/* Variables */
:root {
    --background-color-dark: #0B0C10;
    --background-color-light: #F5F7FA;
    --container-bg-light: #FFFFFF;
    --container-bg-dark: #1C2530;
    --text-color-light: #1A202C;
    --text-color-dark: #D1D5DB;
    --light-text-light: #4A5568;
    --light-text-dark: #A0AEC0;
    --primary-accent-color: #00C4B4;
    --secondary-accent-color: #2B6CB0;
    --border-color-light: #E2E8F0;
    --border-color-dark: #2D3748;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.15);
    --radius: 8px;
    --glow-intensity: 0.6;
    --transition-speed: 0.3s;
}

/* Reset and Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    color: var(--text-color-light);
    line-height: 1.6;
    background-color: var(--background-color-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

body.dark-mode {
    background-color: var(--background-color-dark);
    color: var(--text-color-dark);
}

/* Main Content */
.main-content {
    padding: 32px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.main-content h2 {
    font-size: clamp(1.8rem, 4vw, 2rem);
    font-weight: 600;
    text-align: center;
    margin-bottom: 32px;
    color: var(--text-color-light);
    animation: textGlow 2s ease-in-out infinite alternate;
}

body.dark-mode .main-content h2 {
    color: var(--text-color-dark);
}

.main-content p {
    font-size: 1.1rem;
    color: var(--light-text-light);
    max-width: 700px;
    margin: 0 auto 24px;
    line-height: 1.8;
    text-align: center;
}

body.dark-mode .main-content p {
    color: var(--light-text-dark);
}

/* Converter Card */
.converter-card {
    background-color: var(--container-bg-light);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    border: 1px solid var(--border-color-light);
    margin-bottom: 24px;
}

body.dark-mode .converter-card {
    background-color: var(--container-bg-dark);
    border-color: var(--border-color-dark);
}

.upload-area {
    border: 2px dashed var(--primary-accent-color);
    border-radius: var(--radius);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition-speed), background-color var(--transition-speed);
    margin-bottom: 24px;
    background-color: rgba(0, 196, 180, 0.05);
}

body.dark-mode .upload-area {
    border-color: var(--secondary-accent-color);
    background-color: rgba(43, 108, 176, 0.05);
}

.upload-area:hover,
.upload-area:focus {
    border-color: var(--secondary-accent-color);
    background-color: rgba(43, 108, 176, 0.1);
    outline: none;
}

.upload-area i {
    font-size: 48px;
    color: var(--primary-accent-color);
    margin-bottom: 16px;
    text-shadow: 0 0 6px rgba(0, 196, 180, var(--glow-intensity));
}

.upload-area h3 {
    margin-bottom: 12px;
    font-weight: 500;
    font-size: 1.25rem;
    color: var(--text-color-light);
}

body.dark-mode .upload-area h3 {
    color: var(--text-color-dark);
}

.upload-area p {
    color: var(--light-text-light);
    margin-bottom: 16px;
    font-size: 0.95rem;
}

body.dark-mode .upload-area p {
    color: var(--light-text-dark);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-accent-color);
    color: #fff;
    padding: 10px 20px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
    border: none;
    cursor: pointer;
    box-shadow: 0 0 8px rgba(0, 196, 180, 0.4);
}

.btn:hover,
.btn:focus {
    background-color: var(--secondary-accent-color);
    box-shadow: 0 0 12px rgba(0, 196, 180, 0.6);
    outline: none;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary-accent-color);
    color: var(--primary-accent-color);
    box-shadow: none;
}

.btn-outline:hover,
.btn-outline:focus {
    background-color: rgba(0, 196, 180, 0.1);
    box-shadow: 0 0 8px rgba(0, 196, 180, 0.4);
    outline: none;
}

/* Divider and Options */
.or-divider {
    display: flex;
    align-items: center;
    margin: 24px 0;
    color: var(--light-text-light);
    font-size: 0.9rem;
}

body.dark-mode .or-divider {
    color: var(--light-text-dark);
}

.or-divider::before,
.or-divider::after {
    content: "";
    flex: 1;
    border-bottom: 1px solid var(--border-color-light);
}

body.dark-mode .or-divider::before,
body.dark-mode .or-divider::after {
    border-bottom-color: var(--border-color-dark);
}

.or-divider::before {
    margin-right: 12px;
}

.or-divider::after {
    margin-left: 12px;
}

.upload-options {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.option-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius);
    background-color: var(--container-bg-light);
    color: var(--primary-accent-color);
    text-decoration: none;
    transition: background-color var(--transition-speed), color var(--transition-speed), box-shadow var(--transition-speed);
    border: 1px solid var(--border-color-light);
}

body.dark-mode .option-btn {
    background-color: var(--container-bg-dark);
    border-color: var(--border-color-dark);
}

