@layer utilities {
            .content-auto {
                content-visibility: auto;
            }
            .backdrop-blur {
                backdrop-filter: blur(8px);
            }
            .text-shadow {
                text-shadow: 0 2px 4px rgba(0,0,0,0.3);
            }
            .mobile-menu-enter {
                animation: slideIn 0.3s ease-out forwards;
            }
            .mobile-menu-exit {
                animation: slideOut 0.3s ease-in forwards;
            }
            .modal-fade-in {
                animation: fadeIn 0.3s ease-out forwards;
            }
            .modal-fade-out {
                animation: fadeOut 0.3s ease-in forwards;
            }
            .video-scale-in {
                animation: scaleIn 0.4s ease-out forwards;
            }
            @keyframes slideIn {
                from { transform: translateX(100%); }
                to { transform: translateX(0); }
            }
            @keyframes slideOut {
                from { transform: translateX(0); }
                to { transform: translateX(100%); }
            }
            @keyframes fadeIn {
                from { opacity: 0; }
                to { opacity: 1; }
            }
            @keyframes fadeOut {
                from { opacity: 1; }
                to { opacity: 0; }
            }
            @keyframes scaleIn {
                from { transform: scale(0.95); opacity: 0; }
                to { transform: scale(1); opacity: 1; }
            }
        }
        /* Import Fonts */
        @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Montserrat:wght@300;400;500;600;700&family=Roboto+Mono:wght@400;500&display=swap');
        /* Base Styles */
        body {
            font-family: 'Inter', sans-serif;
            overflow-x: hidden;
        }
        /* iPhone Fullscreen Hint */
        #ios-fullscreen-hint {
            position: fixed;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            background: rgba(0,0,0,0.8);
            color: white;
            padding: 12px 20px;
            border-radius: 30px;
            font-size: 14px;
            z-index: 100;
            display: none;
            align-items: center;
            gap: 8px;
            backdrop-filter: blur(4px);
        }
        #ios-fullscreen-hint i {
            font-size: 16px;
        }
        .fullscreen-message {
            position: absolute;
            bottom: 20px;
            left: 0;
            right: 0;
            text-align: center;
            color: white;
            padding: 10px;
            background: rgba(0,0,0,0.6);
            backdrop-filter: blur(4px);
            font-size: 14px;
            z-index: 5;
        }
        /* Flip Clock Container - 可拖拽 */
        .flip-clock-container {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            cursor: grab;
            user-select: none;
            z-index: 10;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .flip-clock-container.dragging {
            cursor: grabbing;
        }
        /* Flip Clock Styles */
        .flip-clock {
            display: flex;
            gap: 0.5rem;
            align-items: center;
            justify-content: center;
        }
        .flip-unit {
            position: relative;
            width: clamp(2.5rem, 8vw, 6rem);
            height: clamp(4rem, 12vw, 10rem);
            perspective: 1000px;
        }
        .flip-card {
            position: relative;
            width: 100%;
            height: 100%;
            transform-style: preserve-3d;
            transition: transform 0.6s cubic-bezier(0.65, 0, 0.35, 1);
        }
        .flip-card.flipping {
            transform: rotateX(-180deg);
        }
        .flip-card-front,
        .flip-card-back {
            position: absolute;
            width: 100%;
            height: 100%;
            backface-visibility: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 0.5rem;
            background: #222;
            color: white;
            font-family: 'Orbitron', sans-serif;
            font-size: clamp(2rem, 6vw, 4.5rem);
            font-weight: 500;
            overflow: hidden;
        }
        .flip-card-back {
            transform: rotateX(180deg);
        }
        .flip-card::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 0;
            width: 100%;
            height: 1px;
            background: rgba(0,0,0,0.3);
            z-index: 10;
        }
        .flip-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 50%;
            background: rgba(255,255,255,0.1);
            z-index: 10;
            pointer-events: none;
        }
        .separator {
