:root {
    /* Day Theme (Default) */
    --bg-color: #f7f9fc;
    --card-bg: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --accent-color: #3b82f6;
    --border-color: #e5e7eb;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --bubble-bg-1: #dbeafe;
    /* blue-100 */
    --bubble-bg-2: #d1fae5;
    /* green-100 */
    --bubble-bg-3: #fce7f3;
    /* pink-100 */
    --bubble-bg-4: #fef3c7;
    /* yellow-100 */
}

[data-theme='night'] {
    /* Night Theme (Soft Grey, not Black) */
    --bg-color: #e5e7eb;
    /* Light grey background */
    --card-bg: #f3f4f6;
    /* Slightly lighter grey for cards */
    --text-main: #111827;
    /* Dark grey text */
    --text-muted: #4b5563;
    --accent-color: #60a5fa;
    --border-color: #d1d5db;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --bubble-bg-1: #d1d5db;
    --bubble-bg-2: #d1d5db;
    --bubble-bg-3: #d1d5db;
    --bubble-bg-4: #d1d5db;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.theme-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px -1px var(--shadow-color), 0 2px 4px -1px var(--shadow-color);
    transition: all 0.3s ease;
}

.theme-card:hover {
    box-shadow: 0 10px 15px -3px var(--shadow-color), 0 4px 6px -2px var(--shadow-color);
    transform: translateY(-2px);
}

.navbar-theme {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.bubble {
    transition: all 0.3s ease;
}

.bubble:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
    /* Cyan/Blue glow */
}

/* Markdown Styles */
.prose h1 {
    color: var(--text-main);
    font-weight: 800;
    margin-top: 1.5em;
    margin-bottom: 0.5em;
    font-size: 1.8em;
}

.prose h2 {
    color: var(--text-main);
    font-weight: 700;
    margin-top: 1.2em;
    margin-bottom: 0.5em;
    font-size: 1.4em;
}

.prose h3 {
    color: var(--text-main);
    font-weight: 600;
    margin-top: 1em;
    margin-bottom: 0.5em;
    font-size: 1.2em;
}

.prose p {
    margin-bottom: 1em;
    line-height: 1.6;
    color: var(--text-main);
}

/* Markdown List Styles */
.prose ul {
    padding-left: 0;
    margin-bottom: 1.5em;
}

.md-list-item {
    margin-bottom: 0.75em;
    padding-left: 1.5em;
    /* Space for custom bullet */
    position: relative;
    line-height: 1.6;
}

/* Custom bullet for list items derived from * ... */
.md-list-item::before {
    content: "•";
    color: var(--accent-color);
    font-weight: bold;
    position: absolute;
    left: 0;
    font-size: 1.2em;
    line-height: 1.4;
}

/* Highlight Important Text */
/* Standard Bold Text (Clean) */
.prose strong {
    color: var(--text-main);
    font-weight: 700;
}

/* Sideline Headings */
.prose h2,
.prose h3 {
    border-left: 4px solid var(--accent-color);
    padding-left: 0.75rem;
    line-height: 1.3;
    margin-top: 1.5em;
    margin-bottom: 0.75em;
}

.prose blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem;
    color: var(--text-muted);
    font-style: italic;
    margin: 1.5rem 0;
}

/* Markdown Table Styles */
.prose table {
    width: 100%;
    margin-top: 1em;
    margin-bottom: 1em;
    border-collapse: collapse;
    font-size: 0.9em;
}

.prose th {
    background-color: var(--border-color);
    color: var(--text-main);
    font-weight: 600;
    text-align: left;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
}

.prose td {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
}

.prose tr:nth-child(even) {
    background-color: rgba(0, 0, 0, 0.02);
}

/* Consistent navigation link styling across all pages */
.nav-link-text {
    color: #4b5563;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color 0.2s ease;
    text-decoration: none;
}

.nav-link-text:hover {
    color: #3b82f6;
}