/* === base.css - Modular segment of 8eacher design system === */

:root {
    --bg-page: #f5f4f0;        /* Soft warm-gray/alabaster background (clean and modern) */
    --bg-card: #fafaf7;        /* Soft bone-white container (completely reduces glare without being too yellow) */
    --bg-secondary: #ebeae4;   /* Soft warm metallic gray/cream for sidebars/hover buttons */
    --bg-tertiary: #dddbd3;    /* Clean warm-gray border/disabled states */
    
    --text-primary: #333230;   /* Soft premium charcoal-black for perfect reading comfort */
    --text-secondary: #706e68; /* Neutral warm slate-gray for subtexts */
    --text-tertiary: #a3a096;  /* Muted warm helper gray */
    
    --accent: #3c3a35;         /* Soft matte warm charcoal for primary accents/buttons */
    --accent-hover: #262524;   /* Clean deep black on hover */
    --accent-light: #ebeae4;   /* Soft cream-gray accent for active navigation */
    --accent-border: #4a4843;  /* Solid warm gray-dark border */
    
    --border-color: #e3e1d9;   /* Smooth warm tactile outline */
    --border-dark: #3c3a35;    /* Softer contrast dark border */
    
    --success-fill: #3c3a35;   /* Softer progress fill */
    --btn-primary-text: #fafaf7; /* Clean bone-white text on primary buttons */
    --btn-primary-shadow: #2b2a29; /* Softer tactile 3D button shadow */
    --bg-mobile-nav: rgba(245, 244, 240, 0.98); /* Translucent soft cream bg for mobile nav */
    
    --danger: #b0524b;
    --warning: #b38815;
    --success: #4a805a;
    --epic: #7b1fa2;
    --rare: #0288d1;

    /* Heatmap styling variables for Light Mode - subtle yet distinctive pastels to solid midtones */
    --heatmap-empty: #ebeae4;
    --heatmap-future: rgba(235, 234, 228, 0.4);

    --heatmap-create-1: #fdf1d2;
    --heatmap-create-2: #f6d27d;
    --heatmap-create-3: #d99e2b;

    --heatmap-review-1: #def7e7;
    --heatmap-review-2: #8cd9a4;
    --heatmap-review-3: #43a067;

    --heatmap-combined-1: linear-gradient(135deg, #fdf1d2, #def7e7);
    --heatmap-combined-2: linear-gradient(135deg, #f6d27d, #8cd9a4);
    --heatmap-combined-3: linear-gradient(135deg, #d99e2b, #43a067);

    /* Spacing System */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;

    /* Typography scale */
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-base: 1rem;
    --font-lg: 1.25rem;
    --font-xl: 1.5rem;
    --font-2xl: 2rem;

    /* Border Radii */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Transitions & Shadows */
    --transition-smooth: background-color 0.3s cubic-bezier(0.16, 1, 0.3, 1), 
                         color 0.3s cubic-bezier(0.16, 1, 0.3, 1), 
                         border-color 0.3s cubic-bezier(0.16, 1, 0.3, 1), 
                         box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1), 
                         transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: all 0.15s cubic-bezier(0.16, 1, 0.3, 1);
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body.dark-theme {
    --bg-page: #161615;        /* Eye-friendly warm slate dark background */
    --bg-card: #222220;        /* Soft lighter charcoal card */
    --bg-secondary: #2e2e2b;   /* Smooth dark slate gray */
    --bg-tertiary: #3c3a35;    /* Dark border/disabled state */
    
    --text-primary: #e6e4dc;   /* Warm cream text color to completely prevent glare */
    --text-secondary: #a3a096; /* Elegant muted warm slate gray */
    --text-tertiary: #706e68;  /* Lower contrast helper gray */
    
    --accent: #e6e4dc;         /* Warm cream primary for buttons/progress */
    --accent-hover: #f0eee6;   /* Bright cream hover state */
    --accent-light: #2e2e2b;   /* Dark active navigation background */
    --accent-border: #e6e4dc;  /* Solid cream accent border */
    
