:root {
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --primary: #ef4444;
    --primary-hover: #dc2626;
    --border: #e5e7eb;
    --footer-bg: #111827;
    --footer-text: #f9fafb;
    --footer-muted: #9ca3af;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --radius: 12px;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-color: #111827;
    --card-bg: #1f2937;
    --text-main: #f9fafb;
    --text-muted: #9ca3af;
    --border: #374151;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Glow Background */
.glow-bg {
    position: fixed;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 80vw;
    height: 80vw;
    background: radial-gradient(circle, rgba(239, 68, 68, 0.05) 0%, rgba(0,0,0,0) 60%);
    z-index: -1;
    pointer-events: none;
}

[data-theme="dark"] .glow-bg {
    background: radial-gradient(circle, rgba(239, 68, 68, 0.12) 0%, rgba(0,0,0,0) 60%);
}

/* Animations */
.animate-in {
    animation: fadeUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
}

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

.app-container {
    flex: 1;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

header {
    margin-bottom: 2rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-switch-container-header {
    display: flex;
    align-items: center;
}

.theme-btn-header {
    background: transparent;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.2s;
}

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

#home-btn {
    padding: 0.4rem 0.8rem;
    font-size: 0.875rem;
    border-radius: 9999px;
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

.card {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.input-group {
    display: flex;
    gap: 0.5rem;
}

@media (max-width: 600px) {
    .input-group {
        flex-direction: column;
    }
}

input[type="text"] {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--bg-color);
    color: var(--text-main);
    transition: var(--transition);
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}

button {
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 8px;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

#get-btn {
    background-color: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    box-shadow: 0 4px 14px 0 rgba(239, 68, 68, 0.39);
}

#get-btn:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.23);
    transform: translateY(-2px);
}

.error {
    color: var(--primary);
    margin-top: 0.75rem;
    font-size: 0.875rem;
}


.hidden {
    display: none !important;
}

.preview-container {
    position: relative;
    width: 100%;
    border-radius: 8px;
    overflow: hidden;
    background-color: #000;
    aspect-ratio: 16/9;
    margin-bottom: 1.5rem;
}

#thumbnail-preview {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

.action-buttons {
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.secondary-btn {
    background-color: var(--bg-color);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.secondary-btn:hover {
    background-color: var(--border);
}

.quality-options h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.download-grid {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.download-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background-color: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--border);
}

@media (max-width: 480px) {
    .download-item {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }
}

.quality-label {
    font-weight: 500;
    color: var(--text-main);
}

.btn-group {
    display: flex;
    gap: 0.5rem;
}

.download-btn {
    background-color: var(--primary);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    flex: 1;
}

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

.copy-btn {
    background-color: var(--card-bg);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 0.5rem;
    font-size: 1rem;
}

.copy-btn:hover {
    background-color: var(--border);
}

/* Modern Footer Styles */
.modern-footer {
    background: transparent;
    color: var(--text-muted);
    padding: 1.5rem 1rem 1rem;
    text-align: center;
    margin-top: auto;
    position: relative;
    overflow: hidden;
}

.modern-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
}

.modern-footer::after {
    content: '';
    position: absolute;
    top: 0;
    left: -200px;
    width: 200px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    box-shadow: 0 0 15px var(--primary), 0 0 5px var(--primary);
    animation: movingGlow 4s ease-in-out infinite;
}

@keyframes movingGlow {
    0% { left: -200px; }
    50% { left: 100%; }
    100% { left: -200px; }
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-top {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.description {
    font-size: 0.875rem;
}

.made-with {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-main);
}

.heart {
    color: var(--primary);
    display: inline-block;
    animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.projects-section {
    margin-top: 0.5rem;
}

.projects-section h4 {
    margin-bottom: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.7rem;
    font-weight: 600;
}

.project-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.project-link {
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 0.25rem 0;
}

.project-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
    box-shadow: 0 0 8px var(--primary);
}

.project-link:hover {
    color: var(--primary);
    text-shadow: 0 0 8px rgba(239, 68, 68, 0.4);
}

.project-link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.copyright {
    font-size: 0.75rem;
    margin-top: 0.5rem;
    opacity: 0.6;
}

.theme-switch-container-header {
    display: flex;
    align-items: center;
}

.theme-btn-header {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
}

.theme-btn-header:hover {
    background-color: var(--border);
    transform: scale(1.1);
}