/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0066cc;
    --secondary-color: #00a8e8;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --text-color: #333;
    --border-color: #ddd;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-lg: 0 5px 20px rgba(0,0,0,0.15);
}

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    overflow-x: hidden;
}

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

.section {
    padding: 60px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
    position: relative;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--dark-color);
    margin-bottom: 10px;
}

.section-header p {
    font-size: 1.1rem;
    color: #666;
}

.section-header .view-all {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: 0.3s;
}

.section-header .view-all:hover {
    color: var(--secondary-color);
}

.bg-light {
    background-color: #f8f9fa;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: 0.3s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
}

.btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-white {
    background-color: white;
    color: var(--primary-color);
}

.btn-white:hover {
    background-color: #f8f9fa;
}

.btn-sm {
    padding: 8px 20px;
    font-size: 0.9rem;
}

/* Header */
.header {
    background-color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--primary-color);
}

.logo i {
    font-size: 3rem;
}

.logo h1 {
    font-size: 1.3rem;
    font-weight: 700;
    line-height: 1.2;
}

.logo p {
    font-size: 0.9rem;
    color: #666;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: 0.3s;
    position: relative;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--primary-color);
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: 0.3s;
}

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary-color);
    cursor: pointer;
}

/* Hero Slider */
.hero-slider {
    position: relative;
    height: 600px;
    overflow: hidden;
}

.slider-container {
    height: 100%;
    position: relative;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 0.5s;
}

.slide.active {
    opacity: 1;
}

.slide::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
}

.slide-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: white;
    z-index: 2;
    width: 90%;
    max-width: 800px;
}

.slide-content h2 {
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.slide-content p {
    font-size: 1.3rem;
    margin-bottom: 30px;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}

.slider-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(255, 255, 255, 0.3);
    color: white;
    border: none;
    padding: 15px 20px;
    cursor: pointer;
    font-size: 1.5rem;
    transition: 0.3s;
    z-index: 3;
}

.slider-nav:hover {
    background-color: rgba(255, 255, 255, 0.5);
}

.slider-nav.prev {
    left: 20px;
}

.slider-nav.next {
    right: 20px;
}

.slider-dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 3;
}

.slider-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: 0.3s;
}

.slider-dot.active {
    background-color: white;
    width: 30px;
    border-radius: 6px;
}

/* Program Introduction */
.intro-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.intro-text h3 {
    font-size: 2rem;
    color: var(--dark-color);
    margin-bottom: 20px;
}

.intro-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #555;
    margin-bottom: 30px;
}

.features {
    display: grid;
    gap: 20px;
}

.feature-item {
    display: flex;
    gap: 15px;
    align-items: flex-start;
}

.feature-item i {
    font-size: 2rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

.feature-item h4 {
    font-size: 1.2rem;
    color: var(--dark-color);
    margin-bottom: 5px;
}

.feature-item p {
    color: #666;
    margin: 0;
}

.intro-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    color: white;
    box-shadow: var(--shadow);
    transition: 0.3s;
}

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

.stat-card i {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.8;
}

.stat-card h3 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.stat-card p {
    font-size: 1rem;
    opacity: 0.9;
}

/* News Section */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.news-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: 0.3s;
    cursor: pointer;
}

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

.news-card-image {
    width: 100%;
    height: 220px;
    background-size: cover;
    background-position: center;
    position: relative;
}

.news-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
}

.news-badge.featured {
    background-color: var(--danger-color);
}

.news-card-content {
    padding: 20px;
}

.news-meta {
    display: flex;
    gap: 15px;
    font-size: 0.85rem;
    color: #999;
    margin-bottom: 10px;
}

.news-meta i {
    margin-right: 5px;
}

.news-card h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--dark-color);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card p {
    color: #666;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Announcements Section */
.announcements-list {
    display: grid;
    gap: 20px;
}

.announcement-card {
    background: white;
    border-left: 4px solid var(--primary-color);
    padding: 20px;
    border-radius: 5px;
    box-shadow: var(--shadow);
    display: flex;
    gap: 20px;
    transition: 0.3s;
    cursor: pointer;
}

.announcement-card:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.announcement-card.priority-high {
    border-left-color: var(--danger-color);
}

.announcement-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.announcement-card.priority-high .announcement-icon {
    background-color: var(--danger-color);
}

