/* Discovery Exchange — Scientific & Clean
   Palette: deep teal + indigo accents on white. Serif headings (Source Serif 4), Inter body.
*/
:root{
  --bg:#ffffff;
  --bg-soft:#f6f9fb;
  --bg-tint:#eef5f6;
  --ink:#0e2230;
  --ink-soft:#3b4f5c;
  --muted:#6b7d88;
  --line:#dfe7eb;
  --teal:#0c6e72;
  --teal-deep:#084f52;
  --teal-tint:#d6ecec;
  --indigo:#2b3a8c;
  --indigo-soft:#e6e9f7;
  --accent:#c89b3c;
  --danger:#b3261e;
  --ok:#1f7a4d;
  --radius:10px;
  --radius-lg:18px;
  --shadow-sm:0 1px 2px rgba(14,34,48,.06), 0 1px 1px rgba(14,34,48,.04);
  --shadow-md:0 6px 18px rgba(14,34,48,.08);
  --shadow-lg:0 18px 40px rgba(14,34,48,.10);
  --container:1180px;
  --serif:'Source Serif 4', Georgia, 'Times New Roman', serif;
  --sans:'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:var(--sans);color:var(--ink);background:var(--bg);
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;display:block}
a{color:var(--teal);text-decoration:none}
a:hover{color:var(--teal-deep);text-decoration:underline}
h1,h2,h3,h4{font-family:var(--serif);color:var(--ink);line-height:1.18;margin:0 0 .5em;font-weight:600;letter-spacing:-.01em}
h1{font-size:clamp(2.1rem, 3.6vw + 1rem, 3.6rem)}
h2{font-size:clamp(1.6rem, 1.8vw + 1rem, 2.4rem)}
h3{font-size:1.25rem}
h4{font-size:1rem;font-family:var(--sans);text-transform:uppercase;letter-spacing:.08em;color:var(--ink-soft)}
p{margin:0 0 1em}
.muted{color:var(--muted)}
.small{font-size:.875rem}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
ul{padding-left:1.1em;margin:0 0 1em}
hr{border:0;border-top:1px solid var(--line);margin:48px 0}

.skip-link{position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;padding:8px 12px;z-index:1000}
.skip-link:focus{left:8px;top:8px}

/* --- Header --- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:14px 24px;max-width:var(--container);margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-text{display:flex;flex-direction:column;line-height:1;font-family:var(--serif)}
.brand-text strong{font-weight:700;font-size:1.05rem}
.brand-text span{font-size:.78rem;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;font-family:var(--sans)}
.primary-nav{display:flex;align-items:center;gap:24px}
.primary-nav>ul{list-style:none;padding:0;margin:0;display:flex;gap:6px;flex-wrap:wrap}
.primary-nav a{color:var(--ink-soft);font-weight:500;padding:8px 10px;border-radius:6px;font-size:.94rem}
.primary-nav a:hover{color:var(--teal-deep);background:var(--bg-soft);text-decoration:none}
.primary-nav a[aria-current=page]{color:var(--teal-deep);background:var(--teal-tint)}
.nav-cta{display:flex;gap:10px;align-items:center}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:6px;color:var(--ink);cursor:pointer}

/* --- Buttons --- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 18px;border-radius:8px;font-weight:600;font-size:.95rem;border:1px solid transparent;cursor:pointer;transition:all .15s ease;font-family:var(--sans);line-height:1}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-deep);color:#fff}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--teal);color:var(--teal-deep)}
.btn-outline{background:#fff;color:var(--teal-deep);border-color:var(--teal)}
.btn-outline:hover{background:var(--teal-tint)}
.btn-lg{padding:14px 24px;font-size:1rem}

/* --- Hero --- */
.hero{position:relative;padding:80px 0 64px;background:
  radial-gradient(1200px 600px at 80% -10%, var(--teal-tint), transparent 60%),
  radial-gradient(1000px 500px at -10% 110%, var(--indigo-soft), transparent 60%),
  var(--bg)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;background:var(--teal-tint);color:var(--teal-deep);border-radius:999px;font-size:.8rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase;margin-bottom:18px}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--teal)}
.hero p.lead{font-size:1.18rem;color:var(--ink-soft);max-width:62ch}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
.hero-stats{display:flex;gap:32px;margin-top:36px;flex-wrap:wrap}
.hero-stats div b{display:block;font-family:var(--serif);font-size:1.6rem;color:var(--teal-deep)}
.hero-stats div span{color:var(--muted);font-size:.88rem}

