/* Pep Research Academy — blue & white theme */
:root {
  --blue-900: #0a2a5e;
  --blue-800: #0d3a80;
  --blue-700: #1250a8;
  --blue-600: #1a63c9;
  --blue-500: #2f7ff0;
  --blue-100: #e3eefc;
  --blue-50:  #f3f8ff;
  --white:    #ffffff;
  --ink:      #12233d;
  --muted:    #5b6b82;
  --line:     #dbe5f2;
  --radius:   14px;
  --shadow:   0 6px 24px rgba(10, 42, 94, 0.08);
  --max:      1180px;
  --font:     "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --serif:    "Merriweather", Georgia, serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--blue-600); text-decoration: none; }
a:hover { color: var(--blue-800); }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* ---------- Top bar & header ---------- */
.topbar {
  background: var(--blue-900);
  color: #c9dbf7;
  font-size: 13px;
  text-align: center;
  padding: 7px 16px;
}
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 76px; gap: 20px;
}
.logo { display: flex; align-items: center; }
.logo img { height: 52px; width: auto; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a {
  color: var(--ink); font-weight: 500; font-size: 15px; position: relative; padding: 6px 0;
}
.nav a:hover, .nav a.active { color: var(--blue-600); }
.nav a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--blue-600); border-radius: 2px;
}
.header-actions { display: flex; align-items: center; gap: 12px; }
.search-btn {
  border: 1px solid var(--line); background: var(--white); border-radius: 50%;
  width: 40px; height: 40px; display: grid; place-items: center; cursor: pointer; color: var(--blue-800);
}
.search-btn:hover { background: var(--blue-50); }
.menu-toggle { display: none; border: 0; background: none; cursor: pointer; padding: 8px; color: var(--blue-900); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px; font-weight: 600; font-size: 15px;
  border: 2px solid transparent; cursor: pointer; transition: all .15s ease;
}
.btn-primary { background: var(--blue-600); color: var(--white); }
.btn-primary:hover { background: var(--blue-800); color: var(--white); }
.btn-white { background: var(--white); color: var(--blue-800); }
.btn-white:hover { background: var(--blue-100); color: var(--blue-900); }
.btn-outline { border-color: var(--white); color: var(--white); }
.btn-outline:hover { background: var(--white); color: var(--blue-800); }
.btn-ghost { border-color: var(--blue-600); color: var(--blue-600); background: var(--white); }
.btn-ghost:hover { background: var(--blue-600); color: var(--white); }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(circle at 85% 20%, rgba(47,127,240,.45), transparent 45%),
    linear-gradient(135deg, var(--blue-900) 0%, var(--blue-700) 100%);
  color: var(--white);
  padding: 90px 0 100px;
  overflow: hidden;
}
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 50px; align-items: center; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.25);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 18px;
}
.hero h1 { font-size: clamp(34px, 5vw, 54px); line-height: 1.12; margin: 0 0 18px; letter-spacing: -.02em; }
.hero p.lead { font-size: 18px; color: #d6e4fa; max-width: 560px; margin: 0 0 30px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-card {
  background: var(--white); color: var(--ink); border-radius: 20px; overflow: hidden;
  box-shadow: 0 30px 60px rgba(0,0,0,.25);
}
.hero-card .thumb { aspect-ratio: 16/9; }
.hero-card .body { padding: 22px 24px 26px; }
.hero-card h3 { margin: 8px 0 8px; font-size: 21px; line-height: 1.3; }
.hero-card h3 a { color: var(--ink); }
.hero-card h3 a:hover { color: var(--blue-600); }

/* ---------- Generic sections ---------- */
section { padding: 70px 0; }
.section-alt { background: var(--blue-50); }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 32px; }
.section-head h2 { font-size: 30px; margin: 0; letter-spacing: -.01em; color: var(--blue-900); }
.section-head p { margin: 6px 0 0; color: var(--muted); }

/* ---------- Thumbnails (generated gradient art) ---------- */
.thumb {
  position: relative; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--blue-700), var(--blue-500));
  color: rgba(255,255,255,.9);
}
.thumb svg { width: 34%; height: auto; opacity: .9; }
.thumb.t1 { background: linear-gradient(135deg, #0d3a80, #2f7ff0); }
.thumb.t2 { background: linear-gradient(135deg, #1250a8, #5aa2ff); }
.thumb.t3 { background: linear-gradient(135deg, #0a2a5e, #1a63c9); }
.thumb.t4 { background: linear-gradient(135deg, #1a63c9, #8cc0ff); }
.thumb.t5 { background: linear-gradient(135deg, #0d3a80, #3d8bff); }
.thumb.t6 { background: linear-gradient(135deg, #133f7d, #6fb0ff); }
.thumb img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

