:root {
            --bg-primary: #09090c;
            --bg-secondary: #121218;
            --bg-tertiary: #1a1a24;
            --bg-card: #0e0e14;
            --border: #2a2a38;
            --border-light: #3a3a4a;
            --text-primary: #ffffff;
            --text-secondary: #a0a0b2;
            --text-muted: #6a6a7a;
            --accent: #6366f1;
            --accent-hover: #818cf8;
            --accent-glow: rgba(99, 102, 241, 0.4);
            --gradient-1: #00d4ff;
            --gradient-2: #a855f7;
            --success: #22c55e;
            --error: #ef4444;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: #000000;
            color: var(--text-primary);
            line-height: 1.6;
            position: relative;
            overflow-x: hidden;
        }

        /* Hero + Promo Wrapper for beat effect */
        .hero-promo-wrapper {
            position: relative;
            overflow: hidden;
        }

.beat-layer {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 20px;
            height: 11px;
            background: transparent;
            opacity: 0;
            pointer-events: none;
            z-index: 0;
            will-change: transform, opacity;
        }

        .beat-inner {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: transparent;
        }

        .beat-light {
            position: absolute;
            pointer-events: none;
            will-change: transform, opacity;
        }

.beat-light-top {
            top: 0;
            right: 0;
            width: 70%;
            height: 70%;
            background: radial-gradient(circle at 100% 0%, rgba(100, 140, 255, 1) 0%, rgba(74, 107, 255, 0.6) 20%, transparent 55%);
            transform-origin: top right;
            animation: lightPulse 16s ease-in-out infinite;
        }

        .beat-light-bottom {
            bottom: 0;
            left: 0;
            width: 80%;
            height: 80%;
            background: radial-gradient(circle at 0% 100%, rgba(120, 160, 255, 1) 0%, rgba(90, 120, 255, 0.7) 15%, transparent 50%);
            transform-origin: bottom left;
            animation: lightPulseReverse 16s ease-in-out infinite;
        }

        @keyframes lightPulse {
            0%, 100% {
                transform: scale(0.15);
                opacity: 0.2;
            }
            25% {
                transform: scale(1.2);
                opacity: 0.7;
            }
            50% {
                transform: scale(0.15);
                opacity: 0.2;
            }
            75% {
                transform: scale(1.3);
                opacity: 0.8;
            }
        }

        @keyframes lightPulseReverse {
            0%, 50% {
                transform: scale(0.15);
                opacity: 0.2;
            }
            25% {
                transform: scale(0.15);
                opacity: 0.2;
            }
            75% {
                transform: scale(1.4);
                opacity: 0.9;
            }
            100% {
                transform: scale(0.15);
                opacity: 0.2;
            }
        }

        .beat-light-bottom {
            bottom: 0;
            left: 0;
            width: 60%;
            height: 60%;
            background: radial-gradient(circle at 0% 100%, rgba(120, 160, 255, 1) 0%, rgba(90, 120, 255, 0.7) 20%, transparent 60%);
            transform-origin: bottom left;
            animation: lightPulseReverse 16s ease-in-out infinite;
        }

        .beat-layer-1 {
            width: 20px;
            height: 11px;
            animation: beatWave 16s cubic-bezier(0.4, 0, 0.2, 1) 0s infinite;
        }
        .beat-layer-2 {
            width: 30px;
            height: 17px;
            animation: beatWave 16s cubic-bezier(0.4, 0, 0.2, 1) -2.67s infinite;
        }
        .beat-layer-3 {
            width: 40px;
            height: 22px;
            animation: beatWave 16s cubic-bezier(0.4, 0, 0.2, 1) -5.33s infinite;
        }
        .beat-layer-4 {
            width: 55px;
            height: 31px;
            animation: beatWave 16s cubic-bezier(0.4, 0, 0.2, 1) -8s infinite;
        }
        .beat-layer-5 {
            width: 70px;
            height: 39px;
            animation: beatWave 16s cubic-bezier(0.4, 0, 0.2, 1) -10.67s infinite;
        }
        .beat-layer-6 {
            width: 85px;
            height: 48px;
            animation: beatWave 16s cubic-bezier(0.4, 0, 0.2, 1) -13.33s infinite;
        }

