/* --- layout.css --- */

/* Site Header */
.site-header {
    background-color: var(--background-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    display: flex;
    align-items: center;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    flex-wrap: wrap;
    gap: 12px;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.navbar-brand:hover {
    color: var(--secondary-color);
    text-decoration: none;
}

.navbar-nav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
    gap: calc(var(--spacing-unit) * 2);
}

.navbar-collapse {
    display: flex;
    align-items: center;
    margin-left: auto;
}

.navbar-nav li {
    margin-left: 0;
}

.navbar-nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    padding: calc(var(--spacing-unit)) 0;
    position: relative;
}

.navbar-nav a:not(.disabled):hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.theme-switch {
    margin-left: calc(var(--spacing-unit) * 2);
}

.nav-theme-mobile {
    display: none;
}

.desktop-only {
    display: inline-flex;
}

.nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(4px);
    z-index: 900;
    opacity: 0;
    transition: opacity 0.2s ease;
}

body.nav-open .nav-overlay {
    display: block;
    opacity: 1;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: rgba(0,0,0,0.02);
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-color);
    margin: 5px auto;
    border-radius: 2px;
}

body.nav-open {
    overflow: hidden;
}

/* Main Content */
main {
    padding-top: 0; /* Header is sticky */
    position: relative;
    z-index: 1;
}

main::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.06) 0%, rgba(0, 0, 0, 0.16) 40%, rgba(0, 0, 0, 0.2) 100%);
    mix-blend-mode: multiply;
    opacity: 0.55;
    pointer-events: none;
    z-index: 0;
}

main > * {
    position: relative;
    z-index: 1;
}

.section-padding {
    padding: calc(var(--spacing-unit) * 8) 0;
    background: transparent;
}

.section-title {
    margin-bottom: calc(var(--spacing-unit) * 6);
    text-shadow: 0 0 10px var(--glow-orange);
}

.section-subtitle {
    max-width: 600px;
    margin: 0 auto calc(var(--spacing-unit) * 4) auto;
}

/* Grid System */
.grid-2, .grid-3 {
    display: grid;
    gap: calc(var(--spacing-unit) * 4);
}

.grid-2 {
    grid-template-columns: 1fr;
}

.grid-3 {
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}


/* Footer */
.site-footer {
    background: var(--background-color);
    color: var(--color-text-primary);
    padding: calc(var(--spacing-unit) * 5) 0;
    border-top: 1px solid var(--border-color);
}

.site-footer a {
    color: var(--color-link);
}

.site-footer a:hover {
    color: var(--color-link-hover);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: calc(var(--spacing-unit) * 4);
    margin-bottom: calc(var(--spacing-unit) * 4);
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .footer-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.footer-column h4 {
    color: var(--background-color);
    margin-bottom: var(--spacing-unit);
}

.footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-column ul li {
    margin-bottom: var(--spacing-unit);
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid var(--border-color);
    padding-top: calc(var(--spacing-unit) * 2);
    font-size: 0.9em;
}


/* Responsive Navigation */
@media (max-width: 991.98px) {
    .theme-switch {
        order: 2;
        margin-left: auto;
    }

    .desktop-only {
        display: none;
    }

    .nav-toggle {
        display: block;
        z-index: 1001;
        order: 3;
    }

    .navbar-collapse {
        display: block;
        position: fixed;
        top: 0;
        right: 0;
        width: 300px;
        height: 100%;
        background-color: var(--background-color);
        box-shadow: -2px 0 5px rgba(0,0,0,0.1);
        transition: transform 0.3s ease-in-out, box-shadow 0.3s ease;
        transform: translateX(100%);
        padding-top: var(--header-height);
        order: 4;
        z-index: 950;
    }

    .navbar-collapse.is-open {
        transform: translateX(0);
    }

    .navbar-nav {
        flex-direction: column;
        align-items: flex-start;
        padding: calc(var(--spacing-unit) * 2);
        gap: 0;
    }

    .navbar-nav li {
        margin: 0;
        width: 100%;
    }

    .navbar-nav a {
        display: block;
        padding: calc(var(--spacing-unit) * 2);
        width: 100%;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-theme-mobile {
        display: block;
        width: 100%;
        padding: calc(var(--spacing-unit) * 2) 0;
    }
}