.option-btn:hover,
.option-btn:focus {
    background-color: var(--secondary-accent-color);
    color: #fff;
    box-shadow: 0 0 8px rgba(43, 108, 176, 0.6);
    outline: none;
}

.option-btn i {
    font-size: 18px;
}

/* File List */
.file-list {
    margin-top: 24px;
    display: none;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 12px;
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius);
    margin-bottom: 12px;
    background-color: var(--container-bg-light);
}

body.dark-mode .file-item {
    background-color: var(--container-bg-dark);
    border-color: var(--border-color-dark);
}

.file-item i {
    margin-right: 12px;
    color: var(--secondary-accent-color);
    font-size: 20px;
}

.file-info {
    flex: 1;
}

.file-name {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-color-light);
}

body.dark-mode .file-name {
    color: var(--text-color-dark);
}

.file-size {
    font-size: 0.85rem;
    color: var(--light-text-light);
}

body.dark-mode .file-size {
    color: var(--light-text-dark);
}

.remove-file {
    color: #E53E3E;
    cursor: pointer;
    padding: 8px;
    border: none;
    background: none;
    transition: color var(--transition-speed);
}

.remove-file:hover,
.remove-file:focus {
    color: #C53030;
    outline: none;
}

/* Action Buttons and Download */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 24px;
}

.download-container {
    text-align: center;
    margin-top: 24px;
}

.download-btn {
    background-color: var(--secondary-accent-color);
    box-shadow: 0 0 8px rgba(43, 108, 176, 0.4);
}

.download-btn:hover,
.download-btn:focus {
    background-color: var(--primary-accent-color);
    box-shadow: 0 0 12px rgba(0, 196, 180, 0.6);
    outline: none;
}

/* Compression Popup */
.compression-popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 2000;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.compression-popup-content {
    background-color: var(--container-bg-light);
    margin: 5% auto;
    padding: 24px;
    border-radius: var(--radius);
    max-width: 900px;
    box-shadow: var(--shadow);
    position: relative;
    overflow-y: auto;
    min-height: 80vh;
}

body.dark-mode .compression-popup-content {
    background-color: var(--container-bg-dark);
}

.compression-preview-container {
    display: flex;
    gap: 20px;
    margin-top: 20px;
    flex-wrap: nowrap;
}

.preview-column {
    flex: 1;
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius);
    padding: 15px;
    background-color: var(--container-bg-light);
}

body.dark-mode .preview-column {
    border-color: var(--border-color-dark);
    background-color: var(--container-bg-dark);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.preview-header h3 {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-color-light);
}

body.dark-mode .preview-header h3 {
    color: var(--text-color-dark);
}

.preview-canvas {
    width: 100%;
    height: 400px;
    border: none;
    background-color: #fff;
    object-fit: contain;
    display: block;
}

.compression-controls {
    margin: 30px 0;
}

.slider-container {
    margin-bottom: 20px;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
}

.slider-label {
    font-size: 0.9rem;
    color: var(--light-text-light);
}

body.dark-mode .slider-label {
    color: var(--light-text-dark);
}

.quality-slider {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--border-color-light);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

body.dark-mode .quality-slider {
    background: var(--border-color-dark);
}

.quality-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-accent-color);
    cursor: pointer;
    box-shadow: 0 0 5px rgba(0, 196, 180, 0.8);
}

.quality-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-accent-color);
    cursor: pointer;
    box-shadow: 0 0 5px rgba(0, 196, 180, 0.8);
}

.compression-stats {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
    flex-wrap: wrap;
    gap: 10px;
}

.stat-box {
    text-align: center;
    padding: 15px;
    border-radius: var(--radius);
    background-color: rgba(0, 196, 180, 0.1);
    flex: 1;
    min-width: 120px;
    max-width: 150px;
}

.stat-value {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-accent-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--light-text-light);
}

body.dark-mode .stat-label {
    color: var(--light-text-dark);
}

.compression-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.close-popup {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 24px;
    color: var(--light-text-light);
    cursor: pointer;
    border: none;
    background: none;
    transition: color var(--transition-speed);
}

body.dark-mode .close-popup {
    color: var(--light-text-dark);
}

.close-popup:hover,
.close-popup:focus {
    color: var(--primary-accent-color);
    outline: none;
}

.compression-popup-content::before {
    content: '';
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5) url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50"><circle cx="25" cy="25" r="20" stroke="white" stroke-width="5" fill="none" stroke-dasharray="31.415, 31.415"><animateTransform attributeName="transform" type="rotate" from="0 25 25" to="360 25 25" dur="1s" repeatCount="indefinite"/></circle></svg>') no-repeat center/50px;
    z-index: 1001;
}

