/* ==========================================================================
   VARIABLES & THEME SETUP
   ========================================================================== */
:root {
    /* Dimensions & Spacing */
    --header-height: 52px;
    --max-content-width: 970px;
    --border-radius: 12px;
    
    /* Light Mode Palette */
    --bg-color: #ADD8E6;
    --text-color: #333;
    --text-color-secondary: #555;
    --text-color-headings: #111;
    --header-bg-color: rgba(173, 216, 230, 0.8);
    --header-text-color: #333;
    --default-page-bg-color: #f4f4f4;

    /* Components */
    --card-bg: rgba(255, 255, 255, 0.9);
    --level-list-item-bg: rgba(255, 255, 255, 0.9);
    --level-list-item-hover-bg: #ffffff;
    --level-settings-bg: #f9f9f9;
    --level-settings-border: #ddd;
    
    --button-bg-color: #e9e9e9;
    --button-text-color: #333;
    --button-hover-bg-color: #dcdcdc;
    --button-border-color: #ccc;
    
    /* Inputs & Tools */
    --input-bg-color: #fff;
    --input-border-color: #ccc;
    --input-focus-border-color: #6a5acd;
    
    /* Numpad Specifics */
    --numpad-btn-bg-color: #f9f9f9;
    --numpad-btn-text-color: #333;
    --numpad-btn-border-color: #ccc;
    --numpad-btn-hover-bg-color: #e0e0e0;
    --numpad-btn-active-bg-color: #d0d0d0;
    --numpad-enter-bg-color: #28a745;
    --numpad-enter-text-color: white;
    --numpad-enter-hover-bg-color: #218838;
    --numpad-bs-bg-color: #ffc107;
    --numpad-bs-text-color: #333;
    --numpad-bs-hover-bg-color: #e0a800;

    /* Branding & Feedback */
    --link-color: #6a5acd; /* Slate Blue */
    --link-hover-color: #8370d8;
    --feedback-correct-color: green;
    --feedback-incorrect-color: red;
    --feedback-info-color: orange;
    --feedback-simplify-color: #ffc107;

    /* Overlays & Splash */
    --splash-bg-color: rgba(0, 0, 0, 0.85);
    --splash-card-bg: #ffffff;
    --splash-text-color: #333333;
    --splash-overlay-color: rgba(0, 0, 0, 0.7);
    --splash-border: 1px solid #ccc;
    --countdown-overlay-bg: rgba(240, 240, 240, 0.97);
    --countdown-overlay-text: #333;
    --tooltip-bg: #333;
    --tooltip-text: white;
    --tape-bg-color: rgba(245, 245, 245, 0.85); 

    /* Assets */
    --logo-url: url('../images/logo-light-text.svg'); /* Adjusted path for CSS folder */
    --practice-bg-tint: #e0f2f1;
    --watermark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Ctext x='150' y='150' font-family='sans-serif' font-weight='900' font-size='40' text-anchor='middle' dominant-baseline='middle' transform='rotate(-30 150 150)' fill='black'%3EPRACTICE%3C/text%3E%3C/svg%3E");
}

html.dark-mode {
    --bg-color: #000020;
    --text-color: #e0e0e0;
    --text-color-secondary: #aaa;
    --text-color-headings: #f0f0f0;
    --header-bg-color: rgba(10, 10, 40, 0.75);
    --header-text-color: #e0e0e0;
    --default-page-bg-color: #1a1d2e;

    /* Components */
    --card-bg: rgba(26, 29, 46, 0.85);
    --level-list-item-bg: rgba(26, 29, 46, 0.8);
    --level-list-item-hover-bg: rgba(45, 50, 80, 0.9);
    --level-settings-bg: #3a3a3a;
    --level-settings-border: #555;

    --button-bg-color: #4f4f4f;
    --button-text-color: #e0e0e0;
    --button-hover-bg-color: #5f5f5f;
    --button-border-color: #666;

    /* Inputs & Tools */
    --input-bg-color: #3b3b3b;
    --input-border-color: #666;
    --input-focus-border-color: #b39ddb;
    
    /* Numpad Specifics */
    --numpad-btn-bg-color: #4a4a4a;
    --numpad-btn-text-color: #e0e0e0;
    --numpad-btn-border-color: #555;
    --numpad-btn-hover-bg-color: #585858;
    --numpad-btn-active-bg-color: #606060;
    --numpad-enter-bg-color: #2a7e3f;
    --numpad-enter-text-color: #e0e0e0;
    --numpad-enter-hover-bg-color: #34994A;
    --numpad-bs-bg-color: #b8860b;
    --numpad-bs-text-color: #e0e0e0;
    --numpad-bs-hover-bg-color: #cc950c;

    /* Branding & Feedback */
    --link-color: #9370db; /* Light Purple */
    --link-hover-color: #b39ddb;
    --feedback-correct-color: #77dd77;
    --feedback-incorrect-color: #ff6961;
    --feedback-info-color: #ffb347;
    --feedback-simplify-color: #ffca2c;

    /* Overlays & Splash */
    --splash-bg-color: rgba(30, 30, 30, 0.92);
    --splash-card-bg: #1e1e24;
    --splash-text-color: #e0e0e0;
    --splash-overlay-color: rgba(0, 0, 0, 0.85);
    --splash-border: 1px solid #333;
    --countdown-overlay-bg: rgba(20, 20, 20, 0.98);
    --countdown-overlay-text: #cccccc;
    --tooltip-bg: #e0e0e0;
    --tooltip-text: #222;
    --tape-bg-color: rgba(50, 50, 50, 0.85);

    /* Assets */
    --logo-url: url('../images/logo-light-text.svg'); /* Adjusted path */
    --practice-bg-tint: #10222B;
    --watermark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Ctext x='150' y='150' font-family='sans-serif' font-weight='900' font-size='40' text-anchor='middle' dominant-baseline='middle' transform='rotate(-30 150 150)' fill='white'%3EPRACTICE%3C/text%3E%3C/svg%3E");
}

/* --- STABLE FULL-SCREEN BACKGROUND --- */
body.menu-background::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center top; 
    background-image: 
        linear-gradient(rgba(0,0,0,0.15), rgba(0,0,0,0.15)), 
        url('../day-cityscape-background-min.jpg'); /* Adjusted path */
    transition: background-image 0.3s ease-in-out;
}

/* Dark Mode Image + Overlay */
html.dark-mode body.menu-background::before {
    background-image: 
        linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), 
        url('../cityscape-background-min.jpg'); /* Adjusted path */
}