* { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: 'IBM Plex Sans', sans-serif;
            background: var(--surface-sponsor);
            color: var(--text-primary);
            min-height: 100vh;
            min-height: 100dvh;
        }

        /* Auth gate */
        .auth-gate {
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            text-align: center;
            padding: 2rem;
        }
        .auth-gate-box {
            background: var(--bg-secondary);
            border-radius: 16px;
            padding: 3rem 2rem;
            max-width: 400px;
            border: 1px solid var(--border);
        }
        .auth-gate-box h2 { margin-bottom: 1rem; }
        .auth-gate-box p { color: var(--text-secondary); margin-bottom: 1.5rem; }
        .auth-gate-box .btn {
            display: inline-block;
            padding: 0.75rem 2rem;
            background: var(--accent);
            color: #fff;
            text-decoration: none;
            border-radius: 10px;
            font-weight: 600;
            font-family: inherit;
            border: none;
            cursor: pointer;
            font-size: 1rem;
        }
        .auth-gate-box .btn:hover { opacity: 0.9; }

        /* Main content (hidden until auth) */
        .sponsor-content { display: none; }

        .container { max-width: 960px; margin: 0 auto; padding: 20px; }

        /* Top nav */
        .top-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1rem 0;
            margin-bottom: 1rem;
        }
        .top-bar a {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.95rem;
        }
        .top-bar a:hover { color: var(--text-primary); }
        .top-bar .user-badge {
            color: var(--nano);
            font-weight: 600;
        }

        /* Hero */
        .hero {
            text-align: center;
            padding: 40px 20px 30px;
        }
        .hero-icon { font-size: 3rem; margin-bottom: 0.5rem; }
        .hero h1 {
            font-size: clamp(1.8rem, 5vw, 2.5rem);
            font-weight: 800;
            margin-bottom: 0.5rem;
            background: linear-gradient(135deg, var(--nano), var(--gold));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 550px;
            margin: 0 auto;
            line-height: 1.6;
        }
        .hero .nano-addr {
            display: inline-block;
            margin-top: 1rem;
            padding: 0.5rem 1rem;
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 8px;
            font-family: monospace;
            font-size: 0.7rem;
            color: var(--nano);
            word-break: break-all;
            max-width: 100%;
            cursor: pointer;
            transition: border-color 0.2s;
        }
        .hero .nano-addr:hover { border-color: var(--nano); }
        .hero .copy-hint {
            font-size: 0.75rem;
            color: var(--text-secondary);
            margin-top: 0.3rem;
        }

        /* Tiers */
        .tiers {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin: 40px 0;
        }

        .tier-card {
            background: var(--bg-secondary);
            border: 2px solid var(--border);
            border-radius: 16px;
            padding: 28px 24px;
            position: relative;
            transition: transform 0.2s, border-color 0.3s;
            display: flex;
            flex-direction: column;
        }
        .tier-card:hover { transform: translateY(-4px); }

        .tier-card.t-supporter { border-color: var(--nano); }
        .tier-card.t-event { border-color: var(--accent); }
        .tier-card.t-gold { border-color: var(--gold); }

        .tier-icon { font-size: 2.2rem; margin-bottom: 0.5rem; }

        .tier-name {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 0.25rem;
        }

        .tier-price {
            font-size: 1.6rem;
            font-weight: 800;
            margin-bottom: 0.25rem;
        }
        .t-supporter .tier-price { color: var(--nano); }
        .t-event .tier-price { color: var(--accent); }
        .t-gold .tier-price { color: var(--gold); }

        .tier-price-sub {
            font-size: 0.8rem;
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }

        .tier-features {
            list-style: none;
            flex-grow: 1;
        }
        .tier-features li {
            padding: 5px 0;
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.5;
        }
        .tier-features li::before {
            content: '✓ ';
            color: var(--success);
            font-weight: bold;
        }
        .tier-features li.highlight-feature {
            color: var(--text-primary);
            font-weight: 600;
        }

        .tier-btn {
            display: block;
            width: 100%;
            padding: 12px;
            min-height: 44px;
            margin-top: 1.25rem;
            border: none;
            border-radius: 10px;
            font-family: inherit;
            font-size: 0.95rem;
            font-weight: 700;
            cursor: pointer;
            transition: opacity 0.2s;
            color: #fff;
        }
        .tier-btn:hover { opacity: 0.85; }
        .t-supporter .tier-btn { background: var(--nano); }
        .t-event .tier-btn { background: var(--accent); }
        .t-gold .tier-btn { background: linear-gradient(135deg, var(--gold), var(--gold-dark)); color: #1a1a1b; }

        .tier-badge {
            position: absolute;
            top: 12px;
            right: 12px;
            font-size: 0.7rem;
            font-weight: 700;
            padding: 3px 10px;
            border-radius: 20px;
            color: #fff;
        }
        .t-event .tier-badge { background: var(--accent); }