.compression-popup-content.loading::before {
    display: block;
}

/* Features Section */
.features-section {
    padding: 48px 24px;
    text-align: center;
    background-color: rgba(0, 196, 180, 0.02);
}

.features-section h2 {
    font-size: clamp(1.8rem, 4vw, 2rem);
    font-weight: 600;
    color: var(--text-color-light);
    margin-bottom: 40px;
    animation: textGlow 2s ease-in-out infinite alternate;
}

body.dark-mode .features-section h2 {
    color: var(--text-color-dark);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.feature-card {
    background-color: var(--container-bg-light);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    border: 1px solid var(--border-color-light);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

body.dark-mode .feature-card {
    background-color: var(--container-bg-dark);
    border-color: var(--border-color-dark);
}

.feature-card:hover,
.feature-card:focus {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    outline: none;
}

.feature-card i {
    font-size: 36px;
    color: var(--primary-accent-color);
    margin-bottom: 16px;
    text-shadow: 0 0 6px rgba(0, 196, 180, var(--glow-intensity));
    display: block;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color-light);
}

body.dark-mode .feature-card h3 {
    color: var(--text-color-dark);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--light-text-light);
    line-height: 1.5;
}

body.dark-mode .feature-card p {
    color: var(--light-text-dark);
}

/* Ad Section */
.ad-section {
    text-align: center;
    padding: 40px 24px;
    background-color: var(--background-color-light);
}

body.dark-mode .ad-section {
    background-color: var(--background-color-dark);
}

.ad-section ins {
    display: block;
    margin: 0 auto;
    min-height: 90px;
}

/* Link Input */
.link-input-container {
    margin-top: 24px;
}

.link-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius);
    font-size: 0.95rem;
    margin-bottom: 12px;
    background-color: var(--container-bg-light);
    color: var(--text-color-light);
    transition: border-color var(--transition-speed), background-color var(--transition-speed);
}

body.dark-mode .link-input {
    background-color: var(--container-bg-dark);
    color: var(--text-color-dark);
    border-color: var(--border-color-dark);
}

.link-input:focus {
    border-color: var(--primary-accent-color);
    outline: none;
    box-shadow: 0 0 8px rgba(0, 196, 180, 0.4);
}

.link-input::placeholder {
    color: var(--light-text-light);
}

body.dark-mode .link-input::placeholder {
    color: var(--light-text-dark);
}

.hidden {
    display: none;
}

/* Animations */
@keyframes textGlow {
    0% { text-shadow: 0 0 4px rgba(0, 196, 180, 0.5); }
    50% { text-shadow: 0 0 10px rgba(0, 196, 180, 0.8); }
    100% { text-shadow: 0 0 4px rgba(0, 196, 180, 0.5); }
}

/* Responsive Styles (Mobile-First Approach) */
@media (min-width: 481px) {
    .main-content {
        padding: 32px 24px;
    }

    .upload-options {
        flex-direction: row;
        gap: 16px;
    }

    .option-btn {
        width: auto;
    }

    .action-buttons {
        flex-direction: row;
        gap: 16px;
    }

    .btn {
        width: auto;
    }

    .features-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }

    .compression-preview-container {
        flex-direction: row;
    }

    .preview-canvas {
        height: 400px;
    }

    .compression-popup-content {
        margin: 5% auto;
        padding: 24px;
        min-height: 80vh;
    }

    .compression-controls {
        margin: 30px 0;
    }

    .compression-actions {
        flex-direction: row;
        gap: 15px;
    }

    .compression-actions .btn {
        width: auto;
    }

    .compression-stats {
        flex-direction: row;
        gap: 10px;
    }

    .stat-box {
        padding: 15px;
        min-width: 120px;
        max-width: 150px;
    }
}

@media (min-width: 769px) {
    .main-content {
        padding: 32px 24px;
    }

    .compression-stats {
        flex-wrap: nowrap;
    }

    .stat-box {
        margin: 0 5px;
    }
}

@media (max-width: 480px) {
    .upload-area {
        padding: 30px 15px;
    }

    .upload-area i {
        font-size: 40px;
    }

    .upload-area h3 {
        font-size: 1.2rem;
    }

    .upload-area p {
        font-size: 0.9rem;
    }

    .main-content h2,
    .features-section h2 {
        font-size: 1.6rem;
    }

    .compression-stats {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }

    .stat-box {
        max-width: 100%;
        min-width: unset;
        width: 100%;
        padding: 10px;
    }
}