/**
 * Layout CSS
 *
 * Grid and Flexbox structures, containers, and responsive breakpoints.
 *
 * @package Groupetto_2026
 */

/* ==========================================================================
   Container
   ========================================================================== */

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin-inline: auto;
    padding-inline: var(--container-padding);
}

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

.container--wide {
    max-width: 1400px;
}

.container--full {
    max-width: none;
    padding-inline: 0;
}

/* ==========================================================================
   Section Base
   ========================================================================== */

.section {
    padding-block: var(--section-padding-y);
    padding-inline: var(--section-padding-x);
}

.section--no-padding-top {
    padding-top: 0;
}

.section--no-padding-bottom {
    padding-bottom: 0;
}

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

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

.section--bg-dark .section__title,
.section--bg-dark .section__subtitle {
    color: var(--color-bg);
}

.section__header {
    max-width: 700px;
    margin-inline: auto;
    margin-bottom: var(--space-3xl);
    text-align: center;
}

.section__title {
    margin-bottom: var(--space-md);
}

.section__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
}

/* ==========================================================================
   Header Layout
   ========================================================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    height: var(--header-height);
    background-color: transparent;
    transition: background-color var(--transition-base),
                height var(--transition-base),
                box-shadow var(--transition-base);
}

.site-header.is-scrolled {
    height: var(--header-height-scrolled);
    background-color: var(--color-bg);
    box-shadow: var(--shadow-md);
}

.dark-mode .site-header.is-scrolled {
    background-color: var(--color-bg-alt);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    gap: var(--space-lg);
}

/* Logo */
.site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-xl);
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.site-logo:hover {
    color: var(--color-primary);
}

.logo-text {
    font-weight: var(--font-weight-black);
    letter-spacing: var(--letter-spacing-tight);
}

/* Main Navigation */
.main-nav {
    display: none;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    position: relative;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--color-text);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link--cta {
    padding: var(--space-sm) var(--space-lg);
    background-color: var(--color-primary);
    color: white;
    border-radius: var(--border-radius-full);
    transition: background-color var(--transition-fast),
                transform var(--transition-fast);
}

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

.nav-link--cta:hover {
    background-color: var(--color-primary-dark);
    color: white;
    transform: translateY(-2px);
}

/* Language Switcher */
.lang-switch {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.lang-switch__link {
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
    padding: var(--space-xs);
}

.lang-switch__link:hover {
    color: var(--color-text);
}

.lang-switch__link.is-active {
    color: var(--color-primary);
}

.lang-switch__divider {
    color: var(--color-text-muted);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    z-index: calc(var(--z-fixed) + 1);
}

.hamburger {
    position: relative;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: background-color var(--transition-fast);
}

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

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    bottom: -8px;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger {
    background-color: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
    transform: translateY(8px) rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
    transform: translateY(-8px) rotate(-45deg);
}

/* ==========================================================================
   Footer Layout (Dark Theme)
   ========================================================================== */

.site-footer {
    background-color: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    color: var(--color-text);
    padding-block: var(--space-3xl) var(--space-xl);
}

.footer-inner {
    display: grid;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-brand .logo-text {
    font-size: var(--font-size-2xl);
    color: var(--color-text);
    margin-bottom: var(--space-sm);
    display: block;
}

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

.footer-nav {
    /* Navigation styles */
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md) var(--space-xl);
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

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

.footer-social {
    display: flex;
    gap: var(--space-md);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-full);
    color: var(--color-text-light);
    background-color: rgba(255, 255, 255, 0.1);
    transition: background-color var(--transition-fast),
                color var(--transition-fast);
}

.social-link:hover {
    background-color: var(--color-primary);
    color: white;
}

.footer-bottom {
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.copyright {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
}

/* ==========================================================================
   Grid Utilities
   ========================================================================== */

.grid {
    display: grid;
    gap: var(--space-xl);
}

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

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

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

/* ==========================================================================
   Flex Utilities
   ========================================================================== */

.flex {
    display: flex;
}

.flex--center {
    align-items: center;
    justify-content: center;
}

.flex--between {
    align-items: center;
    justify-content: space-between;
}

.flex--column {
    flex-direction: column;
}

.flex--wrap {
    flex-wrap: wrap;
}

.gap-sm {
    gap: var(--space-sm);
}

.gap-md {
    gap: var(--space-md);
}

.gap-lg {
    gap: var(--space-lg);
}

.gap-xl {
    gap: var(--space-xl);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) {
    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
    .main-nav {
        display: block;
    }

    .mobile-menu-toggle {
        display: none;
    }

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

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

    .footer-inner {
        grid-template-columns: 2fr 1fr 1fr;
        align-items: start;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--space-sm);
    }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
    :root {
        --container-padding: var(--space-xl);
    }

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

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

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    :root {
        --container-padding: var(--space-2xl);
    }
}

/* ==========================================================================
   Mobile Navigation Overlay
   ========================================================================== */

@media (max-width: 767px) {
    .main-nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        background-color: var(--color-bg);
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-base),
                    visibility var(--transition-base);
        z-index: var(--z-fixed);
    }

    .main-nav.is-open {
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        gap: var(--space-xl);
    }

    .nav-link {
        font-size: var(--font-size-2xl);
    }

    body.menu-open {
        overflow: hidden;
    }
}