@import url('https://fonts.googleapis.com/css2?family=Prompt:wght@300;400;500;600;700&display=swap');
        /* Performance: GPU layers, contain, smooth transitions */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            overflow-x: hidden;
            -webkit-tap-highlight-color: transparent;
        }

        body {
            font-family: 'Prompt', 'Segoe UI', sans-serif;
            background-color: #00a8ff;
            background-image: url('./2.png');
            background-repeat: no-repeat;
            background-position: center;
            background-size: cover;
            background-attachment: fixed;
            min-height: 100vh;
            padding: 15px;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            position: relative;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(0, 255, 255, 0.64) 0%, rgba(0, 17, 255, 0.678) 100%);
            pointer-events: none;
            z-index: -1;
        }

        .page-container {
            max-width: 1200px;
            width: 100%;
            margin: 0 auto;
            padding: 0 15px;
            box-sizing: border-box;
        }

        .top-section {
            display: flex;
            gap: 30px;
            justify-content: center;
            align-items: flex-start;
            flex-wrap: wrap;
            margin-bottom: 30px;
            padding-top: 40px;
            width: 100%;
            min-width: 0;
        }

        .code-card {
            background: rgba(255,255,255,0.12);
            backdrop-filter: blur(15px);
            border-radius: 24px;
            padding: 28px;
            border: 1px solid rgba(255,255,255,0.2);
            width: 100%;
            max-width: 380px;
            min-width: 0;
            box-shadow: 0 10px 40px rgba(0,0,0,0.2);
            margin-top: 100px;
            margin-left: 20px;
            transform: translateZ(0);
            box-sizing: border-box;
            contain: layout paint;
        }

        .code-card-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 20px;
            min-width: 0;
        }

        .code-card-header > div:last-child {
            min-width: 0;
        }

        .code-card-icon {
            width: 48px;
            height: 48px;
            background: linear-gradient(145deg, #FFD700, #FFA500);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            box-shadow: 0 4px 15px rgba(255,215,0,0.3);
        }

        .code-card-title {
            color: white;
            font-size: 18px;
            font-weight: 600;
        }

        .code-card-subtitle {
            color: rgba(255,255,255,0.6);
            font-size: 13px;
        }

        .code-input-group {
            margin-bottom: 18px;
        }

        .code-input-label {
            display: block;
            color: rgba(255,255,255,0.8);
            font-size: 14px;
            margin-bottom: 8px;
            font-weight: 500;
        }

        .code-input {
            width: 100%;
            max-width: 100%;
            padding: 16px 20px;
            font-size: 22px;
            font-family: 'Courier New', monospace;
            letter-spacing: 4px;
            text-transform: uppercase;
            border: 2px solid rgba(255,255,255,0.2);
            border-radius: 14px;
            text-align: center;
            background: rgba(255,255,255,0.95);
            color: #333;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
            box-sizing: border-box;
        }

        .code-input:focus {
            outline: none;
            border-color: #FFD700;
            box-shadow: 0 0 0 4px rgba(255,215,0,0.2);
        }

        .code-input::placeholder {
            color: #aaa;
            letter-spacing: 2px;
        }

        .verify-btn {
            width: 100%;
            padding: 16px;
            font-size: 17px;
            font-weight: 600;
            background: linear-gradient(145deg, #FFD700, #FFA500);
            color: #333;
            border: none;
            border-radius: 14px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .verify-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(255,215,0,0.4);
        }

        .code-status {
            margin-top: 16px;
            padding: 14px 18px;
            border-radius: 12px;
            font-weight: 500;
            font-size: 14px;
            display: none;
            text-align: center;
        }

        .code-status.valid {
            background: rgba(76,175,80,0.2);
            border: 1px solid rgba(76,175,80,0.5);
            color: #A5D6A7;
            display: block;
        }

        .code-status.invalid {
            background: rgba(244,67,54,0.2);
            border: 1px solid rgba(244,67,54,0.5);
            color: #EF9A9A;
            display: block;
        }

        .spins-info {
            margin-top: 16px;
            padding: 14px;
            background: rgba(255,255,255,0.1);
            border-radius: 12px;
            display: none;
        }

