@layer reset, tokens, base, components;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  fieldset { border: none; padding: 0; margin: 0; }
  legend { padding: 0; }
  dd { margin: 0; }

  .sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
}

@layer tokens {
  :root {
    --bg:       hsl(214, 25%, 5%);
    --surface:  hsl(215, 11%, 3%);
    --surface2: hsl(214, 4%, 5%);
    --border:   hsl(214, 35%, 22%);
    --border2:  hsl(214, 10%, 25%);
    --text:     hsl(215, 25%, 85%);
    --text2:    hsl(215, 25%, 85%);
    --text3:    hsl(216, 15%, 60%);
    --accent:   hsl(22, 100%, 62%);
    --accent2:  hsl(22, 100%, 78%);
    --danger:   hsl(0, 100%, 71%);
    --pass-a:   hsl(41, 100%, 65%);
    --pass-aa:  hsl(153, 100%, 55%);
    --pass-aaa: hsl(201, 100%, 65%);
    --mono:     'Courier New', Courier, monospace;
    --sans:     system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --radius:    0.625rem;
    --radius-sm: 0.375rem;
    --fs-xs:    0.75rem;
    --fs-sm:    0.9rem;
    --fs-base:  1rem;
    --fs-md:    1.125rem;
    --fs-xl:    3rem;
    --ls-tight:  0.02em;
    --ls-normal: 0.04em;
    --ls-wide:   0.06em;
  }
}

@layer base {
  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: var(--fs-base);
    min-height: 100vh;
    display: grid;
    grid-template-columns: 20rem 1fr;
    grid-template-rows: 4.5rem 1fr auto;
  }

  main {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
  }

  input[type=range] {
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    height: 0.25rem;
    background: var(--border);
    border-radius: 0.125rem;
    outline: none;
    cursor: pointer;
  }

  input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 0.9375rem; height: 0.9375rem;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg);
    cursor: pointer;
    transition: transform 0.1s;
  }

  input[type=range]::-webkit-slider-thumb:hover { transform: scale(1.2); }

  ::-webkit-scrollbar { width: 5px; height: 5px; }
  ::-webkit-scrollbar-track { background: transparent; }
  ::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
}

@layer components {
  /* ── Shared panel style ── */
  .sidebar__section,
  .accordion,
  .preview__stage,
  .readability,
  .metrics__item,
  .pairs__card,
  .code {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color 0.2s;
  }

  .sidebar__section:hover,
  .preview__stage:hover,
  .readability:hover,
  .metrics__item:hover,
  .pairs__card:hover,
  .code:hover { border-color: var(--accent); }

  /* ── Shared btn accent ── */
  .import__btn,
  .code__copy {
    background: var(--accent);
    color: var(--surface);
    border: 2px solid var(--accent);
    border-radius: var(--radius-sm);
    font-family: var(--sans);
    font-size: var(--fs-base);
    font-weight: 600;
    letter-spacing: var(--ls-normal);
    padding: 0.5rem 1.125rem;
    cursor: pointer;
    transition: transform 0.1s, opacity 0.2s;
  }

  .import__btn:hover,
  .code__copy:hover { transform: scale(1.03); opacity: 0.9; }
  .import__btn:active { transform: scale(0.98); }

  /* ── Eyebrow / section title ── */
  .sidebar__title {
    font-size: var(--fs-base);
    font-weight: 400;
    letter-spacing: var(--ls-normal);
    color: var(--accent);
  }

  /* ── Header ── */
  .header {
    grid-column: 1 / -1;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    gap: 0.75rem;
    background: var(--bg);
    z-index: 100;
  }

  .header__brand {
    font-size: var(--fs-base);
    font-weight: 600;
    letter-spacing: var(--ls-wide);
    color: var(--text);
  }

  .header__sep { flex: 1; }

  .header__theme-label {
    font-size: var(--fs-base);
    color: var(--text3);
    font-family: var(--mono);
  }

  .header__theme-select {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: var(--fs-base);
    padding: 0.35rem 0.5rem;
    outline: none;
    cursor: pointer;
    font-family: var(--sans);
  }