        @keyframes beatWave {
            0% {
                width: 20px;
                height: 11px;
                opacity: 0;
                box-shadow: none;
            }
            4% {
                width: 28vmax;
                height: 16vmax;
                opacity: 0.05;
            }
            15% {
                width: 35vmax;
                height: 20vmax;
                opacity: 0.05;
            }
            30% {
                width: 48vmax;
                height: 27vmax;
                opacity: 0.08;
            }
            45% {
                width: 60vmax;
                height: 34vmax;
                opacity: 0.1;
            }
            60% {
                width: 72vmax;
                height: 40vmax;
                opacity: 0.1;
            }
            75% {
                width: 85vmax;
                height: 48vmax;
                opacity: 0.08;
            }
            90% {
                width: 95vmax;
                height: 53vmax;
                opacity: 0.05;
            }
            100% {
                width: 100vmax;
                height: 56vmax;
                opacity: 0;
            }
        }

        @keyframes lightPulse {
            0%, 100% {
                transform: scale(0.2);
                opacity: 0.15;
            }
            25% {
                transform: scale(0.9);
                opacity: 0.5;
            }
            50% {
                transform: scale(0.2);
                opacity: 0.15;
            }
            75% {
                transform: scale(1.0);
                opacity: 0.6;
            }
        }

        @keyframes lightPulseReverse {
            0%, 50% {
                transform: scale(0.2);
                opacity: 0.15;
            }
            25% {
                transform: scale(0.2);
                opacity: 0.15;
            }
            75% {
                transform: scale(1.0);
                opacity: 0.6;
            }
            100% {
                transform: scale(0.2);
                opacity: 0.15;
            }
        }

        a { text-decoration: none; color: inherit; }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header */
        header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 40px;
            background: #000000;
            border-bottom: 1px solid var(--border);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            letter-spacing: -0.5px;
            cursor: pointer;
        }

        .logo-icon-img {
            width: 36px;
            height: 36px;
        }

        .logo-text {
            height: 24px;
        }

        .hero-logo {
            width: 80px;
            height: 80px;
            margin-bottom: 24px;
        }

        .yc-logo {
            height: 20px;
            display: block;
            margin-top: 8px;
        }

        .header-nav {
            display: flex;
            align-items: center;
            gap: 24px;
        }

        .header-btn {
            padding: 10px 20px;
            font-size: 14px;
            font-weight: 500;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .header-btn-login {
            background: transparent;
            color: var(--text-secondary);
            border: none;
            border-radius: 20px;
        }

        .header-btn-login:hover {
            color: var(--text-primary);
            background: var(--bg-tertiary);
        }

        .header-btn-signup {
            background: #526FFF;
            color: var(--text-primary);
            border: none;
            border-radius: 20px;
        }

        .header-btn-signup:hover {
            background: #6B85FF;
        }

        /* Hero Section */
        .hero {
            padding: 180px 40px 100px;
            text-align: center;
            position: relative;
            overflow: hidden;
            background: transparent;
        }

        .hero-content {
            position: relative;
            z-index: 1;
        }

        .hero-title {
            font-size: 72px;
            font-weight: 700;
            letter-spacing: -2px;
            margin-bottom: 16px;
            background: linear-gradient(135deg, #fff 0%, #b0b0c0 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: 20px;
            color: var(--text-secondary);
            margin-bottom: 40px;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            background: linear-gradient(135deg, var(--accent) 0%, #7c3aed 100%);
            color: white;
            font-size: 13px;
            font-weight: 600;
            border: none;
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-bottom: 24px;
            box-shadow: 0 4px 20px var(--accent-glow);
        }

        .hero-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 40px var(--accent-glow);
        }

        .hero-backed {
            font-size: 14px;
            color: var(--text-muted);
            text-align: center;
        }

        .yc-logo {
            height: 20px;
            display: block;
            margin: 12px auto 0;
        }

        /* Promo Video Placeholder */
        .promo-section {
            padding: 60px 40px;
            display: flex;
            flex-direction: column;
            align-items: center;
            position: relative;
            overflow: hidden;
            background: transparent;
        }

        .promo-container {
            width: 100%;
            max-width: 1204px;
            height: auto;
            aspect-ratio: 16/9;
            border: 1px solid var(--border);
            border-radius: 4px;
            position: relative;
            overflow: hidden;
            margin: 0 auto 32px;
            z-index: 1;
        }

        .promo-video {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }

        @media (max-width: 768px) {
            .promo-container {
                aspect-ratio: 16/10;
            }
        }

        @media (max-width: 480px) {
            .promo-container {
                aspect-ratio: 4/3;
            }
        }

        .promo-title {
            text-align: center;
            font-size: 52px;
            font-weight: 700;
            color: white;
            margin-top: 48px;
            margin-bottom: 12px;
        }

        .promo-title-line {
            display: block;
        }

        .promo-subtitle {
            text-align: center;
            font-size: 18px;
            color: var(--text-muted);
            margin-bottom: 48px;
        }

