:root {
    --color-primary: #1a1a2e;
    --color-accent: #e94560;
    --color-accent-light: #ff6b85;
    --color-secondary: #0f3460;
    --color-bg: #f8f9fa;
    --color-surface: #ffffff;
    --color-text: #2d3748;
    --color-text-light: #718096;
    --color-border: #e2e8f0;
    --color-success: #48bb78;
    --color-error: #f56565;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.1);
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--color-text);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Playfair Display', serif;
    font-size: 1.75rem;
    font-weight: 700;
    color: white;
    box-shadow: 0 8px 16px rgba(233, 69, 96, 0.3);
}

.logo-text {
    font-family: 'Playfair Display', serif;
    font-size: 1.75rem;
    font-weight: 700;
    color: white;
    letter-spacing: -0.02em;
}

.tagline {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    font-weight: 400;
}

/* Main Upload Section */
.upload-section {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

.upload-card {
    background: var(--color-surface);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: var(--shadow-xl);
    max-width: 600px;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.upload-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
}

.upload-header {
    text-align: center;
    margin-bottom: 2rem;
}

.title {
    font-family: 'Playfair Display', serif;
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--color-text-light);
    font-size: 1rem;
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--color-border);
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--color-bg);
    position: relative;
    overflow: hidden;
}

.upload-area:hover {
    border-color: var(--color-accent);
    background: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.upload-area.drag-over {
    border-color: var(--color-accent);
    background: linear-gradient(135deg, rgba(233, 69, 96, 0.05), rgba(255, 107, 133, 0.05));
    border-width: 3px;
}

.upload-content {
    transition: opacity var(--transition-base);
}

.upload-icon {
    color: var(--color-accent);
    margin-bottom: 1.5rem;
    animation: float 3s ease-in-out infinite;
}

.upload-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.upload-subtext {
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.upload-formats {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.format-badge {
    background: var(--color-primary);
    color: white;
    padding: 0.375rem 0.875rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* Upload Progress */
.upload-progress {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.progress-icon {
    margin-bottom: 1.5rem;
}

.spinner {
    width: 64px;
    height: 64px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.progress-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 1.5rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
    border-radius: 4px;
    transition: width var(--transition-base);
    animation: shimmer 2s infinite;
}

.progress-percentage {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-light);
}

/* Upload Success */
.upload-success {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.success-icon {
    color: var(--color-success);
    margin-bottom: 1.5rem;
    animation: scaleIn 0.5s ease-out;
}

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

.success-filename {
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* File Info */
.file-info {
    margin: 1.5rem 0;
    animation: slideInUp 0.3s ease-out;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--color-bg);
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.file-icon {
    color: var(--color-accent);
    flex-shrink: 0;
}

.file-meta {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.25rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-size {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.btn-remove {
    background: none;
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.btn-remove:hover {
    background: var(--color-error);
    color: white;
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: 0 4px 12px rgba(233, 69, 96, 0.3);
    animation: slideInUp 0.3s ease-out;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(233, 69, 96, 0.4);
}

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

.btn-secondary {
    padding: 0.75rem 1.5rem;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--color-secondary);
    transform: translateY(-1px);
}

/* Tips */
.tips {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.tips-title {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

.tips-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.tips-list li {
    color: var(--color-text-light);
    font-size: 0.875rem;
    padding-left: 1.5rem;
    position: relative;
}

.tips-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: 700;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0 1rem;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
    animation: fadeIn 0.6s ease-out 0.4s backwards;
}

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

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

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

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

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

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem 1rem;
    }
    
    .upload-card {
        padding: 2rem 1.5rem;
        border-radius: 20px;
    }
    
    .title {
        font-size: 1.875rem;
    }
    
    .upload-area {
        padding: 2rem 1.5rem;
    }
    
    .logo-text {
        font-size: 1.5rem;
    }
    
    .logo-icon {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .upload-card {
        padding: 1.5rem 1rem;
    }
    
    .title {
        font-size: 1.5rem;
    }
    
    .upload-area {
        padding: 1.5rem 1rem;
    }
}