/* Base styles */
:root {
    /* Color palette */
    --bg-dark: #0E0E11;
    --bg-card: rgba(20, 20, 25, 0.8);
    --text-light: #ffffff;
    --text-dim: rgba(255, 255, 255, 0.7);
    --accent-primary: #21D4FD;
    --accent-secondary: #B721FF;
    --accent-tertiary: #FF4081;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    
    /* Animation timings */
    --transition-fast: 120ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Sizes */
    --border-radius: 32px;
    --card-width: min(85vw, 400px);
    --card-height: calc(var(--card-width) * 1.4);
}

/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    width: 100%;
    overflow: hidden;
    overscroll-behavior: none;
    touch-action: none;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background: var(--bg-dark);
    color: var(--text-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Back link */
.back-link {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 100;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-light);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition-fast);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.back-link:hover, .back-link:active {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Container */
.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: 100%;
    padding: 20px;
    position: relative;
}

/* Screens */
.screen {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.screen.active {
    display: flex;
    opacity: 1;
    transform: translateY(0);
}

/* Welcome screen */
.title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
    text-align: center;
    background: linear-gradient(45deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 1rem;
    font-weight: 400;
    margin-bottom: 40px;
    text-align: center;
    color: var(--text-dim);
    max-width: 320px;
    line-height: 1.5;
}

/* Upload button */
.upload-container {
    margin-bottom: 40px;
}

.upload-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 180px;
    height: 180px;
    background: rgba(255, 255, 255, 0.05);
    border: 2px dashed rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition-normal);
    padding: 20px;
}

.upload-button:hover, .upload-button:active {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
    transform: scale(1.05);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    color: var(--accent-primary);
}

.upload-text {
    font-size: 1rem;
    font-weight: 500;
}

/* Features */
.features {
    display: flex;
    flex-direction: column;
    gap: 16px;
    width: 100%;
    max-width: 320px;
}

.feature {
    display: flex;
    align-items: center;
    gap: 16px;
    background: rgba(255, 255, 255, 0.05);
    padding: 12px 16px;
    border-radius: 12px;
}

.feature-icon {
    font-size: 1.5rem;
}

.feature-text {
    font-size: 0.9rem;
    color: var(--text-dim);
}

/* Card screen */
#card-container {
    width: var(--card-width);
    height: var(--card-height);
    perspective: 1200px;
    margin-bottom: 40px;
}

#card-renderer {
    width: 100%;
    height: 100%;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transform-style: preserve-3d;
    transform: rotateX(0deg) rotateY(0deg);
    transition: transform var(--transition-fast);
}

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    gap: 24px;
    width: 100%;
    max-width: var(--card-width);
}

.filter-controls {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.filter-button {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-dim);
    border: none;
    border-radius: 20px;
    padding: 8px 16px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.filter-button.active {
    background: linear-gradient(45deg, var(--accent-primary), var(--accent-secondary));
    color: var(--text-light);
}

.action-controls {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.action-button {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.action-button:hover, .action-button:active {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.action-button .icon {
    font-size: 1.2rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.modal.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 24px;
    width: 90%;
    max-width: 320px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-content h2 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    text-align: center;
}

.export-options {
    display: flex;
    justify-content: space-around;
    margin-bottom: 24px;
}

.export-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: var(--transition-fast);
    color: var(--text-light);
}

.export-option:hover, .export-option:active {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.export-option .icon {
    font-size: 2rem;
}

.modal-footer {
    display: flex;
    justify-content: center;
}

.cancel-button {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-dim);
    border: none;
    border-radius: 20px;
    padding: 8px 24px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.cancel-button:hover, .cancel-button:active {
    background: rgba(255, 255, 255, 0.2);
}

/* Loading overlay */
.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 20px;
}

.overlay.active {
    display: flex;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    border-top-color: var(--accent-primary);
    animation: spin 1s linear infinite;
}

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

.loading-text {
    font-size: 1rem;
    color: var(--text-dim);
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Responsive adjustments */
@media (max-width: 480px) {
    :root {
        --card-width: 85vw;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
    
    .upload-button {
        width: 150px;
        height: 150px;
    }
}

/* Landscape orientation adjustments */
@media (max-height: 500px) and (orientation: landscape) {
    :root {
        --card-width: 40vh;
        --card-height: calc(var(--card-width) * 1.4);
    }
    
    .container {
        flex-direction: row;
        justify-content: space-around;
        padding: 10px;
    }
    
    #welcome-screen {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 20px;
    }
    
    .title, .subtitle {
        width: 100%;
        margin-bottom: 10px;
    }
    
    .upload-container {
        margin-bottom: 0;
    }
    
    .upload-button {
        width: 120px;
        height: 120px;
    }
    
    .features {
        flex-direction: row;
        max-width: none;
        flex-wrap: wrap;
    }
    
    .feature {
        flex: 1;
        min-width: 150px;
    }
    
    #card-screen {
        flex-direction: row;
        align-items: center;
        gap: 20px;
    }
    
    #card-container {
        margin-bottom: 0;
    }
    
    .controls {
        height: var(--card-height);
        justify-content: center;
    }
}