/* Dr. Aarushi Dewan — "The Case File" (Shreya WS1 build #1).
   Chalk paper, graphite ink, ultramarine accent, red-seal stamp.
   System stacks only — this site works offline. Layered cascade. */
@layer base, components;

@layer base {
  :root {
    color-scheme: light dark;
    --paper: #f3f1ea;
    --ink: #26231f;
    --ink-soft: color-mix(in srgb, var(--ink) 62%, transparent);
    --line: color-mix(in srgb, var(--ink) 18%, transparent);
    --ultra: #31519c;
    --seal: #a83a2e;
    --card: color-mix(in srgb, var(--paper) 92%, white 8%);
  }
  @media (prefers-color-scheme: dark) {
    :root {
      --paper: #1b1916;
      --ink: #e9e6de;
      --ultra: #8fa8dd;
      --seal: #d4695c;
    }
  }
  * { box-sizing: border-box; }
  body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font: 16px/1.65 system-ui, "Segoe UI", sans-serif;
  }
  h1, h2, h3 {
    font-family: Georgia, "Iowan Old Style", "Times New Roman", serif;
    font-weight: 600;
    line-height: 1.2;
    margin: 0 0 12px;
  }
  h2 { font-size: clamp(1.5rem, 3.4vw, 2rem); }
  a { color: var(--ultra); }
  a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
    outline: 2px solid var(--ultra);
    outline-offset: 2px;
  }
  section { scroll-margin-top: 90px; }
}

@layer components {
  .skip-link {
    position: absolute;
    inset-inline-start: -999px;
    &:focus { inset-inline-start: 12px; inset-block-start: 8px; background: var(--paper); padding: 6px 10px; }
  }

  /* ---- header: identity + index-tab ribbon ---- */
  .file-head {
    position: sticky;
    inset-block-start: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 16px;
    background: color-mix(in srgb, var(--paper) 88%, transparent);
    backdrop-filter: blur(6px);
    border-block-end: 1px solid var(--line);
  }
  .file-identity {
    margin: 0;
    display: grid;
    gap: 0;
    line-height: 1.25;
    min-width: 0;
  }
  .file-mark {
    font: 700 1.05rem Georgia, serif;
    letter-spacing: 0.04em;
    color: var(--seal);
  }
  .file-mark-dot { color: var(--ultra); }
  .file-name {
    display: block;
    font-weight: 650;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .file-cred { font-size: 0.72rem; text-decoration: none; color: var(--ink-soft); }
  .file-sub { display: none; font-size: 0.78rem; color: var(--ink-soft); }
  @media (min-width: 720px) { .file-sub { display: block; } }

  .tab-ribbon {
    margin-inline-start: auto;
    display: flex;
    gap: 2px;
    overflow-x: auto;
    scrollbar-width: none;
    &::-webkit-scrollbar { display: none; }
  }
  .tab {
    display: grid;
    justify-items: center;
    gap: 0;
    padding: 6px 9px;
    font-size: 0.78rem;
    text-decoration: none;
    color: var(--ink-soft);
    border: 1px solid transparent;
    border-block-start: 3px solid var(--line);
    white-space: nowrap;
    &:hover { color: var(--ink); }
    &[aria-current="true"] {
      color: var(--ink);
      border-block-start-color: var(--seal);
      background: color-mix(in srgb, var(--ultra) 8%, transparent);
    }
  }
  .tab-no {
    font: 600 0.62rem/1 ui-monospace, Menlo, monospace;
    color: var(--ultra);
    letter-spacing: 0.08em;
  }
  .tab-book { color: var(--seal); font-weight: 600; }

  .theme-toggle {
    border: 1px solid var(--line);
    background: transparent;
    color: var(--ink);
    border-radius: 8px;
    padding: 7px;
    cursor: pointer;
    & .ic-moon { display: none; }
  }
  [data-theme="dark"] .theme-toggle {
    & .ic-sun { display: none; }
    & .ic-moon { display: block; }
  }

  /* ---- records ---- */
  .file-main {
    max-width: 820px;
    margin: 0 auto;
    padding: 24px 18px 80px;
  }
  .record {
    padding: 34px 0 10px;
    border-block-start: 1px solid var(--line);
    &:first-of-type { border-block-start: 0; }
  }
  .record-no {
    font: 600 0.72rem/1 ui-monospace, Menlo, monospace;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--seal);
    margin: 0 0 14px;
  }
  .record-list { padding-inline-start: 18px; display: grid; gap: 10px; }