    --border-color: #3c3a35;   /* Dark warm border */
    --border-dark: #e6e4dc;    /* Strong contrast cream outline */
    
    --success-fill: #e6e4dc;   /* Warm cream progress bar fill */
    --btn-primary-text: #161615; /* Slate dark text on warm cream buttons! */
    --btn-primary-shadow: #9e9b90; /* Beveled dark cream shadow for 3D buttons in dark mode */
    --bg-mobile-nav: rgba(22, 22, 21, 0.98); /* Translucent dark slate bg for mobile nav */
    
    --danger: #b55e5e;
    --warning: #ab9351;
    --success: #488b72;
    --epic: #ab47bc;
    --rare: #29b6f6;

    /* Heatmap styling variables for Dark Mode - premium deep jewel tones and golds */
    --heatmap-empty: rgba(255, 255, 255, 0.06);
    --heatmap-future: rgba(255, 255, 255, 0.018);

    --heatmap-create-1: #4d3c1a;
    --heatmap-create-2: #94722a;
    --heatmap-create-3: #e5b955;

    --heatmap-review-1: #1a3322;
    --heatmap-review-2: #346644;
    --heatmap-review-3: #52b76e;

    --heatmap-combined-1: linear-gradient(135deg, #4d3c1a, #1a3322);
    --heatmap-combined-2: linear-gradient(135deg, #94722a, #346644);
    --heatmap-combined-3: linear-gradient(135deg, #e5b955, #52b76e);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
}

/* Global Premium Transition Rules for Seamless Color/Background Switching */
body, 
.top-header, 
.sidebar, 
.nav-btn, 
.glass, 
.btn, 
.input-group textarea, 
.input-group select, 
#practice-type-select, 
.dashboard-hero, 
.stat-pill, 
.category-card, 
.category-card-icon,
.category-card-fraction,
.progress-bar-container,
.progress-bar-fill,
.card-face, 
.letter-box, 
.manage-card, 
.custom-checkbox, 
.type-tag, 
.art-backdrop, 
.art-clock, 
.art-laptop, 
.art-laptop-screen, 
.art-laptop-bar, 
.art-laptop-base, 
.art-desk-line {
    transition: var(--transition-smooth);
}

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

body {
    font-family: 'Outfit', -apple-system, sans-serif;
    background-color: var(--bg-page);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}



/* Standard Tactile Panels */
.glass {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    box-shadow: inset 0 -2px 0 var(--border-color);
    border-radius: 16px;
}

/* Typography */
h1, h2, h3, h4 { 
    font-weight: 800; 
    line-height: 1.15; 
    letter-spacing: -0.025em; /* Premium Header Spacing Hack (-2.5%) */
}
.logo { 
    font-size: 1.4rem; 
    font-weight: 800; 
    letter-spacing: 0.5px; 
    text-transform: uppercase; 
    color: var(--text-primary);
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), color 0.2s, text-shadow 0.2s;
    user-select: none;
    display: inline-block;
}
.logo span { 
    font-weight: 300; 
    color: var(--text-secondary); 
    transition: color 0.2s;
}
.logo:hover {
    transform: scale(1.06) translateY(-1px);
    color: #e5b955; /* Premium golden highlight on hover! */
    text-shadow: 0 4px 12px rgba(229, 185, 85, 0.25);
}
.logo:hover span {
    color: var(--text-primary);
}
.logo:active {
    transform: scale(0.96) translateY(0px);
}



/* Tag Styling */
.type-tag {
    display: inline-block; 
    padding: 3px 8px; 
    background: var(--bg-secondary) !important; 
    color: var(--text-primary) !important; 
    border: 2px solid var(--border-color);
    border-radius: 8px; 
    font-size: 0.75rem; 
    font-weight: 700;
    margin-bottom: 8px;
    text-transform: uppercase;
}

/* Animations */
@keyframes slideUp { from { opacity: 0; transform: translateY(15px); } to { opacity: 1; transform: translateY(0); } }
.slide-up { animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards; opacity: 0; }



