:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #22d3ee;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #f59e0b;
    --success: #10b981;
    --error: #ef4444;
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--background) 0%, #1a1f3a 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* Header Styles */
.header {
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(148, 163, 184, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 2rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1.5rem;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.header-content {
    text-align: center;
    padding: 3rem 2rem 4rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.built-with {
    display: inline-block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 1px solid var(--surface-light);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.built-with:hover {
    background: var(--surface-light);
    color: var(--text-primary);
}

/* Button Styles */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.3);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--surface-light);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

.btn-upload {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1.125rem;
    font-weight: 600;
    transition: var(--transition);
    margin-top: 1rem;
}

.btn-upload:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.3);
}

/* Main Content */
.main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.creator-section {
    margin-bottom: 4rem;
}

.creator-container {
    background: var(--surface);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: 1px solid var(--surface-light);
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--surface-light);
    border-radius: var(--border-radius);
    padding: 4rem 2rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.upload-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.upload-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.upload-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

/* Photo Timeline */
.photo-timeline {
    margin-top: 2rem;
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.timeline-container {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding: 1rem 0;
}

.photo-item {
    position: relative;
    min-width: 150px;
    height: 150px;
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 2px solid var(--surface-light);
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.photo-remove {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: rgba(239, 68, 68, 0.9);
    color: white;
    border: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.photo-item:hover .photo-remove {
    opacity: 1;
}

/* Settings Panel */
.settings-panel {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--background);
    border-radius: var(--border-radius);
    border: 1px solid var(--surface-light);
}

.settings-panel h3 {
    margin-bottom: 1rem;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-group label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.setting-group input,
.setting-group select {
    background: var(--surface);
    border: 1px solid var(--surface-light);
    color: var(--text-primary);
    padding: 0.75rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.setting-group input:focus,
.setting-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Prompt Section */
.prompt-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--background);
    border-radius: var(--border-radius);
    border: 1px solid var(--surface-light);
}

.prompt-section h3 {
    margin-bottom: 1rem;
}

.prompt-input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#aiPrompt {
    background: var(--surface);
    border: 1px solid var(--surface-light);
    color: var(--text-primary);
    padding: 1rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    resize: vertical;
    min-height: 100px;
    transition: var(--transition);
}

#aiPrompt:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.prompt-suggestions {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.prompt-suggestions span {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.suggestion-btn {
    background: var(--surface);
    border: 1px solid var(--surface-light);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.875rem;
    transition: var(--transition);
}

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

/* Action Buttons */
.action-buttons {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Processing Modal */
.processing-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--surface);
    border-radius: var(--border-radius);
    padding: 3rem;
    max-width: 500px;
    width: 90%;
    text-align: center;
}

.processing-animation {
    margin-bottom: 2rem;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--surface-light);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.loading-text p {
    color: var(--text-secondary);
}

.processing-steps {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.5;
    transition: var(--transition);
}

.step.active {
    opacity: 1;
}

.step-icon {
    font-size: 1.5rem;
}

.step-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Preview Section */
.preview-section {
    margin-top: 2rem;
}

.preview-container {
    background: var(--surface);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: 1px solid var(--surface-light);
}

.preview-container h3 {
    margin-bottom: 1.5rem;
    text-align: center;
}

.video-player {
    margin-bottom: 1.5rem;
    border-radius: var(--border-radius);
    overflow: hidden;
}

#generatedVideo {
    width: 100%;
    max-height: 500px;
    border-radius: var(--border-radius);
}

.video-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
.footer {
    background: var(--surface);
    border-top: 1px solid var(--surface-light);
    margin-top: 4rem;
    padding: 3rem 0 1rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    border-top: 1px solid var(--surface-light);
    text-align: center;
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }

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

    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }

    .processing-steps {
        flex-direction: column;
        gap: 1rem;
    }

    .step {
        flex-direction: row;
        justify-content: center;
    }

    .video-actions {
        flex-direction: column;
    }

    .video-actions button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-subtitle {
        font-size: 1rem;
    }

    .upload-area {
        padding: 2rem 1rem;
    }

    .creator-container {
        padding: 1rem;
    }

    .prompt-suggestions {
        flex-direction: column;
        align-items: stretch;
    }

    .suggestion-btn {
        width: 100%;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--surface-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}