/* ==========================================================================
   Trace Machine — application styles
   Plain CSS, no framework. Layers keep specificity predictable:
   reset → tokens → base → layout → components → report → utilities
   ========================================================================== */

@layer reset, tokens, base, layout, components, report, utilities;

/* -------------------------------------------------------------------------- */
@layer reset {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }
  html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
  }
  body,
  h1, h2, h3, h4, h5, h6,
  p, figure, blockquote, dl, dd, pre {
    margin: 0;
  }
  ul, ol {
    margin: 0;
    padding: 0;
  }
  img, svg, video {
    display: block;
    max-width: 100%;
  }
  input, button, textarea, select {
    font: inherit;
    color: inherit;
  }
  button {
    cursor: pointer;
  }
  [hidden] {
    display: none !important;
  }
}

/* -------------------------------------------------------------------------- */
@layer tokens {
  :root {
    color-scheme: light;

    --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, "Cascadia Mono", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    --font-brand: "Quando", Georgia, "Times New Roman", serif;

    --text-xs: 0.75rem;
    --text-sm: 0.8125rem;
    --text-md: 0.9375rem;
    --text-lg: 1.0625rem;
    --text-xl: 1.375rem;
    --text-2xl: 1.75rem;

    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --space-6: 2rem;
    --space-7: 3rem;

    --radius-sm: 3px;
    --radius: 5px;
    --container: 76rem;
    --hairline: 1px solid var(--border);

    /* Light palette */
    --bg: #f6f6f3;
    --surface: #ffffff;
    --surface-2: #efefeb;
    --border: #dddcd6;
    --border-strong: #c3c2bb;
    --text: #1c1e1f;
    --text-2: #55595b;
    --text-3: #83878a;

    --accent: #1a7676;
    --accent-strong: #125858;
    --accent-bg: #e2efee;
    --on-accent: #ffffff;
    --focus: #2ca0a0;

    --found: var(--accent);
    --found-bg: var(--accent-bg);
    --action: #93600b;
    --action-bg: #f8eed9;
    --error: #b42318;
    --error-bg: #fbe9e7;

    --vote-real: #2e7a4d;
    --vote-edited: #a16207;
    --vote-ai: #b0304a;

    --shadow-pop: 0 10px 30px -10px rgb(0 0 0 / 0.25), 0 2px 6px rgb(0 0 0 / 0.08);
    --checker: #e9e9e5;
  }

  :root[data-theme="dark"] {
    color-scheme: dark;

    --bg: #111313;
    --surface: #171a1a;
    --surface-2: #1f2323;
    --border: #2a2f2f;
    --border-strong: #3a4141;
    --text: #e3e6e5;
    --text-2: #a2a9a7;
    --text-3: #747b79;

    --accent: #3fb3ad;
    --accent-strong: #62c9c3;
    --accent-bg: #142e2d;
    --on-accent: #06201f;
    --focus: #3fb3ad;

    --action: #e3a743;
    --action-bg: #2d2412;
    --error: #f07b70;
    --error-bg: #34191a;

    --vote-real: #5dbd83;
    --vote-edited: #e3a743;
    --vote-ai: #eb7189;

    --shadow-pop: 0 10px 30px -10px rgb(0 0 0 / 0.7), 0 2px 6px rgb(0 0 0 / 0.4);
    --checker: #1d2121;
  }

  /* Before theme.js runs (or without JS), follow the system preference. */
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
      color-scheme: dark;
      --bg: #111313;
      --surface: #171a1a;
      --surface-2: #1f2323;
      --border: #2a2f2f;
      --border-strong: #3a4141;
      --text: #e3e6e5;
      --text-2: #a2a9a7;
      --text-3: #747b79;
      --accent: #3fb3ad;
      --accent-strong: #62c9c3;
      --accent-bg: #142e2d;
      --on-accent: #06201f;
      --action: #e3a743;
      --action-bg: #2d2412;
      --error: #f07b70;
      --error-bg: #34191a;
      --vote-real: #5dbd83;
      --vote-edited: #e3a743;
      --vote-ai: #eb7189;
      --checker: #1d2121;
    }
  }
}