        /* Feature Tabs */
        .features-section {
            padding: 40px;
            background: var(--bg-primary);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 0;
            margin-bottom: 32px;
        }

        .feature-tab {
            padding: 24px 32px;
            background: transparent;
            border: none;
            border-radius: 0;
            text-align: left;
            cursor: pointer;
            transition: all 0.3s ease;
            color: var(--text-secondary);
            position: relative;
            margin-bottom: 8px;
        }

        .feature-tab:hover {
            color: var(--text-primary);
        }

        .feature-tab.active {
            background: transparent;
            border-color: transparent;
            color: var(--text-primary);
        }

        .feature-tab-title {
            font-size: 22px;
            font-weight: 600;
            display: block;
            line-height: 1.3;
            white-space: nowrap;
        }

        .feature-tab-desc {
            font-size: 16px;
            color: var(--text-muted);
            display: block;
            margin-top: 4px;
            white-space: nowrap;
        }

        .feature-tab.active .feature-tab-desc {
            color: var(--text-secondary);
        }

        .feature-tab-indicator {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: #ffffff;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .feature-tab.active .feature-tab-indicator {
            opacity: 1;
        }

        /* Engine Section - New Box Layout */
        .engine-section {
            padding: 60px 40px 80px;
            background: linear-gradient(to bottom, #000101, #101114);
        }

        .engine-section.hidden {
            display: none;
        }

        .engine-header {
            max-width: 1204px;
            margin: 0 auto 20px;
            text-align: center;
        }

        .engine-header span {
            display: block;
            color: var(--text-primary);
            font-weight: 700;
            font-size: 28px;
            letter-spacing: -0.5px;
        }

        .engine-header-line {
            margin-top: 0;
        }

        .engine-header-subtitle {
            font-size: 14px;
            color: var(--text-secondary);
            font-weight: 400;
            margin-top: 8px;
        }

        .engine-features-grid {
            display: flex;
            justify-content: center;
            gap: 48px;
            margin-top: 32px;
            padding: 0;
            list-style: none;
        }

        .engine-features-grid .feature-tab {
            position: relative;
            padding: 0;
            background: transparent;
            border: none;
            border-radius: 0;
            cursor: pointer;
            min-width: 180px;
            text-align: center;
        }

        .engine-features-grid .feature-tab-line {
            height: 3px;
            width: 100%;
            background: var(--border);
            margin-bottom: 12px;
            transition: background 0.2s ease;
        }

        .engine-features-grid .feature-tab.active .feature-tab-line {
            background: #ffffff;
        }

        .engine-features-grid .feature-tab-title {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-muted);
            transition: color 0.2s ease;
        }

        .engine-features-grid .feature-tab.active .feature-tab-title {
            color: var(--text-primary);
        }

        .engine-features-grid .feature-tab-desc {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 6px;
            display: none;
        }

        .engine-features-grid .feature-tab.active .feature-tab-desc {
            color: var(--text-secondary);
            display: block;
        }

        .engine-features-grid .feature-tab-title {
            font-size: 14px;
            color: var(--text-primary);
            font-weight: 500;
        }

        .engine-features-grid .feature-tab-desc {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        .engine-layout {
            display: grid;
            grid-template-columns: 280px 1fr;
            gap: 2px;
            max-width: 1204px;
            height: 480px;
            margin: 0 auto;
            align-items: start;
        }

        @media (max-width: 900px) {
            .engine-layout {
                display: grid;
                grid-template-columns: 180px 1fr;
                gap: 2px;
                height: 360px;
            }
            .engine-media-container {
                padding: 0 10px;
            }
        }

        .engine-list-box {
            display: flex;
            flex-direction: column;
            gap: 0;
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 4px;
            overflow: hidden;
            height: 100%;
        }

        .engine-list-item {
            padding: 12px 16px;
            background: var(--bg-tertiary);
            border-bottom: 1px solid var(--border);
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .engine-list-item:last-child {
            border-bottom: none;
        }

        .engine-list-item:hover {
            background: var(--bg-card);
        }

        .engine-list-item.active {
            background: var(--bg-card);
            flex: 1;
        }

        .engine-list-title {
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 16px;
            font-weight: 600;
            position: relative;
        }

        .engine-list-title span {
            text-align: center;
            flex: 1;
        }

        .engine-chevron {
            position: absolute;
            right: 0;
            transition: transform 0.3s ease;
        }
            color: var(--text-muted);
        }

        .engine-list-item.active .engine-chevron {
            transform: rotate(180deg);
            color: var(--accent);
        }

        .engine-list-desc {
            font-size: 13px;
            color: var(--text-secondary);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, margin-top 0.3s ease, opacity 0.3s ease;
            opacity: 0;
            line-height: 1.5;
        }