/* --- Sections --- */
.section{padding:72px 0}
.section.alt{background:var(--bg-soft)}
.section.tinted{background:linear-gradient(180deg,var(--bg) 0,var(--bg-tint) 100%)}
.section-head{max-width:760px;margin:0 auto 48px;text-align:center}
.section-head .eyebrow{background:var(--indigo-soft);color:var(--indigo)}

/* --- Cards & grids --- */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow-sm);transition:transform .15s ease, box-shadow .15s ease}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}
.card .icon{width:44px;height:44px;border-radius:10px;background:var(--teal-tint);display:grid;place-items:center;color:var(--teal-deep);margin-bottom:16px}
.card h3{margin-bottom:8px}
.card p{color:var(--ink-soft);margin:0}
.card .icon svg{width:24px;height:24px}

/* numbered steps */
.steps{counter-reset:step;display:grid;gap:20px}
.step{display:grid;grid-template-columns:56px 1fr;gap:20px;padding:24px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg)}
.step::before{counter-increment:step;content:counter(step,decimal-leading-zero);font-family:var(--serif);font-size:1.5rem;color:var(--teal);font-weight:700;background:var(--teal-tint);width:56px;height:56px;border-radius:12px;display:grid;place-items:center}
.step h3{margin:4px 0 6px}

/* --- Two-column feature --- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split.reverse{direction:rtl}
.split.reverse>*{direction:ltr}

/* --- Pricing --- */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.price{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:32px;display:flex;flex-direction:column}
.price.featured{border-color:var(--teal);box-shadow:var(--shadow-md);position:relative}
.price.featured::after{content:"Most popular";position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--teal);color:#fff;font-size:.75rem;font-weight:600;padding:4px 12px;border-radius:999px;letter-spacing:.06em;text-transform:uppercase}
.price .amount{font-family:var(--serif);font-size:2.4rem;color:var(--ink);margin:8px 0}
.price ul{list-style:none;padding:0;margin:16px 0 24px;flex:1}
.price li{padding:8px 0;border-bottom:1px dashed var(--line);color:var(--ink-soft);display:flex;gap:8px;align-items:flex-start}
.price li::before{content:"";width:18px;height:18px;border-radius:50%;background:var(--teal-tint) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23084f52' stroke-width='3'><path d='M5 12l5 5L20 7'/></svg>") center/12px no-repeat;flex:none;margin-top:3px}

/* --- FAQ --- */
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 22px;margin-bottom:12px}
.faq summary{cursor:pointer;font-weight:600;font-family:var(--serif);font-size:1.08rem;list-style:none;display:flex;justify-content:space-between;align-items:center;color:var(--ink)}
.faq summary::after{content:"+";font-size:1.4rem;color:var(--teal);transition:transform .2s}
.faq details[open] summary::after{content:"−"}
.faq details>p,.faq details>div{margin-top:10px;color:var(--ink-soft)}

/* --- Forms --- */
.form{display:grid;gap:16px;max-width:620px}
.form label{display:block;font-weight:600;font-size:.9rem;color:var(--ink);margin-bottom:6px}
.form input,.form textarea,.form select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:8px;font:inherit;color:var(--ink);background:#fff;transition:border .15s}
.form input:focus,.form textarea:focus,.form select:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 3px var(--teal-tint)}
.form textarea{min-height:140px;resize:vertical}
.form .row-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form .help{font-size:.82rem;color:var(--muted);margin-top:4px}
.form-message{padding:14px 16px;border-radius:8px;margin-bottom:18px;font-weight:500}
.form-message.ok{background:#e7f4ec;color:var(--ok);border:1px solid #c5e3d2}
.form-message.err{background:#fcebe9;color:var(--danger);border:1px solid #f3c8c4}