/* ---------- Post cards ---------- */
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform .15s ease, box-shadow .15s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.card .thumb { aspect-ratio: 16/10; }
.card .body { padding: 20px 22px 22px; display: flex; flex-direction: column; flex: 1; }
.card h3 { font-size: 19px; line-height: 1.35; margin: 10px 0 8px; }
.card h3 a { color: var(--ink); }
.card h3 a:hover { color: var(--blue-600); }
.card p { color: var(--muted); font-size: 15px; margin: 0 0 16px; flex: 1; }
.tag {
  display: inline-block; font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .06em;
  color: var(--blue-700); background: var(--blue-100); padding: 4px 10px; border-radius: 999px;
}
.meta { font-size: 13px; color: var(--muted); display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.meta .dot { width: 4px; height: 4px; border-radius: 50%; background: #a9b8cc; }

/* ---------- Categories ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.cat {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; display: block; color: var(--ink); transition: all .15s ease;
}
.cat:hover { border-color: var(--blue-500); box-shadow: var(--shadow); color: var(--ink); }
.cat .icon {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  background: var(--blue-100); color: var(--blue-700); margin-bottom: 14px;
}
.cat h4 { margin: 0 0 4px; font-size: 17px; }
.cat span { color: var(--muted); font-size: 14px; }

/* ---------- Newsletter ---------- */
.newsletter {
  background: linear-gradient(135deg, var(--blue-800), var(--blue-600));
  color: var(--white); border-radius: 22px; padding: 48px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 30px; align-items: center;
}
.newsletter h2 { margin: 0 0 8px; font-size: 28px; }
.newsletter p { margin: 0; color: #d6e4fa; }
.subscribe { display: flex; gap: 10px; background: var(--white); padding: 6px; border-radius: 999px; }
.subscribe input {
  flex: 1; min-width: 0; border: 0; outline: 0; padding: 10px 16px; font: inherit; font-size: 15px; border-radius: 999px;
}
.form-note { font-size: 13px; margin-top: 10px; color: #c9dbf7; min-height: 1em; }

/* ---------- Page header (inner pages) ---------- */
.page-hero {
  background: linear-gradient(135deg, var(--blue-900), var(--blue-700));
  color: var(--white); padding: 60px 0 56px;
}
.page-hero h1 { margin: 0 0 8px; font-size: clamp(30px, 4vw, 44px); letter-spacing: -.02em; }
.page-hero p { margin: 0; color: #d6e4fa; max-width: 640px; font-size: 17px; }
.breadcrumb { font-size: 14px; color: #a9c4ee; margin-bottom: 14px; }
.breadcrumb a { color: #d6e4fa; }

/* ---------- Blog listing filters ---------- */
.toolbar { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 30px; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--line); background: var(--white); color: var(--ink);
  padding: 8px 16px; border-radius: 999px; font: inherit; font-size: 14px; font-weight: 500; cursor: pointer;
}
.chip:hover { border-color: var(--blue-500); color: var(--blue-600); }
.chip.active { background: var(--blue-600); border-color: var(--blue-600); color: var(--white); }
.search-input {
  border: 1px solid var(--line); border-radius: 999px; padding: 10px 18px; font: inherit; font-size: 15px;
  min-width: 260px; outline: 0;
}
.search-input:focus { border-color: var(--blue-500); box-shadow: 0 0 0 3px var(--blue-100); }
.empty { text-align: center; color: var(--muted); padding: 40px 0; grid-column: 1 / -1; }