        .engine-list-item.active .engine-list-desc {
            max-height: 80px;
            margin-top: 12px;
            opacity: 1;
        }

        .engine-media-container {
            width: 100%;
            height: 100%;
            overflow: hidden;
            position: relative;
            padding: 0 8px;
        }

        .engine-media-track {
            display: flex;
            width: 400%;
            height: 100%;
            transition: transform 0.5s cubic-bezier(0.25, 0.1, 0.25, 1);
        }

        .engine-media-item {
            flex: 0 0 25%;
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0 40px;
            box-sizing: border-box;
            transition: opacity 0.3s ease, transform 0.3s ease;
        }

        .engine-media {
            width: 100%;
            height: calc(100% - 24px);
            object-fit: cover;
            border-radius: 4px;
            box-shadow: 0 0 0 0 transparent;
            transition: box-shadow 0.3s ease;
        }

        .engine-video {
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-card) 100%);
            border: 1px solid var(--border);
            border-radius: 4px;
            object-fit: cover;
        }

        

        /* Engine Section - New Box Layout */
        .engine-section {
            padding: 80px 40px;
        }

        .engine-section.hidden {
            display: none;
        }

        .engine-carousel-container {
            width: 100%;
            overflow: hidden;
            position: relative;
        }

        .engine-carousel-track {
            display: flex;
            width: 400%;
            transition: transform 0.5s cubic-bezier(0.25, 0.1, 0.25, 1);
        }

        .engine-carousel-item {
            flex: 0 0 25%;
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0 60px;
            box-sizing: border-box;
        }

        .engine-media-full {
            width: 100%;
            max-width: 1204px;
            height: auto;
            object-fit: cover;
            border-radius: 4px;
        }

        @media (max-width: 900px) {
            .engine-media-full {
                max-width: 100%;
            }
        }

        /* Engine box layout - flush with video */

        .engine-list-item:last-child {
            border-bottom: none;
        }

        .engine-list-item:hover {
            background: var(--bg-card);
        }

        .engine-list-item.active {
            background: var(--bg-card);
        }

        .engine-list-desc {
            font-size: 13px;
            color: var(--text-secondary);
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, margin-top 0.3s ease;
            line-height: 1.5;
            text-align: center;
            padding: 0 8px;
        }

        .engine-list-item.active .engine-list-desc {
            max-height: 100px;
            margin-top: 12px;
        }

        .engine-image-box {
            position: sticky;
            top: 100px;
        }

        .engine-video {
            width: 100%;
            aspect-ratio: 16/10;
            background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-card) 100%);
            border: 1px solid var(--border);
            border-radius: 4px;
            object-fit: cover;
        }

        /* Architecture Section */
        .arch-section {
            padding: 80px 40px;
        }

        .arch-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .arch-header h2 {
            font-size: 40px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .arch-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        @media (max-width: 768px) {
            .arch-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }
        .rewards-layout {
            display: flex;
            flex-direction: column;
            width: 100%;
            max-width: 1604px;
            min-height: 800px;
            margin: 0 auto;
            background: linear-gradient(90deg, #030407 0%, #1A1E2E 100%);
            border-radius: 8px;
            overflow: visible;
        }

        .rewards-header {
            text-align: center;
            margin: 80px 0 48px;
        }

        .rewards-header h2 {
            font-size: 56px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -1px;
            margin-bottom: 12px;
        }

        .rewards-header p {
            font-size: 20px;
            color: var(--text-muted);
        }

        @media (max-width: 768px) {
        .rewards-header {
            text-align: center;
            margin: 48px 0 32px;
        }

        .rewards-header h2 {
            font-size: 40px;
            font-weight: 700;
            color: white;
            margin-bottom: 8px;
        }

        .rewards-header p {
            font-size: 18px;
            color: var(--text-muted);
        }

        @media (max-width: 768px) {
            .rewards-header {
                margin: 32px 0 24px;
            }
            .rewards-header h2 {
                font-size: 28px;
            }
            .rewards-header p {
                font-size: 14px;
            }
        }

        .rewards-layout {
                min-height: auto;
            }
            .rewards-row {
                flex-direction: column;
                min-height: 300px;
            }
            .rewards-row:first-child .rewards-box:first-child,
            .rewards-row:first-child .rewards-box:last-child,
            .rewards-row:last-child .rewards-box:first-child,
            .rewards-row:last-child .rewards-box:last-child {
                flex: 1;
                border-right: none;
                border-left: none;
                border-bottom: 1px solid rgba(255,255,255,0.08);
            }
            .rewards-row:last-child .rewards-box:last-child {
                border-bottom: none;
            }
        }