        /* How it works */
        .how-section {
            margin: 40px 0;
            text-align: center;
        }
        .how-section h2 {
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
        }
        .how-steps {
            display: flex;
            gap: 1.5rem;
            justify-content: center;
            flex-wrap: wrap;
        }
        .how-step {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 1.25rem;
            width: 200px;
            text-align: center;
        }
        .how-step .step-num {
            width: 32px;
            height: 32px;
            background: var(--nano);
            color: #fff;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
        }
        .how-step p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* Form */
        .form-section {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 32px;
            margin: 40px 0;
        }
        .form-section h2 {
            font-size: 1.4rem;
            margin-bottom: 0.5rem;
        }
        .form-section .form-desc {
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-bottom: 1.5rem;
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 5px;
        }
        .form-group.full { grid-column: 1 / -1; }
        .form-group label {
            font-size: 0.82rem;
            color: var(--text-secondary);
            font-weight: 500;
        }
        .form-group input,
        .form-group select,
        .form-group textarea {
            padding: 10px 14px;
            background: var(--bg-input);
            border: 1px solid var(--border);
            border-radius: 8px;
            color: var(--text-primary);
            font-family: inherit;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.2s;
        }
        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus { border-color: var(--nano); }
        .form-group textarea { resize: vertical; min-height: 80px; }

        .nano-wallet-group {
            background: rgba(32, 156, 233, 0.06);
            border: 1px dashed var(--nano);
            border-radius: 10px;
            padding: 14px;
            grid-column: 1 / -1;
        }
        .nano-wallet-group label { color: var(--nano); }

        .btn-submit {
            display: block;
            width: 100%;
            padding: 14px;
            min-height: 44px;
            margin-top: 20px;
            background: linear-gradient(135deg, var(--nano), var(--nano-dark));
            color: #fff;
            border: none;
            border-radius: 10px;
            font-family: inherit;
            font-size: 1rem;
            font-weight: 700;
            cursor: pointer;
            transition: opacity 0.2s;
        }
        .btn-submit:hover { opacity: 0.9; }
        .btn-submit:disabled { opacity: 0.5; cursor: not-allowed; }

        .form-message {
            text-align: center;
            padding: 12px;
            border-radius: 8px;
            margin-top: 16px;
            display: none;
            font-size: 0.95rem;
        }
        .form-message.success { display: block; background: rgba(34,197,94,0.12); color: var(--success); }
        .form-message.error { display: block; background: rgba(239,68,68,0.12); color: #ef4444; }

        /* Gold name preview */
        .gold-preview {
            display: inline-block;
            padding: 2px 8px;
            background: linear-gradient(135deg, var(--gold), #FFA500);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 800;
        }

        /* Footer */
        .footer {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-secondary);
            font-size: 0.85rem;
        }
        .footer a { color: var(--nano); text-decoration: none; }
        .footer a:hover { text-decoration: underline; }

        /* FAQ */
        .faq-section { margin: 30px 0; }
        .faq-section h2 { font-size: 1.4rem; margin-bottom: 1.25rem; text-align: center; }
        .faq-item {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 16px 20px;
            margin-bottom: 10px;
        }
        .faq-item h3 {
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 0.4rem;
            color: var(--text-primary);
        }
        .faq-item p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        .hero-payment-note {
            margin-top: 0.75rem;
            font-size: 0.95rem;
            color: var(--text-secondary);
        }

        .nano-highlight {
            color: var(--nano);
            font-weight: 600;
        }

        .fwallet-input {
            width: 100%;
            margin-top: 6px;
        }

        .footer-note {
            margin-top: 0.5rem;
        }

        @media (max-width: 768px) {
            .container {
                padding: 12px;
            }

            .top-bar {
                position: sticky;
                top: 48px;
                background: rgba(26, 26, 27, 0.92);
                backdrop-filter: blur(10px);
                z-index: 20;
                padding: 10px 0;
            }

            .hero {
                padding: 24px 8px 18px;
            }

            .tiers {
                grid-template-columns: 1fr;
            }

            .how-steps {
                gap: 10px;
            }

            .how-step {
                width: 100%;
            }

            .form-section {
                padding: 16px;
            }

            .form-grid {
                grid-template-columns: 1fr;
            }

            .form-group input,
            .form-group select,
            .form-group textarea,
            .nano-wallet-group input {
                min-height: 44px;
                font-size: 16px;
            }
        }

        @media (max-width: 390px) {
            .hero h1 {
                font-size: 1.6rem;
            }

            .tier-card {
                padding: 20px 16px;
            }

            .faq-item {
                padding: 14px;
            }
        }

        @media (max-width: 360px) {
            .container {
                padding: 10px;
            }
        }