/* Custom CSS for YTMP3 - YouTube to MP3 Converter */

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    scroll-behavior: smooth;
}

/* Navigation Styles */
.navbar {
    backdrop-filter: blur(10px);
    background: rgba(33, 37, 41, 0.95) !important;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
}

.navbar-nav .nav-link {
    font-weight: 500;
    margin: 0 10px;
    transition: color 0.3s ease;
}

.navbar-nav .nav-link:hover {
    color: #007bff !important;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 100" fill="%23ffffff10"><polygon points="0,0 1000,0 1000,100 0,100"/></svg>');
    background-size: 100px 100px;
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translateX(0); }
    100% { transform: translateX(-100px); }
}

.converter-card {
    position: relative;
    z-index: 2;
    animation: slideInUp 0.8s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.converter-card .card {
    border: none;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

/* Form Styles */
.input-group-lg .form-control {
    border-radius: 10px 0 0 10px;
    border: 2px solid #e9ecef;
    font-size: 1.1rem;
    padding: 15px;
    transition: all 0.3s ease;
}

.input-group-lg .form-control:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.input-group-lg .btn {
    border-radius: 0 10px 10px 0;
    font-weight: 600;
    transition: all 0.3s ease;
}

.input-group-lg .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 123, 255, 0.4);
}

.input-group-text {
    border-radius: 10px 0 0 10px;
    border: 2px solid #007bff;
    font-size: 1.2rem;
}

/* Progress Bar */
.progress {
    height: 10px;
    border-radius: 10px;
    background-color: #e9ecef;
    overflow: hidden;
}

.progress-bar {
    background: linear-gradient(90deg, #007bff, #0056b3);
    border-radius: 10px;
    transition: width 0.3s ease;
}

/* Features Section */
.feature-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #f8f9fa;
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    transition: transform 0.3s ease;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
}

/* How To Use Section */
.step-card {
    position: relative;
    padding: 30px;
}

.step-number {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(0, 123, 255, 0.3);
    transition: all 0.3s ease;
}

.step-card:hover .step-number {
    transform: scale(1.1);
    box-shadow: 0 15px 40px rgba(0, 123, 255, 0.4);
}

/* FAQ Section */
.accordion-item {
    border: none;
    margin-bottom: 15px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.accordion-button {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border: none;
    font-weight: 600;
    padding: 20px;
    border-radius: 10px;
}

.accordion-button:not(.collapsed) {
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: white;
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: none;
    border-color: transparent;
}

.accordion-body {
    padding: 20px;
    background: white;
    border-top: 1px solid #e9ecef;
}

/* Result Area */
.result-card {
    background: linear-gradient(135deg, #28a745, #20c997);
    color: white;
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    margin-top: 20px;
}

.download-btn {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid white;
    color: white;
    padding: 12px 30px;
    border-radius: 10px;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    margin-top: 15px;
    transition: all 0.3s ease;
}

.download-btn:hover {
    background: white;
    color: #28a745;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 255, 255, 0.3);
}

/* Footer */
footer {
    background: linear-gradient(135deg, #212529, #495057) !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        padding: 100px 0 50px;
        min-height: auto;
    }
    
    .display-4 {
        font-size: 2.5rem;
    }
    
    .converter-card .card-body {
        padding: 20px;
    }
    
    .input-group-lg .form-control,
    .input-group-lg .btn {
        font-size: 1rem;
        padding: 12px;
    }
    
    .step-number {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}

/* Loading Animation */
.loading-spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid #007bff;
    border-radius: 50%;
    vertical-align: middle;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    display: inline-block;
    margin-right: 10px;
}

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

/* Alert Styles */
.alert {
    border: none;
    border-radius: 10px;
    padding: 15px 20px;
    margin-top: 15px;
}

.alert-success {
    background: linear-gradient(135deg, #d4edda, #c3e6cb);
    color: #155724;
}

.alert-danger {
    background: linear-gradient(135deg, #f8d7da, #f5c6cb);
    color: #721c24;
}

.alert-info {
    background: linear-gradient(135deg, #d1ecf1, #bee5eb);
    color: #0c5460;
}

/* Smooth Transitions */
* {
    transition: all 0.3s ease;
}

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

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #007bff, #0056b3);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #0056b3, #004085);
}

/* Video Info Card */
.video-info {
    background: white;
    border-radius: 15px;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border-left: 5px solid #007bff;
}

.video-thumbnail {
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* Pulse Animation for Active Elements */
.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

/* Utilities */
.text-gradient {
    background: linear-gradient(135deg, #007bff, #0056b3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient-primary {
    background: linear-gradient(135deg, #007bff, #0056b3) !important;
}

.bg-gradient-success {
    background: linear-gradient(135deg, #28a745, #20c997) !important;
}

.shadow-lg-custom {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15) !important;
}