/* ============================================================
   Clinical Trials Store — design tokens
   Palette: paper white / ink navy / slate-blue / compliance green / rev amber
   Type: IBM Plex Sans (prose) + IBM Plex Mono (document metadata)
   ============================================================ */

:root {
  --paper: #F7F7F4;
  --paper-raised: #FFFFFF;
  --ink: #1B2438;
  --slate: #5B6B82;
  --slate-light: #8A96A8;
  --hairline: #DCDDD6;
  --approved: #2B6E4F;
  --approved-bg: #E7F1EC;
  --rev-amber: #B4831F;
  --rev-amber-bg: #F5EDDC;
  --focus-ring: #2B4C7E;

  --font-display: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --radius: 3px;
  --max-width: 1120px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-display);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; }

button { font-family: inherit; cursor: pointer; }

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--hairline);
  background: var(--paper-raised);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
}

.brand-mark {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rev-amber);
  border: 1px solid var(--rev-amber);
  border-radius: var(--radius);
  padding: 2px 6px;
}

.brand-name {
  font-weight: 600;
  font-size: 18px;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
}

.site-nav a {
  text-decoration: none;
  color: var(--slate);
  font-weight: 500;
}

.site-nav a:hover, .site-nav a.active { color: var(--ink); }

/* ---------- Hero ---------- */

.hero {
  padding: 88px 0 64px;
  border-bottom: 1px solid var(--hairline);
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
}

.hero-eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--approved);
  display: inline-block;
}

.hero h1 {
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  max-width: 15ch;
}

.hero p.lede {
  font-size: 18px;
  color: var(--slate);
  max-width: 56ch;
  margin: 0 0 32px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  text-decoration: none;
  transition: transform 0.12s ease, background 0.12s ease;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover { background: #10192b; }

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--hairline);
}
.btn-secondary:hover { border-color: var(--slate); }

.hero-trust {
  margin-top: 40px;
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--slate);
  font-family: var(--font-mono);
}

.hero-trust span { display: flex; align-items: center; gap: 6px; }

/* ---------- Catalog ---------- */

.catalog {
  padding: 56px 0 80px;
}

.catalog-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 28px;
  gap: 16px;
  flex-wrap: wrap;
}

.catalog-head h2 {
  font-size: 26px;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}

.catalog-head p {
  color: var(--slate);
  margin: 0;
  font-size: 15px;
}

.filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--paper-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 7px 14px;
  font-size: 13px;
  color: var(--slate);
  font-weight: 500;
}

.filter-btn:hover { border-color: var(--slate); }

.filter-btn.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(258px, 1fr));
  gap: 18px;
}

.card {
  background: var(--paper-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  border-color: var(--slate-light);
  box-shadow: 0 4px 16px rgba(27, 36, 56, 0.06);
}

.card-header {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--slate);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: #FBFBF9;
  border-bottom: 1px solid var(--hairline);
  letter-spacing: 0.02em;
}

.card-header .doc-id { color: var(--ink); font-weight: 600; }

.status-pill {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 2px;
  background: var(--approved-bg);
  color: var(--approved);
}

.card-body {
  padding: 16px 14px 14px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-tags {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}

.tag {
  font-size: 11px;
  font-family: var(--font-mono);
  padding: 2px 7px;
  border-radius: 2px;
  border: 1px solid var(--hairline);
  color: var(--slate);
}

.card h3 {
  font-size: 16px;
  margin: 0 0 8px;
  line-height: 1.3;
}

.card p.desc {
  font-size: 13.5px;
  color: var(--slate);
  margin: 0 0 14px;
  flex: 1;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--hairline);
}

.price {
  font-weight: 700;
  font-size: 17px;
}

.rev-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--rev-amber);
  background: var(--rev-amber-bg);
  padding: 2px 6px;
  border-radius: 2px;
}

.btn-small {
  padding: 8px 14px;
  font-size: 13px;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  border: none;
  font-weight: 600;
}

.btn-small:hover { background: #10192b; }

/* ---------- Modal / detail view ---------- */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(20, 26, 41, 0.55);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 24px;
}

.modal-backdrop.open { display: flex; }

.modal {
  background: var(--paper-raised);
  max-width: 640px;
  width: 100%;
  max-height: 88vh;
  overflow-y: auto;
  border-radius: 4px;
  position: relative;
  border: 1px solid var(--hairline);
}

.modal-stamp {
  position: absolute;
  top: 28px;
  right: 24px;
  border: 2px solid var(--approved);
  color: var(--approved);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 10px;
  border-radius: 3px;
  transform: rotate(-6deg);
  opacity: 0.85;
  pointer-events: none;
}

.modal-close {
  position: absolute;
  top: 16px;
  left: 16px;
  background: transparent;
  border: none;
  font-size: 20px;
  color: var(--slate);
  line-height: 1;
  padding: 6px;
}

.modal-close:hover { color: var(--ink); }

.modal-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate);
  background: #FBFBF9;
  border-bottom: 1px solid var(--hairline);
  padding: 48px 28px 16px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 24px;
}

.modal-meta div span {
  display: block;
  color: var(--slate-light);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 2px;
}

.modal-content { padding: 24px 28px 28px; }

.modal-content h2 {
  margin: 0 0 12px;
  font-size: 22px;
}

.modal-content p.desc { color: var(--slate); font-size: 15px; margin-bottom: 20px; }

.modal-content ul {
  margin: 0 0 24px;
  padding-left: 18px;
  font-size: 14px;
  color: var(--ink);
}

.modal-content li { margin-bottom: 6px; }

.modal-buy {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--hairline);
  padding-top: 20px;
}

.modal-buy .price { font-size: 24px; }

/* ---------- Checkout status states ---------- */

.checkout-status {
  font-size: 13px;
  color: var(--slate);
  margin-top: 10px;
  min-height: 18px;
}

.checkout-status.error { color: #B4443A; }
.checkout-status.success { color: var(--approved); }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--hairline);
  padding: 32px 0;
  font-size: 13px;
  color: var(--slate-light);
  font-family: var(--font-mono);
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

@media (max-width: 640px) {
  .hero { padding: 56px 0 44px; }
  .site-nav { gap: 16px; }
  .modal-meta { grid-template-columns: 1fr; padding-top: 44px; }
}