/* ================================
   Y2TuB - YouTube to MP3 Converter
   Custom Styles
   ================================ */

/* Root Variables */
:root {
    --primary-color: #dc3545;
    --primary-dark: #c82333;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gradient-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    --border-radius: 0.5rem;
    --transition: all 0.3s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    overflow-x: hidden;
}

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

::-webkit-scrollbar-track {
    background: var(--light-color);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Navigation Styles */
.navbar {
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.navbar-nav .nav-link {
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: var(--transition);
}

.navbar-nav .nav-link:hover {
    color: rgba(255, 255, 255, 0.8) !important;
    transform: translateY(-1px);
}

/* Hero Section */
.hero-section {
    background: var(--gradient-bg);
    /* 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 1000"><polygon fill="%23ffffff" fill-opacity="0.1" points="0,1000 1000,0 1000,1000"/></svg>');
    background-size: cover;
}

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

.hero-image {
    text-align: center;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* Card Styles */
.card {
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: none;
}

.card:hover {
    /* transform: translateY(-5px); */
    box-shadow: var(--shadow-lg);
}

.card-body {
    padding: 2rem;
}

/* Button Styles */
.btn {
    border-radius: var(--border-radius);
    font-weight: 600;
    padding: 0.75rem 2rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: var(--transition);
    border: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-danger {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
}

.btn-danger:hover {
    background: linear-gradient(45deg, var(--primary-dark), #a71d2a);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

/* Form Styles */
.form-control, .form-select {
    border-radius: var(--border-radius);
    border: 2px solid #e9ecef;
    padding: 0.75rem 1rem;
    transition: var(--transition);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

/* Placeholder Styles */
.form-control::placeholder {
    color: #6c757d;
    opacity: 0.7;
    font-style: italic;
}

.form-control:focus::placeholder {
    color: #adb5bd;
    opacity: 0.5;
}

.input-group-lg .form-control {
    font-size: 1.1rem;
    padding: 1rem;
}

.input-group-text {
    background: var(--light-color);
    border: 2px solid #e9ecef;
    border-right: none;
}

/* Progress Bar */
.progress {
    height: 10px;
    border-radius: 5px;
    background: #e9ecef;
}

.progress-bar {
    border-radius: 5px;
    transition: width 0.6s ease;
}

/* Features Section */
.feature-icon {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon i {
    transition: var(--transition);
}

.card:hover .feature-icon i {
    transform: scale(1.1);
    color: var(--primary-color) !important;
}

/* Step Numbers */
.step-number {
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
    font-weight: bold;
}

/* Accordion Styles */
.accordion-item {
    border: none;
    margin-bottom: 1rem;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.accordion-button {
    background: var(--light-color);
    border: none;
    font-weight: 600;
    padding: 1.25rem 1.5rem;
}

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

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

.accordion-body {
    padding: 1.5rem;
    background: white;
}

/* Loading Animation */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* Alert Styles */
.alert {
    border-radius: var(--border-radius);
    border: none;
    padding: 1rem 1.5rem;
}

.alert-success {
    background: linear-gradient(45deg, var(--success-color), #157347);
    color: white;
}

.alert-danger {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    color: white;
}

/* Footer */
footer {
    background: var(--dark-color) !important;
}

footer .hover-primary:hover {
    color: var(--primary-color) !important;
    transition: var(--transition);
}

footer a:hover {
    color: var(--primary-color) !important;
    transition: var(--transition);
}

/* Utility Classes */
.text-gradient {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

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

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.8s ease-in-out;
}

.slide-up {
    animation: slideUp 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);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        padding: 2rem 0;
        text-align: center;
    }
    
    .display-4 {
        font-size: 2.2rem;
        line-height: 1.2;
    }
    
    .lead {
        font-size: 1.1rem;
        margin-bottom: 2rem;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .btn-lg {
        padding: 1rem 2rem;
        font-size: 1.1rem;
    }
    
    .card-body {
        padding: 1.5rem;
    }
    
    .feature-icon {
        height: 60px;
        margin-bottom: 1rem;
    }
    
    .step-number {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
    
    .navbar-nav {
        text-align: center;
        padding: 1rem 0;
    }
    
    .input-group-lg .form-control {
        font-size: 1rem;
    }
    
    /* Footer responsive improvements */
    footer .col-lg-4 {
        text-align: center;
        margin-bottom: 1.5rem;
    }
    
    footer ul {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    footer ul li {
        margin: 0;
    }
}

@media (max-width: 576px) {
    .hero-section {
        padding: 1rem 0;
    }
    
    .display-4 {
        font-size: 1.8rem;
        margin-bottom: 1rem;
    }
    
    .lead {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }
    
    .btn-lg {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .input-group-lg .input-group-text,
    .input-group-lg .form-control {
        padding: 0.75rem;
        font-size: 0.9rem;
    }
    
