:root{
  --bg:#f6f8fb; --card:#fff; --accent:#0d6efd; --muted:#6b7280;
  --radius:12px; --shadow: 0 10px 30px rgba(16,24,40,0.08); --maxw:1200px;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, Arial;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:#0f172a;-webkit-font-smoothing:antialiased}
.container{max-width:var(--maxw);margin:0 auto;padding:20px}
.demo-header{background:#fff;border-bottom:1px solid rgba(15,23,42,0.05)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 20px}
.brand{font-weight:800;color:var(--accent);text-decoration:none;font-size:18px}
.nav a{margin-left:18px;color:#111;text-decoration:none;font-size:14px}
.nav a.active{font-weight:700;color:var(--accent)}

.hero{padding:28px 0}
.hero-inner{display:flex;gap:28px;align-items:center}
.hero-left{flex:1}
.hero-left h1{font-size:28px;margin:0 0 8px}
.lead{color:var(--muted);margin:0 0 16px}

.media-card{border-radius:12px;overflow:hidden;box-shadow:var(--shadow);margin-top:14px}
.hero-video{width:100%;height:260px;object-fit:cover;display:block}

.hero-right{width:320px;max-width:38%}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}
.quick-actions h3{margin:0 0 8px}
.presets{display:flex;flex-direction:column;gap:8px}
.preset{border:1px solid #e8eefb;background:#f8fbff;color:var(--accent);padding:8px;border-radius:8px;cursor:pointer}

.main-grid{display:grid;grid-template-columns:1fr 380px;gap:22px;padding:18px 20px}
@media (max-width:900px){ .hero-inner{flex-direction:column} .main-grid{grid-template-columns:1fr} .hero-video{height:160px} .hero-right{max-width:100%} }

.form-card h2{margin:0 0 12px}
.demo-form label{display:block;margin-bottom:12px;font-size:14px;color:#0f172a}
.inline{display:flex;gap:10px;align-items:center}
.inline input[type="number"]{width:110px;padding:8px;border-radius:8px;border:1px solid #e6eef8}
.demo-form input[type="range"]{width:100%}
.demo-form select,input[type="email"],input[type="number"],textarea{
  width:100%;padding:10px;border:1px solid #e6eef8;border-radius:8px;background:#fff;font-size:14px;
}
.symptoms{border-top:1px dashed #eef4ff;padding-top:12px;margin-top:12px}
.symptoms label{display:block;margin:6px 0;font-size:14px}

.form-actions{display:flex;gap:12px;align-items:center;margin-top:8px}
.btn-primary{background:var(--accent);color:#fff;border:none;padding:10px 14px;border-radius:8px;cursor:pointer;font-weight:700}
.btn-ghost{background:transparent;border:1px solid #e6eef8;padding:10px 12px;border-radius:8px;cursor:pointer}

.result-card{min-height:160px;overflow:auto;position:relative}
.result-card h3{margin:0 0 8px}
.result-summary{padding:12px;border-radius:10px;background:linear-gradient(90deg,#f8fbff,#ffffff);margin-bottom:12px}
.result-steps{list-style:decimal;padding-left:20px;margin:0 0 12px}
.result-meta{color:var(--muted);font-size:13px;margin-top:12px}

.health-bars{display:flex;flex-direction:column;gap:10px}
.bar-row{display:flex;align-items:center;gap:10px}
.bar-label{width:130px;font-size:13px;color:var(--muted)}
.bar{flex:1;height:12px;background:#eef3ff;border-radius:8px;overflow:hidden}
.bar-inner{height:100%;background:linear-gradient(90deg,#0d6efd,#5aa8ff);width:0%}

.site-footer{padding:28px 0;text-align:center;color:var(--muted);font-size:13px}