/* ============================================
   CSS VARIABLES & RESET
   ============================================ */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a2e;
    --bg-card-hover: #222240;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0b8;
    --text-muted: #6b6b80;
    
    --accent: #e94560;
    --accent-hover: #ff6b81;
    --accent-glow: rgba(233, 69, 96, 0.3);
    
    --gradient-1: linear-gradient(135deg, #e94560, #8b5cf6);
    
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px var(--accent-glow);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition: all 0.3s 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-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Animated Background */
.bg-animation {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: -1; overflow: hidden;
}
.bg-blob {
    position: absolute; border-radius: 50%;
    filter: blur(80px); opacity: 0.15;
    animation: blobFloat 20s ease-in-out infinite;
}
.blob-1 { width: 600px; height: 600px; background: var(--accent); top: -200px; right: -100px; }
.blob-2 { width: 500px; height: 500px; background: #8b5cf6; bottom: -150px; left: -100px; animation-delay: -5s; }
.blob-3 { width: 400px; height: 400px; background: #06b6d4; top: 50%; left: 50%; transform: translate(-50%, -50%); animation-delay: -10s; }
@keyframes blobFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(50px, -50px) scale(1.1); }
    50% { transform: translate(-30px, 30px) scale(0.9); }
    75% { transform: translate(40px, 40px) scale(1.05); }
}
.bg-grid {
    position: absolute; inset: 0;
    background-image: linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
}

/* Navigation */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 1rem 2rem;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}
.nav-container {
    max-width: 1200px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
}
.logo {
    display: flex; align-items: center; gap: 0.75rem;
    text-decoration: none; color: var(--text-primary);
    font-size: 1.5rem; font-weight: 800;
}
.logo-icon {
    width: 40px; height: 40px; background: var(--gradient-1);
    border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem; box-shadow: var(--shadow-glow);
}
.highlight {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.nav-links { display: flex; gap: 2rem; }
.nav-links a {
    color: var(--text-secondary); text-decoration: none;
    font-weight: 500; font-size: 0.95rem; transition: var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.75rem 1.5rem; border-radius: var(--radius-md);
    font-weight: 600; font-size: 0.95rem; cursor: pointer;
    transition: var(--transition); border: none;
    text-decoration: none; font-family: inherit;
}
.btn-primary {
    background: var(--gradient-1); color: white;
    padding: 1rem 2rem; border-radius: var(--radius-lg);
    font-weight: 700; white-space: nowrap;
    box-shadow: var(--shadow-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 50px var(--accent-glow); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-download {
    width: 100%; background: var(--gradient-1); color: white;
    padding: 1rem; font-size: 1.1rem; font-weight: 700;
    justify-content: center; box-shadow: var(--shadow-glow);
}
.btn-download:hover { transform: translateY(-2px); box-shadow: 0 0 60px var(--accent-glow); }

/* Hero */
.hero {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    padding: 8rem 2rem 4rem; text-align: center;
}
.hero-content { max-width: 800px; width: 100%; }
.badge {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    background: rgba(233, 69, 96, 0.1);
    border: 1px solid rgba(233, 69, 96, 0.3);
    border-radius: 50px; font-size: 0.85rem; font-weight: 500;
    color: var(--accent); margin-bottom: 1.5rem;
}
.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 900;
    line-height: 1.1; margin-bottom: 1.5rem; letter-spacing: -0.02em;
}
.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-sub {
    font-size: 1.15rem; color: var(--text-secondary);
    max-width: 600px; margin: 0 auto 2.5rem;
}

/* Downloader Card */
.downloader-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-xl); padding: 2rem;
    box-shadow: var(--shadow-lg); position: relative; overflow: hidden;
}
.downloader-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0;
    height: 1px; background: linear-gradient(90deg, transparent, var(--accent), transparent);
}
.input-group { display: flex; gap: 0.75rem; margin-bottom: 1rem; }
.input-wrapper { flex: 1; position: relative; display: flex; align-items: center; }
.input-icon { position: absolute; left: 1rem; color: var(--text-muted); font-size: 1.25rem; }
.input-wrapper input {
    width: 100%; padding: 1rem 3rem 1rem 3rem;
    background: var(--bg-secondary); border: 2px solid var(--border);
    border-radius: var(--radius-lg); color: var(--text-primary);
    font-size: 1rem; font-family: inherit; transition: var(--transition);
}
.input-wrapper input:focus {
    outline: none; border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow);
}
.input-wrapper input::placeholder { color: var(--text-muted); }
.paste-btn {
    position: absolute; right: 0.75rem; background: none; border: none;
    color: var(--text-muted); cursor: pointer; padding: 0.5rem;
    border-radius: var(--radius-sm); transition: var(--transition);
    font-size: 1.1rem;
}
.paste-btn:hover { color: var(--accent); background: rgba(233, 69, 96, 0.1); }

