/* ========================================
   CSS VARIABLES - CONFIGURATION SETTINGS
   ======================================== */
:root {
    /* Arrow Colors */
    --arrow-initial-color: #cccccc;
    --arrow-hover-color: #E4612F;
    
    /* Arrow Sizes */
    --arrow-initial-size: 32px;
    --arrow-enlarged-size: 64px;
    --arrow-enlarge-scale: 2.0;
    
    /* Arrow Stroke Widths */
    --arrow-initial-stroke: 2px;
    --arrow-enlarged-stroke: 3px;
    
    /* Animation */
    --transition-duration: 800ms;
    --arrow-hover-duration: 300ms;
    
    /* Layout */
    --nav-panel-width: 260px;
    --arrow-container-height: 60px;
    
    /* Colors - wdevs.com theme (brighter, cleaner orange) */
    --primary-orange: #E4612F;
    --primary-orange-light: rgba(228, 97, 47, 0.08);
    --primary-orange-glow: rgba(228, 97, 47, 0.15);
    --nav-active-bg: transparent;
    --nav-hover-bg: transparent;
    --content-bg: #ffffff;
    --border-color: #e0e0e0;
    --text-dark: #2d2d2d;
    --text-medium: #555555;
    --text-light: #777777;
}

/* ========================================
   GLOBAL RESET & BASE STYLES
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow: hidden;
}

/* ========================================
   MAIN CONTAINER LAYOUT
   ======================================== */
.container {
    display: flex;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

/* ========================================
   NAVIGATION PANEL
   ======================================== */
.navigation-panel {
    width: var(--nav-panel-width);
    background-color: transparent;
    border-left: 3px solid #f5f5f5;
    padding: 35px 0 35px 25px;
    overflow-y: auto;
    flex-shrink: 0;
}

.nav-item {
    padding: 14px 22px;
    margin: 3px 0;
    cursor: pointer;
    transition: color 0.25s ease, transform 0.2s ease;
    user-select: none;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-light);
    line-height: 1.5;
    position: relative;
}

/* Main navigation items (bold, larger) */
.nav-item.nav-main {
    font-weight: 600;
    font-size: 1.1rem;
    padding-top: 20px;
    padding-bottom: 14px;
    color: var(--text-medium);
    letter-spacing: 0.4px;
    margin-top: 8px;
}

/* Sub navigation items (indented, lighter) */
.nav-item.nav-sub {
    padding-left: 38px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-light);
}

.nav-item:hover {
    color: var(--primary-orange);
    transform: translateX(2px);
}

/* Brush stroke background effect for active items */
.nav-item.active {
    color: var(--primary-orange);
    font-weight: 500;
}

.nav-item.nav-main.active {
    font-weight: 600;
    font-size: 1.1rem;
}

.nav-item.nav-sub.active {
    font-weight: 500;
}

/* Keep styling during deactivation */
.nav-item.deactivating {
    color: var(--primary-orange);
    font-weight: 500;
}

.nav-item.nav-main.deactivating {
    font-weight: 600;
    font-size: 1.1rem;
}

.nav-item.nav-sub.deactivating {
    font-weight: 500;
}

/* Deep sub navigation items (third level, indented further) */
.nav-item.nav-sub-item {
    padding-left: 54px;
    padding-top: 8px;
    padding-bottom: 8px;
    margin: 0;
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--text-light);
}

.nav-item.nav-sub-item:hover {
    color: var(--primary-orange);
}

/* Nav group labels — section divider style */
.nav-item.nav-group {
    position: relative;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: #aaaaaa;
    padding-top: 18px;
    padding-bottom: 6px;
    padding-left: 30px;
    cursor: pointer;
}

.nav-item.nav-group:hover {
    color: var(--text-medium);
    transform: none;
}

/* Group active state — subtle, no brush stroke */
.nav-item.nav-group.active {
    color: var(--text-medium);
    font-weight: 600;
}

.nav-item.nav-group.active::before {
    display: none;
}

.nav-item.nav-group.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 23px;
    width: 80px;
    height: 1px;
    background: linear-gradient(to right, #e0e0e0, transparent);
    top: auto;
    border-radius: 0;
    transform: none;
    box-shadow: none;
    animation: none;
}

.nav-item.nav-group.deactivating {
    color: #aaaaaa;
    font-weight: 600;
}

.nav-item.nav-group.deactivating::before {
    display: none;
}

.nav-item.nav-group.deactivating::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 23px;
    width: 80px;
    height: 1px;
    background: linear-gradient(to right, #e0e0e0, transparent);
    top: auto;
    border-radius: 0;
    transform: none;
    box-shadow: none;
    animation: none;
    opacity: 0;
    transition: opacity 0.4s ease-in;
}

