/**
 * Nature Index - Layout Styles
 * Header, Footer, Navigation, Page structure
 * ==========================================
 */

/* ========================================
   Body Wrapper
   ======================================== */

.ni-body-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.ni-main-content {
    flex: 1;
}

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

.ni-header {
    position: relative;
    z-index: var(--ni-z-sticky);
    background-color: var(--ni-bg-surface);
    box-shadow: var(--ni-shadow-sm);
}

.ni-header.ni-header-sticky {
    position: sticky;
    top: 0;
}

.ni-header.ni-header-transparent {
    position: absolute;
    left: 0;
    right: 0;
    background-color: transparent;
    box-shadow: none;
}

.ni-header.ni-header-transparent .ni-header-main {
    background-color: transparent;
}

/* Top Bar */
.ni-header-topbar {
    background-color: var(--ni-primary-dark);
    color: var(--ni-text-inverse);
    font-size: var(--ni-text-sm);
    padding: var(--ni-space-2) 0;
}

.ni-header-topbar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ni-topbar-left {
    display: flex;
    align-items: center;
    gap: var(--ni-space-4);
}

.ni-topbar-contact {
    display: flex;
    align-items: center;
    gap: var(--ni-space-2);
}

.ni-topbar-contact i {
    opacity: 0.7;
}

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

.ni-topbar-social {
    display: flex;
    gap: var(--ni-space-2);
}

.ni-topbar-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    color: var(--ni-text-inverse);
    opacity: 0.7;
    transition: var(--ni-transition-fast);
}

.ni-topbar-social a:hover {
    opacity: 1;
    text-decoration: none;
}

/* Main Header */
.ni-header-main {
    background-color: var(--ni-bg-surface);
    padding: var(--ni-space-4) 0;
}

.ni-header-main-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo */
.ni-logo {
    display: flex;
    align-items: center;
}

.ni-logo a {
    display: flex;
    align-items: center;
    gap: var(--ni-space-3);
    text-decoration: none;
}

.ni-logo img {
    height: 50px;
    width: auto;
}

.ni-logo-icon {
    height: 36px;
    width: auto;
    border-radius: 4px;
}

.ni-logo-text {
    font-family: var(--ni-font-primary);
    font-size: var(--ni-text-xl);
    font-weight: var(--ni-font-bold);
    color: var(--ni-primary-dark);
}

.ni-logo-tagline {
    font-size: var(--ni-text-xs);
    color: var(--ni-text-muted);
    letter-spacing: var(--ni-tracking-wide);
}

/* ========================================
   Navigation
   ======================================== */

.ni-nav {
    display: flex;
    align-items: center;
}

.ni-nav-menu {
    display: flex;
    align-items: center;
    gap: var(--ni-space-1);
    list-style: none;
    margin: 0;
    padding: 0;
}

.ni-nav-item {
    position: relative;
}

.ni-nav-link {
    display: flex;
    align-items: center;
    gap: var(--ni-space-2);
    padding: var(--ni-space-2) var(--ni-space-4);
    color: var(--ni-text-primary);
    font-weight: var(--ni-font-medium);
    text-decoration: none;
    border-radius: var(--ni-radius-md);
    transition: var(--ni-transition-colors);
}

.ni-nav-link:hover {
    color: var(--ni-primary);
    background-color: var(--ni-gray-100);
    text-decoration: none;
}

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

.ni-nav-link i {
    font-size: var(--ni-text-lg);
}

/* Dropdown */
.ni-nav-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background-color: var(--ni-bg-surface);
    border-radius: var(--ni-radius-lg);
    box-shadow: var(--ni-shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--ni-transition-normal);
    z-index: var(--ni-z-dropdown);
    padding: var(--ni-space-2);
    list-style: none;
    margin: 0;
}

.ni-nav-item:hover > .ni-nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.ni-nav-dropdown .ni-nav-link {
    padding: var(--ni-space-2) var(--ni-space-3);
    border-radius: var(--ni-radius-md);
}