  .header__custom-colors {
    display: none;
    align-items: center;
    gap: 0.375rem;
  }

  .header__custom-colors.is-visible { display: flex; }

  .header__custom-colors input[type="color"] {
    width: 1.75rem; height: 1.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0;
    cursor: pointer;
    background: none;
  }

  .header__custom-colors input[type="color"]::-webkit-color-swatch-wrapper { padding: 1px; }
  .header__custom-colors input[type="color"]::-webkit-color-swatch { border: none; border-radius: 2px; }

  /* ── Sidebar ── */
  .sidebar {
    background-color: var(--bg);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    padding: 1rem;
    display: grid;
    align-items: start;
    align-content: start;
    gap: 1rem;
  }

  .sidebar__section {
    padding: 1rem;
    display: grid;
    gap: 0.5rem;
  }

  /* ── Accordion ── */
  .accordion { display: grid; align-content: center; }

  .accordion__toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    border: none;
    background: none;
    padding: 1rem;
    cursor: pointer;
    text-align: left;
  }

  .accordion__icon {
    font-size: var(--fs-md);
    color: var(--accent);
    transition: transform 0.2s;
  }

  .accordion.is-open .accordion__icon { transform: rotate(45deg); }

  .accordion__body {
    padding: 0 1rem 1rem;
    display: none;
    background: var(--surface);
    border-top: 1px solid var(--border);
  }

  .accordion.is-open .accordion__body {
    display: grid;
    gap: 1rem;
    padding: 1rem;
  }

  .accordion__body .sidebar__title { font-size: var(--fs-base); margin-top: 0.75rem; }
  .accordion__body .sidebar__title:first-child { margin-top: 0; }

  /* ── Import ── */
  .import__url {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--mono);
    font-size: var(--fs-base);
    padding: 0.55rem 0.75rem;
    resize: none;
    min-height: 5.5rem;
    outline: none;
    transition: border-color 0.2s;
    line-height: 1.5;
  }

  .import__url::placeholder { color: var(--text3); }
  .import__url:focus { border-color: var(--accent); }
  .import__url.is-error { border-color: var(--danger); }
  .import__url.is-ok { border-color: var(--accent); }

  .import__status {
    font-size: var(--fs-base);
    margin-top: 0.375rem;
    font-family: var(--mono);
    color: var(--accent);
  }

  .import__status.is-err { color: var(--danger); }

  .import__family {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--mono);
    font-size: var(--fs-base);
    padding: 0.55rem 0.75rem;
    outline: none;
    transition: border-color 0.2s;
  }

  .import__family::placeholder { color: var(--text3); }
  .import__family:focus,
  .import__family.is-active { border-color: var(--accent); }

  .import__btn { margin-top: 0.5rem; width: 100%; }
  .import__btn.is-loading { pointer-events: none; opacity: 0.7; }

  .import__btn.is-loading::after {
    content: '';
    display: inline-block;
    width: 0.75rem; height: 0.75rem;
    border: 2px solid var(--surface);
    border-top-color: transparent;
    border-radius: 50%;
    margin-left: 0.5rem;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
  }

  @keyframes spin { to { transform: rotate(360deg); } }

  .import__drop {
    border: 2px dashed var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    font-family: var(--mono);
    font-size: var(--fs-base);
    color: var(--text3);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
  }

  .import__drop:hover,
  .import__drop.is-dragover {
    border-color: var(--accent);
    background: hsla(22, 100%, 62%, 0.05);
  }

  .import__drop-hint { opacity: 0.6; }

  /* ── Controls ── */
  .ctrl { margin-bottom: 0.625rem; }
  .ctrl:last-child { margin-bottom: 0; }

  .ctrl__label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.375rem;
  }

  .ctrl__label span:first-child {
    font-size: var(--fs-base);
    color: var(--text);
    font-family: var(--mono);
  }

  .ctrl__value {
    font-size: var(--fs-base);
    color: var(--accent);
    font-family: var(--mono);
    background: hsla(22, 100%, 62%, 0.08);
    padding: 0.0625rem 0.5rem;
    border-radius: var(--radius-sm);
  }

