/* Main CSS for Trang Chu */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #667eea;
    --text-dark: #2c3e50;
    --text-light: #ecf0f1;
    --bg-light: #f8f9fa;
    --border-color: #e0e0e0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #ffffff;
    color: var(--text-dark);
    line-height: 1.6;
}

/* Top Navigation Menu */
.top-nav {
    background: var(--primary-color);
    color: var(--text-light);
    padding: 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 0;
    font-size: 1.3em;
    font-weight: 700;
    text-decoration: none;
    color: var(--text-light);
}

.logo:hover {
    opacity: 0.9;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0;
    align-items: center;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    display: block;
    padding: 20px 20px;
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.nav-menu a:hover {
    background: rgba(255,255,255,0.1);
    border-bottom-color: var(--accent-color);
}

.nav-menu a.active {
    background: rgba(255,255,255,0.1);
    border-bottom-color: var(--accent-color);
    font-weight: 600;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: 1.5em;
    cursor: pointer;
    padding: 10px;
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 40px 20px;
}

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

/* Footer */
.footer {
    background: var(--primary-color);
    color: var(--text-light);
    padding: 30px 20px;
    text-align: center;
    margin-top: 60px;
}

.footer p {
    margin: 5px 0;
    opacity: 0.9;
}

/* Responsive */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--primary-color);
        flex-direction: column;
        display: none;
        box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    }

    .nav-menu.open {
        display: flex;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-menu a {
        padding: 15px 20px;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .main-content {
        padding: 20px 15px;
    }
}

/* Common Styles */
.section-title {
    font-size: 2em;
    color: var(--text-dark);
    margin-bottom: 30px;
    text-align: center;
    font-weight: 600;
}

.loading {
    text-align: center;
    padding: 40px 20px;
    color: var(--accent-color);
}

.error {
    text-align: center;
    padding: 40px 20px;
    color: #dc3545;
}

/* Coming Soon / Under Development */
.coming-soon {
    text-align: center;
    padding: 100px 20px;
    min-height: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.coming-soon-icon {
    font-size: 80px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.coming-soon h2 {
    font-size: 2em;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.coming-soon p {
    font-size: 1.1em;
    color: #666;
    font-style: italic;
}