/* Auros-inspired design system for ai-clinical-development.com
   Abyssal teal canvas · bioluminescent accents · instrument-like type */
:root{
  --bg0:#011d1c;
  --bg1:#012624;
  --card:#02302c;
  --card2:#003734;
  --line:rgba(94,234,212,.14);
  --line-soft:rgba(94,234,212,.08);
  --txt:#f4f8f7;
  --muted:#a9c2bc;
  --dim:#73928b;
  --pink:#fde9ff;
  --teal:#5eead4;
  --cyan:#67e8f9;
  --aurora:linear-gradient(115deg,#67e8f9 0%,#5eead4 35%,#f0abfc 70%,#fde9ff 100%);
  --r-card:16px;
  --r-sm:6px;
  --font:'Inter','Noto Sans SC',-apple-system,'PingFang SC','Microsoft YaHei',system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:var(--bg0);
  color:var(--txt);
  font-size:16px;line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
/* ambient background */
.orb-bg{position:fixed;inset:0;z-index:-2;overflow:hidden;pointer-events:none}
.orb-bg::before{content:'';position:absolute;width:60vw;height:60vw;right:-18vw;top:-12vw;
  background:radial-gradient(circle,rgba(45,212,191,.20) 0%,rgba(45,212,191,.05) 45%,transparent 70%);}
.orb-bg::after{content:'';position:absolute;width:44vw;height:44vw;left:-14vw;bottom:-10vw;
  background:radial-gradient(circle,rgba(240,171,252,.08) 0%,transparent 60%);}
#orbs{position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.55}
.wrap{max-width:1180px;margin:0 auto;padding:0 28px}
::selection{background:rgba(94,234,212,.35)}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);
  background:rgba(1,29,28,.72);border-bottom:1px solid var(--line-soft)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--txt)}
.brand-orb{width:26px;height:26px;border-radius:50%;
  background:radial-gradient(circle at 32% 30%,#a7f3ea,#2dd4bf 45%,#0d5f56 100%);
  box-shadow:0 0 18px rgba(45,212,191,.55)}
.brand-name{font-weight:500;letter-spacing:.02em;font-size:15px}
.brand-name small{display:block;font-size:10px;color:var(--dim);letter-spacing:.14em;font-weight:400}
.nav-links{display:flex;gap:30px;align-items:center}
.nav-links a{color:var(--muted);text-decoration:none;font-size:12px;letter-spacing:.14em;font-weight:500}
.nav-links a:hover{color:var(--txt)}
.nav-links .lang{color:var(--dim);border:1px solid var(--line-soft);border-radius:999px;
  padding:7px 14px;letter-spacing:.1em}
.nav-links .lang:hover{color:var(--txt);border-color:rgba(94,234,212,.4)}
.btn-pill{display:inline-flex;align-items:center;gap:10px;background:var(--aurora);color:#04211f;
  font-size:12px;font-weight:500;letter-spacing:.12em;padding:13px 24px;border-radius:999px;
  text-decoration:none;border:none;cursor:pointer;transition:transform .25s ease,filter .25s ease}
.btn-pill:hover{transform:translateY(-2px);filter:brightness(1.06)}
.btn-ghost{display:inline-flex;align-items:center;gap:10px;color:var(--txt);font-size:12px;
  letter-spacing:.12em;font-weight:500;padding:12px 22px;border-radius:999px;text-decoration:none;
  border:1px solid var(--line);transition:border-color .25s,background .25s}
.btn-ghost:hover{border-color:rgba(94,234,212,.45);background:rgba(94,234,212,.06)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;
  color:var(--txt);padding:8px 12px;font-size:13px;cursor:pointer}

/* ---------- hero ---------- */
.hero{padding:110px 0 84px;text-align:center;position:relative}
.kicker{font-size:12px;letter-spacing:.28em;color:var(--teal);font-weight:500;margin-bottom:26px}
.kicker .sep{color:var(--dim);margin:0 10px;letter-spacing:0}
.hero h1{font-size:clamp(40px,6.4vw,76px);font-weight:500;line-height:1.08;
  letter-spacing:-.02em;margin-bottom:26px}
.hero h1 .grad{background:var(--aurora);-webkit-background-clip:text;background-clip:text;color:transparent}
.lede{max-width:640px;margin:0 auto 40px;color:var(--muted);font-size:17px;line-height:1.75}
.hero-ctas{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.hero-note{margin-top:26px;font-size:12.5px;color:var(--dim);letter-spacing:.06em}