        .spins-info.show {
            display: block;
        }

        .spins-info-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .spins-info-label {
            color: rgba(255,255,255,0.7);
            font-size: 14px;
        }

        .spins-info-value {
            color: #FFD700;
            font-size: 20px;
            font-weight: 700;
        }

        .wheel-section {
            display: flex;
            flex-direction: column;
            align-items: center;
            margin-top: 50px;
        }

        .wheel-container {
            position: relative;
            width: 380px;
            height: 380px;
        }

        .pointer {
            position: absolute;
            top: -5px;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 0;
            border-left: 20px solid transparent;
            border-right: 20px solid transparent;
            border-top: 40px solid white;
            z-index: 10;
            filter: drop-shadow(0 3px 8px rgba(0,0,0,0.4));
        }

        .wheel {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            position: relative;
            box-shadow: 
                0 0 0 10px rgba(255,255,255,0.3),
                0 0 0 14px rgba(139,0,0,0.8),
                0 0 40px rgba(0,0,0,0.4);
            overflow: hidden;
            transition: transform 5s cubic-bezier(0.17, 0.67, 0.12, 0.99);
            will-change: transform;
            backface-visibility: hidden;
            transform: translateZ(0);
        }

        .center-circle {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 80px;
            height: 80px;
            background: linear-gradient(145deg, #2a2a2a, #1a1a1a);
            border-radius: 50%;
            box-shadow: 0 4px 20px rgba(0,0,0,0.5);
            z-index: 5;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 36px;
        }

        .spin-btn {
            margin-top: 25px;
            padding: 18px 70px;
            font-size: 22px;
            font-weight: 700;
            color: white;
            background: linear-gradient(180deg, #FFD700 0%, #FFA500 50%, #FF8C00 100%);
            border: none;
            border-radius: 50px;
            cursor: pointer;
            box-shadow: 
                0 6px 0 #CC7000,
                0 8px 20px rgba(255,140,0,0.5),
                inset 0 2px 10px rgba(255,255,255,0.3);
            transition: all 0.2s ease;
            text-transform: uppercase;
            letter-spacing: 3px;
            position: relative;
            overflow: hidden;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }

        .spin-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
            transition: left 0.5s ease;
        }

        .spin-btn:hover:not(:disabled)::before {
            left: 100%;
        }

        .spin-btn:hover:not(:disabled) {
            transform: translateY(-3px) translateZ(0);
            box-shadow: 
                0 9px 0 #CC7000,
                0 12px 30px rgba(255,140,0,0.6),
                inset 0 2px 10px rgba(255,255,255,0.3);
        }

        .spin-btn:active:not(:disabled) {
            transform: translateY(2px) translateZ(0);
            box-shadow: 
                0 3px 0 #CC7000,
                0 5px 15px rgba(255,140,0,0.4),
                inset 0 2px 10px rgba(255,255,255,0.3);
        }

        .spin-btn:disabled {
            background: linear-gradient(180deg, #888 0%, #666 50%, #555 100%);
            cursor: not-allowed;
            box-shadow: 
                0 4px 0 #444,
                0 6px 15px rgba(0,0,0,0.3);
            text-shadow: none;
        }

        .history-section {
            margin-top: 30px;
            width: 100%;
        }

        .history-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
        }

        .history-card {
            background: rgba(0,0,0,0.25);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 20px;
            border: 1px solid rgba(255,255,255,0.1);
        }

        .history-card-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
        }

        .history-card h3 {
            color: #FFD700;
            font-size: 16px;
            font-weight: 600;
        }

        .clear-btn {
            padding: 6px 14px;
            font-size: 12px;
            background: rgba(255,255,255,0.1);
            border: 1px solid rgba(255,255,255,0.2);
            border-radius: 8px;
            color: rgba(255,255,255,0.6);
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .clear-btn:hover {
            background: rgba(244,67,54,0.3);
            border-color: #f44336;
            color: white;
        }

        .history-list {
            max-height: 220px;
            overflow-y: auto;
        }

        .history-list::-webkit-scrollbar {
            width: 5px;
        }

        .history-list::-webkit-scrollbar-track {
            background: rgba(255,255,255,0.1);
            border-radius: 3px;
        }

