/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Design tokens ───────────────────────────────────────── */
:root {
  --bg:           #f5f4f0;
  --bg-card:      #ffffff;
  --bg-subtle:    #f0ede8;
  --border:       #e4dfd8;
  --border-soft:  #ede9e3;
  --text:         #1c1917;
  --text-muted:   #78716c;
  --text-light:   #a8a29e;
  --accent:       #3d6b4f;       /* forest green */
  --accent-light: #eef5f1;
  --accent-dark:  #2d5239;
  --amber:        #92400e;
  --amber-bg:     #fffbeb;
  --high:         #166534;
  --high-bg:      #dcfce7;
  --high-border:  #bbf7d0;
  --mod:          #92400e;
  --mod-bg:       #fef3c7;
  --mod-border:   #fde68a;
  --low:          #991b1b;
  --low-bg:       #fee2e2;
  --low-border:   #fecaca;
  --radius-sm:    6px;
  --radius:       10px;
  --radius-lg:    16px;
  --shadow-sm:    0 1px 2px rgba(0,0,0,.05);
  --shadow:       0 1px 4px rgba(0,0,0,.07), 0 2px 8px rgba(0,0,0,.04);
  --shadow-md:    0 4px 16px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.04);
  --font:         'Inter', system-ui, -apple-system, sans-serif;
}

/* ── Base ────────────────────────────────────────────────── */
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1,h2,h3 { line-height: 1.3; letter-spacing: -.02em; }

/* ── Layout ──────────────────────────────────────────────── */
.container { max-width: 1120px; margin: 0 auto; padding: 0 1.5rem; }
.page      { padding: 2.5rem 0 5rem; }

/* ── Navigation ──────────────────────────────────────────── */
.site-nav {
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
  position: sticky; top: 0; z-index: 100;
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1120px; margin: 0 auto; padding: .85rem 1.5rem;
}
.nav-brand {
  display: flex; align-items: center; gap: .6rem;
  font-weight: 700; font-size: .95rem; color: var(--text);
  letter-spacing: -.01em;
}
.nav-brand-icon {
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--accent);
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: .75rem; font-weight: 800;
}
.nav-links { display: flex; gap: .25rem; }
.nav-links a {
  color: var(--text-muted); font-size: .875rem; font-weight: 500;
  padding: .4rem .75rem; border-radius: var(--radius-sm);
  transition: all .15s;
}
.nav-links a:hover  { color: var(--text); background: var(--bg-subtle); text-decoration: none; }
.nav-links a.active { color: var(--accent); background: var(--accent-light); }

/* ── Page header ─────────────────────────────────────────── */
.page-header { margin-bottom: 2rem; }
.page-header h1 { font-size: 1.75rem; font-weight: 700; margin-bottom: .35rem; }
.page-header p  { color: var(--text-muted); font-size: .9rem; max-width: 560px; }

/* ── Stat cards ──────────────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: .75rem;
  margin-bottom: 2rem;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow-sm);
}
.stat-card .num {
  font-size: 1.75rem; font-weight: 800;
  color: var(--accent); letter-spacing: -.03em; line-height: 1;
}
.stat-card .lbl {
  font-size: .75rem; color: var(--text-muted);
  margin-top: .3rem; font-weight: 500;
  text-transform: uppercase; letter-spacing: .04em;
}
.stat-card.high .num { color: var(--high); }
.stat-card.mod  .num { color: var(--mod);  }
.stat-card.low  .num { color: var(--low);  }

/* ── Search bar ──────────────────────────────────────────── */
.search-row {
  display: flex; gap: .625rem; flex-wrap: wrap;
  margin-bottom: 1rem;
}
.search-input-wrap {
  position: relative; flex: 1 1 260px;
}
.search-input-wrap svg {
  position: absolute; left: .75rem; top: 50%;
  transform: translateY(-50%); color: var(--text-light);
  pointer-events: none;
}
.search-input-wrap input {
  width: 100%; padding: .6rem .85rem .6rem 2.25rem;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-size: .875rem; background: var(--bg-card); color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.search-input-wrap input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(61,107,79,.12);
}
.filter-select {
  padding: .6rem .85rem; border: 1px solid var(--border);
  border-radius: var(--radius-sm); font-size: .875rem;
  background: var(--bg-card); color: var(--text);
  cursor: pointer; transition: border-color .15s;
}
.filter-select:focus { outline: none; border-color: var(--accent); }

.result-count {
  font-size: .82rem; color: var(--text-muted);
  margin-bottom: 1.25rem; font-weight: 500;
}

/* ── Study grid ──────────────────────────────────────────── */
.study-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: .875rem;
}
.study-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 1.1rem 1.25rem;
  display: flex; flex-direction: column; gap: .5rem;
  transition: box-shadow .2s, border-color .2s, transform .2s;
  cursor: pointer;
}
.study-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
  transform: translateY(-1px);
  text-decoration: none;
}
.study-card-header {
  display: flex; justify-content: space-between;
  align-items: flex-start; gap: .5rem;
}
.study-card-title { font-weight: 650; color: var(--text); font-size: .925rem; }
.study-card-year  { font-size: .8rem; color: var(--text-light); white-space: nowrap; }
.study-card-design { font-size: .78rem; color: var(--text-muted); }
.study-card-condition {
  font-size: .82rem; color: var(--text-muted);
  display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
  line-height: 1.45;
}
.study-card-footer {
  display: flex; align-items: center; gap: .5rem;
  margin-top: .15rem; flex-wrap: wrap;
}
.qi-pill {
  font-size: .75rem; color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .1rem .5rem; font-weight: 500;
}

