex-wrap: wrap;
  }
  .family-banner h3 {
    margin: 0; font-size: 20px; font-weight: 700;
    letter-spacing: -0.01em;
  }
  .family-banner .meta {
    font-family: var(--font-mono); font-size: 12px;
    opacity: .85; letter-spacing: .04em;
  }
  .family-banner.on-light { color: #1A202C; }

  .color-table {
    width: 100%; border-collapse: collapse;
    font-size: 13px;
  }
  .color-table thead th {
    text-align: left;
    padding: 12px 16px;
    background: var(--panel-2);
    color: var(--text-mute);
    font-size: 11px; font-weight: 700;
    text-transform: uppercase; letter-spacing: .06em;
    border-bottom: 1px solid var(--line);
  }
  .color-table tbody tr {
    border-bottom: 1px solid var(--line);
    transition: background .1s;
  }
  .color-table tbody tr:last-child { border-bottom: 0; }
  .color-table tbody tr:hover { background: var(--panel-2); }
  .color-table td { padding: 10px 16px; vertical-align: middle; }
  .color-table td.chip-col { width: 60px; padding-right: 0; }
  .color-chip {
    display: block;
    width: 40px; height: 40px;
    border-radius: 6px;
    border: 1px solid rgba(0,0,0,.08);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.15);
  }
  .color-table td.name-col button {
    background: transparent; border: 0; padding: 0; margin: 0;
    color: var(--text);
    font: inherit; font-size: 14px; font-weight: 600;
    cursor: pointer; text-align: left;
  }
  .color-table td.name-col button:hover  { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
  .color-table td.name-col button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
  .code-cell {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-dim);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    display: inline-block;
    transition: all .1s;
  }
  .code-cell:hover  { background: var(--panel-2); color: var(--text); }
  .code-cell:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
  .use-btn {
    font-size: 11px; padding: 5px 10px;
    background: transparent;
    border: 1px solid var(--line-2);
    color: var(--text-dim);
    border-radius: 999px;
    cursor: pointer; font-weight: 600;
    letter-spacing: .04em; text-transform: uppercase;
  }
  .use-btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

  @media (max-width: 640px) {
    .color-table thead { display: none; }
    .color-table, .color-table tbody, .color-table tr, .color-table td { display: block; width: 100%; }
    .color-table tr {
      display: grid;
      grid-template-columns: 56px 1fr auto;
      gap: 4px 12px;
      padding: 10px 12px;
      align-items: center;
    }
    .color-table td { padding: 0; }
    .color-table td.chip-col { grid-row: span 2; }
    .color-table td.name-col { align-self: end; }
    .color-table td.code-col { grid-column: 2 / span 2; align-self: start; }
    .color-table td.action-col { grid-row: 1; grid-column: 3; }
    .color-table td.hide-sm { display: none; }
  }

  .no-results {
    padding: 30px;
    text-align: center;
    color: var(--text-mute);
    font-size: 14px;
  }

  /* ---------- Toast ---------- */
  .toast {
    position: fixed; bottom: 24px; left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--text);
    color: #fff;
    padding: 10px 18px;
    border-radius: 999px;
    font-size: 13px;
    box-shadow: 0 6px 24px rgba(0,0,0,.2);
    opacity: 0; pointer-events: none;
    transition: opacity .2s, transform .2s;
    z-index: 100;
  }
  .toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
  .toast .dot {
    display: inline-block; width: 6px; height: 6px;
    border-radius: 50%; background: #4ADE80;
    margin-right: 8px; vertical-align: middle;
  }

  footer.foot {
    margin-top: 40px;
    padding: 24px 0;
    border-top: 1px solid var(--line);
    color: var(--text-mute); font-size: 12px;
    text-align: center;
  }

  .skip {
    position: absolute; left: -9999px;
    background: var(--accent); color: #fff;
    padding: 8px 12px; border-radius: 4px; z-index: 200;
  }
  .skip:focus { left: 12px; top: 12px; }
  :focus-visible { outline-offset: 2px; }

/* externalised inline-style utilities — CSP style-src 'self' */
.u-mt16-mb0{margin-top:16px;margin-bottom:0}
.u-mt14{margin-top:14px}
.u-mt0{margin-top:0}
.u-m0{margin:0}

/* action column right-align (was an inline style, now CSP-safe) */
.color-table td.action-col { text-align: right; }