/* -------------------------------------------------------------------------- */
@layer base {
  html {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-ui);
    font-size: 100%;
    line-height: 1.55;
    scroll-padding-top: var(--space-5);
  }
  body {
    font-size: var(--text-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
  }

  h1, h2, h3, h4, h5 {
    line-height: 1.25;
    font-weight: 600;
    text-wrap: balance;
  }
  h1 { font-size: var(--text-2xl); }
  h2 { font-size: var(--text-xl); }
  h3 { font-size: var(--text-lg); }
  h4, h5 { font-size: var(--text-md); }

  p { text-wrap: pretty; }
  p + p { margin-top: var(--space-3); }

  ul, ol { padding-left: 1.25rem; }
  li + li { margin-top: var(--space-1); }

  a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.18em;
    text-decoration-color: color-mix(in srgb, currentColor 45%, transparent);
  }
  a:hover {
    color: var(--accent-strong);
    text-decoration-color: currentColor;
  }

  code, pre, kbd, samp {
    font-family: var(--font-mono);
    font-size: 0.875em;
  }
  code {
    background: var(--surface-2);
    padding: 0.05em 0.3em;
    border-radius: var(--radius-sm);
    overflow-wrap: anywhere;
  }
  pre {
    background: var(--surface-2);
    border: var(--hairline);
    border-radius: var(--radius);
    padding: var(--space-3);
    overflow: auto;
    max-height: 28rem;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    font-size: var(--text-xs);
    line-height: 1.5;
  }
  pre code { background: none; padding: 0; }
  kbd {
    border: var(--hairline);
    border-bottom-width: 2px;
    border-radius: var(--radius-sm);
    padding: 0 0.3em;
    background: var(--surface);
    font-size: 0.8em;
  }

  hr {
    border: 0;
    border-top: var(--hairline);
    margin: var(--space-4) 0;
  }

  small { font-size: var(--text-sm); }
  strong { font-weight: 600; }
  abbr[title] { text-decoration: underline dotted; cursor: help; }

  table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-sm);
  }
  th, td {
    text-align: left;
    vertical-align: top;
    padding: var(--space-2) var(--space-3);
    border-bottom: var(--hairline);
  }
  th {
    font-weight: 600;
    color: var(--text-2);
  }

  :focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 2px;
  }

  details > summary {
    cursor: pointer;
  }

  ::selection {
    background: color-mix(in srgb, var(--accent) 30%, transparent);
  }

  /* Scrollbars: thin, theme-colored. `scrollbar-color` is the standard;
     the ::-webkit-scrollbar rules only apply where it isn't supported. */
  html {
    scrollbar-color: var(--border-strong) transparent;
  }
  * {
    scrollbar-width: thin;
  }
  /* Only where `scrollbar-width` is unsupported, so Safari keeps its native
     overlay scrollbars instead of forced always-visible ones. */
  @supports not (scrollbar-width: thin) {
    ::-webkit-scrollbar { width: 10px; height: 10px; }
    ::-webkit-scrollbar-track { background: transparent; }
    ::-webkit-scrollbar-thumb {
      background: var(--border-strong);
      border: 2px solid transparent;
      border-radius: 999px;
      background-clip: padding-box;
    }
    ::-webkit-scrollbar-thumb:hover { background-color: var(--text-3); }
  }
}

/* -------------------------------------------------------------------------- */
@layer layout {
  .container {
    width: 100%;
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: var(--space-4);
  }
  @media (min-width: 48rem) {
    .container { padding-inline: var(--space-6); }
  }

  .site-main {
    flex: 1;
    padding-block: var(--space-5) var(--space-7);
  }

  /* Header ---------------------------------------------------------------- */
  .site-header {
    border-bottom: var(--hairline);
    background: var(--surface);
  }
  .site-header__inner {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    min-height: 3.5rem;
  }
  .brand {
    display: flex;
    align-items: baseline;
    gap: var(--space-3);
    text-decoration: none;
    color: inherit;
    flex-shrink: 0;
  }
  .brand:hover { color: inherit; }
  .brand__name {
    font-family: var(--font-brand);
    font-size: 1.3rem;
    color: var(--accent);
    line-height: 1;
    white-space: nowrap;
  }

