:root{--primary: #6366f1;--primary-dark: #4f46e5;--bg: #f8fafc;--text: #0f172a;--muted: #64748b;--card: #ffffff;--border: #e2e8f0;--success: #10b981;--danger: #ef4444;--shadow: 0 20px 50px rgba(15, 23, 42, .08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,system-ui,-apple-system,sans-serif;color:var(--text);background:var(--bg);line-height:1.6}a{color:inherit}.container{width:min(1120px,calc(100% - 40px));margin:0 auto}.page-shell{min-height:100vh}.site-header{position:sticky;top:0;z-index:10;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#f8fafcd9;border-bottom:1px solid var(--border)}.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:72px}.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;color:var(--text);font-weight:700}.brand-mark{width:40px;height:40px;border-radius:14px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,var(--primary),var(--primary-dark));font-weight:800}.nav-links{display:flex;gap:24px}.nav-links a{color:var(--muted);text-decoration:none;font-size:14px;font-weight:500}.nav-links a:hover{color:var(--primary)}.hero{padding:72px 0 48px;background:radial-gradient(circle at top right,rgba(99,102,241,.12),transparent 40%),linear-gradient(180deg,#eef2ff 0%,var(--bg) 100%)}.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}.eyebrow{color:var(--primary);font-size:13px;font-weight:600;letter-spacing:.04em;text-transform:uppercase}.hero h1,.refer-card h1{font-size:clamp(2rem,5vw,3.2rem);line-height:1.08;margin:12px 0 18px}.gradient-text{background:linear-gradient(135deg,var(--primary),var(--primary-dark));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.lead{color:var(--muted);font-size:1.05rem;max-width:560px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:28px 0}.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 22px;border-radius:16px;font-weight:600;text-decoration:none;border:1px solid transparent;cursor:pointer;font-size:15px;transition:transform .15s ease,box-shadow .15s ease}.btn:hover{transform:translateY(-1px)}.btn:disabled{opacity:.65;cursor:not-allowed;transform:none}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 12px 24px #6366f140}.btn-secondary{background:#fff;color:var(--text);border-color:var(--border)}.btn-block{width:100%}.hero-card,.refer-card{background:var(--card);border-radius:28px;overflow:hidden;box-shadow:var(--shadow);border:1px solid #e8edff}.hero-card-top{height:5px;background:linear-gradient(90deg,var(--primary),#818cf8,var(--primary-dark))}.hero-card-body{padding:28px}.card-label{color:var(--success);font-size:12px;font-weight:600;margin:0 0 8px}.card-code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.95rem;word-break:break-all;margin:0 0 8px}.card-sub,.muted{color:var(--muted)}.muted.small{font-size:13px}.section{padding:72px 0}.section-head{text-align:center;max-width:640px;margin:0 auto 40px}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}.feature-card{background:var(--card);border:1px solid var(--border);border-radius:24px;padding:24px;box-shadow:0 8px 24px #0f172a0a}.feature-card code{background:#eef2ff;padding:2px 6px;border-radius:6px;font-size:.85em}.site-footer{border-top:1px solid var(--border);background:#fff;padding:32px 0}.join-main{padding:48px 0 72px;display:flex;justify-content:center}.refer-card{width:min(560px,100%);padding:32px}.code-box{background:#f8faff;border:1px solid #e8edff;border-radius:18px;padding:18px;margin:20px 0;display:grid;gap:6px}.code-box.warn{border-color:#fde68a;background:#fffbeb}.code-value{font-size:1.75rem;letter-spacing:.08em}.status{margin-top:14px;font-size:14px;border-radius:12px;padding:12px 14px}.status.ok{background:#ecfdf5;color:#047857}.status.err{background:#fef2f2;color:var(--danger)}.steps{margin:24px 0 0;padding-left:20px;color:var(--muted);font-size:14px}.steps li+li{margin-top:8px}@media(max-width:900px){.hero-grid{grid-template-columns:1fr}.nav-links{display:none}}