.announcement-content {
    flex: 1;
}

.announcement-content h3 {
    font-size: 1.2rem;
    color: var(--dark-color);
    margin-bottom: 10px;
}

.announcement-meta {
    display: flex;
    gap: 20px;
    font-size: 0.85rem;
    color: #999;
    margin-bottom: 10px;
}

.announcement-meta i {
    margin-right: 5px;
}

/* Quick Register Section */
.quick-register-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.quick-register-text h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.quick-register-text p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.95;
}

.quick-register-text ul {
    list-style: none;
}

.quick-register-text li {
    font-size: 1.1rem;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.quick-register-text li i {
    font-size: 1.5rem;
}

.quick-register-form {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
}

.quick-register-form h3 {
    color: var(--primary-color);
    margin-bottom: 25px;
    font-size: 1.8rem;
}

.quick-register-form input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    margin-bottom: 15px;
    font-size: 1rem;
}

.quick-register-form input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.quick-register-form button {
    width: 100%;
}

.form-note {
    text-align: center;
    font-size: 0.85rem;
    color: #666;
    margin-top: 15px;
}

/* Banner Section */
.banner-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.banner-item {
    height: 300px;
    background-size: cover;
    background-position: center;
    border-radius: 10px;
    position: relative;
    overflow: hidden;
}

.banner-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
}

.banner-content {
    position: absolute;
    bottom: 30px;
    left: 30px;
    right: 30px;
    color: white;
    z-index: 2;
}

.banner-content h3 {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.banner-content p {
    margin-bottom: 15px;
    opacity: 0.9;
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.contact-item {
    display: flex;
    gap: 20px;
}

.contact-item i {
    font-size: 2rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 1.2rem;
    color: var(--dark-color);
    margin-bottom: 5px;
}

.contact-item p {
    color: #666;
    margin: 0;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    width: 45px;
    height: 45px;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 1.2rem;
    transition: 0.3s;
}

.social-links a:hover {
    background-color: var(--secondary-color);
    transform: scale(1.1);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    margin-bottom: 15px;
    font-family: inherit;
    font-size: 1rem;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.contact-form textarea {
    resize: vertical;
}

.contact-form button {
    width: 100%;
}

/* Footer */
.footer {
    background-color: var(--dark-color);
    color: white;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 1.3rem;
    margin-bottom: 20px;
}

.footer-col p {
    line-height: 1.8;
    opacity: 0.8;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: 0.3s;
}

.footer-col ul li a:hover {
    color: white;
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
}

/* Hotline Buttons */
.hotline-buttons {
    position: fixed;
    right: 30px;
    bottom: 30px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 999;
}

.hotline-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: var(--shadow-lg);
    transition: 0.3s;
    animation: pulse 2s infinite;
}

.hotline-btn:hover {
    transform: scale(1.1);
}

.hotline-btn.call {
    background-color: #28a745;
}

.hotline-btn.zalo {
    background-color: #0068ff;
}

.hotline-btn.facebook {
    background-color: #1877f2;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(40, 167, 69, 0.7);
    }
    50% {
        box-shadow: 0 0 0 15px rgba(40, 167, 69, 0);
    }
}

/* Chat Widget */
.chat-widget {
    position: fixed;
    bottom: 30px;
    right: 120px;
    width: 350px;
    background: white;
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
    display: none;
    flex-direction: column;
    z-index: 998;
}

.chat-widget.active {
    display: flex;
}

.chat-header {
    background-color: var(--primary-color);
    color: white;
    padding: 15px;
    border-radius: 10px 10px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h4 {
    margin: 0;
    font-size: 1.1rem;
}

.chat-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
}

.chat-body {
    height: 300px;
    padding: 20px;
    overflow-y: auto;
}

.chat-message {
    margin-bottom: 15px;
}

.chat-message.bot p {
    background-color: #f1f1f1;
    padding: 10px 15px;
    border-radius: 15px;
    display: inline-block;
}

.chat-footer {
    display: flex;
    padding: 15px;
    border-top: 1px solid var(--border-color);
}

.chat-footer input {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    margin-right: 10px;
}

.chat-footer button {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: 0.3s;
}

.chat-footer button:hover {
    background-color: var(--secondary-color);
}

.chat-toggle {
    position: fixed;
    bottom: 30px;
    right: 120px;
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: 0.3s;
    z-index: 997;
}

.chat-toggle:hover {
    background-color: var(--secondary-color);
    transform: scale(1.1);
}