  .site-nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    margin-left: auto;
  }
  .site-nav a,
  .site-nav button {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius);
    color: var(--text-2);
    text-decoration: none;
    font-size: var(--text-sm);
    background: none;
    border: 0;
    white-space: nowrap;
  }
  .site-nav a:hover,
  .site-nav button:hover {
    color: var(--text);
    background: var(--surface-2);
  }
  .site-nav a[aria-current="page"] {
    color: var(--text);
    font-weight: 600;
  }

  /* Compact intake in the header on non-home pages */
  .header-intake {
    flex: 1;
    max-width: 26rem;
    margin-left: var(--space-4);
  }
  @media (max-width: 48rem) {
    .header-intake { display: none; }
    .site-nav .nav-label { display: none; }
  }
  @media (max-width: 30rem) {
    .site-nav .nav-home { display: none; }
    .site-nav a,
    .site-nav button { padding-inline: var(--space-2); }
    .brand__name { font-size: 1.15rem; }
  }

  /* Footer ---------------------------------------------------------------- */
  .site-footer {
    border-top: var(--hairline);
    color: var(--text-3);
    font-size: var(--text-xs);
    padding-block: var(--space-4);
  }
  .site-footer .container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-5);
    justify-content: flex-end;
  }
  .site-footer a { color: inherit; }

  /* Page header ----------------------------------------------------------- */
  .page-head {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
  }
  .page-head h1 {
    font-family: var(--font-brand);
    font-weight: 400;
  }
  .page-head p {
    color: var(--text-2);
    margin-top: var(--space-1);
  }

  .stack > * + * { margin-top: var(--space-4); }
  .stack-sm > * + * { margin-top: var(--space-2); }
  .stack-lg > * + * { margin-top: var(--space-6); }

  .cluster {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
  }
}

/* -------------------------------------------------------------------------- */
@layer components {
  /* Icons ----------------------------------------------------------------- */
  .icon {
    width: 1em;
    height: 1em;
    flex-shrink: 0;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    display: inline-block;
    vertical-align: -0.125em;
  }
  .icon--brand {
    stroke: none;
    fill: currentColor;
  }
  .brand-google { color: #8e75b2; }
  .brand-meta { color: #0467df; }
  .brand-openai { color: var(--text); }
  :root[data-theme="dark"] .brand-google { color: #b49ce0; }
  :root[data-theme="dark"] .brand-meta { color: #4c9bff; }

  /* Buttons --------------------------------------------------------------- */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.45rem 0.9rem;
    min-height: 2.25rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
    font-size: var(--text-sm);
    font-weight: 500;
    line-height: 1.2;
    text-decoration: none;
    white-space: nowrap;
    transition: background-color 0.12s, border-color 0.12s, color 0.12s;
  }
  .btn:hover {
    background: var(--surface-2);
    color: var(--text);
    border-color: var(--text-3);
  }
  .btn:disabled,
  .btn[aria-disabled="true"] {
    opacity: 0.5;
    cursor: not-allowed;
  }
  .btn--primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--on-accent);
  }
  .btn--primary:hover {
    background: var(--accent-strong);
    border-color: var(--accent-strong);
    color: var(--on-accent);
  }
  .btn--ghost {
    border-color: transparent;
    background: transparent;
    color: var(--text-2);
  }
  .btn--ghost:hover {
    background: var(--surface-2);
    border-color: transparent;
  }
  .btn--sm {
    min-height: 1.875rem;
    padding: 0.3rem 0.65rem;
    font-size: var(--text-xs);
  }
  .btn--lg {
    min-height: 2.75rem;
    padding: 0.6rem 1.2rem;
    font-size: var(--text-md);
  }
  .btn--icon {
    padding: 0;
    width: 2.25rem;
  }
  .btn--icon.btn--sm { width: 1.875rem; }
  .btn .icon { font-size: 1.05em; }
  .btn[aria-pressed="true"] {
    border-color: var(--accent);
    background: var(--accent-bg);
    color: var(--accent-strong);
  }
  .htmx-request .btn[type="submit"],
  .btn.htmx-request {
    opacity: 0.6;
    pointer-events: none;
  }

  /* Form fields ------------------------------------------------------------ */
  .field {
    display: block;
    width: 100%;
    min-height: 2.25rem;
    padding: 0.45rem 0.7rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
    font-size: var(--text-md);
  }
  .field::placeholder { color: var(--text-3); }
  .field:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: -1px;
    border-color: transparent;
  }
  textarea.field {
    min-height: 10rem;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    resize: vertical;
  }
  .field-row {
    display: flex;
    gap: var(--space-2);
  }