/* Sub-dropdown (nested) */
.ni-nav-dropdown .ni-nav-dropdown {
    top: 0;
    left: 100%;
}

/* Dropdown indicator */
.ni-nav-item.has-dropdown > .ni-nav-link::after {
    content: '\f107';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: var(--ni-text-xs);
    margin-left: var(--ni-space-1);
}

/* Mobile menu toggle */
.ni-nav-toggle {
    display: none;
    padding: var(--ni-space-2);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--ni-text-primary);
}

.ni-nav-toggle-icon {
    display: block;
    width: 24px;
    height: 2px;
    background-color: currentColor;
    position: relative;
    transition: var(--ni-transition-fast);
}

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

.ni-nav-toggle-icon::before { top: -7px; }
.ni-nav-toggle-icon::after { bottom: -7px; }

/* Header Actions */
.ni-header-actions {
    display: flex;
    align-items: center;
    gap: var(--ni-space-3);
}

/* ========================================
   Footer
   ======================================== */

.ni-footer {
    background-color: var(--ni-primary-dark);
    color: var(--ni-text-inverse);
}

.ni-footer-main {
    padding: var(--ni-space-16) 0;
}

.ni-footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--ni-space-8);
}

.ni-footer-brand {
    grid-column: span 1;
}

.ni-footer-brand .ni-logo-text {
    color: var(--ni-white);
    margin-bottom: var(--ni-space-4);
}

.ni-footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--ni-space-6);
}

.ni-footer-section h4 {
    color: var(--ni-white);
    font-size: var(--ni-text-lg);
    margin-bottom: var(--ni-space-6);
    position: relative;
    padding-bottom: var(--ni-space-3);
}

.ni-footer-section h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--ni-accent);
}

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

.ni-footer-links li {
    margin-bottom: var(--ni-space-2);
}

.ni-footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--ni-transition-colors);
}

.ni-footer-links a:hover {
    color: var(--ni-white);
    text-decoration: none;
}

.ni-footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--ni-space-3);
    margin-bottom: var(--ni-space-4);
    color: rgba(255, 255, 255, 0.7);
}

.ni-footer-contact-item i {
    color: var(--ni-accent);
    margin-top: 3px;
}

/* Footer Bottom */
.ni-footer-bottom {
    padding: var(--ni-space-6) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.ni-footer-bottom-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ni-footer-copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--ni-text-sm);
}

.ni-footer-social {
    display: flex;
    gap: var(--ni-space-3);
}

.ni-footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--ni-white);
    border-radius: var(--ni-radius-full);
    transition: var(--ni-transition-colors);
}

.ni-footer-social a:hover {
    background-color: var(--ni-accent);
    text-decoration: none;
}

/* ========================================
   Page Header / Hero
   ======================================== */

.ni-page-header {
    position: relative;
    background-color: var(--ni-primary-dark);
    background-size: cover;
    background-position: center;
    padding: var(--ni-space-16) 0;
    overflow: hidden;
}

.ni-page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(26, 60, 52, 0.95) 0%, rgba(45, 90, 74, 0.85) 100%);
}

.ni-page-header-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--ni-white);
}

.ni-page-title {
    font-size: var(--ni-text-3xl);
    font-weight: var(--ni-font-bold);
    margin-bottom: var(--ni-space-3);
    color: var(--ni-white);
}

.ni-page-subtitle {
    font-size: var(--ni-text-lg);
    opacity: 0.8;
    max-width: 600px;
    margin: 0 auto;
    color: var(--ni-white);
}

/* Breadcrumb */
.ni-breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--ni-space-2);
    margin-top: var(--ni-space-4);
    font-size: var(--ni-text-sm);
}

.ni-breadcrumb a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
}

.ni-breadcrumb a:hover {
    color: var(--ni-white);
    text-decoration: none;
}

