:root {
            --primary: #0f766e;
            --primary-hover: #115e59;
            --danger: #dc2626;
            --success: #059669;
            --warning: #d97706;
            --bg: #f2f7f7;
            --surface: #ffffff;
            --text: #111827;
            --muted: #6b7280;
            --border: #d1d5db;
            --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
            --bg-grad-1: radial-gradient(1000px 560px at 6% -8%, #d1fae5 0%, transparent 60%);
            --bg-grad-2: radial-gradient(900px 520px at 100% -10%, #dbeafe 0%, transparent 60%);
        }
        [data-theme="dark"] {
            --primary: #2dd4bf;
            --primary-hover: #14b8a6;
            --danger: #f87171;
            --success: #34d399;
            --warning: #fbbf24;
            --bg: #0b1220;
            --surface: #111827;
            --text: #e5e7eb;
            --muted: #93a3bc;
            --border: #23304a;
            --shadow: 0 16px 38px rgba(2, 6, 23, 0.55);
            --bg-grad-1: radial-gradient(1000px 560px at 6% -8%, rgba(45, 212, 191, 0.16) 0%, transparent 60%);
            --bg-grad-2: radial-gradient(900px 520px at 100% -10%, rgba(59, 130, 246, 0.2) 0%, transparent 60%);
        }
        * { box-sizing: border-box; }
        body {
            margin: 0 auto;
            max-width: 980px;
            padding: 2rem 1.25rem 3rem;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.6;
            color: var(--text);
            background: var(--bg-grad-1), var(--bg-grad-2), var(--bg);
        }
        .hidden { display: none !important; }
        header { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
        .title { font-size: 1.6rem; font-weight: 700; letter-spacing: 0.2px; }
        .subtitle { color: var(--muted); font-size: 0.95rem; }
        .header-actions { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
        .nav-link {
            text-decoration: none;
            border: 1px solid var(--border);
            color: var(--text);
            padding: 0.48rem 0.9rem;
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 600;
            background: rgba(255, 255, 255, 0.55);
        }
        [data-theme="dark"] .nav-link { background: rgba(15, 23, 42, 0.45); }
        .nav-link:hover { border-color: var(--primary); color: var(--primary); }
        .theme-toggle {
            background: transparent;
            color: var(--text);
            border: 1px solid var(--border);
            padding: 0.5rem 1rem;
            border-radius: 8px;
            cursor: pointer;
        }
        .theme-toggle:hover { background: rgba(20, 184, 166, 0.08); }
        .card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 14px;
            box-shadow: var(--shadow);
            padding: 1.5rem;
            margin-bottom: 1.1rem;
        }
        h2 { margin: 0 0 0.8rem; }
        h3 { margin: 0 0 1rem; }
        .user-profile-card { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
        .user-info { display: flex; align-items: center; gap: 1rem; }
        img.avatar { width: 64px; height: 64px; border-radius: 50%; border: 3px solid var(--bg); box-shadow: 0 2px 6px rgba(0,0,0,0.12); object-fit: cover; }
        .username-row { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; }
        .username-row h3 { margin: 0; }
        .btn-logout-small { padding: 4px 10px; font-size: 0.75rem; background: #fee2e2; color: #ef4444; border-radius: 6px; border: 1px solid #fca5a5; font-weight: bold; box-shadow: none; cursor: pointer; }
        .btn-logout-small:hover { background: #fecaca; transform: translateY(0); }
        [data-theme="dark"] .btn-logout-small { background: rgba(239, 68, 68, 0.15); color: #fca5a5; border-color: rgba(239, 68, 68, 0.3); }
        [data-theme="dark"] .btn-logout-small:hover { background: rgba(239, 68, 68, 0.25); }
        .user-id { font-size: 0.85rem; color: var(--muted); font-family: monospace; }
        .user-assets { text-align: right; }
        .asset-value { font-size: 1.5rem; font-weight: bold; color: var(--warning); cursor: pointer; display: inline-flex; align-items: center; gap: 6px; padding: 4px 8px; border-radius: 8px; transition: background 0.2s; margin-right: -8px; }
        .asset-value:hover { background: #fef3c7; }