  /* Selects: fully customizable dropdowns where `appearance: base-select`
     is supported, and a matching closed control everywhere else. */
  select:not([multiple]):not([size]) {
    appearance: none;
    min-height: 2.25rem;
    padding: 0.4rem 2rem 0.4rem 0.7rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    background-color: var(--surface);
    color: var(--text);
    font-size: var(--text-sm);
    cursor: pointer;
    /* Fallback chevron; hidden once the native picker icon is styleable. */
    background-image: linear-gradient(45deg, transparent 50%, var(--text-3) 50%),
      linear-gradient(135deg, var(--text-3) 50%, transparent 50%);
    background-position: right 0.95rem center, right 0.65rem center;
    background-size: 0.3rem 0.3rem;
    background-repeat: no-repeat;
  }
  select:not([multiple]):not([size]):hover { border-color: var(--text-3); }
  select:not([multiple]):not([size]):focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: -1px;
    border-color: transparent;
  }
  @supports (appearance: base-select) {
    select:not([multiple]):not([size]),
    ::picker(select) {
      appearance: base-select;
    }
    select:not([multiple]):not([size]) {
      display: inline-flex;
      align-items: center;
      gap: var(--space-2);
      padding-right: 0.6rem;
      background-image: none;
    }
    select::picker-icon {
      color: var(--text-3);
      transition: rotate 0.15s;
    }
    select:open::picker-icon { rotate: 180deg; }
    ::picker(select) {
      margin-block: 4px;
      padding: var(--space-1);
      border: var(--hairline);
      border-radius: var(--radius);
      background: var(--surface);
      color: var(--text);
      box-shadow: var(--shadow-pop);
    }
    select option {
      display: flex;
      align-items: center;
      gap: var(--space-2);
      padding: 0.35rem 0.6rem;
      border-radius: var(--radius-sm);
      font-size: var(--text-sm);
    }
    select option:hover,
    select option:focus-visible {
      background: var(--surface-2);
      outline: none;
    }
    select option:checked {
      color: var(--accent-strong);
      font-weight: 500;
    }
    select option::checkmark {
      order: 1;
      margin-left: auto;
      color: var(--accent);
    }
    select option:disabled { color: var(--text-3); }
  }
  .field-row .field { flex: 1; min-width: 0; }

  .switch {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    cursor: pointer;
    font-size: var(--text-sm);
  }
  .switch input {
    appearance: none;
    flex-shrink: 0;
    width: 2rem;
    height: 1.125rem;
    margin: 0.15rem 0 0;
    border-radius: 999px;
    background: var(--border-strong);
    position: relative;
    cursor: pointer;
    transition: background-color 0.15s;
  }
  .switch input::after {
    content: "";
    position: absolute;
    top: 2px;
    left: 2px;
    width: calc(1.125rem - 4px);
    height: calc(1.125rem - 4px);
    border-radius: 50%;
    background: var(--surface);
    transition: transform 0.15s;
  }
  .switch input:checked { background: var(--accent); }
  .switch input:checked::after { transform: translateX(0.875rem); }
  .switch small {
    display: block;
    color: var(--text-3);
    font-size: var(--text-xs);
  }

  .segmented {
    display: inline-flex;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    padding: 2px;
    gap: 2px;
    background: var(--surface);
  }
  .segmented label {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.7rem;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    cursor: pointer;
    color: var(--text-2);
  }
  .segmented input { position: absolute; opacity: 0; pointer-events: none; }
  .segmented label:has(input:checked) {
    background: var(--surface-2);
    color: var(--text);
    font-weight: 500;
  }
  .segmented label:has(input:focus-visible) {
    outline: 2px solid var(--focus);
  }

  /* Labels ---------------------------------------------------------------- */
  .eyebrow {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-3);
  }
  .muted { color: var(--text-2); }
  .faint { color: var(--text-3); }
  .mono { font-family: var(--font-mono); font-size: 0.9em; }

  /* Panels ---------------------------------------------------------------- */
  .panel {
    background: var(--surface);
    border: var(--hairline);
    border-radius: var(--radius);
    padding: var(--space-5);
  }