    .form-select, .form-control {
        font-size: 0.9rem;
    }
    
    /* Better spacing for mobile */
    .py-5 {
        padding-top: 2rem !important;
        padding-bottom: 2rem !important;
    }
    
    .mb-5 {
        margin-bottom: 2rem !important;
    }
    
    /* Footer mobile improvements */
    footer {
        padding: 2rem 0 !important;
    }
    
    footer .row > div {
        margin-bottom: 1rem;
    }
    
    footer ul {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }
    
    footer ul li a {
        display: block;
        padding: 0.25rem 0;
    }
}

/* High Performance CSS */
.gpu-accelerated {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000;
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .card {
        background: #2d3748;
        color: white;
    }
    
    .form-control, .form-select {
        background: #4a5568;
        color: white;
        border-color: #718096;
    }
    
    .accordion-button {
        background: #4a5568;
        color: white;
    }
}

/* Print Styles */
@media print {
    .navbar, footer, #converter {
        display: none;
    }
    
    .hero-section {
        background: white;
        color: black;
        min-height: auto;
    }
}

/* Enhanced Button States */
.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
}

.btn:disabled:hover {
    transform: none !important;
    box-shadow: none !important;
}

/* Loading Spinner for Bootstrap */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* Enhanced Alert Styles */
.alert {
    border-left: 4px solid;
    border-radius: var(--border-radius);
    animation: slideInRight 0.3s ease-out;
}

.alert-success {
    border-left-color: var(--success-color);
    background-color: rgba(25, 135, 84, 0.1);
    /* color: var(--success-color); */
}

.alert-danger {
    border-left-color: var(--primary-color);
    background-color: rgba(220, 53, 69, 0.1);
    color: var(--primary-color);
}

#progressText {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--success-color);
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Video Thumbnail Styling */
.video-thumbnail {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.video-thumbnail:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

/* Result Container Animation */
/* #resultContainer { */
    /* animation: fadeInUp 0.5s ease-out; */
/* } */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Progress Container Styling */
#progressContainer {
    animation: fadeIn 0.3s ease-out;
}

/* Download Button Hover Effects */
.btn-light:hover {
    background-color: #f8f9fa;
    border-color: #f8f9fa;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Input Group Enhancements */
.input-group .btn {
    border-left: none;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

/* Animate In Class */
.animate-in {
    animation: slideUp 0.6s ease-out;
}

/* Responsive Design Enhancements */
@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 0;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .lead {
        font-size: 1rem;
    }
    
    .btn {
        padding: 0.6rem 1.5rem;
    }
    
    .btn-lg {
        padding: 0.8rem 2rem;
        font-size: 1rem;
    }
    
    .card-body {
        padding: 1.5rem;
    }
    
    .feature-icon {
        margin-bottom: 1rem;
    }
    
    .step-number {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
    
    .navbar-nav {
        text-align: center;
    }
    
    .input-group-lg .form-control {
        font-size: 1rem;
    }
    
    footer .col-lg-4 {
        text-align: center;
    }
    
    footer ul {
        padding-left: 0;
        list-style: none;
    }
    
    footer ul li {
        display: inline-block;
        margin: 0 1rem;
    }
}

@media (max-width: 576px) {
    .hero-section {
        padding: 2rem 0;
    }
    
    .display-4 {
        font-size: 1.75rem;
    }
    
    .lead {
        font-size: 0.95rem;
    }
    
    .btn-lg {
        padding: 0.75rem 1.75rem;
        font-size: 0.95rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .input-group-lg .input-group-text,
    .input-group-lg .form-control,
    .input-group-lg .btn {
        font-size: 0.95rem;
    }
    
    .form-select, .form-control {
        font-size: 0.9rem;
    }
    
    .py-5 {
        padding-top: 2rem !important;
        padding-bottom: 2rem !important;
    }
    
    .mb-5 {
        margin-bottom: 2rem !important;
    }
    
    footer {
        padding: 2rem 0;
    }
    
    footer .row > div {
        margin-bottom: 1.5rem;
    }
    
    footer ul {
        text-align: center;
        margin-bottom: 1rem;
    }
    
    footer ul li {
        display: block;
        margin: 0.5rem 0;
    }
    
    footer ul li a {
        font-size: 0.9rem;
    }
}

/* GPU Acceleration */
.gpu-accelerated {
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .card {
        background-color: #2d3436;
        color: #ddd;
    }
    
    .form-control, .form-select {
        background-color: #2d3436;
        border-color: #636e72;
        color: #ddd;
    }
    
    .accordion-button {
        background-color: #2d3436;
        color: #ddd;
    }
}

/* Print Styles */
@media print {
    .navbar, footer, #converter {
        display: none;
    }
    
    .hero-section {
        background: none;
        color: black;
    }
}