        .rewards-row {
            display: flex;
            width: 100%;
            flex: 1;
            min-height: 400px;
            position: relative;
        }

        .rewards-row:first-child {
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }

        .rewards-row:last-child {
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }

        .rewards-row:last-child .rewards-box:first-child {
            border-right: 1px solid rgba(255,255,255,0.08);
        }

        .rewards-row:last-child .rewards-box:last-child {
            border-right: none;
        }

        :root {
            --rewards-border: rgba(255,255,255,0.08);
        }

        .rewards-row:first-child .rewards-box:first-child {
            flex: 3;
        }

        .rewards-row:first-child .rewards-box:last-child {
            flex: 2;
        }

        .rewards-row:last-child .rewards-box:first-child {
            flex: 2;
        }

        .rewards-row:last-child .rewards-box:last-child {
            flex: 3;
        }

        .rewards-box {
            padding: 32px;
            display: flex;
            flex-direction: column;
            justify-content: flex-start;
            border-right: 1px solid rgba(255,255,255,0.08);
            border-left: 1px solid rgba(255,255,255,0.08);
            height: 100%;
            overflow: hidden;
            box-sizing: border-box;
        }

        .rewards-row:first-child .rewards-box:first-child {
            border-left: none;
        }

        .rewards-row:last-child .rewards-box:last-child {
            border-right: none;
        }

        .rewards-box > * {
            max-width: 100%;
            box-sizing: border-box;
        }

        .rewards-box h3 {
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .rewards-box p {
            font-size: 18px;
            color: var(--text-secondary);
            margin-bottom: 24px;
        }

        .rewards-box .reward-img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            border-radius: 4px;
        }

        .rewards-box .reward-img-small {
            width: 80%;
            height: 80%;
            max-width: 80%;
            max-height: 80%;
            margin: 0 auto;
            object-fit: contain;
        }

.rewards-box:last-child {
            border-right: none;
        }

        .rewards-box h3 {
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .rewards-box p {
            font-size: 18px;
            color: var(--text-secondary);
            margin-bottom: 24px;
        }

        .reward-img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            border-radius: 4px;
        }

        .reward-img-small {
            width: 80%;
            height: 80%;
            max-width: 80%;
            max-height: 80%;
            margin: 0 auto;
            display: block;
            object-fit: contain;
        }

        .rewards-box h3 {
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .rewards-box p {
            font-size: 18px;
            color: var(--text-secondary);
            margin-bottom: 24px;
        }
        }

        .rewards-box h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .rewards-box p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }

        .reward-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 4px;
            flex-grow: 1;
        }

        .rewards-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .reward-card {
            position: relative;
            padding: 20px 18px;
            background: var(--bg-tertiary);
            border-radius: 8px;
            text-align: center;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .reward-card::before {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: 8px;
            padding: 2px;
            background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .reward-card:hover::before {
            opacity: 1;
        }

        .reward-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 32px rgba(99, 102, 241, 0.2);
        }

        .reward-img {
            width: 100%;
            height: 80px;
            object-fit: contain;
            margin-bottom: 16px;
            border-radius: 4px;
        }

        .reward-card h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .reward-card p {
            font-size: 13px;
            color: var(--text-secondary);
        }

        /* Architecture Section */
        .arch-section {
            padding: 80px 40px;
        }

        .arch-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .arch-header h2 {
            font-size: 40px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .arch-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        @media (max-width: 768px) {
            .arch-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }

        .arch-card {
            position: relative;
            padding: 32px;
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 8px;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .arch-card::before {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: 8px;
            padding: 2px;
            background: linear-gradient(135deg, var(--accent), #a855f7);
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .arch-card:hover::before {
            opacity: 1;
        }

        .arch-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(99, 102, 241, 0.15);
        }

        .arch-card h3 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
            color: white;
        }

        .arch-separator {
            height: 1px;
            background: rgba(255,255,255,0.1);
            margin-bottom: 16px;
        }

        .arch-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 20px;
        }

        .arch-img {
            width: 100%;
            max-width: 527px;
            height: auto;
            aspect-ratio: 527/273;
            object-fit: cover;
            margin: 24px auto 0;
            display: block;
            border-radius: 4px;
        }

        .arch-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .arch-icon {
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

/* FAQ Section - Left Label with Box */
        .faq-section {
            padding: 80px 40px;
            background: var(--bg-secondary);
        }

        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-row {
            display: flex;
            align-items: flex-start;
            gap: 80px;
        }