  /* Notices --------------------------------------------------------------- */
  .notice,
  .flash-warning {
    border-left: 3px solid var(--action);
    background: var(--action-bg);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
    color: var(--text);
  }
  .notice--info {
    border-left-color: var(--border-strong);
    background: var(--surface-2);
  }
  .notice--error {
    border-left-color: var(--error);
    background: var(--error-bg);
  }
  .notice > * + * { margin-top: var(--space-2); }

  /* Key/value lists -------------------------------------------------------- */
  .kv {
    display: grid;
    grid-template-columns: minmax(7rem, max-content) 1fr;
    gap: var(--space-1) var(--space-4);
    font-size: var(--text-sm);
  }
  .kv dt {
    color: var(--text-3);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    letter-spacing: 0.02em;
    padding-top: 0.12rem;
  }
  .kv dd {
    margin: 0;
    overflow-wrap: anywhere;
    min-width: 0;
  }
  @media (max-width: 30rem) {
    .kv { grid-template-columns: 1fr; gap: 0; }
    .kv dd + dt { margin-top: var(--space-2); }
  }

  /* Status pill & dot ---------------------------------------------------- */
  .dot {
    width: 0.625rem;
    height: 0.625rem;
    border-radius: 50%;
    flex-shrink: 0;
    display: inline-block;
    border: 2px solid var(--text-3);
    background: transparent;
  }
  [data-state="found"] .dot,
  .dot[data-state="found"] {
    border-color: var(--found);
    background: var(--found);
  }
  [data-state="action"] .dot,
  .dot[data-state="action"] {
    border-color: var(--action);
    border-style: dashed;
  }
  [data-state="error"] .dot,
  .dot[data-state="error"] {
    border-color: var(--error);
    background: var(--error);
  }
  [data-state="off"] .dot,
  .dot[data-state="off"] {
    border-color: var(--border-strong);
  }
  [data-state="loading"] .dot,
  .dot[data-state="loading"] {
    border-color: var(--text-3);
    border-top-color: transparent;
    animation: spin 0.8s linear infinite;
  }
  @keyframes spin { to { transform: rotate(360deg); } }

  .pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.1rem 0.5rem;
    border-radius: 999px;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    white-space: nowrap;
    color: var(--text-2);
    background: var(--surface-2);
  }
  .pill .dot { width: 0.5rem; height: 0.5rem; border-width: 1.5px; }
  .pill[data-state="found"] { color: var(--accent-strong); background: var(--found-bg); }
  .pill[data-state="action"] { color: var(--action); background: var(--action-bg); }
  .pill[data-state="error"] { color: var(--error); background: var(--error-bg); }
  .pill[data-state="none"],
  .pill[data-state="off"],
  .pill[data-state="loading"] { color: var(--text-3); }

  /* Dialog ---------------------------------------------------------------- */
  dialog.dialog {
    border: var(--hairline);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
    padding: 0;
    width: min(26rem, calc(100vw - 2rem));
    box-shadow: var(--shadow-pop);
  }
  dialog.dialog::backdrop {
    background: rgb(0 0 0 / 0.45);
  }
  .dialog__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    border-bottom: var(--hairline);
  }
  .dialog__body {
    padding: var(--space-4);
  }
  .dialog__body > * + * { margin-top: var(--space-4); }
  .dialog fieldset {
    border: 0;
    padding: 0;
    margin: 0;
  }
  .dialog legend {
    font-size: var(--text-sm);
    font-weight: 600;
    margin-bottom: var(--space-2);
  }

  /* Toasts ---------------------------------------------------------------- */
  #toast-container {
    position: fixed;
    bottom: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    pointer-events: none;
    width: max-content;
    max-width: calc(100vw - 2rem);
  }
  .toast {
    background: var(--text);
    color: var(--bg);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius);
    font-size: var(--text-sm);
    box-shadow: var(--shadow-pop);
    opacity: 0;
    transform: translateY(0.5rem);
    transition: opacity 0.2s, transform 0.2s;
  }
  .toast-visible {
    opacity: 1;
    transform: none;
  }

