/* ============================================
   UPPCS Notes - Dark Theme Stylesheet
   Apply to all chapter files for consistent theming
   ============================================ */

:root {
    /* Light mode colors (default) */
    --bg-color: #f8fafc;
    --text-color: #334155;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --heading-color: #1e293b;
}

/* Dark theme colors */
[data-theme="dark"] {
    --bg-color: #0f172a;
    --text-color: #e2e8f0;
    --card-bg: #1e293b;
    --border-color: #334155;
    --heading-color: #e2e8f0;
}

/* Base styles with theme variables */
body {
    background: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.card {
    background: var(--card-bg);
    transition: background-color 0.3s ease;
}

h2, h3 {
    color: var(--heading-color);
}

table th,
table td {
    border-color: var(--border-color);
}

/* Theme toggle button */
.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 25px;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 1.2rem;
    color: white;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.3);
}

/* Header needs to be positioned relative for toggle button */
header {
    position: relative;
}

/* Dark mode specific adjustments for highlights */
[data-theme="dark"] .highlight {
    /* Each chapter can override this with their own color */
    opacity: 0.9;
}

[data-theme="dark"] table th {
    /* Darker table headers in dark mode */
    opacity: 0.85;
}