/* Base Styles */
:root {
    --primary-color: #6cc575;
    --secondary-color: #8a4b8a;
    --accent-color: #4bb6d8;
    --dark-accent: #3a8ba8;
    --text-color: #333;
    --light-text: #fff;
    --border-color: #e1e1e1;
    --bg-color: #f9f9f9;
    --error-color: #e74c3c;
    --success-color: #2ecc71;
}

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    background-color: var(--bg-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: var(--primary-color);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Contact Form Styles */
.contact-form {
    max-width: 600px;
    margin: 30px auto;
    padding: 30px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1em;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(75, 182, 216, 0.2);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.error-message {
    color: var(--error-color);
    font-size: 0.85em;
    margin-top: 5px;
    display: none;
}

.has-error input,
.has-error textarea {
    border-color: var(--error-color);
}

.has-error input:focus,
.has-error textarea:focus {
    box-shadow: 0 0 0 2px rgba(231, 76, 60, 0.2);
}

.success-message {
    padding: 15px;
    margin: 20px 0;
    border-radius: 4px;
    display: none;
    background-color: rgba(46, 204, 113, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(46, 204, 113, 0.3);
}

.button {
    display: inline-block;
    background: var(--accent-color);
    color: #fff;
    padding: 12px 25px;
    border: none;
    border-radius: 4px;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.button:hover {
    background: var(--dark-accent);
    transform: translateY(-2px);
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.button:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
    margin-right: 8px;
    vertical-align: middle;
}

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

/* Top Bar */
.top-bar {
    background-color: #2a2a2a;
    padding: 12px 0;
    font-size: 0.9em;
}

.top-bar-content {
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.social-icons {
    display: flex;
    gap: 15px;
}

.social-icon {
    color: #bbb;
    font-size: 16px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.social-icon:hover {
    color: white;
    background-color: var(--accent-color);
    transform: translateY(-2px);
}

/* Header */
.main-header {
    background-color: #fff;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    max-height: 70px;
    transition: transform 0.3s ease;
}

.logo img:hover {
    transform: scale(1.03);
}

/* Navigation */
.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.main-nav li {
    position: relative;
    margin-left: 15px;
}

.main-nav > ul > li > a {
    font-weight: 600;
    padding: 10px 15px;
    border-radius: 4px;
    color: #444;
}

.main-nav > ul > li > a:hover {
    background-color: rgba(108, 197, 117, 0.1);
    color: var(--primary-color);
}

.main-nav > ul > li > a.active {
    background-color: rgba(108, 197, 117, 0.2);
    color: var(--primary-color);
}

.main-nav .menu-item-has-children > a::after {
    content: "▾";
    font-size: 0.7em;
    margin-left: 6px;
    vertical-align: middle;
}

.sub-menu {
    display: none !important;
    position: absolute;
    background: #fff;
    min-width: 220px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-radius: 6px;
    z-index: 100;
    padding: 8px 0;
    left: 0;
    top: 100%;
}

.sub-menu li {
    margin: 0;
}

.sub-menu a {
    display: block;
    padding: 10px 20px;
    color: #555;
    font-size: 0.95em;
}

.sub-menu a:hover {
    background-color: var(--primary-color);
    color: white;
}

.mobile-menu-toggle {
    display: none;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 4px;
    font-size: 15px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.mobile-menu-toggle:hover {
    background: var(--secondary-color);
}

/* Desktop hover behavior */
@media (min-width: 769px) {
    .menu-item-has-children:hover .sub-menu {
        display: block !important;
        animation: fadeIn 0.3s ease;
    }
}

/* Content */
.content {
    background: #fff;
    padding: 40px 0;
    box-shadow: 0 0 15px rgba(0,0,0,0.05);
}

.page-content {
    max-width: 1200px;
    margin: 0 auto;
}

.page-title {
    color: var(--secondary-color);
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 10px;
    font-size: 2.2em;
}

.page-title::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--accent-color);
}

/* Home Page Styles */
.intro-container {
    display: flex;
    gap: 40px;
    margin-bottom: 50px;
    align-items: center;
}

.featured-image {
    flex: 1;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.featured-image img {
    width: 100%;
    height: auto;
    display: block;
}

.intro-text {
    flex: 1;
}

.intro-text h1 {
    color: var(--secondary-color);
    margin-top: 0;
    margin-bottom: 20px;
}

.intro-text p {
    margin-bottom: 20px;
    font-size: 1.1em;
    line-height: 1.7;
    color: #444;
}

.lectures-section {
    margin-top: 50px;
}

.lectures-section h2 {
    color: var(--secondary-color);
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 10px;
    font-size: 1.8em;
}

.lectures-section h2::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--accent-color);
}

.lectures-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 20px;
}

.lecture-card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
    background: #fff;
}

.lecture-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    border-color: var(--primary-color);
}

.lecture-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid var(--border-color);
}

.lecture-info {
    padding: 20px;
}

.lecture-info h3 {
    margin: 0 0 10px;
    color: var(--secondary-color);
    font-size: 1.2em;
}

.lecture-info p {
    margin: 0 0 15px;
    color: #666;
    font-size: 0.95em;
}

.button {
    display: inline-block;
    background: var(--accent-color);
    color: #fff;
    padding: 8px 18px;
    border-radius: 4px;
    font-size: 0.9em;
    transition: all 0.3s ease;
    font-weight: 500;
}

.button:hover {
    background: var(--dark-accent);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

/* Footer */
.main-footer {
    background: #2a2a2a;
    color: #eee;
    padding: 40px 0 30px;
    margin-top: 50px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.footer-section {
    flex: 1;
    min-width: 250px;
    margin-bottom: 20px;
}

.footer-section h3 {
    color: #fff;
    margin: 0 0 20px;
    font-size: 1.1em;
}

.footer-section p, .footer-section a {
    color: #bbb;
    font-size: 0.95em;
}

.footer-section a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.newsletter-form label {
    display: block;
    margin-bottom: 8px;
    color: #ddd;
    font-size: 0.95em;
}

.newsletter-form input[type="email"] {
    width: 100%;
    padding: 10px;
    margin: 0 0 12px;
    border: 1px solid #444;
    border-radius: 4px;
    background: #333;
    color: #fff;
    font-size: 0.95em;
}

.newsletter-form button {
    background: var(--accent-color);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.95em;
    transition: background 0.3s ease;
}

.newsletter-form button:hover {
    background: var(--dark-accent);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 900px) {
    .intro-container {
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: row;
        align-items: center;
    }
    
    .main-nav {
        display: none;
        width: 100%;
        margin-top: 20px;
        background: #fff;
        padding: 15px;
        border-radius: 6px;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
    }
    
    .main-nav li {
        margin: 5px 0;
    }
    
    .main-nav > ul > li > a {
        display: block;
        padding: 12px 15px;
    }
    
    .sub-menu {
        position: static;
        box-shadow: none;
        display: none;
        padding-left: 15px;
        background: rgba(0,0,0,0.03);
        margin-top: 5px;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .intro-container {
        flex-direction: column;
    }
    
    .featured-image {
        margin-bottom: 30px;
    }
    
    .lectures-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .top-bar {
        font-size: 0.8em;
    }
    
    .logo img {
        max-height: 60px;
    }
    
    .mobile-menu-toggle {
        padding: 7px 12px;
        font-size: 14px;
    }
    
    .intro-text h1 {
        font-size: 1.8em;
    }
    
    .lectures-section h2 {
        font-size: 1.5em;
    }

    .contact-form {
        padding: 20px;
    }
}