:root {
    /* Base Theme Variables - Can be overridden by classes */
    
    /* Default (Dark Blue) */
    --color-primary: #1A3C5E; /* Dark Blue */
    --color-primary-hover: #132B45;
    --color-accent: #4A90E2; /* Lighter Blue Accent */
    
    --color-bg-body: #F4F6F8; /* Cool Grey background */
    --color-bg-sidebar: #0F253E; /* Deep Dark Blue */
    --color-bg-card: #FFFFFF;
    --color-bg-input: #E8ECEF;
    
    --color-text-main: #2C3E50;
    --color-text-muted: #607D8B;
    --color-text-light: #E0E6ED;
    
    --color-border: #CFD8DC;
    
    /* Functional Colors */
    --color-success: #2E7D32;
    --color-danger: #C62828;
    --color-warning: #F9A825;
    --color-info: #1565C0;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(26, 60, 94, 0.05);
    --shadow-md: 0 4px 8px rgba(26, 60, 94, 0.1);
    --shadow-lg: 0 8px 16px rgba(26, 60, 94, 0.15);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.2s ease;
}

/* Wooden Theme Override */
body.theme-wooden {
    --color-bg-body: #F9F5EB;
    --color-bg-sidebar: #4A3B32;
    --color-bg-card: #FFFFFF;
    --color-bg-input: #F0EAE0;
    
    --color-primary: #8B5A2B;
    --color-primary-hover: #6F451E;
    --color-accent: #D4A373;
    
    --color-text-main: #2C1E16;
    --color-text-muted: #6D5D53;
    --color-text-light: #F4EBE2;
    
    --color-border: #D7CCC8;
    
    --shadow-sm: 0 2px 4px rgba(62, 39, 35, 0.05);
    --shadow-md: 0 4px 8px rgba(62, 39, 35, 0.1);
    --shadow-lg: 0 8px 16px rgba(62, 39, 35, 0.15);
}

/* Forest Theme Override */
body.theme-forest {
    --color-bg-body: #F1F8E9;
    --color-bg-sidebar: #1B5E20;
    --color-bg-card: #FFFFFF;
    --color-bg-input: #DCEDC8;
    
    --color-primary: #2E7D32;
    --color-primary-hover: #1B5E20;
    --color-accent: #81C784;
    
    --color-text-main: #1A331A;
    --color-text-muted: #558B2F;
    --color-text-light: #F1F8E9;
    
    --color-border: #C5E1A5;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--color-bg-body);
    color: var(--color-text-main);
    line-height: 1.6;
    font-size: 16px;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-bg-sidebar);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

/* Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast);
    border: none;
    font-size: 0.95rem;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-text-light);
}

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

.btn-block {
    display: block;
    width: 100%;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--color-text-muted);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-bg-input);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-accent);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* Layout */
.app-wrapper {
    display: flex;
    min-height: 100vh;
    flex-direction: column;
}

@media (min-width: 768px) {
    .app-wrapper {
        flex-direction: row;
    }
}

/* Sidebar */
.sidebar {
    background-color: var(--color-bg-sidebar);
    color: var(--color-text-light);
    width: 100%;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
    transition: transform var(--transition-fast);
}

@media (min-width: 768px) {
    .sidebar {
        width: 250px;
        min-height: 100vh;
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        overflow-y: auto;
    }
}

.sidebar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-accent);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.nav-item {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--color-text-light);
    opacity: 0.8;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-item:hover, .nav-item.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-text-light);
    opacity: 1;
}

/* Mobile Toggle */
.mobile-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background-color: var(--color-bg-sidebar);
    color: var(--color-text-light);
}

@media (min-width: 768px) {
    .mobile-header {
        display: none;
    }
}

/* Main Content */
.main-content {
    flex-grow: 1;
    padding: var(--spacing-md);
    background-color: var(--color-bg-body);
}

@media (min-width: 768px) {
    .main-content {
        margin-left: 250px; /* Sidebar width */
        padding: var(--spacing-xl);
    }
}

/* Header */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.page-title {
    margin-bottom: 0;
    font-size: 1.75rem;
    color: var(--color-bg-sidebar);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-bg-sidebar);
    font-weight: bold;
}

/* Dashboard Stats */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

@media (min-width: 600px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.stat-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background-color: rgba(139, 90, 43, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    font-size: 1.5rem;
}

.stat-info h3 {
    margin-bottom: 0;
    font-size: 1.5rem;
    color: var(--color-text-main);
}

.stat-info p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin: 0;
}

/* Login Page */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    background-color: var(--color-bg-sidebar); /* Dark background for contrast */
}

.login-card {
    width: 100%;
    max-width: 400px;
    background-color: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.login-brand {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    font-weight: 700;
}

/* Icons (Simple CSS Shapes or Unicode) */
.icon-dashboard::before { content: "📊"; }
.icon-account::before { content: "➕"; }
.icon-publish::before { content: "📝"; }
.icon-posts::before { content: "📂"; }
.icon-analytics::before { content: "📈"; }
.icon-settings::before { content: "⚙️"; }
.icon-logout::before { content: "🚪"; }

/* Mobile Sidebar Toggle */
#sidebar-toggle {
    display: none;
}

@media (max-width: 767px) {
    .sidebar {
        display: none; /* Hidden by default on mobile */
    }
    
    #sidebar-toggle:checked ~ .app-wrapper .sidebar {
        display: flex;
        position: fixed;
        top: 60px; /* Below header */
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 100;
    }
    
    .mobile-header {
        position: sticky;
        top: 0;
        z-index: 101;
    }
}

/* Helpers */
.text-center { text-align: center; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.platform-select {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.platform-option {
    border: 1px solid var(--color-border);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    background: var(--color-bg-input);
    transition: all var(--transition-fast);
}

.platform-option.selected {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.platform-option:hover {
    border-color: var(--color-primary);
}

/* File Upload */
.file-upload {
    border: 2px dashed var(--color-border);
    padding: var(--spacing-xl);
    text-align: center;
    border-radius: var(--radius-md);
    background-color: var(--color-bg-input);
    cursor: pointer;
    color: var(--color-text-muted);
}
.file-upload:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Desktop Sidebar Toggle Button */
.btn-icon-only {
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    background: transparent;
    color: var(--color-bg-sidebar);
}

.btn-icon-only:hover {
    background-color: rgba(0,0,0,0.05);
}

@media (max-width: 767px) {
    #desktop-sidebar-toggle {
        display: none;
    }
}

/* Collapsed Sidebar State (Desktop Only) */
@media (min-width: 768px) {
    body.sidebar-collapsed .sidebar {
        width: 80px;
    }

    body.sidebar-collapsed .main-content {
        margin-left: 80px;
    }

    body.sidebar-collapsed .brand-text,
    body.sidebar-collapsed .nav-text {
        display: none;
    }

    body.sidebar-collapsed .sidebar-brand {
        justify-content: center;
    }
    
    body.sidebar-collapsed .nav-item {
        justify-content: center;
        padding: var(--spacing-md) 0;
    }
    
    body.sidebar-collapsed .nav-item span[class^='icon-'] {
        font-size: 1.5rem;
    }

    body.sidebar-collapsed #sidebar-plan-widget {
        display: none !important;
    }
}


.icon-reaction::before { content: '??'; }
.icon-cut::before { content: '??'; }