/* ============================================
   Layout
   ============================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--spacing-2xl) 0;
}

.section-alt {
    background-color: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-tag {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.section-title {
    margin-bottom: var(--spacing-sm);
}

.section-divider {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    margin: var(--spacing-md) auto 0;
    border-radius: var(--radius-full);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

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

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

.nav-link.active::after {
    width: 80%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all var(--transition-base);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Submenu Styles
   ============================================ */
.nav-item.has-submenu {
    position: relative;
}

.nav-item.has-submenu > .nav-link {
    padding-right: var(--spacing-lg);
}

.nav-item.has-submenu > .nav-link::after {
    content: '▼';
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.6em;
    width: auto;
    height: auto;
    background: none;
    transition: transform var(--transition-fast);
}

.nav-item.has-submenu:hover > .nav-link::after,
.nav-item.has-submenu[aria-expanded="true"] > .nav-link::after {
    transform: translateY(-50%) rotate(180deg);
}

.nav-submenu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-base);
    z-index: 1001;
    list-style: none;
}

.nav-item.has-submenu:hover .nav-submenu,
.nav-item.has-submenu[aria-expanded="true"] .nav-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-submenu .nav-item {
    padding: 0;
}

.nav-submenu .nav-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    white-space: nowrap;
}

.nav-submenu .nav-link:hover,
.nav-submenu .nav-link.active {
    background-color: var(--bg-secondary);
    color: var(--primary);
}

.nav-submenu .nav-link::after {
    display: none;
}

/* Icon styles */
.nav-link i {
    margin-right: var(--spacing-xs);
    font-style: normal;
}

/* ============================================
   Mobile Navigation
   ============================================ */
@media (max-width: 767px) {
    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background-color: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0;
        max-height: calc(100vh - 60px);
        overflow-y: auto;
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-item {
        width: 100%;
        border-bottom: 1px solid var(--border);
    }
    
    .nav-item:last-child {
        border-bottom: none;
    }
    
    .nav-link {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: var(--spacing-md);
        width: 100%;
    }
    
    .nav-item.has-submenu > .nav-link::after {
        position: static;
        transform: none;
    }
    
    .nav-item.has-submenu[aria-expanded="true"] > .nav-link::after {
        transform: rotate(180deg);
    }
    
    .nav-submenu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
    }
    
    .nav-item.has-submenu[aria-expanded="true"] .nav-submenu {
        max-height: 500px;
    }
    
    .nav-submenu .nav-link {
        padding-left: var(--spacing-xl);
        background-color: var(--bg-secondary);
    }
    
    .nav-toggle {
        display: flex;
    }
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    border-top: 1px solid var(--border);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    text-align: center;
}

.footer-logo {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

.footer-tagline {
    margin-top: var(--spacing-xs);
    color: var(--text-secondary);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.footer-links-column h4 {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
}

.footer-links-column ul {
    list-style: none;
}

.footer-links-column li {
    margin-bottom: var(--spacing-xs);
}

.footer-links-column a {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.footer-links-column a:hover {
    color: var(--primary);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin: 0;
}

.footer-legal {
    display: flex;
    gap: var(--spacing-md);
}

.footer-legal a {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

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

/* ============================================
   Responsive Design
   ============================================ */
@media (min-width: 640px) {
    :root {
        --font-size-5xl: 3.5rem;
        --font-size-4xl: 3rem;
    }
}

@media (min-width: 768px) {
    .nav-toggle {
        display: none;
    }
    
    .nav-menu {
        display: flex;
    }
    
    .footer-content {
        grid-template-columns: 1fr 2fr;
    }
    
    .footer-brand {
        text-align: left;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}