/* frontend/assets/css/style.css */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #10b981;
    --dark: #1e1e2f;
    --darker: #14141f;
    --light: #f8fafc;
    --gray: #94a3b8;
    --danger: #ef4444;
    --warning: #f59e0b;
    --border-radius: 16px;
    --card-radius: 20px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--darker) 0%, var(--dark) 100%);
    color: var(--light);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 16px 40px;
}

/* Hero Section */
.hero {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    padding: 40px 0 60px;
}

.hero-content {
    flex: 1;
    min-width: 280px;
}

.hero-content h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-content p {
    font-size: 1.1rem;
    color: var(--gray);
    margin-bottom: 30px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-image {
    flex: 1;
    min-width: 280px;
    display: flex;
    justify-content: center;
}

.demo-preview {
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--border-radius);
    padding: 40px;
    text-align: center;
    border: 1px solid rgba(99, 102, 241, 0.3);
    backdrop-filter: blur(10px);
}

.demo-preview i {
    font-size: 4rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.demo-subtitle {
    background: rgba(0, 0, 0, 0.75);
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 1rem;
}

/* Features Section */
.features {
    padding: 40px 0;
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--card-radius);
    padding: 28px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 16px;
}

.feature-card h3 {
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--gray);
    font-size: 0.9rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 28px;
    border-radius: 40px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--light);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-small {
    padding: 8px 16px;
    font-size: 0.85rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--light);
    border: none;
    cursor: pointer;
}

/* Upload Section */
.upload-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.upload-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--card-radius);
    padding: 20px;
}

.upload-area {
    border: 2px dashed rgba(99, 102, 241, 0.3);
    border-radius: var(--border-radius);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

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

.upload-area i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 12px;
}

.video-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: rgba(16, 185, 129, 0.1);
    border-radius: var(--border-radius);
    margin-top: 12px;
}

.video-info i {
    color: var(--secondary);
}

.btn-icon {
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    margin-left: auto;
    font-size: 1.2rem;
}

/* Style Controls */
.style-controls {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--card-radius);
    padding: 24px;
    margin-bottom: 32px;
}

.style-controls h3 {
    margin-bottom: 20px;
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 20px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-group label {
    font-size: 0.85rem;
    color: var(--gray);
    font-weight: 500;
}

/* Dropdown Button */
.dropdown {
    position: relative;
}

.dropdown-btn {
    width: 100%;
    padding: 12px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: var(--light);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--dark);
    border-radius: 8px;
    margin-top: 4px;
    z-index: 100;
    display: none;
    flex-direction: column;
    border: 1px solid rgba(255, 255, 255, 0.1);
    max-height: 250px;
    overflow-y: auto;
}

.dropdown-menu.active {
    display: flex;
}

.dropdown-menu div {
    padding: 10px 12px;
    cursor: pointer;
    transition: var(--transition);
}

.dropdown-menu div:hover {
    background: var(--primary);
}

.color-menu div {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* SRT Editor */
.srt-editor-section {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--card-radius);
    padding: 24px;
    margin-bottom: 32px;
}

.editor-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 16px;
}

.editor-actions {
    display: flex;
    gap: 12px;
}

#srtEditor {
    width: 100%;
    min-height: 400px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 16px;
    color: var(--light);
    font-family: 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.5;
    resize: vertical;
}

#srtEditor:focus {
    outline: none;
    border-color: var(--primary);
}

.editor-actions-bottom {
    display: flex;
    gap: 16px;
    justify-content: flex-end;
    flex-wrap: wrap;
}

/* Preview Section */
.preview-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

@media (max-width: 768px) {
    .preview-section {
        grid-template-columns: 1fr;
    }
}

.video-preview-container {
    background: rgba(0, 0, 0, 0.5);
    border-radius: var(--card-radius);
    padding: 20px;
}

.preview-video-wrapper {
    position: relative;
}

#previewVideo {
    width: 100%;
    border-radius: 12px;
}

.subtitle-overlay {
    position: absolute;
    bottom: 20%;
    left: 0;
    right: 0;
    text-align: center;
    padding: 12px 20px;
    pointer-events: none;
}

#previewSubtitle {
    display: inline-block;
    padding: 8px 20px;
    border-radius: 8px;
    font-weight: 500;
}

.render-controls {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--card-radius);
    padding: 24px;
}

.render-options {
    margin: 20px 0;
}

.progress-container {
    margin: 20px 0;
}

.progress-bar {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    height: 8px;
    overflow: hidden;
}

.progress-fill {
    background: var(--primary);
    height: 100%;
    width: 0%;
    transition: width 0.3s ease;
}

.render-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* Loader */
.loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    display: none;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    z-index: 1000;
}

.loader-overlay.active {
    display: flex;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(99, 102, 241, 0.3);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* About Page */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-section {
    margin-bottom: 48px;
}

.about-section h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.tech-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.tech-card i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 12px;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.feature-list li i {
    color: var(--secondary);
}

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: 16px;
    }
    
    .hero {
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .controls-grid {
        grid-template-columns: 1fr;
    }
}