/* YouTube to MP3 Converter Styles */

:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --youtube-red: #ff0000;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 30px rgba(0, 0, 0, 0.2);
}

/* Global Styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

/* Hero Section */
.hero-section {
    background: var(--gradient-primary);
    color: white;
    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 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero-section .container {
    position: relative;
    z-index: 2;
}

.hero-section h1 {
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    margin-bottom: 1.5rem;
}

.hero-section .lead {
    font-size: 1.25rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

/* Converter Card */
.converter-card {
    max-width: 800px;
    margin-top: 2rem;
}

.converter-card .card {
    border-radius: 20px;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-heavy);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.converter-card .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.converter-card .input-group-text {
    border: none;
    background: var(--gradient-primary);
    color: white;
    font-size: 1.2rem;
}

.converter-card .form-control,
.converter-card .form-select {
    border: 2px solid #e9ecef;
    border-radius: 10px;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.converter-card .form-control:focus,
.converter-card .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.converter-card .btn-primary {
    background: var(--gradient-primary);
    border: none;
    border-radius: 15px;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.converter-card .btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.converter-card .btn-primary:hover::before {
    left: 100%;
}

.converter-card .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.3);
}

/* Progress Section */
.progress {
    border-radius: 15px;
    background-color: #e9ecef;
    overflow: hidden;
}

.progress-bar {
    border-radius: 15px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

#progressText {
    font-weight: 600;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

#statusText {
    font-size: 1rem;
    font-weight: 500;
    color: var(--primary-color);
}

/* Video Info Section */
#videoInfo {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 15px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    box-shadow: var(--shadow-light);
}

#videoInfo img {
    border-radius: 10px;
    box-shadow: var(--shadow-medium);
}

#videoTitle {
    color: var(--dark-color);
    font-weight: 600;
    line-height: 1.4;
}

/* Download Section */
#downloadSection .alert-success {
    border: none;
    border-radius: 15px;
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    color: #155724;
    font-weight: 500;
}

#downloadSection .btn-success {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    border: none;
    border-radius: 15px;
    padding: 1rem 2rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

#downloadSection .btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(40, 167, 69, 0.3);
}

#downloadSection .btn-outline-primary {
    border: 2px solid var(--primary-color);
    border-radius: 15px;
    padding: 1rem 2rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

#downloadSection .btn-outline-primary:hover {
    background: var(--gradient-primary);
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.3);
}

/* Features Section */
.features-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.feature-card {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--shadow-light);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

.feature-icon {
    background: linear-gradient(135deg, rgba(0, 123, 255, 0.1) 0%, rgba(0, 123, 255, 0.05) 100%);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    transition: all 0.3s ease;
}

.feature-card:hover .feature-icon {
    background: var(--gradient-primary);
    color: white;
    transform: scale(1.1);
}

.feature-card h4 {
    color: var(--dark-color);
    font-weight: 600;
    margin: 1.5rem 0 1rem;
}

/* How It Works Section */
.how-it-works-section {
    background: white;
}

.step-card {
    padding: 2rem;
    transition: all 0.3s ease;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto;
    box-shadow: var(--shadow-medium);
    transition: all 0.3s ease;
}

.step-card:hover .step-number {
    transform: scale(1.2);
    box-shadow: var(--shadow-heavy);
}

.step-card h4 {
    color: var(--dark-color);
    font-weight: 600;
    margin: 1.5rem 0 1rem;
}

/* FAQ Section */
.faq-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.accordion-item {
    border: none;
    margin-bottom: 1rem;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-light);
}

.accordion-button {
    background: white;
    border: none;
    padding: 1.5rem;
    font-weight: 600;
    color: var(--dark-color);
    border-radius: 15px;
    transition: all 0.3s ease;
}

.accordion-button:not(.collapsed) {
    background: var(--gradient-primary);
    color: white;
    box-shadow: none;
}

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

.accordion-button::after {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23212529'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
    transition: transform 0.3s ease;
}

.accordion-button:not(.collapsed)::after {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23ffffff'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
    transform: rotate(180deg);
}

.accordion-body {
    background: white;
    padding: 1.5rem;
    color: var(--secondary-color);
    line-height: 1.7;
}

/* Disclaimer Section */
.disclaimer-section .alert {
    border-radius: 15px;
    border: 2px solid rgba(255, 193, 7, 0.3);
    background: linear-gradient(135deg, rgba(255, 193, 7, 0.1) 0%, rgba(255, 193, 7, 0.05) 100%);
}

.disclaimer-section h5 {
    color: #856404;
    font-weight: 600;
}

.disclaimer-section p {
    color: #856404;
    margin-bottom: 0;
    line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2.5rem;
    }
    
    .hero-section .lead {
        font-size: 1.1rem;
    }
    
    .converter-card {
        margin: 1rem;
    }
    
    .converter-card .card-body {
        padding: 1.5rem;
    }
    
    .feature-card,
    .step-card {
        padding: 1.5rem;
        margin-bottom: 2rem;
    }
    
    .step-number {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
    
    .feature-icon {
        width: 70px;
        height: 70px;
    }
    
    .feature-icon i {
        font-size: 2rem;
    }
}

@media (max-width: 576px) {
    .hero-section {
        padding: 3rem 0;
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .converter-card .btn-primary,
    #downloadSection .btn-success,
    #downloadSection .btn-outline-primary {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
    
    .row.mb-3 .col-md-6 {
        margin-bottom: 1rem;
    }
    
    #downloadSection .btn-lg {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    #downloadSection .btn-lg.ms-2 {
        margin-left: 0 !important;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

.slide-up {
    animation: slideUp 0.5s ease-out;
}

.bounce-in {
    animation: bounceIn 0.6s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { 
        opacity: 0;
        transform: translateY(30px);
    }
    to { 
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

/* Utility Classes */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient-primary {
    background: var(--gradient-primary);
}

.bg-gradient-secondary {
    background: var(--gradient-secondary);
}

.shadow-custom {
    box-shadow: var(--shadow-medium);
}

.border-gradient {
    border: 2px solid;
    border-image: var(--gradient-primary) 1;
}