/* Custom Sleek Scrollbars for Canvas Containers */
#create-map-canvas-container::-webkit-scrollbar,
#edit-map-canvas-container::-webkit-scrollbar,
#practice-map-canvas-container::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

#create-map-canvas-container::-webkit-scrollbar-track,
#edit-map-canvas-container::-webkit-scrollbar-track,
#practice-map-canvas-container::-webkit-scrollbar-track {
    background: transparent;
}

#create-map-canvas-container::-webkit-scrollbar-thumb,
#edit-map-canvas-container::-webkit-scrollbar-thumb,
#practice-map-canvas-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

#create-map-canvas-container::-webkit-scrollbar-thumb:hover,
#edit-map-canvas-container::-webkit-scrollbar-thumb:hover,
#practice-map-canvas-container::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}



/* Animations */
.animate-pop-in {
    animation: customPopIn 0.25s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.animate-pop-out {
    animation: customPopOut 0.2s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes customPopIn {
    from {
        transform: scale(0.9) translateY(10px);
        opacity: 0;
    }
    to {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

@keyframes customPopOut {
    from {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
    to {
        transform: scale(0.95) translateY(10px);
        opacity: 0;
    }
}

.custom-modal-body {
    margin-bottom: 24px;
    text-align: center;
}

.custom-modal-body p {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.5;
}

.custom-modal-footer {
    display: flex;
    justify-content: center;
    gap: 12px;
}



/* Performance Optimizations & GPU Compositing Layer Promotion */
#create-map-viewport,
#edit-map-viewport,
#practice-map-viewport,
.map-node,
.node-connector-plus,
.node-explanation-tooltip {
    will-change: left, top, transform;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Tactile Shake Keyframes for Failures/Errors */
@keyframes node-shake-anim {
    0%, 100% { transform: translateX(0) translate3d(0, 0, 0); }
    15%, 45%, 75% { transform: translateX(-6px) translate3d(0, 0, 0); }
    30%, 60%, 90% { transform: translateX(6px) translate3d(0, 0, 0); }
}

.node-shake {
    animation: node-shake-anim 0.45s cubic-bezier(.36, .07, .19, .97) both;
}

/* Sidebar macOS Dock style hover translation */
.nav-btn {
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), background-color 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s;
}
.nav-btn:hover {
    transform: scale(1.05) translateX(3px);
}



/* ==========================================================================
   Visual Dimensionality & Layout Standardization
   ========================================================================== */

/* Unified Card and Panel Standards */
.glass, .stats-card, .category-card, .manage-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    box-shadow: inset 0 -2px 0 var(--border-color);
    border-radius: 16px;
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

/* Card Hover/Click Standard Signifiers */
.category-card.clickable:hover,
.stats-card:hover,
.manage-card:hover {
    transform: translateY(-2px);
    background-color: var(--bg-secondary);
}

.category-card.clickable:active,
.manage-card:active {
    transform: translateY(2px);
    box-shadow: none;
}

/* Mini Cards for stats/metrics dashboard grids */
.stats-mini-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    box-shadow: inset 0 -2px 0 var(--border-color);
    border-radius: 12px;
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 95px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.stats-mini-card:hover {
    background-color: var(--bg-tertiary);
}

/* Standardized Form Inputs & Selects */
.input-field {
    width: 100%; 
    padding: 12px 14px; 
    border-radius: 12px;
    background: var(--bg-card); 
    border: 2px solid var(--border-color);
    color: var(--text-primary); 
    font-family: inherit; 
    font-size: 0.95rem; 
    font-weight: 400;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    line-height: 1.5;
    outline: none;
    box-sizing: border-box;
    height: 48px;
}

.input-field:focus { 
    outline: none; 
    border-color: var(--text-primary); 
    box-shadow: 0 0 0 3px var(--border-color);
}

/* Flex Row & Layout Helpers */
.input-row {
    display: flex;
    gap: 12px;
    align-items: center;
    width: 100%;
}
.input-row .input-field {
    flex: 1;
}

.btn-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    width: 100%;
}
.btn-row .btn {
    flex: 1;
    min-width: 120px;
}