/* ---------- Article ---------- */
.article-wrap { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 50px; padding: 50px 0 70px; }
.article-cover { border-radius: 18px; overflow: hidden; aspect-ratio: 21/9; margin-bottom: 34px; }
.article-cover svg { width: 18%; }
.prose { font-family: var(--serif); font-size: 18px; line-height: 1.8; color: #1f2f47; }
.prose h2 { font-family: var(--font); color: var(--blue-900); font-size: 26px; margin: 40px 0 12px; letter-spacing: -.01em; }
.prose h3 { font-family: var(--font); color: var(--blue-800); font-size: 20px; margin: 30px 0 10px; }
.prose p { margin: 0 0 20px; }
.prose ul, .prose ol { padding-left: 24px; margin: 0 0 20px; }
.prose li { margin-bottom: 8px; }
.prose blockquote {
  margin: 26px 0; padding: 18px 24px; border-left: 4px solid var(--blue-600);
  background: var(--blue-50); border-radius: 0 12px 12px 0; color: var(--blue-900); font-style: italic;
}
.prose table { width: 100%; border-collapse: collapse; font-family: var(--font); font-size: 15px; margin: 0 0 24px; }
.prose th, .prose td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
.prose th { background: var(--blue-50); color: var(--blue-900); }
.disclaimer {
  font-family: var(--font); font-size: 14px; color: var(--muted);
  border: 1px solid var(--line); background: var(--blue-50); border-radius: 12px; padding: 16px 18px; margin-top: 36px;
}
.author-box {
  display: flex; gap: 16px; align-items: center; margin-top: 30px; padding-top: 24px; border-top: 1px solid var(--line);
}
.avatar {
  width: 54px; height: 54px; border-radius: 50%; flex: none;
  background: linear-gradient(135deg, var(--blue-700), var(--blue-500)); color: var(--white);
  display: grid; place-items: center; font-weight: 700;
}
.sidebar { display: flex; flex-direction: column; gap: 24px; }
.widget { border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; position: sticky; top: 100px; }
.widget + .widget { position: static; }
.widget h4 { margin: 0 0 14px; color: var(--blue-900); font-size: 16px; }
.toc { list-style: none; padding: 0; margin: 0; font-size: 14px; }
.toc li { margin-bottom: 8px; }
.toc a { color: var(--muted); }
.toc a:hover { color: var(--blue-600); }
.mini-post { display: flex; gap: 12px; align-items: center; margin-bottom: 14px; color: var(--ink); }
.mini-post:last-child { margin-bottom: 0; }
.mini-post .thumb { width: 64px; height: 64px; border-radius: 10px; flex: none; }
.mini-post .thumb svg { width: 50%; }
.mini-post strong { font-size: 14px; line-height: 1.35; display: block; }
.mini-post:hover strong { color: var(--blue-600); }

/* ---------- About / contact ---------- */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.feature-list { display: grid; gap: 18px; }
.feature { display: flex; gap: 16px; }
.feature .icon {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; flex: none;
  background: var(--blue-100); color: var(--blue-700);
}
.feature h4 { margin: 0 0 4px; }
.feature p { margin: 0; color: var(--muted); }
.form { display: grid; gap: 16px; }
.form label { font-weight: 600; font-size: 14px; display: grid; gap: 6px; }
.form input, .form textarea, .form select {
  font: inherit; font-size: 15px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; outline: 0; font-weight: 400;
}
.form input:focus, .form textarea:focus, .form select:focus { border-color: var(--blue-500); box-shadow: 0 0 0 3px var(--blue-100); }
.form textarea { min-height: 150px; resize: vertical; }
.panel { background: var(--white); border: 1px solid var(--line); border-radius: 18px; padding: 32px; box-shadow: var(--shadow); }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 30px; }
.stat { background: var(--blue-50); border-radius: 14px; padding: 20px; text-align: center; }
.stat strong { display: block; font-size: 28px; color: var(--blue-700); }
.stat span { font-size: 14px; color: var(--muted); }

/* ---------- Footer ---------- */
.site-footer { background: var(--blue-900); color: #b9cdee; padding: 60px 0 26px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; }
.footer-logo img { height: 50px; width: auto; margin-bottom: 16px; }
.site-footer h5 { color: var(--white); font-size: 15px; margin: 0 0 14px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 9px; font-size: 14px; }
.site-footer a { color: #b9cdee; }
.site-footer a:hover { color: var(--white); }
.site-footer p { font-size: 14px; margin: 0; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12); margin-top: 40px; padding-top: 22px;
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px;
}

