/**
 * Advanced Scroll Navigation Module - CSS
 * A comprehensive responsive navigation and scroll progress system
 * 
 * Features:
 * - Floating desktop navigation with glassmorphism design
 * - Mobile dropdown navigation
 * - Animated scroll progress indicator
 * - Customizable via CSS variables
 * - Responsive design with smooth animations
 */

/* ============================================
   CSS VARIABLES FOR EASY CUSTOMIZATION
   ============================================ */
:root {
    /* Brand Colors - Override these to match your brand */
    --snm-primary-color: #21450a;
    --snm-secondary-color: #489255;
    --snm-text-color: #333;
    --snm-text-light: #6c757d;
    --snm-bg-color: rgba(255, 255, 255, 0.95);
    --snm-bg-hover: rgba(177, 28, 46, 0.1);
    
    /* Layout & Spacing */
    --snm-border-radius: 12px;
    --snm-border-radius-sm: 8px;
    --snm-border-radius-circle: 50%;
    --snm-spacing-sm: 0.75rem;
    --snm-spacing-md: 1rem;
    --snm-spacing-lg: 1.5rem;
    
    /* Shadows & Effects */
    --snm-shadow-light: 0 4px 12px rgba(0, 0, 0, 0.1);
    --snm-shadow-medium: 0 8px 32px rgba(0, 0, 0, 0.1);
    --snm-shadow-heavy: 0 20px 40px rgba(0, 0, 0, 0.15);
    --snm-backdrop-blur: blur(10px);
    
    /* Transitions */
    --snm-transition-fast: 0.2s ease;
    --snm-transition-medium: 0.3s ease;
    --snm-transition-slow: 0.5s ease;
    
    /* Z-index layers */
    --snm-z-progress: 1001;
    --snm-z-mobile-nav: 999;
    --snm-z-floating-nav: 1000;
    --snm-z-toggle: 1010;
    
    /* Typography */
    --snm-font-size-sm: 0.9rem;
    --snm-font-size-base: 1rem;
    --snm-font-weight-normal: 500;
    --snm-font-weight-bold: 700;
}

/* ============================================
   SCROLL PROGRESS BAR
   ============================================ */
.scroll-progress-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: linear-gradient(90deg, var(--snm-primary-color), var(--snm-secondary-color));
    z-index: var(--snm-z-progress);
    transition: width 0.1s ease;
    border-radius: 0 2px 0 0;
}

/* Alternative top progress bar */
.scroll-progress-bar.top {
    top: 0;
    bottom: unset;
    border-radius: 0 0 2px 0;
}

/* ============================================
   FLOATING DESKTOP NAVIGATION
   ============================================ */
.floating-section-nav {
    position: fixed;
    top: 50%;
    right: 2rem;
    transform: translateY(-50%);
    z-index: var(--snm-z-floating-nav);
    background: var(--snm-bg-color);
    backdrop-filter: var(--snm-backdrop-blur);
    -webkit-backdrop-filter: var(--snm-backdrop-blur);
    border-radius: var(--snm-border-radius);
    padding: var(--snm-spacing-md) 0;
    box-shadow: var(--snm-shadow-medium);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--snm-transition-medium);
    opacity: 0.6;
    pointer-events: none;
}

/* Show navigation when scrolled */
.floating-section-nav.visible {
    opacity: 1;
    pointer-events: all;
}

/* Collapsed state */
.floating-section-nav.collapsed {
    transform: translateY(-50%) translateX(calc(100% - 60px));
}

/* Auto-collapse on mobile screens */
@media (max-width: 992px) {
    .floating-section-nav {
        transform: translateY(-50%) translateX(calc(100% - 30px));
    }
    
    .floating-section-nav.expanded {
        transform: translateY(-50%) translateX(0);
    }
}

/* Navigation toggle button */
.nav-toggle-btn {
    position: absolute;
    left: -20px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--snm-primary-color);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: var(--snm-border-radius-circle);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--snm-shadow-light);
    transition: var(--snm-transition-medium);
    z-index: var(--snm-z-toggle);
    cursor: pointer;
}

.nav-toggle-btn:hover {
    background: var(--snm-secondary-color);
    transform: translateY(-50%) scale(1.1);
    box-shadow: var(--snm-shadow-heavy);
}

.nav-toggle-btn:focus {
    outline: 2px solid var(--snm-primary-color);
    outline-offset: 2px;
}

/* Navigation list */
.nav-section-list {
    list-style: none;
    padding: 0;
    margin: 0;
    min-width: 200px;
}

.nav-section-list li {
    margin: 0;
}

/* Navigation links container (if using div instead of ul) */
.nav-links-container {
    padding: 0;
    margin: 0;
    min-width: 200px;
}

/* Navigation links */
.nav-section-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: var(--snm-spacing-sm) var(--snm-spacing-lg);
    color: var(--snm-text-color);
    text-decoration: none;
    font-weight: var(--snm-font-weight-normal);
    font-size: var(--snm-font-size-sm);
    border-left: 3px solid transparent;
    transition: var(--snm-transition-medium);
    position: relative;
}

.nav-section-link i {
    font-size: 1.1rem;
    min-width: 1.1rem;
}

.nav-section-link span {
    flex: 1;
}

.nav-section-link:hover,
.nav-section-link.active {
    background: var(--snm-bg-hover);
    border-left-color: var(--snm-primary-color);
    color: var(--snm-primary-color);
    transform: translateX(5px);
    text-decoration: none;
}

/* Active link indicator */
.nav-section-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--snm-primary-color);
    transform: scaleY(0);
    transition: transform var(--snm-transition-medium);
}

