/* ============================================================================
   1. COLOR PALETTE CONFIGURATION
   ============================================================================
   INSTRUCTIONS: Uncomment ONE block below to set the site accent colors.
   - accent-light: Color used in Light Mode (Darker for contrast)
   - accent-dark:  Color used in Dark Mode  (Lighter/Pastel for contrast)
*/

:root {
    /* --- OPTION 1: FOREST GREEN --- */
    /*
    --accent-light: #198754;
    --accent-dark:  #75b798;
    */

    /* --- OPTION 2: OCEAN BLUE --- */
    /*
    --accent-light: #0d6efd;
    --accent-dark:  #6ea8fe;
    */

    /* --- OPTION 3: CHERRY RED --- */
    /*
    --accent-light: #dc3545;
    --accent-dark:  #ea868f;
    */

    /* --- OPTION 4: ROYAL PURPLE --- */
    
    --accent-light: #6610f2;
    --accent-dark:  #a985f9;
    

    /* --- OPTION 5: SOLAR ORANGE --- */
    /*
    --accent-light: #fd7e14;
    --accent-dark:  #feb272;
    */

    /* --- OPTION 6: TEAL / CYAN --- */
    /*
    --accent-light: #0aa2c0;
    --accent-dark:  #70e3fa;
    */

    /* --- OPTION 7: HOT PINK --- */
    /*
    --accent-light: #d63384;
    --accent-dark:  #f38ab4;
    */

    /* --- OPTION 8: SLATE GRAY (Monochrome) --- */
    /*
    --accent-light: #495057;
    --accent-dark:  #adb5bd;
    */
}

/* ============================================================================
   2. GLOBAL BASE COLOR VARIABLES
   ============================================================================ */
:root {
    /* --- Dark Mode Palette --- */
    /* Level 0: Main Background (Deepest) */
    --bg-dark: #0f1114; 
    /* Level 1: Surface (Navbar/Footer) */
    --surface-dark: #16191d;
    /* Level 2: Cards (Floating content) */
    --card-dark: #212529; 
    
    --text-dark: #dbdbdb;
    --text-secondary-dark: #adb5bd;
    /* New Tertiary: Darker grey (good for metadata, footnotes) */
    --text-tertiary-dark: #6c757d; 
    
    --border-dark: #2d3238;

    /* --- Light Mode Palette --- */
    /* Level 0: Main Background (Darker grey/blue to help white cards pop) */
    --bg-light: #e8ecf0; 
    /* Level 1: Surface (Navbar/Footer) */
    --surface-light: #ffffff;
    /* Level 2: Cards */
    --card-light: #ffffff;
    
    --text-light: #575d62;
    --text-secondary-light: #6c757d;
    /* New Tertiary: Lighter grey (good for metadata, footnotes) */
    --text-tertiary-light: #9ca3af; 
    
    --border-light: #dee2e6;
}

/* ============================================================================
   3. THEME LOGIC (Bootstrap Integration)
   ============================================================================ */

/* Light Mode Mapping */
[data-bs-theme="light"] {
    --main-accent: var(--accent-light);
    --on-accent-text: #ffffff;
    
    --bs-body-bg: var(--bg-light);
    --bs-body-color: var(--text-light);
    --surface-bg: var(--surface-light);
    --card-bg: var(--card-light);

    --text-secondary: var(--text-secondary-light);
    --text-tertiary: var(--text-tertiary-light);

    --bs-link-color: var(--main-accent);
    --bs-link-hover-color: var(--main-accent);
    --bs-border-color: var(--border-light);
}

/* Dark Mode Mapping */
[data-bs-theme="dark"] {
    --main-accent: var(--accent-dark);
    --on-accent-text: #000000;

    --bs-body-bg: var(--bg-dark);
    --bs-body-color: var(--text-dark);
    --surface-bg: var(--surface-dark);
    --card-bg: var(--card-dark);

    --text-secondary: var(--text-secondary-dark);
    --text-tertiary: var(--text-tertiary-dark);

