:root{--bg: #1a1a2e;--card: #16213e;--accent: #0f3460;--blue: #4361ee;--green: #06d6a0;--red: #ef476f;--text: #e0e0e0;--dim: #8892b0;--radius: 12px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}.container{max-width:420px;margin:0 auto;padding:16px}.center{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh}.header{text-align:center;padding:24px 0 12px}.header h1{font-size:22px;margin-bottom:6px}.dim{color:var(--dim);font-size:14px;line-height:1.6}.steps-dots{display:flex;justify-content:center;gap:8px;margin:16px 0}.dot{width:10px;height:10px;border-radius:50%;background:var(--accent);transition:all .3s}.dot.active{background:var(--blue);transform:scale(1.3)}.dot.done{background:var(--green)}.card{background:var(--card);border-radius:var(--radius);padding:24px;margin-bottom:16px}.card h2{font-size:18px;margin-bottom:12px}.card p{margin-bottom:16px}.address-box{background:var(--bg);border:1px solid var(--accent);border-radius:8px;padding:12px;font-family:monospace;font-size:13px;word-break:break-all;margin:12px 0;text-align:center;color:var(--green)}.features{list-style:none;margin:16px 0}.features li{padding:8px 0;font-size:14px;color:var(--dim)}.features li:before{content:"✦";color:var(--blue)}.btn{display:block;width:100%;padding:14px;border:none;border-radius:var(--radius);font-size:16px;font-weight:600;cursor:pointer;transition:all .2s;text-align:center;text-decoration:none;color:#fff}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--blue)}.btn-green{background:var(--green);color:#1a1a2e}.badge{display:inline-block;padding:4px 10px;border-radius:20px;font-size:12px;font-weight:600}.badge-success{background:#06d6a026;color:var(--green)}.error-msg{background:#ef476f1a;border:1px solid var(--red);color:var(--red);padding:12px;border-radius:8px;font-size:13px;margin-top:12px}.spinner{display:inline-block;width:20px;height:20px;border:2px solid transparent;border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}.spinner.large{width:36px;height:36px;border-width:3px;margin-bottom:16px}@keyframes spin{to{transform:rotate(360deg)}}