:root {
    /* Color Palette */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;

    /* Surfaces */
    --bg-dark: #0f0f23;
    --bg-darker: #070712;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-hover: rgba(255, 255, 255, 0.08);

    /* Text */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);

    /* Transitions */
    --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);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated Background */
.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    background:
        radial-gradient(circle at 20% 30%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(245, 87, 108, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(79, 172, 254, 0.1) 0%, transparent 50%);
    animation: backgroundShift 20s ease infinite;
}

@keyframes backgroundShift {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.8;
        transform: scale(1.1);
    }
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    animation: fadeInDown 0.6s ease-out;
}

.header-content {
    display: inline-block;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.logo svg {
    width: 48px;
    height: 48px;
    color: #667eea;
    filter: drop-shadow(0 0 20px rgba(102, 126, 234, 0.5));
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Card Styles */
.card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    animation: fadeInUp 0.6s ease-out backwards;
    transition: all var(--transition-base);
}

.card:hover {
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--glass-border);
}

.card-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

/* API Key Card */
.api-key-card {
    animation-delay: 0.1s;
}

.input-group {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.input-group input {
    flex: 1;
}

/* Form Styles */
.form-section {
    margin-bottom: var(--spacing-xl);
}

.form-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.char-counter {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-weight: 400;
    text-transform: none;
}

/* Input Styles */
input[type="text"],
input[type="password"],
input[type="number"],
textarea,
select {
    width: 100%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9375rem;
    transition: all var(--transition-base);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: #667eea;
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

textarea.textarea-input {
    resize: vertical;
    min-height: 100px;
    line-height: 1.6;
}

select.select-input {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%23ffffff' stroke-opacity='0.5' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 3rem;
}

/* Model Grid */
.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.model-option {
    position: relative;
    cursor: pointer;
}

.model-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.model-card {
    position: relative;
    background: rgba(255, 255, 255, 0.02);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
    height: 100%;
}

.model-option input[type="radio"]:checked+.model-card {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.2);
}

.model-card:hover {
    border-color: rgba(102, 126, 234, 0.5);
    transform: translateY(-2px);
}

.model-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: var(--primary-gradient);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.model-badge.fast {
    background: var(--accent-gradient);
}

.model-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.model-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Parameter Grid */
.param-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.param-control {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.param-control.full-width {
    grid-column: 1 / -1;
}

.param-control label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Collapse Toggle */
.collapse-toggle {
    width: 100%;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
    margin-bottom: var(--spacing-md);
}

.collapse-toggle:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(102, 126, 234, 0.5);
}

.collapse-toggle .chevron {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-base);
}

.collapse-toggle.active .chevron {
    transform: rotate(180deg);
}

.collapse-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.collapse-content.open {
    max-height: 500px;
}

.collapse-content .param-grid {
    padding-top: var(--spacing-md);
}

/* Buttons */
.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    justify-content: center;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-generate {
    width: 100%;
    background: var(--primary-gradient);
    color: white;
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1.125rem;
    box-shadow: var(--shadow-glow);
}

.btn-generate svg {
    width: 20px;
    height: 20px;
}

.btn-generate:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.5);
}

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

.btn-text {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: var(--spacing-sm);
    cursor: pointer;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

.btn-icon {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: var(--spacing-sm);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--glass-hover);
    color: var(--text-primary);
    border-color: rgba(102, 126, 234, 0.5);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

/* Status Messages */
.status-message {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    margin-top: var(--spacing-sm);
}

.status-message.success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #10b981;
}

.status-message.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

.status-message.info {
    background: rgba(79, 172, 254, 0.1);
    border: 1px solid rgba(79, 172, 254, 0.3);
    color: #4facfe;
}

/* Job Status */
.job-status {
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.job-status h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.job-status .status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-left: var(--spacing-sm);
}

.status-badge.pending {
    background: rgba(245, 158, 11, 0.2);
    color: #f59e0b;
}

.status-badge.running {
    background: rgba(79, 172, 254, 0.2);
    color: #4facfe;
}

.status-badge.complete {
    background: rgba(16, 185, 129, 0.2);
    color: #10b981;
}

.status-badge.failed {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin-top: var(--spacing-md);
}

.progress-fill {
    height: 100%;
    background: var(--primary-gradient);
    transition: width var(--transition-base);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        opacity: 0.5;
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: 0.5;
    }
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.video-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.video-item:hover {
    border-color: rgba(102, 126, 234, 0.5);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.video-item video {
    width: 100%;
    display: block;
    background: #000;
}

.video-info {
    padding: var(--spacing-md);
}

.video-info p {
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
}

.video-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-download {
    flex: 1;
    background: var(--accent-gradient);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 172, 254, 0.3);
}

/* Mode Toggle */
.mode-toggle {
    display: flex;
    gap: var(--spacing-md);
}

.mode-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.mode-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.02);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 0.9375rem;
    font-weight: 500;
}

.mode-option input[type="radio"]:checked+.mode-label {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.1);
}

.mode-label:hover {
    border-color: rgba(102, 126, 234, 0.5);
}

.mode-label svg {
    width: 20px;
    height: 20px;
}

/* Image Upload Area */
.image-upload-area {
    position: relative;
    min-height: 200px;
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    background: rgba(255, 255, 255, 0.02);
    border: 2px dashed var(--glass-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
}

.upload-placeholder:hover {
    border-color: rgba(102, 126, 234, 0.5);
    background: rgba(255, 255, 255, 0.05);
}

.upload-placeholder svg {
    width: 48px;
    height: 48px;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-md);
}

.upload-placeholder p {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.upload-placeholder span {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.image-preview {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 2px solid #667eea;
}

.image-preview img {
    width: 100%;
    height: auto;
    display: block;
    max-height: 400px;
    object-fit: contain;
    background: #000;
}

.btn-remove {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 36px;
    height: 36px;
    background: rgba(239, 68, 68, 0.9);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-remove:hover {
    background: rgba(239, 68, 68, 1);
    transform: scale(1.1);
}

.btn-remove svg {
    width: 18px;
    height: 18px;
}

/* Toggle Switch for Audio */
.toggle-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.toggle-switch {
    position: relative;
    width: 48px;
    height: 24px;
}

.toggle-switch input[type="checkbox"] {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    transition: all var(--transition-base);
    cursor: pointer;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: all var(--transition-base);
}

.toggle-switch input[type="checkbox"]:checked+.toggle-slider {
    background: var(--primary-gradient);
    border-color: #667eea;
}

.toggle-switch input[type="checkbox"]:checked+.toggle-slider::before {
    transform: translateX(24px);
}

.toggle-switch input[type="checkbox"]:focus+.toggle-slider {
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Utility Classes */
.hidden {
    display: none;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

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

/* Loading Spinner */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .header h1 {
        font-size: 2rem;
    }

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

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

    .input-group {
        flex-direction: column;
    }

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

    .mode-toggle {
        flex-direction: column;
    }
}

/* Stagger animations */
.generation-card {
    animation-delay: 0.2s;
}

.status-card {
    animation-delay: 0.3s;
}

.gallery-card {
    animation-delay: 0.4s;
}