        [data-theme="dark"] .asset-value:hover { background: rgba(245, 158, 11, 0.15); }
        .refresh-icon { font-size: 1.1rem; opacity: 0.7; }
        @media (max-width: 600px) {
            .user-profile-card { flex-direction: column; align-items: flex-start; }
            .user-assets { text-align: left; margin-top: 0.5rem; }
            .asset-value { margin-left: -8px; }
        }
        .mini-btn {
            border: 1px solid var(--border);
            background: transparent;
            color: var(--text);
            border-radius: 8px;
            padding: 0.45rem 0.7rem;
            cursor: pointer;
            font-size: 0.82rem;
            font-weight: 600;
        }
        .mini-btn:hover { border-color: var(--primary); color: var(--primary); }
        .danger-btn { border-color: #fca5a5; color: var(--danger); }
        .danger-btn:hover { background: rgba(220, 38, 38, 0.08); border-color: var(--danger); color: var(--danger); }
        .form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0.9rem; }
        .form-group { display: flex; flex-direction: column; gap: 0.4rem; }
        .form-group label { font-size: 0.87rem; font-weight: 600; color: var(--muted); }
        .form-group input, .form-group textarea, .form-group select {
            border: 1px solid var(--border);
            border-radius: 8px;
            background: #fff;
            color: var(--text);
            font-size: 0.95rem;
            padding: 0.62rem 0.72rem;
            outline: none;
            width: 100%;
        }
        [data-theme="dark"] .form-group input,
        [data-theme="dark"] .form-group textarea,
        [data-theme="dark"] .form-group select {
            background: #0b1220;
            color: #e5e7eb;
            border-color: #23304a;
        }
        .form-group textarea { min-height: 90px; resize: vertical; }
        .form-group input:focus, .form-group textarea:focus, .form-group select:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.16);
        }
        .hint { color: var(--muted); font-size: 0.8rem; margin-top: 0.15rem; }
        .section-row { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.7rem; margin-bottom: 0.8rem; }
        .prize-list { display: flex; flex-direction: column; gap: 0.75rem; }
        .prize-item {
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 0.95rem;
            background: rgba(255,255,255,0.7);
        }
        [data-theme="dark"] .prize-item { background: rgba(11, 18, 32, 0.65); }
        .prize-head { display: flex; align-items: center; justify-content: space-between; gap: 0.65rem; margin-bottom: 0.65rem; }
        .prize-title { font-size: 0.96rem; font-weight: 700; }
        .btn {
            border: none;
            border-radius: 8px;
            background: var(--primary);
            color: white;
            padding: 0.65rem 1.1rem;
            font-size: 0.95rem;
            font-weight: 700;
            cursor: pointer;
        }
        .btn:hover { background: var(--primary-hover); }
        .btn:disabled { opacity: 0.55; cursor: not-allowed; }
        .btn:disabled:hover { background: var(--primary); }
        .btn-wide { width: 100%; margin-top: 1rem; padding: 0.85rem 1rem; }
        .btn-outline {
            border: 1px solid var(--border);
            background: transparent;
            color: var(--text);
        }
        .btn-outline:hover { border-color: var(--primary); color: var(--primary); background: rgba(20, 184, 166, 0.08); }
        #resultCard { border: 1px dashed var(--border); border-radius: 12px; padding: 0.9rem; margin-top: 0.9rem; }
        #resultId { font-family: monospace; font-size: 1rem; font-weight: 700; color: var(--primary); word-break: break-all; }
        .history-header { display: flex; justify-content: space-between; align-items: center; gap: 0.75rem; margin-bottom: 0.8rem; flex-wrap: wrap; }
        .history-list { display: flex; flex-direction: column; gap: 0.75rem; }
        .history-item { border: 1px solid var(--border); border-radius: 10px; background: rgba(255,255,255,0.7); padding: 0.8rem; }
        [data-theme="dark"] .history-item { background: rgba(11, 18, 32, 0.65); }
        .history-top { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; margin-bottom: 0.45rem; flex-wrap: wrap; }