        .history-list::-webkit-scrollbar-thumb {
            background: rgba(255,215,0,0.5);
            border-radius: 3px;
        }

        .history-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 14px;
            background: rgba(255,255,255,0.05);
            border-radius: 12px;
            margin-bottom: 8px;
            border-left: 4px solid #4CAF50;
            content-visibility: auto;
            contain-intrinsic-size: auto 44px;
        }

        .history-item.miss {
            border-left-color: #f44336;
        }

        .history-item .prize-name {
            color: white;
            font-weight: 500;
            font-size: 14px;
            text-align: left;
            width: 100%;
        }

        .history-item > div {
            text-align: left;
            min-width: 0;
            flex: 1;
        }

        .history-item .prize-time {
            color: rgba(255,255,255,0.5);
            font-size: 11px;
            margin-top: 3px;
        }

        .code-history-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 14px;
            background: rgba(255,255,255,0.05);
            border-radius: 12px;
            margin-bottom: 8px;
            border-left: 4px solid #2196F3;
        }

        .code-history-item.invalid {
            border-left-color: #f44336;
        }

        .code-history-item .code-text {
            color: #81D4FA;
            font-family: 'Courier New', monospace;
            font-weight: bold;
            font-size: 14px;
            letter-spacing: 1px;
        }

        .code-history-item.invalid .code-text {
            color: #EF9A9A;
        }

        .code-history-item .code-time {
            color: rgba(255,255,255,0.5);
            font-size: 11px;
            margin-top: 3px;
        }

        .code-status-badge {
            font-size: 11px;
            padding: 4px 10px;
            border-radius: 8px;
            background: rgba(76,175,80,0.25);
            color: #A5D6A7;
            font-weight: 500;
        }

        .code-history-item.invalid .code-status-badge {
            background: rgba(244,67,54,0.25);
            color: #EF9A9A;
        }

        .empty-history {
            text-align: center;
            padding: 30px 20px;
            color: rgba(255,255,255,0.4);
            font-size: 14px;
        }

        .result-display {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.8);
            display: none;
            justify-content: center;
            align-items: center;
            z-index: 100;
            padding: 20px;
            box-sizing: border-box;
            overflow-y: auto;
        }

        .result-display.show {
            display: flex;
        }

        .result-content {
            background: linear-gradient(145deg, #1a1a2e 0%, #0f0f1a 100%);
            padding: 40px 50px;
            border-radius: 24px;
            text-align: center;
            box-shadow: 0 20px 60px rgba(0,0,0,0.5);
            border: 1px solid rgba(255,215,0,0.3);
            max-width: 420px;
            width: 90%;
            min-width: 0;
            position: relative;
            box-sizing: border-box;
        }

        .result-icon {
            font-size: 80px;
            margin-bottom: 15px;
            color: #FFD700;
        }

        .result-content h2 {
            color: #FFD700;
            font-size: 32px;
            margin-bottom: 8px;
            font-weight: 700;
        }

        .result-subtitle {
            color: rgba(255,255,255,0.6);
            font-size: 15px;
            margin-bottom: 25px;
        }

        .result-detail-list {
            width: 100%;
            margin-bottom: 28px;
        }

        .result-detail-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            background: rgba(255,255,255,0.05);
            border-radius: 10px;
            margin-bottom: 10px;
            border: 1px solid rgba(255,255,255,0.08);
        }

        .result-detail-row:last-child {
            margin-bottom: 0;
        }

        .result-detail-label {
            color: rgba(255,255,255,0.7);
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .result-detail-value {
            color: #fff;
            font-size: 15px;
            font-weight: 500;
            text-align: right;
        }

        .result-detail-value.result-code {
            color: #FFE082;
            font-family: 'Courier New', monospace;
            font-weight: 600;
            letter-spacing: 1px;
            font-size: 16px;
        }

        .result-prize-row {
            background: linear-gradient(135deg, rgba(255,215,0,0.15) 0%, rgba(255,140,0,0.1) 100%);
            border-color: rgba(255,215,0,0.4);
            padding: 14px 18px;
        }

        .result-detail-value.result-prize {
            color: #FFD700;
            font-size: 22px;
            font-weight: 700;
        }

