/* Layout and Structure */

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

/* Header */
header {
    background-color: var(--color-background);
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

/* Navigation */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: var(--font-size-logo);
    font-weight: 800;
    color: var(--color-primary);
    text-decoration: none;
    margin: -20px 0;
    padding: 0;
}

.nav-links {
    display: flex;
    gap: var(--spacing-2xl);
}

.nav-links li a {
    color: var(--color-text);
    font-weight: var(--font-weight-normal);
    transition: color var(--transition-normal);
    position: relative;
}

.nav-links li a:hover,
.nav-links li a.active {
    color: var(--color-primary);
    text-decoration: none;
}

.nav-links li a.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-primary);
}

/* Main content */
main {
    padding: var(--spacing-2xl) 0;
    min-height: 60vh;
}

/* Page content management */
.page-content {
    display: none;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.page-content.active {
    display: block;
    opacity: 1;
}

.page-content.active h1 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.page-content.active h2 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

/* Footer */
footer {
    background-color: var(--color-footer-bg);
    color: var(--color-footer-text);
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-3xl);
}

footer p {
    margin-bottom: 0;
    font-size: var(--font-size-small);
}

/* Utility classes */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mb-0 {
    margin-bottom: 0 !important;
}

.mb-1 {
    margin-bottom: var(--spacing-sm) !important;
}

.mb-2 {
    margin-bottom: var(--spacing-md) !important;
}

.mb-3 {
    margin-bottom: var(--spacing-lg) !important;
}

.mt-0 {
    margin-top: 0 !important;
}

.mt-1 {
    margin-top: var(--spacing-sm) !important;
}

.mt-2 {
    margin-top: var(--spacing-md) !important;
}

.mt-3 {
    margin-top: var(--spacing-lg) !important;
}

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}