/* Custom CSS for English Course Website */

:root {
    --primary-color: #0d6efd;
    --primary-dark: #0b5ed7;
    --primary-light: #6ea8fe;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --white-color: #ffffff;
    
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --transition: all 0.3s ease;
    --border-radius: 0.5rem;
    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --box-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
}

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

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--dark-color);
    scroll-behavior: smooth;
}

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

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

.nav-link {
    font-weight: 500;
    color: var(--dark-color) !important;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color) !important;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    background-color: var(--primary-color);
    transition: var(--transition);
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 100%;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background-image: url('../images/hero-background.svg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(13, 110, 253, 0.8) 0%, rgba(11, 94, 215, 0.9) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-buttons {
    margin-top: 2rem;
}

.hero-buttons .btn {
    margin-right: 1rem;
    margin-bottom: 1rem;
    padding: 0.75rem 2rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.hero-image {
    position: relative;
    z-index: 2;
    animation: fadeInRight 1s ease-out 0.3s both;
}

.hero-image img {
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-lg);
}

/* Program Cards */
.program-card {
    transition: var(--transition);
    border: none;
    border-radius: var(--border-radius);
    overflow: hidden;
    height: 100%;
}

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

.card-img-wrapper {
    position: relative;
    overflow: hidden;
    height: 250px;
}

.card-img-top {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.program-card:hover .card-img-top {
    transform: scale(1.1);
}

.program-icon {
    font-size: 2rem;
}

.card-title {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* Advantages Section */
.advantages-list {
    padding: 2rem 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 100%;
}

.advantage-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--white-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.advantage-item:hover {
    transform: translateX(10px);
    box-shadow: var(--box-shadow-lg);
}

.advantage-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1.5rem;
    flex-shrink: 0;
}

.advantage-icon i {
    font-size: 1.5rem;
    color: var(--white-color);
}

.advantage-content h5 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.advantage-image {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.advantage-image img {
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-lg);
    width: 100%;
    height: auto;
    max-height: 500px;
    object-fit: cover;
    object-position: center;
}

/* Registration Section */
.registration-card {
    margin: 4rem 0;
}

.registration-card .card {
    border-radius: var(--border-radius);
    overflow: hidden;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.form-label {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
    font-weight: 600;
    transition: var(--transition);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
}

/* WhatsApp Float Button */
.whatsapp-float {
    position: fixed;
    width: 60px;
    height: 60px;
    bottom: 40px;
    right: 40px;
    background-color: #25d366;
    color: var(--white-color);
    border-radius: 50%;
    text-align: center;
    font-size: 30px;
    box-shadow: var(--box-shadow-lg);
    z-index: 1000;
    animation: pulse 2s infinite;
}

.whatsapp-button {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white-color);
    text-decoration: none;
    transition: var(--transition);
}

.whatsapp-button:hover {
    color: var(--white-color);
    transform: scale(1.1);
}

/* Footer */
footer {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)) !important;
}

footer a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

footer a:hover {
    color: var(--white-color);
}

.social-links a {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    text-align: center;
    line-height: 40px;
    transition: var(--transition);
}

.social-links a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-section {
        background-attachment: scroll;
    }
    
    .hero-buttons .btn {
        display: block;
        width: 100%;
        margin-right: 0;
        margin-bottom: 1rem;
    }
    
    .advantage-item {
        flex-direction: column;
        text-align: center;
    }
    
    .advantage-icon {
        margin-right: 0;
        margin-bottom: 1rem;
    }
    
    .whatsapp-float {
        width: 50px;
        height: 50px;
        bottom: 20px;
        right: 20px;
        font-size: 24px;
    }
    
    .card-img-wrapper {
        height: 200px;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .display-5 {
        font-size: 2rem;
    }
}

/* Scroll Animations */
.animate-in {
    animation: slideInUp 0.6s ease-out forwards;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Back to Top Button Styles */
.back-to-top {
    position: fixed;
    bottom: 120px;
    right: 40px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

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

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

/* Image Loading States */
img {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img.loaded {
    opacity: 1;
}

/* Alert Styles */
.alert {
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
}

.alert-success {
    background: rgba(25, 135, 84, 0.1);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background: rgba(220, 53, 69, 0.1);
    color: var(--danger-color);
    border-left: 4px solid var(--danger-color);
}

/* Form Validation States */
.was-validated .form-control:invalid,
.was-validated .form-select:invalid {
    border-color: var(--danger-color);
}

.was-validated .form-control:valid,
.was-validated .form-select:valid {
    border-color: var(--success-color);
}

.invalid-feedback {
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.valid-feedback {
    color: var(--success-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}