/* --- CTA banner --- */
.cta-banner{background:linear-gradient(135deg,var(--teal-deep),var(--indigo));color:#fff;border-radius:var(--radius-lg);padding:56px;text-align:center;margin:32px 0}
.cta-banner h2{color:#fff}
.cta-banner p{color:rgba(255,255,255,.85);max-width:60ch;margin:0 auto 24px}
.cta-banner .btn-primary{background:#fff;color:var(--teal-deep)}
.cta-banner .btn-primary:hover{background:#f0fafa}
.cta-banner .btn-ghost{color:#fff;border-color:rgba(255,255,255,.4)}

/* --- Footer --- */
.site-footer{background:var(--ink);color:#cdd8df;padding:64px 0 32px;margin-top:80px}
.site-footer h4{color:#fff;margin-bottom:14px;font-family:var(--sans);font-size:.85rem;text-transform:uppercase;letter-spacing:.1em}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin:6px 0}
.site-footer a{color:#cdd8df}
.site-footer a:hover{color:#fff}
.site-footer .brand-text strong,.site-footer .brand-text span{color:#fff}
.site-footer .brand-text span{color:#9bb0bd}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr 1fr;gap:40px}
.footer-brand .muted{color:#9bb0bd}
.footer-brand a{color:#cdd8df;text-decoration:underline}

/* --- Pills / chips --- */
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 16px}
.chip{padding:5px 12px;background:var(--bg-soft);border:1px solid var(--line);border-radius:999px;font-size:.82rem;color:var(--ink-soft)}

/* --- Tables --- */
table.matrix{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden}
table.matrix th,table.matrix td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line)}
table.matrix th{background:var(--bg-soft);font-family:var(--sans);font-size:.85rem;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-soft)}
table.matrix tr:last-child td{border-bottom:0}

/* --- Doc pages (terms/privacy) --- */
.doc{max-width:780px;margin:0 auto}
.doc h2{margin-top:2em}
.doc h3{margin-top:1.5em;font-family:var(--sans);text-transform:none;letter-spacing:0;font-weight:700;font-size:1.1rem;color:var(--ink)}
.doc ol li, .doc ul li{margin:.4em 0;color:var(--ink-soft)}
.toc{background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:20px 24px;margin:24px 0 32px}
.toc h4{margin-top:0}

/* --- Page header band --- */
.page-head{padding:64px 0 32px;background:linear-gradient(180deg,var(--bg-tint),var(--bg))}
.page-head .eyebrow{background:var(--indigo-soft);color:var(--indigo)}
.page-head p.lead{font-size:1.15rem;color:var(--ink-soft);max-width:64ch}

/* --- Auth (login/signup UI only) --- */
.auth-wrap{display:grid;place-items:center;padding:64px 0}
.auth-card{width:100%;max-width:440px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:36px;box-shadow:var(--shadow-md)}
.auth-card h1{font-size:1.6rem;margin-bottom:6px}
.auth-card .muted{margin-bottom:24px}
.auth-meta{text-align:center;margin-top:18px;color:var(--muted);font-size:.9rem}

/* --- Responsive --- */
@media (max-width: 960px){
  .hero{padding:56px 0 40px}
  .hero-grid,.split,.grid-2,.grid-3,.grid-4,.price-grid,.footer-grid{grid-template-columns:1fr}
  .footer-grid{gap:32px}
  .nav-toggle{display:inline-flex}
  .primary-nav{display:none;position:absolute;left:0;right:0;top:64px;background:#fff;border-bottom:1px solid var(--line);padding:18px 24px;flex-direction:column;align-items:flex-start}
  .primary-nav.open{display:flex}
  .primary-nav>ul{flex-direction:column;width:100%;gap:0}
  .primary-nav>ul li{width:100%}
  .primary-nav a{display:block;padding:12px 8px;border-bottom:1px solid var(--line)}
  .nav-cta{margin-top:14px;width:100%}
  .nav-cta .btn{flex:1;justify-content:center}
  .cta-banner{padding:36px 24px}
  .form .row-2{grid-template-columns:1fr}
}