/* Options Panel */
.options-panel {
    margin-top: 1.5rem; padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}
.video-preview {
    display: flex; gap: 1rem; padding: 1rem;
    background: var(--bg-secondary); border-radius: var(--radius-lg);
    margin-bottom: 1.5rem; align-items: center;
}
.video-preview img {
    width: 160px; height: 90px; object-fit: cover;
    border-radius: var(--radius-md);
}
.video-info h3 {
    font-size: 1rem; font-weight: 600; margin-bottom: 0.25rem;
    display: -webkit-box; -webkit-line-clamp: 2;
    -webkit-box-orient: vertical; overflow: hidden;
}
.video-info p { font-size: 0.85rem; color: var(--text-muted); }
.selection-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 1.5rem; margin-bottom: 1.5rem; }
.selection-group label {
    display: flex; align-items: center; gap: 0.5rem;
    font-weight: 600; font-size: 0.9rem; color: var(--text-secondary);
    margin-bottom: 0.75rem;
}
.toggle-group { display: flex; gap: 0.5rem; }
.toggle-btn {
    flex: 1; padding: 0.75rem; background: var(--bg-secondary);
    border: 2px solid var(--border); border-radius: var(--radius-md);
    color: var(--text-secondary); font-weight: 600; font-size: 0.9rem;
    cursor: pointer; transition: var(--transition);
    display: flex; align-items: center; justify-content: center;
    gap: 0.5rem; font-family: inherit;
}
.toggle-btn.active {
    border-color: var(--accent); background: rgba(233, 69, 96, 0.1); color: var(--accent);
}
.toggle-btn:hover:not(.active) { border-color: var(--border-hover); background: var(--bg-card); }
.quality-options { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.quality-btn {
    padding: 0.6rem 1rem; background: var(--bg-secondary);
    border: 2px solid var(--border); border-radius: var(--radius-md);
    color: var(--text-secondary); font-weight: 500; font-size: 0.85rem;
    cursor: pointer; transition: var(--transition);
    display: flex; flex-direction: column; align-items: center;
    gap: 0.15rem; font-family: inherit; min-width: 80px;
}
.quality-btn .quality-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.05em; }
.quality-btn.active {
    border-color: var(--accent); background: rgba(233, 69, 96, 0.1); color: var(--accent);
}
.quality-btn:hover:not(.active) { border-color: var(--border-hover); background: var(--bg-card); }

/* Progress Bar */
.progress-container { margin-top: 1.5rem; }
.progress-header {
    display: flex; justify-content: space-between;
    margin-bottom: 0.5rem; font-size: 0.85rem; color: var(--text-secondary);
}
.progress-bar { height: 8px; background: var(--bg-secondary); border-radius: 50px; overflow: hidden; }
.progress-fill {
    height: 100%; background: var(--gradient-1); border-radius: 50px;
    width: 0%; transition: width 0.3s ease; position: relative;
}
.progress-fill::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Status Message */
.status-message {
    margin-top: 1rem; padding: 0.75rem 1rem;
    background: rgba(233, 69, 96, 0.1);
    border: 1px solid rgba(233, 69, 96, 0.3);
    border-radius: var(--radius-md);
    display: flex; align-items: center; gap: 0.75rem;
    font-size: 0.9rem; color: var(--accent);
}
.status-message.success {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.3); color: #10b981;
}
.status-message.error {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3); color: #ef4444;
}

/* Stats */
.stats {
    display: flex; justify-content: center; gap: 3rem; margin-top: 3rem;
}
.stat-item { text-align: center; }
.stat-number {
    display: block; font-size: 2rem; font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label {
    font-size: 0.85rem; color: var(--text-muted);
    text-transform: uppercase; letter-spacing: 0.1em;
}

/* Features */
.features { padding: 6rem 2rem; max-width: 1200px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 4rem; }
.section-header h2 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; margin-bottom: 1rem; }
.section-header p { color: var(--text-secondary); font-size: 1.1rem; }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.feature-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-xl); padding: 2rem;
    transition: var(--transition); position: relative; overflow: hidden;
}
.feature-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0;
    height: 2px; background: var(--gradient-1);
    transform: scaleX(0); transition: transform 0.3s ease;
}
.feature-card:hover { transform: translateY(-5px); border-color: var(--border-hover); box-shadow: var(--shadow-lg); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
    width: 50px; height: 50px; background: var(--gradient-1);
    border-radius: var(--radius-md); display: flex;
    align-items: center; justify-content: center;
    font-size: 1.25rem; margin-bottom: 1.25rem;
    box-shadow: var(--shadow-glow);
}
.feature-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.5rem; }
.feature-card p { color: var(--text-secondary); font-size: 0.95rem; }