  /* ── Toggle ── */
  .toggle-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .toggle {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    cursor: pointer;
  }

  .toggle__input { display: none; }

  .toggle__track {
    width: 2rem; height: 1.125rem;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 0.5625rem;
    position: relative;
    transition: background 0.2s, border-color 0.2s;
    flex-shrink: 0;
  }

  .toggle__track::after {
    content: '';
    position: absolute;
    width: 0.75rem; height: 0.75rem;
    border-radius: 50%;
    background: var(--text3);
    top: 2px; left: 2px;
    transition: transform 0.2s, background 0.2s;
  }

  .toggle__input:checked + .toggle__track {
    background: hsla(22, 100%, 62%, 0.15);
    border-color: var(--accent);
  }

  .toggle__input:checked + .toggle__track::after {
    transform: translateX(14px);
    background: var(--accent);
  }

  .toggle__label {
    font-size: var(--fs-base);
    color: var(--text);
    font-family: var(--mono);
  }

  .toggle__tip {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.125rem; height: 1.125rem;
    border-radius: 50%;
    background: var(--surface);
    border: 1px solid var(--border2);
    color: var(--text3);
    font-size: var(--fs-xs);
    font-family: var(--sans);
    font-weight: 600;
    cursor: help;
    flex-shrink: 0;
    margin-left: auto;
    transition: border-color 0.15s, color 0.15s;
  }

  .toggle__tip:hover { border-color: var(--accent); color: var(--accent); }

  .toggle__tip::after {
    content: attr(data-tip);
    position: absolute;
    bottom: calc(100% + 0.5rem);
    right: 0;
    width: max-content;
    max-width: 17rem;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: var(--fs-base);
    font-family: var(--sans);
    font-weight: 400;
    line-height: 1.5;
    padding: 0.625rem 0.75rem;
    z-index: 50;
    opacity: 0;
    pointer-events: none;
    transform: translateY(4px);
    transition: opacity 0.15s, transform 0.15s;
  }

  .toggle__tip:hover::after {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  /* ── Actions ── */
  .actions {
    margin-top: 1.25rem;
    display: flex;
    gap: 0.625rem;
  }

  .actions__btn {
    flex: 1;
    width: 100%;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text3);
    font-size: var(--fs-base);
    padding: 0.5rem 1.125rem;
    cursor: pointer;
    font-family: var(--sans);
    font-weight: 500;
    letter-spacing: var(--ls-normal);
    transition: transform 0.1s, opacity 0.2s;
  }

  .actions__btn:hover {
    border-color: var(--accent);
    background-color: var(--accent);
    color: var(--surface);
    transform: scale(1.03);
    opacity: 0.9;
  }

  .actions__btn--share { border-color: var(--accent); color: var(--accent); }

  /* ── Help tab ── */
  .help {
    display: grid;
    gap: 1.75rem;
    width: min(100%, 45rem);
  }

  .help__heading {
    font-size: var(--fs-md);
    font-weight: 500;
    letter-spacing: var(--ls-tight);
    color: var(--text);
  }

  .help__text {
    font-size: var(--fs-base);
    color: var(--text2);
    line-height: 1.65;
  }

  .help__shortcuts {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
    gap: 0.5rem;
  }

  .help__shortcut {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: var(--fs-base);
    color: var(--text2);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.625rem 0.875rem;
  }

  .help__key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.75rem;
    height: 1.75rem;
    padding: 0 0.5rem;
    background: var(--surface2);
    border: 1px solid var(--border2);
    border-radius: var(--radius-sm);
    font-family: var(--mono);
    font-size: var(--fs-base);
    font-weight: 600;
    color: var(--accent);
    flex-shrink: 0;
  }

  .help__list {
    list-style: none;
    display: grid;
    gap: 0.625rem;
  }

  .help__item {
    font-size: var(--fs-base);
    color: var(--text2);
    line-height: 1.6;
    padding-left: 1.25rem;
    position: relative;
  }

  .help__item::before {
    content: '\2022';
    position: absolute;
    left: 0;
    color: var(--accent);
  }

  /* ── Tipo cards ── */
  .tipo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr));
    gap: 0.625rem;
  }

