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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --accent: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #1e293b;
    --dark-light: #334155;
    --gray: #64748b;
    --gray-light: #cbd5e1;
    --light: #f1f5f9;
    --white: #ffffff;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --primary: #818cf8;
    --dark: #f1f5f9;
    --dark-light: #e2e8f0;
    --gray: #94a3b8;
    --gray-light: #475569;
    --light: #1e293b;
    --white: #0f172a;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--gradient-primary);
    background-attachment: fixed;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background var(--transition-slow);
}

[data-theme="dark"] body {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--light);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

.bg-particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 20s infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) translateX(0) rotate(0deg); }
    25% { transform: translateY(-50px) translateX(50px) rotate(90deg); }
    50% { transform: translateY(-100px) translateX(-50px) rotate(180deg); }
    75% { transform: translateY(-50px) translateX(-100px) rotate(270deg); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    position: relative;
    z-index: 1;
}

.page-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
    z-index: 1;
}

.theme-toggle-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    gap: var(--spacing-sm);
}

.theme-toggle, .settings-toggle {
    background: var(--white);
    border: none;
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-xl);
    transition: all var(--transition-base);
    font-size: 1.5rem;
}

.theme-toggle:hover, .settings-toggle:hover {
    transform: scale(1.1) rotate(10deg);
    box-shadow: var(--shadow-2xl);
}

.settings-toggle {
    color: var(--primary);
}

.settings-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background: var(--white);
    box-shadow: var(--shadow-2xl);
    z-index: 999;
    padding: var(--spacing-xl);
    overflow-y: auto;
    transition: right var(--transition-slow);
}

.settings-panel.open {
    right: 0;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.settings-header h3 {
    font-family: 'Poppins', sans-serif;
    font-size: 1.5rem;
    color: var(--dark);
}

.settings-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray);
    transition: all var(--transition-fast);
}

.settings-close:hover {
    color: var(--danger);
    transform: rotate(90deg);
}

.settings-section {
    margin-bottom: var(--spacing-lg);
}

.settings-section h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: var(--spacing-sm);
}

.color-picker-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.color-option {
    width: 100%;
    height: 60px;
    border: 3px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.color-option.active {
    border-color: var(--dark);
    transform: scale(1.05);
}

.color-option::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    color: white;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.color-option.active::after {
    opacity: 1;
}

header {
    padding: var(--spacing-xl) 0;
    text-align: center;
    animation: fadeInDown 0.8s ease-out;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    animation: bounceIn 1s ease-out;
}

.logo-icon {
    width: 70px;
    height: 70px;
    background: var(--white);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    box-shadow: var(--shadow-xl);
    transition: transform var(--transition-base);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.logo-icon:hover {
    transform: scale(1.1) rotate(5deg);
    animation: none;
}

.logo-text {
    font-family: 'Poppins', sans-serif;
    font-size: 2.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--white) 0%, rgba(255,255,255,0.8) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.tagline {
    font-size: 1.35rem;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 400;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
    animation: fadeIn 1.2s ease-out;
}

.subtitle {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.85);
    max-width: 700px;
    margin: 0 auto;
    animation: fadeIn 1.4s ease-out;
}

.main-content {
    padding: var(--spacing-lg) 0 var(--spacing-2xl);
}

.converter-card, .page-card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease-out;
    position: relative;
    overflow: hidden;
}

.converter-card::before, .page-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: var(--gradient-primary);
}

.page-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--light);
}

.page-header h1 {
    font-family: 'Poppins', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: var(--spacing-sm);
}

.page-header .icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.page-content {
    color: var(--dark);
    line-height: 1.8;
}

.page-content h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--dark);
    margin: var(--spacing-lg) 0 var(--spacing-md);
}

.page-content h3 {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--dark);
    margin: var(--spacing-md) 0 var(--spacing-sm);
}