            color: white;
            font-size: clamp(2rem, 6vw, 4.5rem);
            font-weight: 300;
            display: flex;
            align-items: center;
            justify-content: center;
            height: clamp(4rem, 12vw, 10rem);
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }
        /* Date below clock */
        #date {
            color: white;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
            margin-top: 1rem;
            font-size: clamp(1rem, 3vw, 1.5rem);
            font-weight: 300;
            text-align: center;
        }
        /* Notifications */
        #welcome-notification {
            position: fixed;
            top: 80px;
            right: 20px;
            z-index: 100;
            opacity: 0;
            transition: opacity 0.3s ease;
            display: none;
        }
        /* Upload Area */
        .upload-area {
            transition: all 0.3s ease;
        }
        .upload-area:hover {
            transform: translateY(-5px);
        }
        /* Screensaver Preview */
        #screensaver-preview {
            transition: all 0.5s ease-in-out;
        }
        /* Loading Animation */
        .loader {
            border-top-color: #3B82F6;
            animation: spinner 0.6s linear infinite;
        }
        @keyframes spinner {
            to { transform: rotate(360deg); }
        }
        /* Fade In Animation */
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        .fade-in {
            animation: fadeIn 0.5s ease-in-out;
        }
        /* Success Animation */
        @keyframes successPop {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); box-shadow: 0 0 20px rgba(16, 185, 129, 0.4); }
            100% { transform: scale(1); }
        }
        .success-animation {
            animation: successPop 0.8s ease-in-out;
        }
        /* Smooth Scrolling */
        html {
            scroll-behavior: smooth;
        }
        /* Fullscreen Button */
        #fullscreen-btn {
            transition: all 0.3s ease;
        }
        #fullscreen-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }
        /* Exit Fullscreen Button */
        #exit-fullscreen-btn {
            position: absolute;
            top: 20px;
            right: 20px;
            background: rgba(0, 0, 0, 0.5);
            color: white;
            border: none;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            transition: opacity 0.3s ease;
            z-index: 10;
        }
        #screensaver-preview:hover #exit-fullscreen-btn {
            opacity: 1;
        }
        /* Mobile Menu */
        .mobile-menu {
            position: fixed;
            top: 0;
            right: 0;
            width: 70%;
            max-width: 300px;
            height: 100vh;
            background: white;
            z-index: 1000;
            transform: translateX(100%);
            box-shadow: -2px 0 10px rgba(0,0,0,0.1);
            padding-top: 80px;
            padding-left: 20px;
        }
        .mobile-menu a {
            display: block;
            padding: 12px 0;
            color: #1E293B;
            text-decoration: none;
            font-size: 16px;
            border-bottom: 1px solid #f0f0f0;
        }
        .mobile-menu a:hover {
            color: #3B82F6;
        }
        .menu-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.5);
            z-index: 999;
            display: none;
        }
        .close-menu {
            position: absolute;
            top: 20px;
            right: 20px;
            background: none;
            border: none;
            font-size: 24px;
            cursor: pointer;
            color: #1E293B;
        }
        /* Video Modal Styles */
        #video-modal {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.85);
            backdrop-filter: blur(4px);
            z-index: 2000;
            display: none;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }
        .video-container {
            position: relative;
            width: 100%;
            max-width: 900px;
            aspect-ratio: 16/9;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.3);
        }
        #close-video {
            position: absolute;
            top: -40px;
            right: 0;
            background: none;
            border: none;
            color: white;
            font-size: 24px;
            cursor: pointer;
            transition: all 0.2s ease;
            padding: 5px;
            z-index: 10;
        }
        #close-video:hover {
            transform: scale(1.1);
            color: #ef4444;
        }
        /* Responsive Video */