  .tipo-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.875rem;
    display: grid;
    align-items: start;
    gap: 0.5rem;
  }

  .tipo-card__label {
    font-size: var(--fs-xs);
    font-weight: 600;
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
    font-family: var(--mono);
    padding: 0.25rem 1rem;
    border-radius: var(--radius-sm);
    width: fit-content;
  }

  .tipo-card--green .tipo-card__label {
    background: hsla(153, 39%, 49%, 0.12);
    border: 1px solid hsla(153, 39%, 49%, 0.3);
    color: var(--pass-aa);
  }

  .tipo-card--blue .tipo-card__label {
    background: hsla(201, 64%, 53%, 0.12);
    border: 1px solid hsla(201, 64%, 53%, 0.3);
    color: var(--pass-aaa);
  }

  .tipo-card__text {
    font-size: var(--fs-base);
    color: var(--text2);
    line-height: 1.55;
  }

  /* ── Toast ── */
  .toast {
    position: fixed;
    bottom: 1.5rem; left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: var(--surface2);
    border: 1px solid var(--border);
    color: var(--text);
    font-family: var(--mono);
    font-size: var(--fs-base);
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-sm);
    z-index: 9999;
    opacity: 0;
    transition: transform 0.25s ease, opacity 0.25s ease;
    pointer-events: none;
  }

  .toast.is-visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }

  /* ── Empty state ── */
  .empty {
    text-align: center;
    padding: 3.75rem 1.25rem;
    color: var(--text3);
    font-family: var(--mono);
    font-size: var(--fs-base);
    line-height: 1.6;
  }

  .empty__title {
    color: var(--accent);
    font-size: var(--fs-base);
    margin-bottom: 0.5rem;
    display: block;
  }

  .empty__text { margin-bottom: 0.25rem; }

  /* ── Tabs ── */
  .tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    padding: 0 1.5rem;
    flex-shrink: 0;
  }

  .tabs__item {
    font-size: var(--fs-base);
    font-weight: 500;
    letter-spacing: var(--ls-normal);
    color: var(--text3);
    padding: 0.875rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: color 0.15s, border-color 0.15s;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
  }

  .tabs__item:hover { color: var(--text); }
  .tabs__item.is-active { color: var(--accent); border-bottom-color: var(--accent); }

  .tabs__content {
    flex: 1;
    overflow-y: auto;
    padding: 1.75rem 2rem;
  }

  .tabs__panel { display: none; }
  .tabs__panel.is-active { display: block; }

  /* ── Preview ── */
  .preview__selector {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
  }

  .preview__selector-label {
    font-size: var(--fs-base);
    color: var(--text3);
    font-family: var(--mono);
  }

  .preview__selector select {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: var(--fs-base);
    padding: 0.5rem;
    outline: none;
    cursor: pointer;
    font-family: var(--sans);
  }

  .preview__font-name {
    font-size: var(--fs-base);
    color: var(--text3);
    font-family: var(--mono);
    letter-spacing: var(--ls-normal);
    margin-bottom: 0.625rem;
  }

  .preview__stage {
    padding: 1.75rem;
    margin-bottom: 1rem;
    position: relative;
    overflow: hidden;
  }

  .preview__stage::before {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
      0deg,
      transparent, transparent 23px,
      rgba(255,255,255,0.02) 23px, rgba(255,255,255,0.02) 24px
    );
    pointer-events: none;
  }

  .preview__el {
    position: relative;
    color: var(--text);
    cursor: text;
    word-break: break-word;
    margin-bottom: 1rem;
    opacity: 0.7;
    transition: opacity 0.2s;
  }

  .preview__el.is-active {
    outline: none;
    opacity: 1;
  }

  .preview__el:not(.is-active) { cursor: default; }
  .preview__el:not(.is-active):hover { opacity: 1; }

  #el-h1 { font-size: 3rem; font-weight: 300; line-height: 1.2; min-height: 5rem; }
  #el-h2 { font-size: 2rem; font-weight: 500; line-height: 1.3; min-height: 3rem; }
  #el-p  { font-size: var(--fs-base); font-weight: 500; line-height: 1.65; min-height: 3rem; max-width: 40rem; }