.page-content p {
    margin-bottom: var(--spacing-md);
    color: var(--dark-light);
}

.page-content ul, .page-content ol {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-xl);
}

.page-content li {
    margin-bottom: var(--spacing-sm);
    color: var(--dark-light);
}

.page-content strong {
    color: var(--dark);
    font-weight: 600;
}

.back-home {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-full);
    font-weight: 600;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-lg);
}

.back-home:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.contact-info {
    background: var(--light);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    margin: var(--spacing-xl) 0;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-base);
}

.contact-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary);
    width: 40px;
    text-align: center;
}

.contact-item a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.contact-item a:hover {
    text-decoration: underline;
}

.faq-item {
    background: var(--light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-base);
}

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

.faq-question {
    font-family: 'Poppins', sans-serif;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.faq-question i {
    color: var(--primary);
}

.faq-answer {
    color: var(--dark-light);
    line-height: 1.7;
}

.converter-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--light);
}

.tab-btn {
    background: none;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: 600;
    color: var(--gray);
    cursor: pointer;
    transition: all var(--transition-base);
    border-bottom: 3px solid transparent;
    font-size: 1rem;
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease-out;
}

.converter-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.section-title {
    font-family: 'Poppins', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-title i {
    color: var(--primary);
    font-size: 1.75rem;
}

.upload-area {
    border: 3px dashed var(--gray-light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--light);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left 0.5s;
}

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

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 4rem;
    color: var(--primary);
    margin-bottom: var(--spacing-md);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

.upload-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: var(--spacing-xs);
}

.upload-subtitle {
    color: var(--gray);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
}

.browse-btn {
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    padding: 0.95rem 2.5rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.browse-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.browse-btn:hover::before {
    width: 300px;
    height: 300px;
}

.browse-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.file-input {
    display: none;
}

.batch-files-list {
    margin-top: var(--spacing-md);
    max-height: 300px;
    overflow-y: auto;
}

.batch-file-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--white);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xs);
    box-shadow: var(--shadow-sm);
    animation: slideInLeft 0.3s ease-out;
}

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

.batch-file-item i {
    font-size: 1.5rem;
    color: var(--primary);
}

.batch-file-info {
    flex: 1;
}

.batch-file-name {
    font-weight: 600;
    color: var(--dark);
    font-size: 0.9rem;
}

.batch-file-size {
    font-size: 0.75rem;
    color: var(--gray);
}

.batch-file-remove {
    background: var(--danger);
    border: none;
    color: white;
    width: 30px;
    height: 30px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.batch-file-remove:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.formats-container {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--light);
    border-radius: var(--radius-lg);
}

.formats-title {
    font-weight: 600;
    color: var(--dark);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.formats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: var(--spacing-sm);
}

.format-badge {
    background: var(--white);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.format-badge:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.format-badge i {
    color: var(--primary);
    font-size: 1.1rem;
}

.preview-container {
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    min-height: 350px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--light);
    margin-bottom: var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.preview-placeholder {
    text-align: center;
    color: var(--gray);
}

.preview-placeholder i {
    font-size: 5.5rem;
    color: var(--gray-light);
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
    animation: float-gentle 3s infinite;
}

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

.preview-placeholder p {
    font-size: 1.125rem;
    font-weight: 500;
}

.preview-image {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: zoomIn 0.5s ease-out;
}

.file-info {
    text-align: center;
    animation: fadeIn 0.5s ease-out;
}

.file-info i {
    font-size: 5.5rem;
    margin-bottom: var(--spacing-md);
}

.file-info h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--dark);
    word-break: break-word;
}

.file-info p {
    color: var(--gray);
    margin: var(--spacing-xs) 0;
}

.progress-container {
    margin-top: var(--spacing-md);
    display: none;
}

.progress-bar {
    width: 100%;
    height: 10px;
    background: var(--gray-light);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    width: 0%;
    transition: width var(--transition-base);
    border-radius: var(--radius-full);
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    text-align: center;
    font-size: 0.9rem;
    color: var(--gray);
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.btn {
    flex: 1;
    padding: 1.125rem 1.5rem;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 400px;
    height: 400px;
}