.ni-breadcrumb-separator {
    color: rgba(255, 255, 255, 0.4);
}

.ni-breadcrumb-current {
    color: var(--ni-accent);
}

/* ========================================
   Sidebar Layout
   ======================================== */

.ni-layout-sidebar {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: calc(100vh - var(--ni-header-total-height));
}

.ni-sidebar {
    background-color: var(--ni-bg-surface);
    border-right: 1px solid var(--ni-border-color);
    padding: var(--ni-space-6);
}

.ni-sidebar-nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ni-sidebar-nav-item {
    margin-bottom: var(--ni-space-1);
}

.ni-sidebar-nav-link {
    display: flex;
    align-items: center;
    gap: var(--ni-space-3);
    padding: var(--ni-space-3) var(--ni-space-4);
    color: var(--ni-text-secondary);
    text-decoration: none;
    border-radius: var(--ni-radius-md);
    transition: var(--ni-transition-colors);
}

.ni-sidebar-nav-link:hover {
    color: var(--ni-primary);
    background-color: var(--ni-gray-100);
    text-decoration: none;
}

.ni-sidebar-nav-link.active {
    color: var(--ni-primary);
    background-color: var(--ni-primary-lightest);
    font-weight: var(--ni-font-medium);
}

.ni-sidebar-nav-link i {
    width: 20px;
    text-align: center;
}

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

.ni-sidebar-section-title {
    font-size: var(--ni-text-xs);
    font-weight: var(--ni-font-semibold);
    text-transform: uppercase;
    letter-spacing: var(--ni-tracking-wider);
    color: var(--ni-text-muted);
    padding: var(--ni-space-2) var(--ni-space-4);
    margin-bottom: var(--ni-space-2);
}

/* ========================================
   Content Area
   ======================================== */

.ni-content {
    padding: var(--ni-space-8);
    background-color: var(--ni-bg-body);
}

.ni-content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--ni-space-6);
}

.ni-content-title {
    font-size: var(--ni-text-2xl);
    font-weight: var(--ni-font-bold);
    margin: 0;
}

.ni-content-actions {
    display: flex;
    gap: var(--ni-space-3);
}

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

@media (max-width: 991px) {
    .ni-header-topbar {
        display: none;
    }
    
    .ni-nav {
        position: fixed;
        top: 0;
        left: -280px;
        width: 280px;
        height: 100vh;
        background-color: var(--ni-bg-surface);
        flex-direction: column;
        align-items: stretch;
        padding: var(--ni-space-6);
        overflow-y: auto;
        transition: var(--ni-transition-normal);
        z-index: var(--ni-z-fixed);
        box-shadow: var(--ni-shadow-xl);
    }
    
    .ni-nav.is-open {
        left: 0;
    }
    
    .ni-nav-menu {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }
    
    .ni-nav-dropdown {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        padding-left: var(--ni-space-4);
        display: none;
    }
    
    .ni-nav-item.is-open > .ni-nav-dropdown {
        display: block;
    }
    
    .ni-nav-toggle {
        display: block;
    }
    
    .ni-nav-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
        opacity: 0;
        visibility: hidden;
        transition: var(--ni-transition-normal);
        z-index: calc(var(--ni-z-fixed) - 1);
    }
    
    .ni-nav-overlay.is-visible {
        opacity: 1;
        visibility: visible;
    }
    
    /* Sidebar responsive */
    .ni-layout-sidebar {
        grid-template-columns: 1fr;
    }
    
    .ni-sidebar {
        display: none;
    }
    
    /* Footer responsive */
    .ni-footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 575px) {
    .ni-footer-grid {
        grid-template-columns: 1fr;
    }
    
    .ni-footer-bottom-inner {
        flex-direction: column;
        gap: var(--ni-space-4);
        text-align: center;
    }
    
    .ni-page-title {
        font-size: var(--ni-text-3xl);
    }
}