        .faq-label {
            font-size: 72px;
            font-weight: 700;
            color: white;
            letter-spacing: 2px;
            min-width: 120px;
            padding-top: 20px;
        }

        .faq-list {
            flex: 1;
            background: var(--bg-tertiary);
            border: 1px solid var(--border);
            border-radius: 8px;
            overflow: hidden;
            padding: 8px;
        }

        .faq-item {
            border-bottom: 1px solid var(--border);
        }

        .faq-item:last-child {
            border-bottom: none;
        }

.faq-question {
            padding: 20px 32px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            cursor: pointer;
            font-weight: 500;
            font-size: 18px;
            color: white;
            transition: background 0.3s ease;
        }

        .faq-question:hover {
            background: var(--bg-card);
        }

        .faq-icon {
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.3s ease;
            color: white;
            flex-shrink: 0;
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
            color: var(--accent);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            padding: 0 32px;
            background: var(--bg-secondary);
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 16px 32px;
        }

        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-label {
            font-size: 72px;
            font-weight: 700;
            color: white;
            letter-spacing: 2px;
            min-width: 120px;
            padding-top: 20px;
        }

        .faq-question:hover {
            background: var(--bg-card);
        }

        .faq-icon {
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.3s ease;
            color: white;
            flex-shrink: 0;
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
            color: white;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            font-size: 15px;
            color: white;
            line-height: 1.6;
            padding: 0 32px;
            background: var(--bg-secondary);
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 12px 20px;
        }

        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-label {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-muted);
            letter-spacing: 2px;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .faq-label::after {
            content: '';
            flex: 1;
            height: 1px;
            background: var(--border);
        }

        .faq-list {
            display: flex;
            flex-direction: column;
        }

        .faq-item {
            border-bottom: 1px solid var(--border);
            transition: all 0.3s ease;
        }

        .faq-item:first-child {
            border-top: 1px solid var(--border);
        }

        .faq-question:hover {
            color: var(--accent);
        }

        .faq-icon {
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            padding: 0 32px;
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 16px 32px;
        }

        /* CTA Section */
        .cta-section {
            position: relative;
            padding: 100px 40px;
            background: #000000;
            text-align: center;
            overflow: hidden;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -200px;
            right: -100px;
            width: 600px;
            height: 400px;
            background: radial-gradient(ellipse at 80% 80%, rgba(100, 130, 220, 0.5) 0%, rgba(75, 100, 180, 0.3) 30%, transparent 60%);
            pointer-events: none;
        }

        .cta-title {
            font-size: 36px;
            font-weight: 600;
            color: #ffffff;
            margin-bottom: 32px;
            position: relative;
            z-index: 1;
        }

        .cta-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 24px;
            background: linear-gradient(135deg, var(--accent) 0%, #7c3aed 100%);
            color: #000000;
            font-size: 13px;
            font-weight: 600;
            border: none;
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 20px var(--accent-glow);
            position: relative;
            z-index: 1;
        }

        .cta-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 40px var(--accent-glow);
        }

        /* Footer */
        footer {
            margin-top: auto;
            flex-shrink: 0;
            width: 100%;
            background: #18181A;
            position: relative;
            z-index: 1;
        }

        .footer-main {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 48px;
            background: #18181A;
            width: 100%;
        }

        .footer-left {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .footer-logo {
            height: 24px;
            width: auto;
        }

        .footer-links {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .footer-link {
            color: #FFFFFF;
            font-size: 15px;
            transition: color 0.3s ease;
            text-decoration: none;
        }

        .footer-link:hover {
            color: #999999;
        }

        .footer-icon-link {
            color: #FFFFFF;
            display: flex;
            align-items: center;
            transition: color 0.3s ease;
        }

        .footer-icon-link:hover {
            color: #999999;
        }

        .footer-copy {
            font-size: 14px;
            color: #616473;
        }

        .footer-divider {
            height: 1px;
            background: #2A2A2E;
            width: 100%;
        }

        .footer-bottom {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 16px;
            padding: 16px 48px;
            background: #18181A;
            width: 100%;
        }

        .footer-bottom-link {
            color: #616473;
            font-size: 13px;
            transition: color 0.3s ease;
            text-decoration: none;
        }

        .footer-bottom-link:hover {
            color: #999999;
        }

        .footer-divider-dot {
            color: #3A3A3E;
        }

        /* Wallet Modal */
.signup-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.85);
            backdrop-filter: blur(8px);
            z-index: 1000;
            align-items: center;
            justify-content: center;
        }

        .signup-modal.active {
            display: flex;
        }

        .signup-container {
            background: #18181A;
            border: 1px solid #282932;
            border-radius: 4px;
            padding: 20px;
            width: 340px;
            min-height: 380px;
            position: relative;
            display: flex;
            flex-direction: column;
        }

