* {
    font-family: 'Inter', sans-serif;
}

:root {
    --primary-color: #f91a2d;
    --text-color: #333;
    --bg-color: #f8f9fa;
    --card-bg: #fff;
    --border-color: #e0e0e0;
    --secondary-text: #666;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --hover-bg: #f1f3ff;
}

.dark-mode {
    --primary-color: #5d7dff;
    --text-color: #f0f0f0;
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --border-color: #333;
    --secondary-text: #aaa;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    --hover-bg: #2a2a3a;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.upload-area {
    border: 3px dashed var(--primary-color);
    background-color: var(--card-bg);
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-area:hover {
    transform: scale(1.02);
    background-color: var(--hover-bg);
}

.upload-area.dragover {
    background-color: var(--hover-bg);
    border-color: #0056b3;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #ff4757 100%);
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px -5px rgba(249, 26, 45, 0.5);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.preview-container {
    max-height: 400px;
    overflow-y: auto;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
}

.toast-message {
    animation: slideIn 0.3s ease, fadeOut 0.3s ease 2.7s;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
    }
}

.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

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

    100% {
        transform: rotate(360deg);
    }
}

.theme-toggle {
    background: var(--border-color);
    border: none;
    color: var(--text-color);
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background-color: var(--hover-bg);
}

.file-info {
    background-color: var(--hover-bg);
    border-left: 4px solid var(--primary-color);
}

.progress-bar {
    height: 8px;
    background: linear-gradient(90deg, var(--primary-color), #ff6b81);
    transition: width 0.3s ease;
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
}