  .record-hero {
    padding-block: 46px 26px;
    text-align: center;
    & h1 { font-size: clamp(1.9rem, 5.4vw, 3rem); }
  }
  .hero-stamp { width: 104px; margin: 0 auto 16px; }
  .stamp-ring { fill: none; stroke: var(--seal); stroke-width: 2; }
  .stamp-ring.stamp-ring-inner { stroke-width: 1; opacity: 0.6; }
  .stamp-key { fill: none; stroke: var(--ultra); stroke-width: 3; stroke-linecap: round; }
  .hero-line { font-size: 1.12rem; margin: 0 0 10px; }
  .hero-note { color: var(--ink-soft); font-size: 0.92rem; }

  /* ---- lino-cut art ---- */
  .file-art {
    margin: 26px 0 0;
    & svg { width: min(320px, 80%); display: block; }
    & figcaption { font-size: 0.85rem; color: var(--ink-soft); font-style: italic; margin-block-start: 6px; }
  }
  .art-light { fill: color-mix(in srgb, var(--ultra) 14%, transparent); }
  .art-key { fill: none; stroke: var(--ink); stroke-width: 4; stroke-linecap: round; }

  /* ---- for whom ---- */
  .for-whom-list {
    margin: 0;
    display: grid;
    gap: 12px;
    & div {
      border-inline-start: 3px solid var(--ultra);
      padding: 4px 0 4px 14px;
    }
    & dt { font-weight: 650; }
    & dd { margin: 2px 0 0; color: var(--ink-soft); }
  }

  /* ---- rooms ---- */
  .rooms-grid {
    display: grid;
    gap: 12px;
    @media (min-width: 640px) { grid-template-columns: 1fr 1fr; }
  }
  .room-card {
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 16px;
    background: var(--card);
    & h3 { font-size: 1.1rem; color: var(--ultra); }
    & p { margin: 0 0 8px; }
  }
  .room-note { color: var(--ink-soft); font-size: 0.9rem; }

  /* ---- the hour ---- */
  .hour-fee { font-weight: 600; }
  .hour-note { font-size: 0.88rem; color: var(--ink-soft); }
  .sample-badge {
    font: 600 0.68rem/1 ui-monospace, monospace;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--seal);
    border: 1px solid var(--seal);
    border-radius: 4px;
    padding: 2px 6px;
    margin-inline-end: 6px;
  }

  /* ---- about ---- */
  .about-grid {
    display: grid;
    gap: 18px;
    @media (min-width: 640px) { grid-template-columns: 150px 1fr; }
  }
  .portrait-slot {
    display: grid;
    place-items: center;
    gap: 8px;
    align-content: center;
    border: 1px dashed var(--line);
    border-radius: 10px;
    min-height: 150px;
    padding: 12px;
  }
  .monogram {
    font: 700 2rem Georgia, serif;
    color: var(--ultra);
    letter-spacing: 0.06em;
  }
  .portrait-note { font-size: 0.72rem; color: var(--ink-soft); text-align: center; }
  .about-sources { font-size: 0.86rem; color: var(--ink-soft); }

  /* ---- register ---- */
  .register-form {
    display: grid;
    gap: 8px;
    max-width: 480px;
  }
  .reg-label {
    font-size: 0.85rem;
    font-weight: 600;
    margin-block-start: 8px;
  }
  .reg-optional { font-weight: 400; color: var(--ink-soft); }
  .reg-field {
    font: inherit;
    padding: 9px 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--card);
    color: inherit;
  }
  .reg-field.invalid { border-color: var(--seal); }
  .reg-error { min-height: 1.2em; font-size: 0.88rem; color: var(--seal); }
  .reg-submit {
    justify-self: start;
    font: inherit;
    font-weight: 650;
    padding: 11px 24px;
    border-radius: 999px;
    border: 0;
    background: var(--seal);
    color: var(--paper);
    cursor: pointer;
    &:hover { filter: brightness(1.06); }
  }
  .reg-fallback { font-size: 0.9rem; color: var(--ink-soft); }

  /* ---- footer ---- */
  .file-foot {
    border-block-start: 1px solid var(--line);
    padding: 22px 18px 40px;
    text-align: center;
  }
  .foot-rule { margin: 0 0 6px; font-size: 0.9rem; }
  .foot-note { margin: 0; font-size: 0.8rem; color: var(--ink-soft); max-width: 60ch; margin-inline: auto; }
}