/* Scite palette — swap these to rebrand. */
:root {
  --color-bg: #faf8f5;
  --color-surface: #ffffff;
  --color-ink: #1a1a1a;
  --color-ink-muted: #5a5a5a;
  --color-border: #e8e4de;
  --color-primary: #0040ff;
  --color-primary-ink: #ffffff;
  --color-accent-html: #0040ff;
  --color-accent-pdf: #c25a00;
  --color-accent-external: #00a0b0;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 2px rgba(20, 20, 20, 0.04), 0 0 0 1px var(--color-border);
  --shadow-md: 0 6px 20px rgba(20, 20, 20, 0.08), 0 0 0 1px var(--color-border);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto,
    "Helvetica Neue", Arial, sans-serif;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  width: 100%;
}

/* ── Header ─────────────────────────────────────────────── */

.site-header {
  padding: var(--space-12) 0 var(--space-8);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary);
  display: inline-block;
}

.brand-name {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.tagline {
  margin: var(--space-3) 0 0;
  color: var(--color-ink-muted);
  font-size: 1.05rem;
  max-width: 60ch;
}

/* ── Hero ───────────────────────────────────────────────── */

.hero {
  margin-top: var(--space-6);
  max-width: 72ch;
}

.hero-eyebrow {
  margin: 0;
  color: var(--color-primary);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-eyebrow a,
.how-step-text a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: opacity 120ms ease;
}

.hero-eyebrow a:hover,
.hero-eyebrow a:focus-visible,
.how-step-text a:hover,
.how-step-text a:focus-visible {
  opacity: 0.7;
}

.how-step-text a {
  color: var(--color-primary);
  border-bottom-color: color-mix(in srgb, var(--color-primary) 35%, transparent);
}

.hero-headline {
  margin: var(--space-3) 0 0;
  font-size: clamp(1.6rem, 2.4vw + 1rem, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--color-ink);
}

.hero-subhead {
  margin: var(--space-4) 0 0;
  color: var(--color-ink-muted);
  font-size: 1.05rem;
  line-height: 1.55;
  max-width: 64ch;
}

.how-it-works {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-6);
}

.how-it-works li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.95rem;
  color: var(--color-ink);
}

.how-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: 0.82rem;
  font-weight: 600;
  flex-shrink: 0;
}

.legend {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: var(--space-4) 0 0;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.legend-coming {
  background: var(--color-bg);
  color: var(--color-ink-muted);
  border: 1px dashed var(--color-border);
}

/* ── Grid ───────────────────────────────────────────────── */

main.container {
  flex: 1;
  padding-top: var(--space-8);
  padding-bottom: var(--space-12);
}

.grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
}

/* ── Tile ───────────────────────────────────────────────── */

.tile {
  position: relative;
  display: flex;
}

.tile-link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-5) calc(var(--space-5) + 2.75rem);
  width: 100%;
  min-height: 160px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: inherit;
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.tile-link:hover,
.tile-link:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.tile-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.tile-title {
  margin: 0;
  padding-right: 4rem; /* leave room for the badge */
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.005em;
}

.tile-description {
  margin: 0;
  color: var(--color-ink-muted);
  font-size: 0.95rem;
}

.tile-badge {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-primary-ink);
  background: var(--color-accent-html);
}

.tile-badge[data-type="pdf"] {
  background: var(--color-accent-pdf);
}

.tile-badge[data-type="external"] {
  background: var(--color-accent-external);
}

/* ── Dataset tags ───────────────────────────────────────── */

.tile-tags {
  list-style: none;
  margin: auto 0 0;
  padding: var(--space-3) 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tile-tag {
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  background: var(--color-bg);
  color: var(--color-ink-muted);
  border: 1px solid var(--color-border);
}

.tile-tag[data-dataset="papers"] {
  background: #eef1ff;
  color: #1a2f9e;
  border-color: #d4dbff;
}

.tile-tag[data-dataset="patents"] {
  background: #fdf1e6;
  color: #8a4000;
  border-color: #f3dcc2;
}