/* ---------- Search overlay ---------- */
.search-overlay {
  position: fixed; inset: 0; background: rgba(10, 42, 94, .55); z-index: 100;
  display: none; align-items: flex-start; justify-content: center; padding: 100px 16px 16px;
}
.search-overlay.open { display: flex; }
.search-box { background: var(--white); border-radius: 18px; width: 100%; max-width: 640px; padding: 18px; box-shadow: 0 30px 60px rgba(0,0,0,.3); }
.search-box input { width: 100%; border: 0; outline: 0; font: inherit; font-size: 20px; padding: 10px 6px; border-bottom: 1px solid var(--line); }
.search-results { max-height: 50vh; overflow: auto; margin-top: 10px; }
.search-results a { display: block; padding: 12px 8px; border-radius: 10px; color: var(--ink); }
.search-results a:hover { background: var(--blue-50); }
.search-results small { color: var(--muted); display: block; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero-grid, .two-col, .newsletter { grid-template-columns: 1fr; }
  .post-grid { grid-template-columns: repeat(2, 1fr); }
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .article-wrap { grid-template-columns: 1fr; }
  .widget { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .menu-toggle { display: block; }
  .nav {
    position: absolute; top: 76px; left: 0; right: 0; background: var(--white);
    flex-direction: column; align-items: stretch; gap: 0; border-bottom: 1px solid var(--line);
    display: none; padding: 8px 20px 16px;
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav a.active::after { display: none; }
  .header-inner { position: relative; }
  .post-grid, .cat-grid, .stats { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 60px 0 70px; }
  .newsletter { padding: 30px 22px; }
  .subscribe { flex-direction: column; border-radius: 16px; }
  .search-input { min-width: 0; width: 100%; }
  .section-head { flex-direction: column; align-items: start; }
  section { padding: 50px 0; }
}
@media (max-width: 760px) { .logo img { height: 42px; } }

/* ---------- Article figures, facts & supplier ---------- */
.prose figure { margin: 30px 0; }
.prose figure img { width: 100%; height: auto; border-radius: 14px; }
.prose figure.fig-diagram img { max-width: 640px; margin: 0 auto; }
.prose figure.fig-structure img { max-width: 320px; margin: 0 auto; border: 1px solid var(--line); background: #fff; }
.prose figcaption { font-family: var(--font); font-size: 14px; color: var(--muted); text-align: center; margin-top: 10px; }
.prose table.facts th { width: 38%; }
.prose table.facts td { word-break: break-word; }
.prose .callout {
  font-family: var(--font); font-size: 16px; background: var(--blue-50); border: 1px solid var(--line);
  border-radius: 14px; padding: 18px 22px; margin: 0 0 24px;
}
.prose .callout strong { color: var(--blue-900); }
.product-callout {
  display: flex; align-items: center; gap: 16px; margin: -10px 0 30px; padding: 16px 20px;
  border: 1px solid var(--blue-100); background: var(--blue-50); border-radius: 14px; color: var(--ink);
}
.product-callout:hover { border-color: var(--blue-500); color: var(--ink); }
.product-callout strong { display: block; color: var(--blue-900); }
.product-callout small { color: var(--muted); }
.product-callout .pc-icon { width: 44px; height: 44px; border-radius: 12px; background: var(--blue-600); color: #fff; display: grid; place-items: center; flex: none; }
.product-callout .pc-cta { margin-left: auto; font-weight: 700; color: var(--blue-600); white-space: nowrap; font-size: 15px; }
.supplier-box {
  font-family: var(--font); margin-top: 40px; padding: 26px 28px; border-radius: 18px; color: #fff;
  background: linear-gradient(135deg, var(--blue-800), var(--blue-600));
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
}
.supplier-box h3 { margin: 0 0 6px; color: #fff; font-size: 20px; }
.supplier-box p { margin: 0; color: #d6e4fa; font-size: 15px; line-height: 1.6; max-width: 520px; }
.supplier-box strong { color: #fff; }
.supplier-box .btn-primary { background: #fff; color: var(--blue-800); }
.supplier-box .btn-primary:hover { background: var(--blue-100); }
@media (max-width: 760px) {
  .product-callout { flex-wrap: wrap; }
  .product-callout .pc-cta { margin-left: 60px; }
}

/* ---------- Form states ---------- */
.form .form-note { color: var(--blue-600); font-size: 15px; }
.form .form-note.ok { color: #1b7a43; }
.form .form-note.err { color: #c62828; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.form-note.ok { color: var(--green, #1b7a43); }
.form-note.err { color: #c62828; }
.newsletter .form-note.ok { color: #c9f2d9; }
.newsletter .form-note.err { color: #ffd2d2; }
button[disabled] { opacity: .6; cursor: default; }