        .result-content button {
            padding: 16px 60px;
            font-size: 16px;
            background: linear-gradient(145deg, #FFD700, #FFA500);
            border: none;
            border-radius: 50px;
            color: #1a0f2e;
            cursor: pointer;
            font-weight: 700;
            transition: all 0.2s ease;
            box-shadow: 0 4px 15px rgba(255,215,0,0.3);
            text-transform: uppercase;
            letter-spacing: 2px;
        }

        .result-content button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255,215,0,0.4);
        }

        .result-content button:active {
            transform: translateY(0);
        }

        .confetti {
            position: fixed;
            pointer-events: none;
            z-index: 101;
        }

        .footer-section {
            margin-top: 30px;
            padding: 30px 20px;
            background: linear-gradient(180deg, rgba(0, 81, 255, 0.747) 0%, rgba(4, 146, 172, 0.884) 100%);
            border-top: 3px solid rgba(0, 255, 200, 0.4);
            position: relative;
        }

        .footer-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255,215,0,0.6), transparent);
        }

        .footer-title {
            text-align: center;
            color: #FFD700;
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 25px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            text-shadow: 0 2px 8px rgba(0,0,0,0.4);
        }

        .prizes-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
            padding: 20px;
            background: rgba(0,0,0,0.2);
            border-radius: 16px;
            border: 1px solid rgba(255,255,255,0.1);
        }

        .prize-item {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 12px 20px;
            background: rgba(255,255,255,0.08);
            border-radius: 25px;
            min-width: auto;
            transition: all 0.3s ease;
            border: 1px solid rgba(255,255,255,0.1);
        }

        .prize-item:hover {
            background: rgba(255,255,255,0.15);
            transform: translateY(-2px);
        }

        .prize-dot {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            box-shadow: 0 2px 8px rgba(0,0,0,0.4);
            border: 2px solid rgba(255,255,255,0.5);
        }

        .prize-name {
            color: white;
            font-size: 14px;
            font-weight: 500;
        }

        .prizes-grid .prize-name {
            text-align: center;
        }

        .footer-bottom {
            margin-top: 25px;
            text-align: center;
            padding: 30px 20px;
        }

        .footer-copyright {
            color: rgba(255,255,255,0.8);
            font-size: 14px;
            margin-bottom: 20px;
            line-height: 1.7;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 15px;
            flex-wrap: wrap;
        }

        .footer-link {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 25px;
            border-radius: 8px;
            color: white;
            text-decoration: none;
            font-size: 15px;
            font-weight: 500;
            transition: all 0.3s ease;
            border: none;
        }

        .footer-link:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 20px rgba(0,0,0,0.3);
        }

        .footer-link.facebook {
            background: #1876f2d0;
            border-radius: 20px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .footer-link.facebook svg {
            width: 18px;
            height: 18px;
        }

        .footer-link.line {
            background: #00b900d5;
            border-radius: 20px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .footer-link.line i {
            font-size: 18px;
        }

        .footer-link.admin {
            background: rgba(255,215,0,0.25);
            border: 2px solid rgba(255,215,0,0.6);
            color: #FFD700;
            border-radius: 20px;
        }

        .footer-link.admin:hover {
            background: rgba(255,215,0,0.35);
            border-color: #FFD700;
        }

        /* Tablet (iPad แนวตั้ง/แนวนอน และจอเล็ก) */
        @media (max-width: 900px) {
            .page-container {
                padding: 0 20px;
            }

            .top-section {
                flex-direction: column;
                align-items: center;
                padding-top: 20px;
                gap: 24px;
            }

            .code-card {
                max-width: 100%;
                width: 100%;
                margin-top: 0;
                margin-left: 0;
                padding: 24px 20px;
            }

            .wheel-section {
                margin-top: 0;
            }

            .result-display {
                padding: 16px;
            }

            .result-content {
                width: 90%;
                max-width: 440px;
                padding: 40px 36px;
            }
        }

        /* iPad แนวนอน / จอกลาง */
        @media (max-width: 900px) and (min-width: 501px) {
            .code-card {
                max-width: 420px;
            }
        }

