:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
}

.app-container {
    display: flex;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* Header Styles */
.tool-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.tool-header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.tool-header p {
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.header-stats {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    background: white;
    padding: 0.75rem 1.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
}

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

.stat-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.stat-value {
    font-weight: 600;
    color: var(--text-main);
}

.stat-arrow {
    color: var(--text-muted);
}

.stat-badge {
    background: var(--success-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
}

/* Upload Section */
.upload-section {
    margin: 2rem 0;
}

.drop-zone {
    border: 3px dashed var(--border-color);
    border-radius: 1.5rem;
    padding: 4rem 2rem;
    text-align: center;
    background: white;
    transition: all 0.3s ease;
    cursor: pointer;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--primary-color);
    background: #eff6ff;
}

.upload-icon {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.drop-zone h2 {
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.drop-zone p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

/* Tool Container & Layout */
.tool-container {
    animation: fadeIn 0.4s ease-out;
}

.editor-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.panel-card {
    background: white;
    padding: 2rem;
    border-radius: 1.5rem;
    box-shadow: var(--shadow-lg);
    height: 100%;
}

.panel-card h3 {
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Compression Options */
.compression-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.option-card {
    border: 2px solid var(--border-color);
    border-radius: 1rem;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.option-card input {
    position: absolute;
    opacity: 0;
}

.option-card:hover {
    border-color: var(--primary-color);
}

.option-card.active {
    border-color: var(--primary-color);
    background: #eff6ff;
}

.option-title {
    display: block;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.option-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Custom Slider */
.custom-slider-container {
    background: #f1f5f9;
    padding: 1.5rem;
    border-radius: 1rem;
    margin-bottom: 2rem;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-weight: 600;
}

.styled-slider {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.styled-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    opacity: 0.9;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-muted);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* Preview Panel */
.file-details {
    background: #f1f5f9;
    padding: 2rem;
    border-radius: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-bottom: 2rem;
}

.file-icon-large {
    font-size: 5rem;
    color: #ef4444;
    margin-bottom: 1rem;
}

.file-meta h4 {
    margin-bottom: 0.25rem;
    word-break: break-all;
}

.file-meta p {
    color: var(--text-muted);
}

/* Status & Results */
.process-status {
    margin: 2rem 0;
}

.progress-bar-container {
    height: 10px;
    background: #e2e8f0;
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-bar {
    height: 100%;
    background: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}

.status-text {
    text-align: center;
    font-weight: 500;
}

.result-actions {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    animation: slideUp 0.4s ease-out;
}

.success-message {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--success-color);
    font-weight: 700;
    font-size: 1.125rem;
}

.hidden {
    display: none !important;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

@media (max-width: 968px) {
    .editor-layout {
        grid-template-columns: 1fr;
    }
}