:root {
    --primary: #0284c7; /* Sky 600 - More vibrant blue */
    --primary-light: #e0f2fe; /* Sky 100 - For light backgrounds */
    --secondary: #0ea5e9; /* Sky 500 - Secondary blue */
    --bg-light: #f8fafc;
    --sidebar-bg: #ffffff;
    --text-main: #0f172a; /* Slate 900 - Darker for better contrast */
    --text-muted: #475569; /* Slate 600 - Better readability */
    --border-color: #cbd5e1; /* Slate 300 - Slightly darker borders */
    --accent: #2563eb; /* Royal Blue for high-contrast accents */
    --nav-width-collapsed: 80px;
    --nav-width-expanded: 260px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-main);
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styling */
.navbar {
    width: var(--nav-width-collapsed);
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 24px 0;
    position: fixed;
    height: 100vh;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
}

.navbar:hover, .navbar.expanded {
    width: var(--nav-width-expanded);
}

.navbar-header {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 0 16px 32px;
    min-height: 60px;
    position: relative;
    overflow: visible; /* Added to keep button visible */
}

.navbar-brand {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-main);
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
    flex-grow: 1;
    overflow: hidden; /* Clip brand name */
}

.navbar:hover .navbar-brand, .navbar.expanded .navbar-brand {
    opacity: 1;
    pointer-events: auto;
}

.navbar:hover .brand-name, .navbar.expanded .brand-name,
.navbar:hover .hub-name, .navbar.expanded .hub-name {
    opacity: 1;
    display: inline;
}

.hub-name {
    display: none;
    opacity: 0;
    transition: opacity 0.2s;
}

.hub-badge {
    transition: all 0.2s;
}

.navbar:not(:hover):not(.expanded) .hub-badge {
    padding: 3px;
    background-color: transparent !important;
}

.toggle-sidebar {
    background: var(--primary); /* Stronger color */
    border: none;
    color: white; /* Contrast */
    width: 28px;
    height: 28px;
    border-radius: 50%; /* Circle */
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: absolute;
    right: -14px; /* On the edge */
    top: 30px;
    z-index: 1001;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    border: 2px solid white;
}

.navbar.expanded .toggle-sidebar ion-icon {
    transform: rotate(180deg);
}

.toggle-sidebar:hover {
    transform: scale(1.1);
    background-color: var(--accent);
}

.navbar:not(.expanded):not(:hover) .toggle-sidebar {
    opacity: 0.8;
}

.navbar:hover .toggle-sidebar {
    opacity: 1;
}

.nav-links {
    list-style: none;
    padding: 0;
    margin: 0;
    flex-grow: 1;
    overflow-x: hidden; /* Prevent text overflow */
}

.nav-links li {
    padding: 4px 12px;
}

.nav-links a {
    display: flex;
    align-items: center;
    padding: 12px;
    text-decoration: none;
    color: var(--text-muted);
    border-radius: 12px;
    transition: all 0.2s;
    font-weight: 500;
    white-space: nowrap;
}

.nav-links a ion-icon {
    font-size: 1.6rem;
    min-width: 32px;
    display: flex;
    justify-content: center;
}

.nav-text {
    margin-left: 12px;
    opacity: 0;
    transition: opacity 0.2s;
}

.navbar:hover .nav-text, .navbar.expanded .nav-text {
    opacity: 1;
}

.nav-links a:hover, .nav-links a.active {
    background-color: var(--primary);
    color: white;
}

.btn-nav-profile {
    margin-top: auto;
    background-color: var(--primary-light) !important;
    color: var(--primary) !important;
}

/* Main Content Area */
.main-content-wrapper {
    flex-grow: 1;
    margin-left: var(--nav-width-collapsed);
    padding: 40px;
    width: calc(100% - var(--nav-width-collapsed));
    box-sizing: border-box;
    transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1), width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.navbar-expanded .main-content-wrapper {
    margin-left: var(--nav-width-expanded);
    width: calc(100% - var(--nav-width-expanded));
}

/* Base Components */
.card {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    border: 1px solid var(--border-color);
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-primary:hover {
    opacity: 0.8;
}

/* Registration/Login Form */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.input-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-family: inherit;
    box-sizing: border-box;
}

.input-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(186, 230, 253, 0.4);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .navbar {
        width: var(--nav-width-expanded);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    .navbar.active {
        transform: translateX(0);
    }
    .navbar .brand-name, .navbar .nav-text, .navbar .hub-name {
        opacity: 1;
        display: inline;
    }
    .navbar-brand {
        opacity: 1;
        pointer-events: auto;
    }
    .toggle-sidebar {
        display: none;
    }
    .main-content-wrapper {
        margin-left: 0;
        width: 100%;
        padding: 20px;
    }
    .menu-toggle {
        display: block;
        position: fixed;
        top: 20px;
        left: 20px;
        z-index: 1001;
        font-size: 2rem;
        cursor: pointer;
    }
}

@media (min-width: 769px) {
    .menu-toggle {
        display: none;
    }
}

/* Global UI Blocker */
#global-ui-blocker {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(255, 255, 255, 0.45);
    backdrop-filter: blur(2.5px);
    z-index: 10000; /* Higher than sidebar (1000) */
    display: none;
    align-items: center;
    justify-content: center;
    cursor: wait;
    pointer-events: all; /* Blocks mouse clicks */
    user-select: none;
    transition: opacity 0.2s;
}

#global-ui-blocker.active {
    display: flex;
}

.loader-spinner {
    width: 56px;
    height: 56px;
    border: 5px solid var(--primary-light);
    border-bottom-color: var(--primary);
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    box-shadow: 0 0 20px rgba(0,0,0,0.05);
}

@keyframes rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}