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

.btn-convert:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

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

.btn-download:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

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

.btn i {
    font-size: 1.2rem;
}

.features-section {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    animation: fadeInUp 1s ease-out;
}

.features-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.features-header h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: var(--spacing-sm);
}

.features-header p {
    color: var(--gray);
    font-size: 1.125rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    background: var(--light);
    transition: all var(--transition-base);
    border: 2px solid transparent;
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
    background: var(--white);
}

.feature-icon {
    width: 65px;
    height: 65px;
    border-radius: var(--radius-lg);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-icon i {
    font-size: 1.85rem;
    color: var(--white);
}

.feature-card h3 {
    font-family: 'Poppins', sans-serif;
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: var(--spacing-xs);
}

.feature-card p {
    color: var(--gray);
    line-height: 1.7;
}

.stats-section {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    animation: fadeInUp 1.2s ease-out;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-5px);
    background: var(--light);
}

.stat-number {
    font-family: 'Poppins', sans-serif;
    font-size: 2.75rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--gray);
    font-weight: 600;
    font-size: 1.05rem;
}

footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: rgba(255, 255, 255, 0.95);
    animation: fadeIn 1.5s ease-out;
}

.footer-content {
    max-width: 700px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.footer-link {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-weight: 500;
    padding: var(--spacing-xs);
}

.footer-link:hover {
    color: var(--white);
    transform: translateY(-2px);
}

.copyright {
    font-size: 0.9rem;
    opacity: 0.9;
}

.notification {
    position: fixed;
    top: 100px;
    right: 20px;
    background: var(--white);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
    display: none;
    align-items: center;
    gap: var(--spacing-sm);
    z-index: 1000;
    animation: slideInRight 0.3s ease-out;
    max-width: 450px;
    border-left: 5px solid var(--success);
}

.notification.show {
    display: flex;
}

.notification.success {
    border-left-color: var(--success);
}

.notification.error {
    border-left-color: var(--danger);
}

.notification i {
    font-size: 1.75rem;
}

.notification.success i {
    color: var(--success);
}

.notification.error i {
    color: var(--danger);
}

.notification-text {
    flex: 1;
    color: var(--dark);
    font-weight: 500;
}

.spinner {
    display: inline-block;
    width: 22px;
    height: 22px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--white);
    animation: spin 0.8s linear infinite;
}

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

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.7);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.08);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        transform: scale(1);
    }
}

@media (max-width: 968px) {
    .converter-layout {
        grid-template-columns: 1fr;
    }
    
    .theme-toggle-container {
        top: 10px;
        right: 10px;
    }

    .theme-toggle, .settings-toggle {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }

    .settings-panel {
        width: 100%;
        right: -100%;
    }
}

@media (max-width: 768px) {
    .logo-text {
        font-size: 2.25rem;
    }

    .tagline {
        font-size: 1.15rem;
    }

    .subtitle {
        font-size: 0.95rem;
    }

    .converter-card, .page-card {
        padding: var(--spacing-lg);
    }

    .section-title {
        font-size: 1.3rem;
    }

    .action-buttons {
        flex-direction: column;
    }

    .features-header h2, .page-header h1 {
        font-size: 1.75rem;
    }

    .stat-number {
        font-size: 2.25rem;
    }

    .notification {
        right: 10px;
        left: 10px;
        max-width: none;
    }

    .converter-tabs {
        overflow-x: auto;
    }
}

@media (max-width: 480px) {
    .logo-icon {
        width: 55px;
        height: 55px;
        font-size: 1.75rem;
    }

    .logo-text {
        font-size: 1.9rem;
    }

    .upload-icon {
        font-size: 3.25rem;
    }

    .formats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}