/* ===================================
   Light Nova Day Design System
   =================================== */

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

:root {
    /* Light Nova Day Colors */
    --primary: #667eea;
    --primary-light: #8b9ef5;
    --secondary: #f093fb;
    --accent: #4facfe;
    --success: #10d9a5;
    --error: #ff6b9d;
    --warning: #ffd93d;

    /* Light Backgrounds */
    --bg-primary: #f8f9ff;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-hover: #f0f3ff;
    --bg-upload: linear-gradient(135deg, #f8f9ff 0%, #fff5f8 100%);

    /* Text Colors */
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --text-muted: #a0aec0;

    /* Borders & Shadows */
    --border: #e2e8f0;
    --border-light: #edf2f7;
    --shadow-sm: 0 2px 8px rgba(102, 126, 234, 0.08);
    --shadow-md: 0 4px 20px rgba(102, 126, 234, 0.12);
    --shadow-lg: 0 10px 40px rgba(102, 126, 234, 0.15);
    --shadow-glow: 0 0 30px rgba(102, 126, 234, 0.25);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-success: linear-gradient(135deg, #10d9a5 0%, #0ba360 100%);
}

/* ===================================
   Base Styles
   =================================== */

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

/* ===================================
   Animated Background
   =================================== */

.nova-stars {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background-image:
        radial-gradient(2px 2px at 20% 30%, rgba(102, 126, 234, 0.3), transparent),
        radial-gradient(2px 2px at 60% 70%, rgba(240, 147, 251, 0.3), transparent),
        radial-gradient(1px 1px at 50% 50%, rgba(79, 172, 254, 0.3), transparent),
        radial-gradient(1px 1px at 80% 10%, rgba(16, 217, 165, 0.3), transparent),
        radial-gradient(2px 2px at 90% 60%, rgba(102, 126, 234, 0.2), transparent);
    background-size: 200% 200%;
    animation: starsFloat 20s ease-in-out infinite;
    z-index: 0;
}

@keyframes starsFloat {
    0%, 100% {
        background-position: 0% 0%, 0% 0%, 0% 0%, 0% 0%, 0% 0%;
    }
    50% {
        background-position: 100% 100%, 100% 100%, 100% 100%, 100% 100%, 100% 100%;
    }
}

.nova-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background: radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.05) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(240, 147, 251, 0.05) 0%, transparent 50%);
    z-index: 0;
}

/* ===================================
   Container & Layout
   =================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

/* ===================================
   Header
   =================================== */

.header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.6s ease-out;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo {
    display: inline-block;
    margin-bottom: 1rem;
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(5deg); }
}

.title {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ===================================
   Upload Card
   =================================== */

.upload-card {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    margin-bottom: 2rem;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Upload Zone
   =================================== */

.upload-zone {
    border: 3px dashed var(--border);
    border-radius: 20px;
    padding: 4rem 2rem;
    text-align: center;
    background: var(--bg-upload);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
    transition: left 0.5s;
}

.upload-zone:hover::before {
    left: 100%;
}

.upload-zone:hover {
    border-color: var(--primary);
    background: var(--bg-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.upload-zone.dragging {
    border-color: var(--primary);
    background: var(--bg-hover);
    transform: scale(1.02);
    box-shadow: var(--shadow-glow);
}

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

.upload-icon {
    margin-bottom: 1.5rem;
    animation: iconFloat 2s ease-in-out infinite;
}

@keyframes iconFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}

.upload-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.upload-specs {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.spec-item {
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.8);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    border: 1px solid var(--border-light);
}

.btn-browse {
    padding: 0.875rem 2rem;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: var(--shadow-sm);
}

.btn-browse:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-browse:active {
    transform: translateY(0);
}

/* ===================================
   Upload Progress
   =================================== */

.upload-progress {
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.progress-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.progress-percentage {
    font-size: 1.2rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.progress-bar {
    height: 8px;
    background: var(--bg-hover);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 10px;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

.progress-status {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
}

/* ===================================
   Messages
   =================================== */

.message {
    padding: 1rem 1.5rem;
    border-radius: 12px;
    margin-top: 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(-10px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.message.success {
    background: rgba(16, 217, 165, 0.1);
    border: 2px solid var(--success);
    color: #0a7354;
}

.message.error {
    background: rgba(255, 107, 157, 0.1);
    border: 2px solid var(--error);
    color: #c53363;
}

.message.warning {
    background: rgba(255, 217, 61, 0.1);
    border: 2px solid var(--warning);
    color: #b8860b;
}

/* ===================================
   Preview Section
   =================================== */

.preview-section {
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.preview-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.btn-clear {
    padding: 0.625rem 1.25rem;
    background: var(--gradient-secondary);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: var(--shadow-sm);
}

.btn-clear:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.preview-item {
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all 0.3s;
    animation: scaleIn 0.3s ease-out;
}

@keyframes scaleIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.preview-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.preview-image-container {
    position: relative;
    width: 100%;
    padding-top: 75%;
    background: var(--bg-hover);
    overflow: hidden;
}

.preview-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.preview-info {
    padding: 1rem;
}

.preview-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.preview-details {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.preview-actions {
    display: flex;
    gap: 0.5rem;
    padding: 0 1rem 1rem;
}

.btn-action {
    flex: 1;
    padding: 0.5rem;
    border: none;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-download {
    background: var(--gradient-accent);
    color: white;
}

.btn-delete {
    background: var(--gradient-secondary);
    color: white;
}

.btn-action:hover {
    transform: scale(1.05);
}

/* ===================================
   Statistics
   =================================== */

.stats-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    margin-top: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-icon {
    font-size: 2rem;
}

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===================================
   Footer
   =================================== */

.footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 3rem;
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .title {
        font-size: 2rem;
    }

    .upload-card {
        padding: 2rem 1.5rem;
    }

    .upload-zone {
        padding: 3rem 1.5rem;
    }

    .upload-specs {
        flex-direction: column;
        gap: 0.75rem;
    }

    .preview-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
    }

    .stats-card {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .preview-grid {
        grid-template-columns: 1fr;
    }

    .stats-card {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Loading Animation
   =================================== */

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spinner 0.8s linear infinite;
}

@keyframes spinner {
    to { transform: rotate(360deg); }
}