/* ---------- stats ---------- */
.stats{border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.stats-inner{display:grid;grid-template-columns:repeat(4,1fr);padding:34px 0;gap:20px}
.stat{text-align:center}
.stat b{display:block;font-size:clamp(30px,3.4vw,44px);font-weight:500;color:var(--pink);
  letter-spacing:-.02em;line-height:1.1}
.stat span{font-size:11px;letter-spacing:.18em;color:var(--dim);font-weight:500}

/* ---------- sections ---------- */
.section{padding:88px 0}
.section-head{margin-bottom:44px}
.section-head h2{font-size:clamp(28px,3.6vw,42px);font-weight:500;letter-spacing:-.015em;margin-top:16px}
.section-head p{color:var(--muted);margin-top:12px;max-width:620px;font-size:16px}
.grid-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{display:block;background:linear-gradient(160deg,var(--card) 0%,var(--bg1) 100%);
  border:1px solid var(--line-soft);border-radius:var(--r-card);padding:30px;
  text-decoration:none;color:var(--txt);transition:border-color .3s,transform .3s}
.card:hover{border-color:rgba(94,234,212,.4);transform:translateY(-4px)}
.card .tag{font-size:10px;letter-spacing:.22em;color:var(--teal);font-weight:500;margin-bottom:16px}
.card h3{font-size:20px;font-weight:500;margin-bottom:10px;letter-spacing:-.01em;line-height:1.4}
.card p{color:var(--muted);font-size:14.5px;line-height:1.7}
.card .go{margin-top:20px;display:inline-flex;align-items:center;gap:8px;font-size:12px;
  letter-spacing:.14em;color:var(--pink);font-weight:500}
.card .num{font-size:12px;color:var(--dim);letter-spacing:.1em;margin-bottom:14px;display:block}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.step{background:var(--bg1);border:1px solid var(--line-soft);border-radius:var(--r-card);padding:30px}
.step .n{font-size:44px;font-weight:500;color:var(--pink);letter-spacing:-.03em;line-height:1}
.step h3{font-size:18px;font-weight:500;margin:16px 0 10px}
.step p{color:var(--muted);font-size:14.5px;line-height:1.7}
.step a{color:var(--teal);font-size:13px;text-decoration:none;letter-spacing:.04em}
.step a:hover{text-decoration:underline}