    --bs-link-color: var(--main-accent);
    --bs-link-hover-color: #ffffff;
    --bs-border-color: var(--border-dark);
}

/* ============================================================================
   4. COMPONENT OVERRIDES & UTILITIES
   ============================================================================ */

/* --- Base & Typography --- */
body {
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--bs-body-color);
}

/* Override Bootstrap's text-muted to use your secondary variable */
.text-muted, .text-secondary {
    color: var(--text-secondary) !important;
}

/* New Utility for tertiary text */
.text-tertiary {
    color: var(--text-tertiary) !important;
}

.text-accent {
    color: var(--main-accent) !important;
}

/* --- Surfaces (Navbar & Footer) --- */
nav.navbar, footer {
    background-color: var(--surface-bg) !important;
    border-color: var(--bs-border-color) !important;
}

/* --- Cards --- */
.card {
    background-color: var(--card-bg) !important;
    border: 1px solid var(--bs-border-color) !important;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}
.card-header {
    background-color: var(--surface-bg) !important; /* Slightly distinct from card body */
    border-bottom: 1px solid var(--bs-border-color) !important;
}

/* --- Borders & Dividers --- */
hr {
    border-color: var(--bs-border-color);
    opacity: 0.5;
}

/* Map generic Bootstrap borders to your theme border */
.border, .border-top, .border-bottom, .border-start, .border-end {
    border-color: var(--bs-border-color) !important;
}

/* --- Inputs --- */
.form-control, .form-select {
    background-color: var(--surface-bg); /* Use surface, not body, for input depth */
    border: 1px solid var(--bs-border-color);
    color: var(--bs-body-color);
}

.form-control::placeholder {
    color: var(--text-tertiary);
}

.form-control:focus, .form-select:focus {
    background-color: var(--surface-bg);
    border-color: var(--main-accent);
    color: var(--bs-body-color);
    box-shadow: 0 0 0 0.25rem rgba(var(--main-accent), 0.25); /* Note: requires RGB vars usually, falling back to browser default glow if not parsed */
}

/* --- Badges --- */
/* Custom badge that adapts to mode (Light text on surface background) */
.badge-theme {
    background-color: var(--surface-bg);
    color: var(--main-accent);
    border: 1px solid var(--bs-border-color);
}

/* --- Navbar Links --- */
.navbar-brand {
    color: var(--main-accent) !important;
}

.navbar-nav .nav-link {
    color: var(--bs-body-color); /* Defaults to body color */
    transition: color 0.2s;
}

.navbar-nav .nav-link:hover, 
.navbar-nav .nav-link.active {
    color: var(--main-accent);
}

/* Specific override for the bold Journal/Library links */
.nav-link.fw-bold {
    color: var(--bs-body-color) !important;
}
.nav-link.fw-bold:hover {
    color: var(--main-accent) !important;
}

/* --- Buttons Override --- */

/* 1. Solid Primary Buttons */
.btn-primary {
    background-color: var(--main-accent) !important;
    border-color: var(--main-accent) !important;
    color: var(--on-accent-text) !important;
}

/* Hover/Focus State for Solid Buttons */
.btn-primary:hover, 
.btn-primary:focus, 
.btn-primary:active, 
.btn-primary.active {
    background-color: var(--main-accent) !important;
    border-color: var(--main-accent) !important;
    color: var(--on-accent-text) !important;
    /* Brightens the button slightly on hover to indicate interaction */
    filter: brightness(1.15); 
}

/* 2. Outline Buttons */
.btn-outline-primary {
    color: var(--main-accent) !important;
    border-color: var(--main-accent) !important;
}

/* Hover/Focus State for Outline Buttons */
.btn-outline-primary:hover, 
.btn-outline-primary:focus, 
.btn-outline-primary:active, 
.btn-outline-primary.active {
    background-color: var(--main-accent) !important;
    border-color: var(--main-accent) !important;
    color: var(--on-accent-text) !important;
    filter: brightness(1.15);
}

/* --- Theme Toggle Button --- */
#theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
}
#theme-icon { font-size: 1.1rem; }