/* ---------- Reconstitution calculator ---------- */
.calc-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 30px; align-items: start; }
.calc-form { display: grid; gap: 24px; }
.calc-field { display: grid; gap: 10px; font-weight: 600; font-size: 15px; color: var(--blue-900); }
.calc-field small { font-weight: 400; color: var(--muted); }
.calc-field select, .calc-input input {
  font: inherit; font-weight: 400; font-size: 16px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px;
  outline: 0; width: 100%; background: #fff; color: var(--ink);
}
.calc-field select:focus, .calc-input input:focus { border-color: var(--blue-500); box-shadow: 0 0 0 3px var(--blue-100); }
.calc-input { display: flex; align-items: center; gap: 10px; }
.calc-input > span { font-weight: 600; color: var(--muted); min-width: 28px; }
.calc-step {
  display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 50%;
  background: var(--blue-600); color: #fff; font-size: 13px; margin-right: 6px;
}
.calc-links { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 14px; margin-top: -14px; }
.calc-links:empty { display: none; }
.calc-form .chips .chip { padding: 7px 14px; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; flex: none; }
.seg button { border: 0; background: #fff; padding: 11px 14px; font: inherit; font-weight: 600; color: var(--muted); cursor: pointer; }
.seg button.active { background: var(--blue-600); color: #fff; }
.calc-results { display: grid; gap: 16px; position: sticky; top: 96px; }
.result-main { padding: 28px; text-align: center; background: linear-gradient(180deg, #fff, var(--blue-50)); }
.result-label { font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--blue-700); }
.result-big { font-size: 64px; font-weight: 800; color: var(--blue-900); line-height: 1.1; letter-spacing: -.02em; }
.result-big small { font-size: 22px; font-weight: 600; color: var(--muted); margin-left: 8px; letter-spacing: 0; }
.result-sub { color: var(--muted); margin-bottom: 14px; }
.syringe svg { width: 100%; height: auto; display: block; }
.result-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.stat-box { padding: 18px 14px; text-align: center; }
.stat-box strong { display: block; font-size: 20px; color: var(--blue-700); }
.stat-box span { font-size: 13px; color: var(--muted); }
.calc-warn { margin-top: 14px; text-align: left; background: #fff4e5; border: 1px solid #f5c98a; color: #7a4a00; border-radius: 12px; padding: 12px 16px; font-size: 14px; }
.calc-warn p { margin: 0; }
.calc-warn p + p { margin-top: 6px; }
.calc-blend { font-size: 14px; color: var(--muted); background: var(--blue-50); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; margin: 0; }
.calc-steps { padding-left: 22px; }
.calc-steps li { margin-bottom: 14px; }
.calc-steps small { color: var(--muted); font-family: ui-monospace, Menlo, monospace; }
.calc-notes { padding-left: 20px; margin: 0; }
.calc-notes li { margin-bottom: 10px; color: var(--ink); }
.hidden { display: none !important; }
@media (max-width: 980px) {
  .calc-grid { grid-template-columns: 1fr; }
  .calc-results { position: static; }
}
@media (max-width: 760px) {
  .result-grid { grid-template-columns: 1fr; }
  .result-big { font-size: 52px; }
}