  .preview__hint {
    position: absolute;
    bottom: 0.625rem; right: 0.875rem;
    font-size: var(--fs-base);
    color: var(--accent);
    font-family: var(--mono);
    letter-spacing: var(--ls-normal);
  }

  /* ── Readability ── */
  .readability {
    display: flex;
    gap: 1.25rem;
    margin-bottom: 0.625rem;
    padding: 0.875rem 1.25rem;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    align-items: center;
    transition: all 0.3s;
  }

  .readability.is-ok {
    background: hsla(153, 39%, 49%, 0.07);
    border-color: hsla(153, 39%, 49%, 0.3);
    color: var(--pass-aa);
  }

  .readability.is-warn {
    background: hsla(41, 100%, 47%, 0.07);
    border-color: hsla(41, 100%, 47%, 0.3);
    color: var(--pass-a);
  }

  .readability.is-bad {
    background: hsla(0, 100%, 71%, 0.06);
    border-color: hsla(0, 100%, 71%, 0.18);
    color: var(--danger);
    opacity: 0.6;
  }

  .readability__icon { font-size: var(--fs-base); }

  .readability.is-ok .readability__icon::before { content: '\2713'; }
  .readability.is-warn .readability__icon::before { content: '\26A0'; }
  .readability.is-bad .readability__icon::before { content: '\2717'; }

  .readability__status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
  }

  .readability__level {
    font-family: var(--mono);
    font-size: var(--fs-base);
    font-weight: 500;
    letter-spacing: var(--ls-tight);
  }

  .readability__rec {
    flex: 1;
    font-size: var(--fs-base);
    color: var(--text);
    font-family: var(--mono);
  }

  /* ── Metrics ── */
  .metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.625rem;
    margin-bottom: 1rem;
  }

  .metrics__item {
    padding: 0.75rem 0.875rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all 0.3s;
  }

  .metrics__item--ls { border-color: hsla(22, 100%, 62%, 0.3); background: hsla(22, 100%, 62%, 0.05); }
  .metrics__item--fk { border-color: hsla(153, 39%, 49%, 0.3); background: hsla(153, 39%, 49%, 0.05); }
  .metrics__item--lig { border-color: hsla(201, 64%, 53%, 0.3); background: hsla(201, 64%, 53%, 0.05); }
  .metrics__item--tr { border-color: hsla(41, 100%, 47%, 0.3); background: hsla(41, 100%, 47%, 0.05); }

  .metrics__label {
    font-size: var(--fs-base);
    font-size: var(--fs-xs);
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 0.25rem;
  }

  .metrics__value {
    font-size: var(--fs-md);
    font-weight: 600;
    font-family: var(--mono);
  }

  .metrics__item--ls .metrics__value { color: var(--accent); }
  .metrics__item--fk .metrics__value { color: var(--pass-aa); }
  .metrics__item--lig .metrics__value { color: var(--pass-aaa); }
  .metrics__item--tr .metrics__value { color: var(--pass-a); }

  /* ── Pairs ── */
  .pairs__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.625rem;
    margin-bottom: 1rem;
  }

  .pairs__card { padding: 1.25rem; text-align: center; }

  .pairs__card-title {
    font-size: var(--fs-base);
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 0.875rem;
  }

  .pairs__row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
  }

  .pairs__item { text-align: center; }

  .pairs__label {
    font-size: var(--fs-base);
    color: var(--text3);
    margin-bottom: 0.25rem;
    font-family: var(--mono);
  }

  .pairs__glyph {
    font-size: 2.25rem;
    font-weight: 700;
    line-height: 1;
    color: var(--text);
  }

  .pairs__divider {
    width: 1px; height: 3rem;
    background: var(--border);
  }

  /* ── Code ── */
  .code { overflow: hidden; margin-bottom: 0.625rem; }

  .code__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.625rem 1rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface2);
  }

  .code__header-text {
    font-size: var(--fs-base);
    color: var(--text3);
    font-family: var(--mono);
  }