/* ── Badges ──────────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center;
  padding: .15rem .6rem; border-radius: 999px;
  font-size: .7rem; font-weight: 600;
  letter-spacing: .025em; white-space: nowrap; border-width: 1px; border-style: solid;
}
.badge-high     { background: var(--high-bg);   color: var(--high);   border-color: var(--high-border); }
.badge-moderate { background: var(--mod-bg);    color: var(--mod);    border-color: var(--mod-border);  }
.badge-low      { background: var(--low-bg);    color: var(--low);    border-color: var(--low-border);  }
.badge-neutral  { background: #f5f5f5; color: #666; border-color: #e5e5e5; }
.badge-venue    { background: #fff7ed; color: #9a3412; border-color: #fed7aa; }

/* ── Study detail ────────────────────────────────────────── */
.breadcrumb { font-size: .82rem; color: var(--text-muted); margin-bottom: 1.5rem; }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }

.study-hero {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
}
.study-hero h1 { font-size: 1.5rem; margin-bottom: .6rem; }
.study-hero-meta { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }
.study-hero-meta .divider { color: var(--border); }

.qi-block { margin-top: 1.25rem; padding-top: 1.25rem; border-top: 1px solid var(--border-soft); }
.qi-label-row {
  display: flex; justify-content: space-between;
  align-items: baseline; margin-bottom: .5rem;
}
.qi-label { font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); font-weight: 600; }
.qi-value { font-size: 1.1rem; font-weight: 800; color: var(--text); }
.qi-track { background: var(--bg-subtle); border-radius: 99px; height: 6px; }
.qi-fill  { height: 6px; border-radius: 99px; background: var(--accent); transition: width .6s ease; }
.qi-scale {
  display: flex; justify-content: space-between;
  font-size: .68rem; color: var(--text-light);
  margin-top: .3rem;
}

.detail-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-items: start;
}
@media (max-width: 700px) { .detail-cols { grid-template-columns: 1fr; } }

.detail-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.detail-card-head {
  padding: .75rem 1.25rem;
  border-bottom: 1px solid var(--border-soft);
  font-size: .72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .07em;
  color: var(--text-muted); background: var(--bg-subtle);
}
.detail-card-body { padding: 1rem 1.25rem; }

.dl { display: flex; flex-direction: column; gap: 0; }
.dl-row {
  display: flex; gap: 1rem;
  padding: .5rem 0; border-bottom: 1px solid var(--border-soft);
  font-size: .875rem;
}
.dl-row:last-child { border-bottom: none; }
.dl-key   { color: var(--text-muted); min-width: 130px; flex-shrink: 0; font-size: .82rem; }
.dl-val   { color: var(--text); }

.prose { font-size: .875rem; line-height: 1.7; color: var(--text); white-space: pre-line; }

/* ── Quality scores grid ─────────────────────────────────── */
.scores-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(50px,1fr));
  gap: .375rem;
}
.score-cell {
  text-align: center; padding: .4rem .25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.score-cell .sc-label { font-size: .6rem; color: var(--text-muted); font-weight: 600; text-transform: uppercase; }
.score-cell .sc-val   { font-size: .9rem; font-weight: 800; margin-top: .1rem; }
.score-3 { background: var(--high-bg); border-color: var(--high-border); }
.score-3 .sc-val { color: var(--high); }
.score-2 { background: var(--mod-bg);  border-color: var(--mod-border); }
.score-2 .sc-val { color: var(--mod);  }
.score-1 { background: var(--low-bg);  border-color: var(--low-border); }
.score-1 .sc-val { color: var(--low);  }

/* ── Conditions page ─────────────────────────────────────── */
.domain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: .75rem;
  margin-top: 1rem;
}
.domain-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column; gap: .5rem;
  transition: box-shadow .2s, border-color .2s, transform .2s;
}
.domain-card:hover {
  box-shadow: var(--shadow-md); border-color: var(--accent);
  transform: translateY(-1px); text-decoration: none;
}
.domain-card-name  { font-weight: 650; color: var(--text); font-size: .925rem; }
.domain-card-stats { display: flex; gap: .75rem; align-items: center; }
.domain-card-count { font-size: .8rem; color: var(--text-muted); }
.domain-avg-qi {
  font-size: .75rem; color: var(--text-muted);
  background: var(--bg-subtle); border: 1px solid var(--border);
  border-radius: 999px; padding: .1rem .5rem;
}

/* ── Quality table ───────────────────────────────────────── */
.quality-table { width: 100%; border-collapse: collapse; font-size: .86rem; }
.quality-table thead tr { border-bottom: 2px solid var(--border); }
.quality-table th {
  padding: .65rem .875rem; text-align: left;
  font-size: .72rem; text-transform: uppercase;
  letter-spacing: .05em; color: var(--text-muted); font-weight: 600;
}
.quality-table tbody tr {
  border-bottom: 1px solid var(--border-soft);
  transition: background .1s;
}
.quality-table tbody tr:hover { background: var(--bg-subtle); }
.quality-table td { padding: .6rem .875rem; vertical-align: middle; }

/* ── PDF button ──────────────────────────────────────────── */
.btn-pdf {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .55rem 1.1rem;
  background: var(--accent); color: #fff;
  border-radius: var(--radius-sm); font-size: .875rem; font-weight: 600;
  transition: background .15s, transform .15s;
}
.btn-pdf:hover { background: var(--accent-dark); text-decoration: none; transform: translateY(-1px); color: #fff; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .stats-row { grid-template-columns: repeat(3, 1fr); }
  .study-grid { grid-template-columns: 1fr; }
  .domain-grid { grid-template-columns: 1fr; }
  .nav-links a { padding: .35rem .5rem; font-size: .82rem; }
}
@media (max-width: 480px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .stat-card:last-child { grid-column: span 2; }
}