/* Sub-item active — keep light weight, orange color comes from base .active rule */
.nav-item.nav-sub-item.active {
    font-weight: 400;
}

.nav-item.nav-sub-item.deactivating {
    font-weight: 400;
}

.nav-group-wrapper {
    position: relative;
}

.nav-group-wrapper .nav-group-line {
    position: absolute;
    left: 31px;
    width: 1px;
    background: #e0e0e0;
    pointer-events: none;
    z-index: 0;
    top: 35px;
    bottom: 8px;
}


/* Sub-item active — brush stroke starts from vertical line */
.nav-item.nav-sub-item.active::before {
    left: 34px;
}

.nav-item.nav-sub-item.deactivating::before {
    left: 34px;
}

/* Sub-item active — orange bar aligns with vertical line */
.nav-item.nav-sub-item.active::after {
    left: 34px;
    top: 4px;
    bottom: 4px;
    width: 3px;
    background: linear-gradient(
        to bottom,
        transparent,
        var(--primary-orange) 20%,
        var(--primary-orange) 80%,
        transparent
    );
    border-radius: 2px;
}

.nav-item.nav-sub-item.deactivating::after {
    left: 34px;
    top: 4px;
    bottom: 4px;
    width: 3px;
    background: linear-gradient(
        to bottom,
        transparent,
        var(--primary-orange) 20%,
        var(--primary-orange) 80%,
        transparent
    );
    border-radius: 2px;
}

.nav-item.active::before,
.nav-item.deactivating::before {
    content: '';
    position: absolute;
    left: -25px;
    right: -5px;
    top: 2px;
    bottom: 2px;
    background: linear-gradient(
        to right,
        var(--primary-orange-glow) 0%,
        var(--primary-orange-light) 30%,
        rgba(228, 97, 47, 0.04) 70%,
        transparent 100%
    );
    border-radius: 8px 12px 10px 8px;
    transform: rotate(-0.5deg);
    transform-origin: left center;
    z-index: -1;
    box-shadow: 
        0 1px 3px rgba(228, 97, 47, 0.1),
        inset 1px 1px 2px rgba(255, 255, 255, 0.8);
}

.nav-item.active::before {
    animation: brushGrowHorizontal 0.5s ease-out forwards;
}

/* Deactivating animation - reverse effect */
.nav-item.deactivating::before {
    animation: brushShrinkHorizontal 0.4s ease-in forwards;
}

.nav-item.active::after,
.nav-item.deactivating::after {
    content: '';
    position: absolute;
    left: -25px;
    top: 4px;
    bottom: 4px;
    width: 3px;
    background: linear-gradient(
        to bottom,
        transparent,
        var(--primary-orange) 20%,
        var(--primary-orange) 80%,
        transparent
    );
    border-radius: 2px;
}

.nav-item.active::after {
    animation: barFadeIn 0.3s ease-out forwards;
}

.nav-item.deactivating::after {
    animation: barFadeOut 0.3s ease-in forwards;
}

@keyframes brushGrowHorizontal {
    0% {
        clip-path: inset(0 100% 0 0);
        opacity: 0;
    }
    100% {
        clip-path: inset(0 0 0 0);
        opacity: 1;
    }
}

@keyframes brushShrinkHorizontal {
    0% {
        clip-path: inset(0 0 0 0);
        opacity: 1;
    }
    100% {
        clip-path: inset(0 100% 0 0);
        opacity: 0;
    }
}

@keyframes barFadeIn {
    from {
        opacity: 0;
        transform: scaleY(0.5);
    }
    to {
        opacity: 1;
        transform: scaleY(1);
    }
}

@keyframes barFadeOut {
    from {
        opacity: 1;
        transform: scaleY(1);
    }
    to {
        opacity: 0;
        transform: scaleY(0.5);
    }
}

/* ========================================
   MAIN CONTENT AREA
   ======================================== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

/* ========================================
   ARROW CONTAINERS
   ======================================== */
.arrow-container {
    width: 100%;
    height: var(--arrow-container-height);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--content-bg);
    flex-shrink: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.arrow-container.visible {
    opacity: 1;
    visibility: visible;
}

/* ========================================
   SVG ARROW STYLING
   ======================================== */
.arrow-svg {
    width: var(--arrow-initial-size);
    height: var(--arrow-initial-size);
    cursor: pointer;
    color: var(--arrow-initial-color);
    transition: transform var(--arrow-hover-duration) ease,
                color var(--arrow-hover-duration) ease;
    transform-origin: center center;
}

