:root{--bg:#fff;--text:#0b1021;--muted:#5e6370;--border:#e5e7eb;--card:#fff;--accent:#06f;--accent-2:#111827;--shadow:0 12px 30px rgba(0,0,0,.08)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.page-shell{max-width:1100px;margin:40px auto;padding:0 20px;display:flex;flex-direction:column;gap:20px}.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:20px;box-shadow:var(--shadow)}.card-header{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap}.btn{border:none;border-radius:12px;padding:10px 16px;font-weight:600;cursor:pointer;transition:transform .15s ease,box-shadow .2s ease}.btn-primary{background:var(--accent);color:#fff;box-shadow:0 10px 20px rgba(0,102,255,.2)}.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text)}.btn-ghost{background:#f5f6fb;border:1px solid transparent;color:var(--text)}.btn:disabled{opacity:.6;cursor:not-allowed}.btn:hover:not(:disabled){transform:translateY(-1px)}.auth-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.pill{padding:6px 10px;border-radius:10px;background:#eef3ff;color:#1c4dff;font-size:.9rem}.muted{color:var(--muted)}.error-text{color:#c1121f;margin:8px 0;font-size:.95rem}.plan-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));grid-gap:16px;gap:16px;margin-top:16px}.plan-card{border:1px solid var(--border);border-radius:14px;padding:16px;background:#f8fafc}.price{font-size:1.6rem;font-weight:800}.eyebrow{text-transform:uppercase;letter-spacing:.08em;font-size:.85rem;color:var(--muted);font-weight:700}.chat-shell{display:flex;flex-direction:column;gap:14px}.chat-header{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}.chat-actions{display:flex;gap:8px}.chat-messages{border:1px solid var(--border);border-radius:14px;padding:12px;min-height:260px;background:#f9fafb;display:flex;flex-direction:column;gap:10px}.chat-bubble{background:#fff;border:1px solid var(--border);border-radius:12px;padding:10px 12px;box-shadow:0 4px 12px rgba(0,0,0,.04)}.chat-bubble.user{border-color:#d7e3ff;background:#eef3ff}.chat-bubble.assistant{border-color:#e5e7eb}.chat-role{font-weight:700;margin-bottom:4px;font-size:.9rem}.chat-input-row{display:flex;gap:10px;align-items:center}.chat-input-row input{flex:1 1;padding:12px;border-radius:12px;border:1px solid var(--border);font-size:1rem}.layout{max-width:1200px;margin:0 auto;padding:0 24px 60px}.topbar{justify-content:space-between;padding:20px 0;position:-webkit-sticky;position:sticky;top:0;background:hsla(0,0%,100%,.9);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:10;border-bottom:1px solid var(--border)}.logo,.topbar{display:flex;align-items:center}.logo{gap:8px;font-weight:800;font-size:1.2rem}.nav{display:flex;gap:16px;font-weight:600}.hero{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));grid-gap:32px;gap:32px;padding:40px 0 60px;align-items:center}.hero h1{font-size:clamp(2rem,3vw,3.2rem);line-height:1.1;margin-bottom:16px}.hero p{color:var(--muted);margin-bottom:20px}.badge{display:inline-flex;align-items:center;gap:8px;background:#eef3ff;color:#1c4dff;padding:6px 12px;border-radius:999px;font-weight:700;font-size:.9rem}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.hero-card{background:radial-gradient(circle at 30% 20%,#ffedd5 0,#f0f4ff 40%,#e7f0ff 75%);border-radius:20px;min-height:240px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.2rem;box-shadow:var(--shadow)}.section{padding:40px 0}.section h2{font-size:2rem;margin-bottom:10px}.section p.lead{color:var(--muted);max-width:640px}.courses-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));grid-gap:18px;gap:18px;margin-top:24px}.course-card{border:1px solid var(--border);border-radius:14px;padding:18px;background:#fff;box-shadow:0 8px 18px rgba(0,0,0,.06)}.vip-section{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));grid-gap:18px;gap:18px;align-items:center}footer{padding:40px 0;color:var(--muted);border-top:1px solid var(--border);text-align:center;margin-top:40px}