        .signup-loading-overlay {
            position: absolute;
            top: 12px;
            left: 50%;
            transform: translateX(-50%);
            width: 308px;
            height: 32px;
            background: #18181A;
            border: 1px solid #282932;
            border-radius: 4px;
            display: none;
            align-items: center;
            justify-content: center;
            gap: 12px;
            z-index: 100;
            opacity: 0;
            animation: dropdownFadeIn 0.3s ease forwards;
        }

        @keyframes dropdownFadeIn {
            0% {
                opacity: 0;
                transform: translateX(-50%) translateY(-10px);
            }
            100% {
                opacity: 1;
                transform: translateX(-50%) translateY(0);
            }
        }

        .signup-loading-overlay.hiding {
            animation: dropdownFadeOut 0.2s ease forwards;
        }

        @keyframes dropdownFadeOut {
            0% {
                opacity: 1;
                transform: translateX(-50%) translateY(0);
            }
            100% {
                opacity: 0;
                transform: translateX(-50%) translateY(-10px);
            }
        }

        .signup-loading-overlay span {
            font-size: 14px;
            color: #D4D4D8;
            font-weight: 500;
        }

        .signup-loading-spinner {
            width: 18px;
            height: 18px;
            position: relative;
        }

        .signup-loading-spinner span {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 3px;
            height: 5px;
            background: white;
            border-radius: 50%;
            transform-origin: center;
        }

        .signup-loading-spinner span:nth-child(1) { transform: translate(-50%, -50%) rotate(0deg) translateY(-6px); }
        .signup-loading-spinner span:nth-child(2) { transform: translate(-50%, -50%) rotate(45deg) translateY(-6px); }
        .signup-loading-spinner span:nth-child(3) { transform: translate(-50%, -50%) rotate(90deg) translateY(-6px); }
        .signup-loading-spinner span:nth-child(4) { transform: translate(-50%, -50%) rotate(135deg) translateY(-6px); }
        .signup-loading-spinner span:nth-child(5) { transform: translate(-50%, -50%) rotate(180deg) translateY(-6px); }
        .signup-loading-spinner span:nth-child(6) { transform: translate(-50%, -50%) rotate(225deg) translateY(-6px); }
        .signup-loading-spinner span:nth-child(7) { transform: translate(-50%, -50%) rotate(270deg) translateY(-6px); }
        .signup-loading-spinner span:nth-child(8) { transform: translate(-50%, -50%) rotate(315deg) translateY(-6px); }

        .signup-loading-spinner {
            animation: flower-spin 1.5s linear infinite;
        }

        @keyframes flower-spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .signup-loading-overlay.error {
            border-color: #7f1d1d;
        }

        .signup-loading-overlay.error .signup-loading-spinner {
            animation: none;
        }

        .signup-loading-overlay.error .signup-loading-spinner span {
            background: #ef4444;
        }

        .signup-loading-overlay.error span {
            color: #fca5a5;
        }

        .signup-close {
            position: absolute;
            top: 16px;
            right: 16px;
            background: transparent;
            border: none;
            color: var(--text-muted);
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            transition: background 0.3s ease;
        }

        .signup-close:hover {
            background: var(--bg-tertiary);
            color: var(--text-primary);
        }

        .signup-title {
            font-size: 16px;
            font-weight: 600;
            color: #D4D4D8;
            text-align: center;
            margin-bottom: 10px;
        }

        .signup-label {
            display: block;
            font-size: 13px;
            color: #A1A1AA;
            margin-bottom: 6px;
        }

        .signup-input {
            width: 100%;
            padding: 8px 14px;
            background: #18181A;
            border: 1px solid #282932;
            border-radius: 24px;
            font-size: 14px;
            color: #E4E4E7;
            outline: none;
            transition: border-color 0.3s ease;
            box-sizing: border-box;
            margin-bottom: 12px;
        }

        .signup-input:focus {
            border-color: #525FFF;
        }

        .signup-input::placeholder {
            color: #71717A;
        }

        .signup-btn {
            width: 100%;
            padding: 8px;
            background: #526FFF;
            border: none;
            border-radius: 24px;
            font-size: 14px;
            font-weight: 600;
            color: black;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-top: 12px;
        }

        .signup-btn:hover {
            background: #6B85FF;
        }

        .signup-divider {
            display: flex;
            align-items: center;
            margin: 20px 0;
            color: #71717A;
            font-size: 13px;
        }