  /* Tips ------------------------------------------------------------------ */
  .hint-card {
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius);
    padding: var(--space-4) var(--space-5);
    display: grid;
    gap: var(--space-4);
    font-size: var(--text-sm);
    color: var(--text-2);
  }
  .hint-card__actions {
    display: flex;
    justify-content: flex-end;
  }
  .hint-card__content > * + * { margin-top: var(--space-2); }
  .hint-card h2,
  .hint-card h3,
  .hint-card h4 {
    color: var(--text);
    font-size: var(--text-md);
  }

  /* Intake (drop zone) -------------------------------------------------- */
  .intake {
    position: relative;
    border: 1.5px dashed var(--border-strong);
    border-radius: var(--radius);
    background: var(--surface);
    padding: var(--space-7) var(--space-5);
    text-align: center;
    transition: border-color 0.15s, background-color 0.15s;
  }
  .intake:hover { border-color: var(--text-3); }
  .intake.is-dragging {
    border-color: var(--accent);
    background: var(--accent-bg);
  }
  .intake__icon {
    font-size: 1.75rem;
    color: var(--text-3);
    margin: 0 auto var(--space-3);
  }
  .intake__title {
    font-family: var(--font-brand);
    font-weight: 400;
    font-size: var(--text-2xl);
  }
  .intake__lede {
    color: var(--text-2);
    margin-top: var(--space-2);
  }
  .intake__controls {
    max-width: 34rem;
    margin: var(--space-5) auto 0;
  }
  .intake__or {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--text-3);
    font-size: var(--text-xs);
    margin: var(--space-3) 0;
  }
  .intake__or::before,
  .intake__or::after {
    content: "";
    flex: 1;
    border-top: var(--hairline);
  }
  .intake__hint {
    margin-top: var(--space-4);
    font-size: var(--text-xs);
    color: var(--text-3);
  }

  .samples {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-4);
    font-size: var(--text-sm);
    color: var(--text-3);
  }
  .samples form { display: contents; }

  /* Full-page overlays --------------------------------------------------- */
  .overlay {
    position: fixed;
    inset: 0;
    z-index: 900;
    display: grid;
    place-items: center;
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: blur(2px);
  }
  .overlay__box {
    text-align: center;
    display: grid;
    justify-items: center;
    gap: var(--space-3);
    padding: var(--space-6);
  }
  .overlay__drop {
    width: min(32rem, 80vw);
    border: 2px dashed var(--accent);
    border-radius: var(--radius);
    padding: var(--space-7) var(--space-5);
    font-size: var(--text-lg);
    color: var(--accent-strong);
    background: var(--surface);
  }
  .overlay__thumb {
    width: 9rem;
    height: 9rem;
    object-fit: cover;
    border-radius: var(--radius);
    border: var(--hairline);
    background: var(--surface-2);
  }
  .overlay__title { font-size: var(--text-lg); font-weight: 600; }
  .overlay__steps {
    list-style: none;
    padding: 0;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--text-3);
    text-align: left;
    min-height: 5.5em;
  }
  .overlay__steps li { margin: 0; }
  .overlay__steps li.is-active { color: var(--text); }
  .overlay__steps li.is-active::before { content: "› "; color: var(--accent); }
  .overlay__steps li:not(.is-active)::before { content: "  "; white-space: pre; }
  .progress {
    width: 12rem;
    height: 3px;
    border-radius: 3px;
    background: var(--border);
    overflow: hidden;
  }
  .progress::after {
    content: "";
    display: block;
    height: 100%;
    width: 40%;
    background: var(--accent);
    animation: indeterminate 1.1s ease-in-out infinite;
  }
  @keyframes indeterminate {
    from { transform: translateX(-100%); }
    to { transform: translateX(250%); }
  }

  /* Breadcrumb-ish back link ------------------------------------------- */
  .backlink {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-sm);
    color: var(--text-2);
    text-decoration: none;
  }
  .backlink:hover { color: var(--text); }

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

  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
      animation-duration: 0.001ms !important;
      transition-duration: 0.001ms !important;
    }
  }
}

/* -------------------------------------------------------------------------- */
@layer utilities {
  /* Technical-detail visibility, driven by <html data-tech-mode>. */
  :root:not([data-tech-mode="on"]) .tech-only { display: none !important; }
  :root[data-tech-mode="on"] .friendly-only { display: none !important; }
}