/* ---------- Research Explorer ---------- */
.explorer { max-width: 980px; }
.ex-progress { margin-bottom: 34px; }
.ex-bar { height: 8px; background: var(--blue-100); border-radius: 999px; overflow: hidden; }
.ex-bar span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--blue-600), var(--blue-500)); border-radius: 999px; transition: width .3s ease; }
.ex-steps { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 10px; font-size: 13px; font-weight: 600; color: #a0b0c6; }
.ex-steps span { text-align: center; }
.ex-steps span.done { color: var(--blue-700); }
.ex-step h2 { font-size: clamp(24px, 3vw, 30px); color: var(--blue-900); margin: 0 0 6px; letter-spacing: -.01em; }
.ex-hint { color: var(--muted); margin: 0 0 24px; }
.ex-options { display: grid; gap: 14px; }
.ex-grid-4 { grid-template-columns: repeat(4, 1fr); }
.ex-grid-3 { grid-template-columns: repeat(3, 1fr); }
.ex-grid-2 { grid-template-columns: repeat(2, 1fr); }
.ex-option {
  font: inherit; text-align: left; background: #fff; border: 2px solid var(--line); border-radius: 16px; padding: 20px;
  cursor: pointer; display: flex; flex-direction: column; gap: 6px; color: var(--ink); position: relative; transition: all .15s ease;
}
.ex-option:hover { border-color: var(--blue-500); box-shadow: var(--shadow); }
.ex-option strong { font-size: 16px; color: var(--blue-900); }
.ex-option > span:last-child { font-size: 14px; color: var(--muted); line-height: 1.45; }
.ex-option.selected { border-color: var(--blue-600); background: var(--blue-50); box-shadow: 0 0 0 3px var(--blue-100); }
.ex-option.selected::after {
  content: "✓"; position: absolute; top: 12px; right: 12px; width: 24px; height: 24px; border-radius: 50%;
  background: var(--blue-600); color: #fff; display: grid; place-items: center; font-size: 13px; font-weight: 800;
}
.ex-icon { width: 42px; height: 42px; border-radius: 12px; background: var(--blue-100); color: var(--blue-700); display: grid; place-items: center; margin-bottom: 4px; }
.ex-nav { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 28px; }
.ex-email { max-width: 560px; display: grid; gap: 14px; padding: 28px; }
.ex-email label { display: grid; gap: 6px; font-weight: 600; font-size: 14px; }
.ex-email label small { font-weight: 400; color: var(--muted); }
.ex-email input[type=email] { font: inherit; font-size: 16px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; outline: 0; }
.ex-email input[type=email]:focus { border-color: var(--blue-500); box-shadow: 0 0 0 3px var(--blue-100); }
.ex-email .ex-check { display: flex; gap: 10px; align-items: flex-start; font-weight: 500; }
.ex-check input { width: 18px; height: 18px; margin-top: 2px; accent-color: var(--blue-600); flex: none; }
.ex-privacy { font-size: 13px; color: var(--muted); margin: 0; }
.ex-email .ex-nav { margin-top: 6px; }
.ex-results-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 14px; }
.ex-summary { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.tag-outline { background: #fff; border: 1px solid var(--line); color: var(--muted); }
.ex-legend { display: flex; gap: 18px; flex-wrap: wrap; font-size: 13px; color: var(--muted); margin: 6px 0 20px; }
.ex-legend span { display: inline-flex; align-items: center; gap: 6px; }
.ev { display: inline-block; width: 10px; height: 10px; border-radius: 50%; }
.ev-approved { background: #1b7a43; }
.ev-clinical { background: var(--blue-600); }
.ev-preclinical { background: #b08a2e; }
.ev-badge { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 999px; }
.ev-badge.ev-approved { background: #e8f6ee; color: #1b7a43; }
.ev-badge.ev-clinical { background: var(--blue-100); color: var(--blue-700); }
.ev-badge.ev-preclinical { background: #fbf3df; color: #7a5d12; }
.ev-badge .ev { width: 8px; height: 8px; }
.ex-results { display: grid; gap: 18px; margin-bottom: 26px; }
.ex-card { display: grid; grid-template-columns: 220px minmax(0, 1fr); background: #fff; border: 1px solid var(--line); border-radius: 18px; overflow: hidden; }
.ex-card.top { border-color: var(--blue-500); box-shadow: var(--shadow); }
.ex-thumb img { width: 100%; height: 100%; object-fit: cover; min-height: 180px; }
.ex-body { padding: 20px 24px; }
.ex-meta { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.ex-rank { font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; color: #fff; background: var(--blue-600); padding: 4px 10px; border-radius: 999px; }
.ex-body h3 { margin: 10px 0 6px; font-size: 22px; }
.ex-body h3 a { color: var(--blue-900); }
.ex-body p { margin: 0 0 12px; color: var(--muted); font-size: 15px; }
.ex-note { font-size: 14px; background: var(--blue-50); border-radius: 10px; padding: 10px 14px; margin-bottom: 12px; }
.ex-hits { font-size: 13px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-bottom: 14px; }
.ex-hits span { background: var(--blue-100); color: var(--blue-700); border-radius: 999px; padding: 2px 10px; font-weight: 600; }
.ex-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.ex-actions .btn { padding: 10px 18px; font-size: 14px; }
.explorer .empty { padding: 30px; text-align: center; }
.explorer-cta { background: var(--blue-50); border-bottom: 1px solid var(--line); }
.explorer-cta .container { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-top: 22px; padding-bottom: 22px; flex-wrap: wrap; }
.explorer-cta strong { color: var(--blue-900); }
@media (max-width: 980px) {
  .ex-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .ex-grid-3 { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .ex-grid-4, .ex-grid-2 { grid-template-columns: 1fr; }
  .ex-card { grid-template-columns: 1fr; }
  .ex-thumb img { min-height: 0; aspect-ratio: 16 / 7; }
  .ex-nav { flex-wrap: wrap; }
}