/* How It Works */
.how-it-works {
    padding: 6rem 2rem; background: var(--bg-secondary);
    border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.steps-container {
    max-width: 900px; margin: 0 auto;
    display: flex; align-items: center; justify-content: center; gap: 1.5rem;
}
.step { text-align: center; flex: 1; }
.step-number {
    width: 40px; height: 40px; background: var(--gradient-1);
    border-radius: 50%; display: flex; align-items: center;
    justify-content: center; font-weight: 800; font-size: 1.1rem;
    margin: 0 auto 1rem; box-shadow: var(--shadow-glow);
}
.step-icon {
    width: 70px; height: 70px; background: var(--bg-card);
    border: 1px solid var(--border); border-radius: var(--radius-lg);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; color: var(--accent); margin: 0 auto 1rem;
}
.step h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.step p { color: var(--text-secondary); font-size: 0.9rem; }
.step-connector {
    width: 50px; height: 2px;
    background: linear-gradient(90deg, var(--accent), #8b5cf6);
    opacity: 0.3; flex-shrink: 0;
}

/* FAQ */
.faq { padding: 6rem 2rem; max-width: 800px; margin: 0 auto; }
.faq-container { display: flex; flex-direction: column; gap: 1rem; }
.faq-item {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); overflow: hidden;
    transition: var(--transition);
}
.faq-item:hover { border-color: var(--border-hover); }
.faq-question {
    width: 100%; padding: 1.25rem 1.5rem; background: none; border: none;
    color: var(--text-primary); font-size: 1rem; font-weight: 600;
    text-align: left; cursor: pointer; display: flex;
    align-items: center; justify-content: space-between;
    gap: 1rem; font-family: inherit; transition: var(--transition);
}
.faq-question i { color: var(--text-muted); transition: transform 0.3s ease; flex-shrink: 0; }
.faq-item.active .faq-question i { transform: rotate(180deg); color: var(--accent); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-answer p { padding: 0 1.5rem 1.25rem; color: var(--text-secondary); font-size: 0.95rem; }
.faq-item.active .faq-answer { max-height: 200px; }

/* Footer */
.footer { padding: 4rem 2rem 2rem; border-top: 1px solid var(--border); }
.footer-content {
    max-width: 1200px; margin: 0 auto;
    display: grid; grid-template-columns: 1fr 2fr; gap: 4rem; margin-bottom: 3rem;
}
.footer-brand p { color: var(--text-secondary); margin-top: 1rem; font-size: 0.9rem; }
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.footer-col h4 {
    font-size: 0.9rem; text-transform: uppercase;
    letter-spacing: 0.1em; color: var(--text-muted); margin-bottom: 1rem;
}
.footer-col a {
    display: block; color: var(--text-secondary); text-decoration: none;
    font-size: 0.9rem; padding: 0.3rem 0; transition: var(--transition);
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
    max-width: 1200px; margin: 0 auto; padding-top: 2rem;
    border-top: 1px solid var(--border); text-align: center;
    color: var(--text-muted); font-size: 0.85rem;
}

/* Loading Spinner */
.spinner {
    display: inline-block; width: 20px; height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white; border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Responsive */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero { padding: 7rem 1.5rem 3rem; }
    .input-group { flex-direction: column; }
    .btn-primary { width: 100%; justify-content: center; }
    .selection-grid { grid-template-columns: 1fr; }
    .stats { gap: 1.5rem; flex-wrap: wrap; }
    .stat-number { font-size: 1.5rem; }
    .steps-container { flex-direction: column; }
    .step-connector { width: 2px; height: 30px; background: linear-gradient(180deg, var(--accent), #8b5cf6); }
    .footer-content { grid-template-columns: 1fr; gap: 2rem; }
    .footer-links { grid-template-columns: repeat(2, 1fr); }
    .video-preview { flex-direction: column; text-align: center; }
    .video-preview img { width: 100%; height: auto; }
}
@media (max-width: 480px) {
    .quality-options { justify-content: center; }
    .footer-links { grid-template-columns: 1fr; }
}

/* Language Selector */
.nav-actions select {
    background: var(--bg-secondary); color: var(--text-primary);
    border: 1px solid var(--border); border-radius: var(--radius-sm);
    padding: 0.4rem 0.6rem; font-size: 0.85rem; cursor: pointer;
}
[dir="rtl"] .nav-actions { margin-left: 0; margin-right: auto; }
[dir="rtl"] .nav-links { flex-direction: row-reverse; }