        .signup-divider::before,
        .signup-divider::after {
            content: '';
            flex: 1;
            height: 1px;
            background: #3F3F46;
        }

        .signup-divider span {
            padding: 0 12px;
        }

        .signup-phantom-btn {
            width: 100%;
            padding: 8px 20px;
            background: #323542;
            border: none;
            border-radius: 24px;
            font-size: 14px;
            font-weight: 500;
            color: white;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
        }

        .signup-phantom-btn:hover {
            background: #3F3F46;
        }

        .signup-phantom-logo {
            width: 22px;
            height: 22px;
            border-radius: 4px;
            object-fit: contain;
        }

        .signup-metamask-logo {
            width: 24px;
            height: 24px;
            object-fit: contain;
        }

        .signup-login-link {
            font-size: 13px;
            color: #A1A1AA;
            text-align: center;
            margin-top: 20px;
        }

        .signup-login-link a {
            color: #526FFF;
            text-decoration: none;
        }

        .signup-login-link a:hover {
            text-decoration: underline;
        }

        .signup-terms {
            font-size: 11px;
            color: #71717A;
            text-align: center;
            margin-top: 12px;
            line-height: 1.5;
            word-wrap: break-word;
        }

        .signup-terms a {
            color: #526FFF;
            text-decoration: none;
        }

        .signup-terms a:hover {
            text-decoration: underline;
        }

        .signup-loading {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 16px;
            padding: 32px;
        }

        .signup-loading span {
            font-size: 14px;
            color: var(--text-secondary);
        }

        .signup-spinner {
            width: 32px;
            height: 32px;
            border: 3px solid #3F3F46;
            border-top-color: #526FFF;
            border-radius: 50%;
            animation: signup-spin 1s linear infinite;
        }

        @keyframes signup-spin {
            to { transform: rotate(360deg); }
        }

        /* Responsive styles */
        @media (max-width: 768px) {
            .promo-title {
                font-size: 32px;
            }
            .promo-subtitle {
                font-size: 14px;
            }
            .hero-title {
                font-size: 40px;
            }
            .hero-subtitle {
                font-size: 16px;
            }
            .promo-section {
                padding: 40px 20px;
            }
            .engine-section {
                padding: 40px 20px;
            }
            .engine-list-box {
                min-height: 200px;
            }
            header {
                padding: 16px 20px;
            }
            .header-nav {
                gap: 12px;
            }
            .header-btn {
                padding: 8px 14px;
                font-size: 12px;
            }
            .hero {
                padding: 120px 20px 60px;
            }
            .features-grid {
                grid-template-columns: repeat(4, 1fr);
                gap: 6px;
            }
            .feature-tab {
                padding: 14px 16px;
            }
            .feature-tab-title {
                font-size: 14px;
            }
            .feature-tab-desc {
                font-size: 11px;
                white-space: nowrap;
            }
            .engine-layout {
                display: grid;
                grid-template-columns: 160px 1fr;
                gap: 2px;
                height: 340px;
            }
            .engine-list-title {
                font-size: 11px;
            }
            .engine-list-desc {
                font-size: 10px;
            }
            .engine-list-item {
                padding: 8px 12px;
            }
        }

        @media (max-width: 480px) {
            .hero-title {
                font-size: 28px;
            }
            .promo-title {
                font-size: 24px;
            }
            .logo-icon-img {
                width: 28px;
                height: 28px;
            }
            .logo-text {
                height: 18px;
            }
            .rewards-section {
                padding: 20px;
            }
            .rewards-box {
                padding: 16px;
            }
            .rewards-box h3 {
                font-size: 16px;
            }
            .rewards-box p {
                font-size: 13px;
            }
            .arch-section {
                padding: 24px 16px;
            }
            .arch-header h2 {
                font-size: 20px;
            }
            .arch-card h3 {
                font-size: 16px;
            }
            .arch-card p {
                font-size: 13px;
            }
            .arch-card {
                padding: 16px;
            }
            .faq-section {
                padding: 40px 20px;
            }
            footer {
                padding: 20px;
            }
            .features-section {
                padding: 16px;
            }
            .feature-tab {
                padding: 10px 12px;
            }
            .feature-tab-title {
                font-size: 12px;
            }
            .feature-tab-desc {
                font-size: 10px;
                white-space: nowrap;
                overflow: hidden;
                text-overflow: ellipsis;
            }
            .engine-layout {
                grid-template-columns: 120px 1fr;
                gap: 2px;
                height: 280px;
            }
            .engine-list-item {
                padding: 6px 8px;
            }
            .engine-list-title {
                font-size: 10px;
            }
            .engine-list-desc {
                font-size: 9px;
            }
        }