        /* Mobile */
        @media (max-width: 500px) {
            html, body {
                height: 100%;
                min-height: 100vh;
                overflow-y: auto;
            }

            body {
                padding: 10px;
                background-attachment: scroll;
                background-size: cover !important;
                background-position: center top;
                display: flex;
                flex-direction: column;
            }

            body::before {
                background: linear-gradient(135deg, rgba(0, 255, 255, 0.5) 0%, rgba(0, 17, 255, 0.55) 100%);
            }

            .page-container {
                padding: 0 12px;
                flex: 1;
                min-height: 100vh;
            }

            .top-section {
                padding-top: 15px;
                gap: 20px;
            }

            .wheel-container {
                width: 320px;
                height: 320px;
            }

            .center-circle {
                width: 60px;
                height: 60px;
                font-size: 26px;
            }

            .code-card {
                padding: 20px 16px;
                margin-top: 0;
                margin-left: 0;
            }

            .code-card-title {
                font-size: 16px;
            }

            .code-card-subtitle {
                font-size: 12px;
            }

            .code-input {
                font-size: 18px;
                padding: 14px 12px;
                letter-spacing: 3px;
            }

            .spin-btn {
                padding: 14px 50px;
                font-size: 18px;
                letter-spacing: 2px;
            }

            .result-display {
                padding: 12px;
                align-items: flex-start;
                padding-top: 24px;
            }

            .result-content {
                width: 100%;
                max-width: 100%;
                padding: 35px 25px;
                margin: auto;
            }

            .result-icon {
                font-size: 50px;
            }

            .result-content h2 {
                font-size: 26px;
            }

            .result-detail-row {
                padding: 10px 14px;
                gap: 8px;
            }

            .result-detail-label {
                font-size: 13px;
            }

            .result-detail-value {
                font-size: 13px;
            }

            .result-detail-value.result-prize {
                font-size: 17px;
            }

            .result-content button {
                padding: 14px 45px;
                font-size: 16px;
            }

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

            .prizes-grid {
                padding: 15px;
                gap: 8px;
            }

            .prize-item {
                padding: 8px 14px;
            }

            .prize-dot {
                width: 14px;
                height: 14px;
            }

            .prize-name {
                font-size: 12px;
            }

            .footer-title {
                font-size: 16px;
            }

            .footer-copyright {
                font-size: 12px;
            }

            .footer-link {
                padding: 10px 18px;
                font-size: 13px;
            }

            .wheel-section {
                margin-top: 15px;
            }
        }

        /* Small Mobile */
        @media (max-width: 360px) {
            .page-container {
                padding: 0 10px;
            }

            .wheel-container {
                width: 280px;
                height: 280px;
            }

            .center-circle {
                width: 50px;
                height: 50px;
                font-size: 22px;
            }

            .code-card {
                padding: 18px 14px;
            }

            .code-card-icon {
                width: 36px;
                height: 36px;
                font-size: 18px;
            }

            .code-card-title {
                font-size: 15px;
            }

            .code-card-subtitle {
                font-size: 11px;
            }

            .code-input {
                font-size: 16px;
                padding: 12px 10px;
                letter-spacing: 2px;
            }

            .spin-btn {
                padding: 12px 40px;
                font-size: 16px;
                letter-spacing: 1px;
            }

            .prizes-grid {
                gap: 5px;
                padding: 12px;
            }

            .prize-item {
                padding: 6px 10px;
            }

            .prize-dot {
                width: 12px;
                height: 12px;
            }

            .prize-name {
                font-size: 11px;
            }

            .footer-title {
                font-size: 14px;
            }

            .footer-links {
                gap: 10px;
            }

            .footer-link {
                padding: 8px 15px;
                font-size: 12px;
            }

            .result-display {
                padding: 10px;
                padding-top: 20px;
            }

            .result-content {
                padding: 28px 18px;
                border-radius: 20px;
            }

            .result-icon {
                font-size: 42px;
            }

            .result-content h2 {
                font-size: 22px;
            }

            .result-detail-row {
                padding: 8px 12px;
                gap: 6px;
            }

            .result-detail-label {
                font-size: 12px;
            }

            .result-detail-value {
                font-size: 12px;
            }

            .result-detail-value.result-prize {
                font-size: 15px;
            }

            .result-content button {
                padding: 12px 36px;
                font-size: 14px;
            }
        }