/*
 * Exam Analytics (Beta) v1.0.0
 * Layout Styles: Grid, Flex, Responsive Utilities
 */

/* ==================== Container ==================== */
.container {
    width: 100%;
    max-width: var(--max-width-xl);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-4);
    padding-right: var(--space-4);
}

.container-sm {
    max-width: var(--max-width-sm);
}

.container-md {
    max-width: var(--max-width-md);
}

.container-lg {
    max-width: var(--max-width-lg);
}

/* ==================== Header ==================== */
.site-header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) 0;
    gap: var(--space-4);
}

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: var(--color-text);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-xl);
}

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

.logo-icon {
    width: 32px;
    height: 32px;
}

/* ==================== Navigation ==================== */
.primary-nav {
    display: flex;
    gap: var(--space-2);
    list-style: none;
}

.nav-link {
    display: block;
    padding: var(--space-2) var(--space-4);
    text-decoration: none;
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-weight: var(--font-weight-medium);
}

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

.nav-link.active {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

/* ==================== Main Content ==================== */
.main-content {
    min-height: calc(100vh - 200px);
    padding: var(--space-8) 0;
}

/* ==================== Footer ==================== */
.site-footer {
    background: linear-gradient(180deg, var(--color-surface) 0%, #f8f9fa 100%);
    border-top: 2px solid var(--color-border);
    margin-top: auto;
    padding: var(--space-10) 0 var(--space-6) 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-10);
    padding-bottom: var(--space-8);
    border-bottom: 1px solid var(--color-border);
}

/* Footer Info */
.footer-info {
    max-width: 400px;
}

.footer-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
}

.footer-brand svg {
    color: var(--color-primary);
}

.footer-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-6);
}

/* Language Switcher */
.footer-lang-switcher {
    display: flex;
    gap: var(--space-2);
    margin-top: var(--space-4);
}

.lang-btn {
    padding: var(--space-2) var(--space-4);
    border: 2px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-bg);
}

.lang-btn.active {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: white;
}

/* Footer Links Grid */
.footer-links-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.footer-links-title {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-4);
}

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

.footer-links-list li {
    margin-bottom: var(--space-3);
}

.footer-links-list a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: all 0.2s ease;
    display: inline-block;
}

.footer-links-list a:hover {
    color: var(--color-primary);
    transform: translateX(4px);
}

/* Footer Bottom */
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-6);
    flex-wrap: wrap;
    gap: var(--space-4);
}

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

.footer-bottom-left p:first-child {
    margin-bottom: var(--space-1);
    color: var(--color-text);
}

.footer-subtitle {
    font-size: 0.75rem !important;
    color: var(--color-text-muted) !important;
}

.footer-bottom-right {
    display: flex;
    gap: var(--space-4);
    align-items: center;
}

.footer-badge-item {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    background: var(--color-gray-100);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.footer-badge-item svg {
    color: var(--color-primary);
}

/* Responsive Footer */
@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

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

@media (max-width: 640px) {
    .footer-links-grid {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .footer-bottom-right {
        flex-direction: column;
    }

    .footer-lang-switcher {
        justify-content: center;
    }
}

/* ==================== Grid System ==================== */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ==================== Flex Utilities ==================== */
.flex {
    display: flex;
}

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

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

.items-center {
    align-items: center;
}

.items-start {
    align-items: flex-start;
}

.items-end {
    align-items: flex-end;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-end {
    justify-content: flex-end;
}

.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ==================== Hero Section ==================== */
.hero {
    text-align: center;
    padding: var(--space-16) 0;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-surface) 100%);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-8);
}

.hero-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-4);
    color: var(--color-text);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ==================== Section ==================== */
.section {
    margin-bottom: var(--space-12);
}

.section-header {
    margin-bottom: var(--space-6);
}

.section-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-2);
}

.section-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

/* ==================== Card Layout ==================== */
.card-grid {
    display: grid;
    gap: var(--space-6);
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

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

/* Mobile (360px+) - Base styles above */

/* Tablet (768px+) */
@media (min-width: 768px) {
    .container {
        padding-left: var(--space-6);
        padding-right: var(--space-6);
    }

    .header-content {
        padding: var(--space-5) 0;
    }

    .primary-nav {
        gap: var(--space-1);
    }

    .hero {
        padding: var(--space-16) var(--space-8);
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

    /* Responsive Grid */
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

    /* Mobile Nav Toggle Hidden */
    .mobile-nav-toggle {
        display: none;
    }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
    .main-content {
        padding: var(--space-12) 0;
    }

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

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

    /* Responsive Grid */
    .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* Large Desktop (1280px+) */
@media (min-width: 1280px) {
    .container {
        padding-left: var(--space-8);
        padding-right: var(--space-8);
    }

    /* Responsive Grid */
    .xl\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .xl\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ==================== Mobile Navigation ==================== */
.mobile-nav-toggle {
    display: block;
    background: none;
    border: none;
    padding: var(--space-2);
    cursor: pointer;
    color: var(--color-text);
}

.primary-nav {
    display: none;
}

.primary-nav.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    box-shadow: var(--shadow-lg);
}

@media (min-width: 768px) {
    .primary-nav {
        display: flex;
        flex-direction: row;
    }

    .primary-nav.is-open {
        position: static;
        box-shadow: none;
        border-bottom: none;
        padding: 0;
    }
}

/* ==================== Spacing Utilities ==================== */
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

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