.tile-tag[data-dataset="grants"] {
  background: #eaf6ee;
  color: #1f5d34;
  border-color: #cfe8d6;
}

.tile-tag[data-dataset="clinical-trials"] {
  background: #eaf4f6;
  color: #0a5d68;
  border-color: #c8e3e7;
}

/* ── Tile footer actions (PDF + View prompt) ────────────── */

.view-prompt-btn,
.pdf-download {
  position: absolute;
  bottom: var(--space-4);
  z-index: 2;
  display: inline-flex;
  align-items: center;
  box-sizing: border-box;
  height: 26px;
  padding: 0 10px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-primary);
  font-size: 0.78rem;
  font-weight: 600;
  font-family: inherit;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  transition: background 120ms ease, border-color 120ms ease;
}

.view-prompt-btn {
  right: var(--space-4);
}

.pdf-download {
  left: var(--space-4);
}

.pdf-download:hover,
.pdf-download:focus-visible {
  background: var(--color-bg);
  border-color: var(--color-primary);
}

.pdf-download:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.view-prompt-btn:hover,
.view-prompt-btn:focus-visible {
  background: var(--color-bg);
  border-color: var(--color-primary);
}

.view-prompt-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ── Prompt modal ───────────────────────────────────────── */

dialog#prompt-modal {
  padding: 0;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  color: var(--color-ink);
  max-width: 720px;
  width: calc(100% - var(--space-8));
  max-height: calc(100vh - var(--space-8));
  box-shadow: 0 20px 60px rgba(20, 20, 20, 0.18);
}

dialog#prompt-modal::backdrop {
  background: rgba(20, 20, 20, 0.55);
}

.modal-body {
  position: relative;
  padding: var(--space-6);
  max-height: calc(100vh - var(--space-8));
  overflow-y: auto;
}

.modal-close {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--color-ink-muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  border-radius: var(--radius-sm);
  font-family: inherit;
}

.modal-close:hover,
.modal-close:focus-visible {
  background: var(--color-bg);
  color: var(--color-ink);
}

.modal-close:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.modal-title {
  margin: 0 var(--space-8) 0 0;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.modal-tags {
  list-style: none;
  margin: var(--space-3) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.modal-prompts {
  margin-top: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.modal-empty {
  margin: 0;
  padding: var(--space-5);
  background: var(--color-bg);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-ink-muted);
  text-align: center;
}

.prompt-block {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
}

.prompt-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.prompt-block-label {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-ink-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.copy-btn {
  padding: 4px 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease;
}

.copy-btn:hover,
.copy-btn:focus-visible {
  background: var(--color-bg);
  border-color: var(--color-primary);
}

.copy-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.prompt-text {
  margin: 0;
  padding: var(--space-4);
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--color-ink);
  max-height: 50vh;
  overflow-y: auto;
}

.prompt-text:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

.modal-actions {
  margin-top: var(--space-5);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.modal-open-artifact,
.modal-download-pdf {
  display: inline-block;
  padding: var(--space-3) var(--space-5);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: background 120ms ease, opacity 120ms ease;
}

.modal-open-artifact {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border: 1px solid var(--color-primary);
}

.modal-open-artifact:hover,
.modal-open-artifact:focus-visible {
  opacity: 0.88;
}

.modal-download-pdf {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.modal-download-pdf:hover,
.modal-download-pdf:focus-visible {
  background: var(--color-bg);
}

.modal-open-artifact:focus-visible,
.modal-download-pdf:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ── Empty / error state ────────────────────────────────── */

.empty-state {
  grid-column: 1 / -1;
  padding: var(--space-12) var(--space-6);
  text-align: center;
  color: var(--color-ink-muted);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.empty-state code {
  background: var(--color-bg);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

/* ── Footer ─────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) 0;
  background: var(--color-surface);
  color: var(--color-ink-muted);
  font-size: 0.9rem;
}

.site-footer a {
  color: var(--color-primary);
  text-decoration: none;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  text-decoration: underline;
}

@media (prefers-reduced-motion: reduce) {
  .tile-link {
    transition: none;
  }
  .tile-link:hover,
  .tile-link:focus-visible {
    transform: none;
  }
}