.nav-section-link.active::before {
    transform: scaleY(1);
}

/* ============================================
   MOBILE NAVIGATION
   ============================================ */
.mobile-section-nav {
    display: none;
    position: sticky;
    top: 76px; /* Adjust based on your header height */
    background: var(--snm-bg-color);
    backdrop-filter: var(--snm-backdrop-blur);
    -webkit-backdrop-filter: var(--snm-backdrop-blur);
    z-index: var(--snm-z-mobile-nav);
    border-bottom: 1px solid #e9ecef;
    padding: var(--snm-spacing-md) 0;
}

.mobile-section-select {
    width: 100%;
    border: 2px solid var(--snm-primary-color);
    border-radius: var(--snm-border-radius-sm);
    padding: var(--snm-spacing-sm);
    font-weight: var(--snm-font-weight-normal);
    background: white;
    color: var(--snm-text-color);
    font-size: var(--snm-font-size-base);
    transition: var(--snm-transition-fast);
}

.mobile-section-select:focus {
    box-shadow: 0 0 0 0.2rem rgba(177, 28, 46, 0.25);
    border-color: var(--snm-primary-color);
    outline: none;
}

/* ============================================
   RESPONSIVE BEHAVIOR
   ============================================ */
@media (max-width: 1200px) {
    .floating-section-nav {
        right: 1rem;
    }
}

@media (max-width: 992px) {
    /* Keep floating nav visible on mobile but make it more compact */
    .floating-section-nav {
        right: 0.5rem;
        min-width: 200px;
    }
    
    /* Hide mobile select nav since we're using floating nav */
    .mobile-section-nav {
        display: none;
    }
    
    /* Make nav links more compact on mobile */
    .nav-section-link {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }
    
    /* Adjust collapsed state for mobile - slide further out */
    .floating-section-nav.collapsed {
        transform: translateY(-50%) translateX(calc(100% - 30px));
    }
    
    /* Make toggle button slightly smaller on mobile */
    .nav-toggle-btn {
        width: 35px;
        height: 35px;
        left: -17px;
    }
}

@media (max-width: 768px) {
    .floating-section-nav {
        right: 0.25rem;
        min-width: 180px;
    }
    
    .nav-section-list {
        min-width: 160px;
    }
    
    /* Even more compact on smaller screens */
    .nav-section-link {
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
    }
    
    /* Slide out even further on small screens */
    .floating-section-nav.collapsed {
        transform: translateY(-50%) translateX(calc(100% - 30px));
    }
    
    /* Smaller toggle button on very small screens */
    .nav-toggle-btn {
        width: 32px;
        height: 32px;
        left: -16px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    /* Ultra compact for very small screens */
    .floating-section-nav {
        right: 0.1rem;
        min-width: 160px;
    }
    
    .nav-section-link {
        padding: 0.4rem 0.6rem;
        font-size: 0.75rem;
        display: flex;
        align-items: center;
        gap: 0.3rem;
    }
    
    /* Keep both icons and text, but make them smaller */
    .nav-section-link i {
        font-size: 1rem;
        min-width: 1rem;
    }
    
    .nav-section-link span {
        font-size: 0.7rem;
    }
    
    /* Adjust width for compact view */
    .floating-section-nav {
        min-width: 140px;
    }
    
    .nav-links-container {
        min-width: 140px;
    }
    
    .floating-section-nav.collapsed {
        transform: translateY(-50%) translateX(calc(100% - 22px));
    }
    
    .nav-toggle-btn {
        width: 30px;
        height: 30px;
        left: -15px;
        font-size: 0.8rem;
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Content sections - add this class to your sections */
.content-section {
    scroll-margin-top: 80px; /* Adjust based on your header height */
    min-height: 50vh; /* Ensure sections are tall enough for proper detection */
}

/* Hide navigation initially */
.floating-section-nav.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(-50%) translateX(100%);
}

/* Loading state */
.floating-section-nav.loading {
    opacity: 0.3;
    pointer-events: none;
}

/* ============================================
   ANIMATION KEYFRAMES
   ============================================ */
@keyframes slideInRight {
    from {
        transform: translateY(-50%) translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateY(-50%) translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateY(-50%) translateX(0);
        opacity: 1;
    }
    to {
        transform: translateY(-50%) translateX(100%);
        opacity: 0;
    }
}

/* Apply animations */
.floating-section-nav.entering {
    animation: slideInRight var(--snm-transition-medium) ease-out;
}

.floating-section-nav.exiting {
    animation: slideOutRight var(--snm-transition-medium) ease-in;
}

/* ============================================
   ACCESSIBILITY IMPROVEMENTS
   ============================================ */

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    .floating-section-nav,
    .nav-section-link,
    .nav-toggle-btn,
    .scroll-progress-bar {
        transition: none;
        animation: none;
    }
    
    .nav-section-link:hover,
    .nav-section-link.active {
        transform: none;
    }
    
    .nav-toggle-btn:hover {
        transform: translateY(-50%);
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .floating-section-nav {
        border: 2px solid var(--snm-text-color);
        background: white;
    }
    
    .nav-toggle-btn {
        border: 2px solid white;
    }
    
    .scroll-progress-bar {
        background: var(--snm-text-color);
    }
}

/* Focus styles for keyboard navigation */
.nav-section-link:focus-visible {
    outline: 2px solid var(--snm-primary-color);
    outline-offset: 2px;
    background: var(--snm-bg-hover);
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .floating-section-nav,
    .mobile-section-nav,
    .scroll-progress-bar {
        display: none !important;
    }
}