/* Hover effect - only applies when not being controlled by scroll trigger */
.arrow-svg:hover {
    transform: scale(var(--arrow-enlarge-scale));
    color: var(--arrow-hover-color);
}

/* Disable hover when scroll-triggering is active */
.arrow-svg.scroll-triggering {
    pointer-events: auto;
}

.arrow-svg.scroll-triggering:hover {
    transform: none;
    color: inherit;
}

/* ========================================
   CONTENT WRAPPER & AREAS
   ======================================== */
.content-wrapper {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--content-bg);
}

.content-area {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    opacity: 0;
    visibility: hidden;
}

.content-area.active-content {
    opacity: 1;
    visibility: visible;
    z-index: 2;
}

.content-area.next-content {
    z-index: 3;
}

/* ========================================
   ANIMATION CLASSES
   ======================================== */
.slide-down-enter {
    animation: slideDownEnter var(--transition-duration) ease-out forwards;
}

.slide-down-exit {
    animation: slideDownExit var(--transition-duration) ease-out forwards;
}

.slide-up-enter {
    animation: slideUpEnter var(--transition-duration) ease-out forwards;
}

.slide-up-exit {
    animation: slideUpExit var(--transition-duration) ease-out forwards;
}

@keyframes slideDownEnter {
    0% {
        transform: translateY(-100%) scaleY(1);
        opacity: 0;
        visibility: visible;
    }
    60% {
        transform: translateY(0%) scaleY(1);
        opacity: 1;
    }
    75% {
        transform: translateY(5%) scaleY(0.95);
        opacity: 1;
    }
    90% {
        transform: translateY(-2%) scaleY(1.02);
        opacity: 1;
    }
    100% {
        transform: translateY(0%) scaleY(1);
        opacity: 1;
        visibility: visible;
    }
}

@keyframes slideDownExit {
    0% {
        transform: translateY(0);
        opacity: 1;
    }
    50% {
        transform: translateY(50%);
        opacity: 0.3;
    }
    75% {
        transform: translateY(75%);
        opacity: 0;
    }
    100% {
        transform: translateY(100%);
        opacity: 0;
        visibility: hidden;
    }
}

@keyframes slideUpEnter {
    0% {
        transform: translateY(100%) scaleY(1);
        opacity: 0;
        visibility: visible;
    }
    60% {
        transform: translateY(0%) scaleY(1);
        opacity: 1;
    }
    75% {
        transform: translateY(-5%) scaleY(0.95);
        opacity: 1;
    }
    90% {
        transform: translateY(2%) scaleY(1.02);
        opacity: 1;
    }
    100% {
        transform: translateY(0%) scaleY(1);
        opacity: 1;
        visibility: visible;
    }
}

@keyframes slideUpExit {
    0% {
        transform: translateY(0);
        opacity: 1;
    }
    50% {
        transform: translateY(-50%);
        opacity: 0.3;
    }
    75% {
        transform: translateY(-75%);
        opacity: 0;
    }
    100% {
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
    }
}

/* ========================================
   SCROLLBAR STYLING
   ======================================== */
.content-area::-webkit-scrollbar {
    width: 10px;
}

.content-area::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 5px;
}

.content-area::-webkit-scrollbar-thumb {
    background: #c0c0c0;
    border-radius: 5px;
}

.content-area::-webkit-scrollbar-thumb:hover {
    background: #a0a0a0;
}

/* ========================================
   RESPONSIVE DESIGN - MOBILE
   ======================================== */
@media screen and (max-width: 768px) {
    :root {
        --nav-panel-width: 190px;
        --arrow-container-height: 50px;
    }
    
    .navigation-panel {
        padding: 25px 0 25px 18px;
    }
    
    .nav-item {
        font-size: 0.9rem;
        font-weight: 500;
        padding: 12px 18px;
    }
    
    .nav-item.nav-main {
        font-size: 0.95rem;
        font-weight: 600;
        padding-top: 16px;
    }
    
    .nav-item.nav-sub {
        padding-left: 30px;
        font-size: 0.85rem;
        font-weight: 500;
    }
}

@media screen and (max-width: 480px) {
    :root {
        --nav-panel-width: 150px;
        --arrow-initial-size: 28px;
        --arrow-enlarged-size: 56px;
    }
    
    .navigation-panel {
        padding: 20px 0 20px 12px;
    }
    
    .nav-item {
        font-size: 0.8rem;
        font-weight: 500;
        padding: 10px 12px;
    }
    
    .nav-item.nav-main {
        font-size: 0.85rem;
        font-weight: 600;
        padding-top: 14px;
    }
    
    .nav-item.nav-sub {
        padding-left: 24px;
        font-size: 0.75rem;
        font-weight: 500;
    }
}