/* --- LAYOUT.CSS --- */
/* Structural Layout Styles */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container--narrow {
    max-width: 800px;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

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

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

.grid--4-cols {
    grid-template-columns: 1fr;
}

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

    .grid--3-cols {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid--4-cols {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .grid--3-cols {
        grid-template-columns: repeat(3, 1fr);
    }

    .grid--4-cols {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Header & Nav */
.header {
    background-color: var(--color-bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 900;
    width: 100%;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    min-height: 80px;
}

.nav__brand {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav__brand-abbr {
    color: var(--color-accent);
}

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

.nav__link {
    font-weight: 500;
    color: var(--color-text-main);
    padding: var(--spacing-xs) 0;
    border-bottom: 2px solid transparent;
}

.nav__link:hover,
.nav__link--active {
    color: var(--color-primary);
    border-bottom-color: var(--color-accent);
}

.nav__toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav__toggle-icon {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-primary);
    position: relative;
    transition: background-color var(--transition-fast);
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
    left: 0;
    transition: transform var(--transition-fast);
}

.nav__toggle-icon::before {
    top: -8px;
}

.nav__toggle-icon::after {
    bottom: -8px;
}

@media (max-width: 1023px) {
    .nav__toggle {
        display: block;
    }

    .nav__menu {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--color-bg-white);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-md);
        gap: var(--spacing-sm);
        transform: translateY(-10px);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

    .nav__menu.is-active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
}

/* Sections */
.section {
    padding: var(--spacing-xxl) 0;
}

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

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

.section--bg-primary h2,
.section--bg-primary h3,
.section--bg-primary p {
    color: var(--color-bg-white);
}

.section__header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
}

/* Footer */
.footer {
    background-color: var(--color-primary);
    color: #a0aec0;
    padding: var(--spacing-xxl) 0 var(--spacing-md);
}

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

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

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

.footer__brand h3 {
    color: var(--color-bg-white);
    margin-bottom: var(--spacing-xs);
}

.footer__title {
    color: var(--color-bg-white);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.footer__list {
    list-style: none;
}

.footer__list-item {
    margin-bottom: var(--spacing-xs);
}

.footer__link {
    color: #a0aec0;
}

.footer__link:hover {
    color: var(--color-accent);
}

.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
    text-align: center;
    font-size: 0.875rem;
}

@media (min-width: 768px) {
    .footer__bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}