        .youtube-embed {
            width: 100%;
            height: 100%;
            border: none;
        }
        /* Demo Button Style */
        #watch-demo {
            transition: all 0.3s ease;
        }
        #watch-demo:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px -5px rgba(234, 179, 8, 0.3), 0 10px 10px -5px rgba(234, 179, 8, 0.1);
        }
        /* 按钮容器样式优化 */
        .hero-buttons {
            display: flex;
            flex-wrap: nowrap;
            justify-content: center;
            gap: 0.5rem;
            overflow-x: auto;
            padding: 0.5rem 0;
            scrollbar-width: none;
        }
        .hero-buttons::-webkit-scrollbar {
            display: none;
        }
        .hero-button {
            flex: 0 0 auto;
            white-space: nowrap;
            padding: 0.75rem 1.25rem;
            font-size: 0.875rem;
        }
        @media (max-width: 360px) {
            .hero-button {
                padding: 0.65rem 1rem;
                font-size: 0.8rem;
            }
        }
        /* 热门图片样式 */
        .popular-image-wrapper {
            position: relative;
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        .popular-image {
            flex: 1;
            position: relative;
        }
        .popular-image-title {
            padding: 0.75rem 0.5rem;
            background-color: white;
            color: #1E293B;
            font-size: 0.9rem;
            font-weight: 500;
            text-align: center;
            border-radius: 0 0 0.75rem 0.75rem;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            transition: background-color 0.3s ease;
        }
        .popular-image-wrapper:hover .popular-image-title {
            background-color: #f8fafc;
        }
        /* ====== 关键优化：压缩 Upload 区域 ====== */
        #upload {
            padding: 1rem !important;
            margin-bottom: 1.25rem !important;
        }
        #upload h3 {
            font-size: 1.375rem !important;
            margin-bottom: 0.75rem !important;
        }
        #upload-notification {
            margin-bottom: 0.75rem !important;
            padding: 0.5rem 0.75rem !important;
            font-size: 0.875rem !important;
        }
        .upload-area {
            padding: 1rem !important;
        }
        .upload-area i {
            font-size: 2rem !important;
            margin-bottom: 0.5rem !important;
        }
        .upload-area h4 {
            font-size: 1rem !important;
            margin-bottom: 0.25rem !important;
        }
        .upload-area p {
            font-size: 0.75rem !important;
            margin-bottom: 0.25rem !important;
        }
        .upload-area .text-xs {
            font-size: 0.625rem !important;
        }
        #image-url {
            padding: 0.5rem 0.75rem !important;
            font-size: 0.875rem !important;
        }
        #url-submit {
            padding: 0.5rem 0.875rem !important;
            font-size: 0.875rem !important;
        }
        #upload .flex.justify-center {
            padding-top: 0.5rem !important;
        }
        #preview-btn, #clear-btn {
            padding: 0.5rem 1rem !important;
            font-size: 0.875rem !important;
        }
        /* Hero Section 更紧凑 */
        .hero-section {
            margin-bottom: 1rem !important;
        }
        .hero-section p {
            margin-bottom: 0.75rem !important;
        }
        /* Popular Images: 一行5图（桌面） */
        #popular-images-container {
            grid-template-columns: repeat(1, minmax(0, 1fr));
            gap: 0.75rem;
        }
        @media (min-width: 640px) {
            #popular-images-container {
                grid-template-columns: repeat(2, minmax(0, 1fr));
            }
        }
        @media (min-width: 768px) {
            #popular-images-container {
                grid-template-columns: repeat(3, minmax(0, 1fr));
            }
        }
        @media (min-width: 1024px) {
            #popular-images-container {
                grid-template-columns: repeat(4, minmax(0, 1fr));
            }
        }
        @media (min-width: 1280px) {
            #popular-images-container {
                grid-template-columns: repeat(5, minmax(0, 1fr));
            }
        }
        .popular-image img {
            height: 100px !important;
            object-fit: cover;
        }
        /* 拖拽提示文字（固定在按钮下方） */
        #drag-instruction {
            font-weight: 999;
            text-align: center;
            margin-top: 0.5rem;
            font-size: 0.875rem;
            color: red;
        }
        
        .space-y-2 li {float: left;
    margin-right: 1rem;
}}