/* ---------- article ---------- */
.article{max-width:780px;margin:0 auto;padding:72px 28px 40px}
.article .kicker{text-align:left}
.article h1{font-size:clamp(30px,4.6vw,48px);font-weight:500;letter-spacing:-.02em;
  line-height:1.25;margin:18px 0 20px}
.meta-row{display:flex;gap:18px;align-items:center;color:var(--dim);font-size:13px;
  letter-spacing:.06em;margin-bottom:36px;flex-wrap:wrap}
.meta-row .dot{width:4px;height:4px;border-radius:50%;background:var(--dim)}
.article-fig{border-radius:var(--r-card);margin:0 0 40px;min-height:220px;
  background:
    radial-gradient(circle at 78% 20%,rgba(45,212,191,.35),transparent 55%),
    radial-gradient(circle at 20% 85%,rgba(240,171,252,.18),transparent 50%),
    linear-gradient(150deg,#02302c,#011d1c);
  border:1px solid var(--line-soft);display:flex;align-items:flex-end;padding:28px}
.article-fig span{font-size:11px;letter-spacing:.22em;color:var(--teal);font-weight:500}
.prose{font-size:17px;line-height:1.85;color:#d7e4e1}
.prose p{margin-bottom:22px}
.prose h2{font-size:25px;font-weight:500;letter-spacing:-.01em;margin:46px 0 18px;color:var(--txt)}
.prose h3{font-size:19px;font-weight:500;margin:34px 0 14px;color:var(--txt)}
.prose ul,.prose ol{margin:0 0 24px 22px}
.prose li{margin-bottom:12px}
.prose strong{color:var(--txt);font-weight:500}
.prose a{color:var(--teal);text-decoration:underline;text-underline-offset:3px}
.callout{background:linear-gradient(160deg,var(--card2),var(--bg1));
  border:1px solid var(--line);border-left:3px solid var(--teal);
  border-radius:0 var(--r-card) var(--r-card) 0;padding:22px 24px;margin:30px 0}
.callout.pink{border-left-color:#f0abfc}
.callout b.t{font-size:11px;letter-spacing:.22em;color:var(--teal);display:block;margin-bottom:10px;font-weight:500}
.callout.pink b.t{color:#f0abfc}
.callout p{margin:0;font-size:15.5px}
.checklist{list-style:none;margin:0 0 26px}
.checklist li{position:relative;padding-left:34px;margin-bottom:14px}
.checklist li::before{content:'✓';position:absolute;left:0;top:1px;width:24px;height:24px;
  border-radius:50%;background:rgba(94,234,212,.12);color:var(--teal);
  display:flex;align-items:center;justify-content:center;font-size:13px}
.qa{border:1px solid var(--line-soft);border-radius:var(--r-card);margin-bottom:14px;
  background:var(--bg1);overflow:hidden}
.qa summary{cursor:pointer;padding:20px 24px;font-size:16.5px;font-weight:500;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:16px}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:'＋';color:var(--teal);font-size:20px;font-weight:400;flex-shrink:0}
.qa[open] summary::after{content:'－'}
.qa .a{padding:0 24px 22px;color:var(--muted);font-size:15.5px;line-height:1.8}
.disclaimer{border:1px dashed rgba(253,233,255,.35);border-radius:var(--r-card);
  padding:22px 24px;margin:44px 0;font-size:13.5px;color:var(--muted);line-height:1.75}
.disclaimer b{color:var(--pink);font-size:11px;letter-spacing:.22em;display:block;margin-bottom:8px;font-weight:500}
.cta-band{margin:60px 0 0;text-align:center;padding:64px 30px;border-radius:24px;
  background:
    radial-gradient(circle at 50% 120%,rgba(45,212,191,.22),transparent 60%),
    linear-gradient(160deg,var(--card2),var(--bg1));
  border:1px solid var(--line)}
.cta-band h2{font-size:clamp(24px,3.4vw,36px);font-weight:500;letter-spacing:-.015em;margin-bottom:14px}
.cta-band p{color:var(--muted);margin-bottom:30px;font-size:15.5px}
.prevnext{display:flex;justify-content:space-between;gap:16px;margin:50px 0 20px;flex-wrap:wrap}
.prevnext a{flex:1;min-width:220px;background:var(--bg1);border:1px solid var(--line-soft);
  border-radius:var(--r-card);padding:20px 24px;text-decoration:none;color:var(--txt);transition:border-color .3s}
.prevnext a:hover{border-color:rgba(94,234,212,.4)}
.prevnext small{display:block;font-size:10px;letter-spacing:.22em;color:var(--dim);margin-bottom:8px}
.prevnext span{font-size:15px;font-weight:500}

/* ---------- faq page ---------- */
.faq-list{max-width:820px;margin:0 auto}
.gloss{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:30px}
.gloss .g{background:var(--bg1);border:1px solid var(--line-soft);border-radius:var(--r-card);padding:22px}
.gloss .g b{display:block;font-size:16px;font-weight:500;margin-bottom:8px;color:var(--pink)}
.gloss .g p{font-size:14px;color:var(--muted);margin:0;line-height:1.7}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line-soft);margin-top:40px;padding:56px 0 40px}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:40px}
.foot-grid h4{font-size:11px;letter-spacing:.22em;color:var(--dim);font-weight:500;margin-bottom:16px}
.foot-grid a{display:block;color:var(--muted);text-decoration:none;font-size:14px;margin-bottom:10px}
.foot-grid a:hover{color:var(--txt)}
.foot-note{font-size:12.5px;color:var(--dim);line-height:1.8;border-top:1px solid var(--line-soft);
  padding-top:28px}
.foot-note b{color:var(--muted);font-weight:500}

/* ---------- responsive ---------- */
@media(max-width:960px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-links{display:none}
  .nav-toggle{display:block}
  .nav-links.open{display:flex;position:absolute;top:68px;left:0;right:0;flex-direction:column;
    background:rgba(1,29,28,.97);padding:24px;gap:20px;border-bottom:1px solid var(--line)}
}
@media(max-width:640px){
  .grid-cards,.grid-3,.steps,.gloss{grid-template-columns:1fr}
  .stats-inner{grid-template-columns:repeat(2,1fr)}
  .hero{padding:72px 0 60px}
  .foot-grid{grid-template-columns:1fr}
}