  .code__copy { padding: 0.5rem 1.125rem; }

  .code__pre {
    padding: 1rem 1.125rem;
    font-family: var(--mono);
    font-size: var(--fs-base);
    line-height: 1.7;
    overflow-x: auto;
    color: var(--text);
  }

  .code__prop  { color: var(--accent2); }
  .code__val   { color: var(--accent); }
  .code__sep   { color: var(--text3); }
  .code__cmt   { color: hsl(214, 4%, 35%); }

  /* ── Footer ── */
  .footer {
    position: sticky;
    bottom: 0;
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 2rem 1.5rem;
    background: var(--surface);
    border-top: 1px solid var(--border);
    font-family: var(--mono);
    font-size: var(--fs-sm);
    color: var(--text3);
  }

  .footer__brand {
    display: flex;
    align-items: center;
  }

  .footer__name {
    color: var(--text2);
    font-weight: 500;
    display: flex;
    align-items: center;
    line-height: 1;
  }

  .footer__logo {
    display: block;
    width: 2rem;
    aspect-ratio: 1;
    border-radius: 100%;
    margin-right: 0.625rem;
  }

  .footer__link {
    color: var(--text3);
    text-decoration: none;
    word-break: break-all;
    transition: color 0.2s;
  }

  .footer__link:hover { color: var(--accent); }

  /* ── Hamburger / Drawer ── */
  .hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 2.25rem; height: 2.25rem;
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 0.375rem;
    flex-shrink: 0;
  }

  .hamburger__line {
    display: block;
    width: 100%; height: 2px;
    background: var(--text);
    border-radius: 1px;
    transition: transform 0.2s, opacity 0.2s;
  }

  .hamburger.is-active .hamburger__line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .hamburger.is-active .hamburger__line:nth-child(2) { opacity: 0; }
  .hamburger.is-active .hamburger__line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .drawer-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 199;
  }

  .drawer-overlay.is-active { display: block; }

  /* ── TABLET ≤768px ── */
  @media (max-width: 768px) {
    body {
      grid-template-columns: 1fr;
      grid-template-rows: 4rem 1fr auto;
    }

    .header { padding: 0 1rem; }
    .hamburger { display: flex; }

    .sidebar {
      position: fixed;
      top: 0; left: 0;
      width: 20rem;
      min-height: 100vh;
      z-index: 200;
      transform: translateX(-100%);
      transition: transform 0.25s ease;
      background: var(--bg);
    }

    .sidebar.is-open { transform: translateX(0); }

    main { min-height: 0; }

    .tabs__content { padding: 1.25rem; }

    .pairs__grid { grid-template-columns: repeat(2, 1fr); }

    .metrics { grid-template-columns: repeat(2, 1fr); }
  }

  /* ── MOBILE ≤480px ── */
  @media (max-width: 480px) {
    .header { padding: 0 0.75rem; }

    .sidebar { width: 100%; }

    .tabs__content { padding: 0.75rem; }

    .tabs {
      padding: 0 0.5rem;
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }

    .tabs::-webkit-scrollbar { display: none; }

    .tabs__item {
      padding: 0.75rem 0.6rem;
      white-space: nowrap;
      flex-shrink: 0;
    }

    .preview__stage { padding: 1.25rem; }

    #el-h1 { font-size: 2rem; }

    .pairs__grid { grid-template-columns: 1fr; }

    .metrics {
      grid-template-columns: 1fr 1fr;
      gap: 0.375rem;
    }

    .metrics__item { padding: 0.5rem 0.625rem; }
    .metrics__value { font-size: var(--fs-base); }

    .readability {
      flex-direction: column;
      align-items: flex-start;
      gap: 0.625rem;
    }

    .code__pre {
      font-size: var(--fs-base);
      padding: 0.75rem;
    }

    input[type=range] { height: 6px; }
    input[type=range]::-webkit-slider-thumb { width: 22px; height: 22px; }

    .toggle__track { width: 2.4rem; height: 22px; }
    .toggle__track::after { width: 16px; height: 16px; }
    .toggle__input:checked + .toggle__track::after { transform: translateX(16px); }
  }
}