        .history-name { font-weight: 700; }
        .history-meta { color: var(--muted); font-size: 0.82rem; }
        .history-id-row { margin-top: 0.65rem; padding-top: 0.6rem; border-top: 1px dashed var(--border); display: flex; justify-content: space-between; align-items: center; gap: 0.6rem; flex-wrap: wrap; }
        .history-id-btn { border: none; padding: 0; background: transparent; color: var(--primary); cursor: pointer; font-size: 0.84rem; font-weight: 700; font-family: monospace; }
        .history-id-btn:hover { text-decoration: underline; }
        .history-actions { display: flex; gap: 0.5rem; align-items: center; }
        .history-tag { display: inline-flex; align-items: center; border-radius: 999px; padding: 0.16rem 0.5rem; font-size: 0.74rem; border: 1px solid var(--border); color: var(--muted); }
        .history-tag.ok { color: var(--success); border-color: rgba(5, 150, 105, 0.35); }
        .history-tag.cancel { color: var(--danger); border-color: rgba(220, 38, 38, 0.35); }
        .empty-tip { color: var(--muted); text-align: center; padding: 1rem 0; }
        .modal-root { position: fixed; inset: 0; z-index: 2200; display: flex; align-items: center; justify-content: center; }
        .modal-backdrop { position: absolute; inset: 0; background: rgba(2, 6, 23, 0.48); backdrop-filter: blur(4px); }
        .modal-card { position: relative; width: min(860px, 94vw); max-height: 88vh; border-radius: 14px; border: 1px solid var(--border); box-shadow: var(--shadow); background: var(--surface); display: flex; flex-direction: column; overflow: hidden; }
        .modal-header { padding: 1rem 1.2rem 0.85rem; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: flex-start; gap: 0.8rem; }
        .modal-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.2rem; }
        .modal-subtitle { font-size: 0.78rem; color: var(--muted); font-family: monospace; word-break: break-all; }
        .modal-close { border: 1px solid var(--border); background: transparent; border-radius: 999px; width: 32px; height: 32px; font-size: 1.1rem; line-height: 1; color: var(--muted); cursor: pointer; }
        .modal-close:hover { border-color: var(--primary); color: var(--primary); }
        .modal-body { padding: 0.95rem 1.2rem; overflow: auto; }
        .modal-summary { margin-bottom: 0.7rem; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0.5rem 0.8rem; color: var(--muted); font-size: 0.84rem; }
        .modal-summary strong { color: var(--text); }
        .win-list { display: flex; flex-direction: column; gap: 0.65rem; }
        .win-item { border: 1px solid var(--border); border-radius: 10px; padding: 0.7rem 0.8rem; background: rgba(255,255,255,0.68); display: flex; gap: 0.75rem; align-items: center; }
        [data-theme="dark"] .win-item { background: rgba(11, 18, 32, 0.68); }
        .win-avatar { width: 42px; height: 42px; border-radius: 50%; border: 1px solid var(--border); object-fit: cover; }
        .win-main { min-width: 0; flex: 1; }
        .win-user { font-weight: 700; display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
        .win-prize { color: var(--warning); font-weight: 700; }
        .win-meta { color: var(--muted); font-size: 0.8rem; }
        .modal-footer { border-top: 1px solid var(--border); padding: 0.85rem 1.2rem 1rem; display: flex; justify-content: flex-end; gap: 0.6rem; }
        .error-text { color: var(--danger); font-size: 0.82rem; font-weight: 600; margin-top: 0.6rem; }
        #toast-container { position: fixed; top: 18px; right: 18px; z-index: 5000; display: flex; flex-direction: column; gap: 10px; }
        .toast {
            color: white;
            border-radius: 8px;
            padding: 11px 14px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.16);
            font-size: 0.88rem;
            font-weight: 600;
            opacity: 0;
            transform: translateX(90%);
            transition: all 0.25s ease;
        }
        .toast.show { opacity: 1; transform: translateX(0); }
        .toast.success { background: var(--success); }
        .toast.error { background: var(--danger); }
        .toast.warning { background: var(--warning); }
        .toast.info { background: #2563eb; }