:root {
    /* --- Light Mode Tokens (Default) --- */
    --primary-color: #0071e3;
    --primary-hover: #0077ed;
    --bg-color: #ffffff;
    --sidebar-bg: #f5f5f7;
    --border-color: #d2d2d7;
    --text-color: #1d1d1f;
    --text-secondary: #86868b;
    --card-bg: #ffffff;
    --code-bg: #f5f5f7;
    
    /* Doxygen Awesome Overrides (Light) */
    --body-background: var(--bg-color);
    --body-color: var(--text-color);
    --page-background: var(--bg-color);
    --page-color: var(--text-color);
    --page-secondary-color: var(--text-secondary);
    --separator-color: var(--border-color);
    --side-nav-background: var(--sidebar-bg);
    --code-background: var(--code-bg);
}

/* --- Dark Mode Tokens (Triggered by System) --- */
@media (prefers-color-scheme: dark) {
    :root:not(.light-mode) {
        --primary-color: #0a84ff;
        --primary-hover: #409eff;
        --bg-color: #161617;
        --sidebar-bg: #000000;
        --border-color: #303033;
        --text-color: #f5f5f7;
        --text-secondary: #a1a1a6;
        --card-bg: #1c1c1e;
        --code-bg: #000000;

        /* Doxygen Awesome Overrides (Dark) */
        --body-background: var(--bg-color);
        --body-color: var(--text-color);
        --page-background: var(--bg-color);
        --page-color: var(--text-color);
        --page-secondary-color: var(--text-secondary);
        --separator-color: var(--border-color);
        --side-nav-background: var(--sidebar-bg);
        --code-background: var(--code-bg);
    }
}

/* Maintain support for data-theme if set by scripts, but default to system */
[data-theme="dark"] {
    --primary-color: #0a84ff;
    --primary-hover: #409eff;
    --bg-color: #161617;
    --sidebar-bg: #000000;
    --border-color: #303033;
    --text-color: #f5f5f7;
    --text-secondary: #a1a1a6;
    --card-bg: #1c1c1e;
    --code-bg: #000000;
}

/* Global Styles */
body {
    background-color: var(--bg-color) !important;
    color: var(--text-color) !important;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif !important;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* 1. Header & Search Area */
#titlearea, .titlearea {
    background-color: var(--bg-color) !important;
    border-bottom: 1px solid var(--border-color) !important;
    padding: 30px 20px !important;
}

#projectname {
    font-size: 26px !important;
    font-weight: 600 !important;
    letter-spacing: -0.5px !important;
    color: var(--text-color) !important;
}

#projectbrief {
    color: var(--text-secondary) !important;
    margin-top: 4px !important;
}

#main-nav {
    background-color: var(--bg-color) !important;
    background-image: none !important;
    border-bottom: 1px solid var(--border-color) !important;
}

/* 2. Sidebar Styling */
#nav-tree {
    background-color: var(--sidebar-bg) !important;
    border-right: 1px solid var(--border-color) !important;
}

#nav-tree-contents {
    background-color: var(--sidebar-bg) !important;
}

#nav-tree .item {
    margin: 2px 8px !important;
    border-radius: 6px !important;
    color: var(--text-color) !important;
}

#nav-tree .item:hover {
    background-color: rgba(128, 128, 128, 0.1) !important;
    color: var(--primary-color) !important;
}

#nav-tree .selected {
    background-color: var(--primary-color) !important;
    color: #ffffff !important;
    font-weight: 500 !important;
}

#nav-tree .selected a {
    color: #ffffff !important;
}

/* 3. Main Page Custom Grid (Portal Design) */
.header-container {
    text-align: center;
    padding: 60px 0 40px 0;
}

.header-container h1 {
    font-size: 48px !important;
    font-weight: 700 !important;
    letter-spacing: -1px !important;
    color: var(--text-color) !important;
}

.header-container .subtitle {
    font-size: 20px !important;
    color: var(--text-secondary) !important;
    max-width: 600px;
    margin: 10px auto !important;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.card {
    background: var(--card-bg) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 16px;
    padding: 30px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.card h3 {
    margin-top: 0 !important;
    font-size: 22px !important;
    color: var(--text-color) !important;
}

.card p {
    color: var(--text-secondary) !important;
    font-size: 15px !important;
    line-height: 1.6 !important;
}

/* 4. Content Improvements */
.memitem {
    background-color: var(--card-bg) !important;
    border-radius: 12px !important;
    border: 1px solid var(--border-color) !important;
    overflow: hidden !important;
    margin-bottom: 24px !important;
}

.memproto {
    background-color: var(--sidebar-bg) !important;
    padding: 12px 15px !important;
    border-bottom: 1px solid var(--border-color) !important;
    color: var(--text-color) !important;
}

.memdoc {
    background-color: var(--card-bg) !important;
    color: var(--text-color) !important;
}

div.fragment {
    border-radius: 12px !important;
    background-color: var(--code-bg) !important;
    border: 1px solid var(--border-color) !important;
    padding: 15px !important;
}

/* Links */
a {
    color: var(--primary-color) !important;
    text-decoration: none !important;
}

a:hover {
    text-decoration: underline !important;
}

/* Search Box */
#MSearchBox {
    background-color: var(--bg-color) !important;
}

#MSearchField {
    background-color: var(--sidebar-bg) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 8px !important;
    color: var(--text-color) !important;
}

/* Hide explicit theme toggle - use system preference instead */
.doxygen-awesome-dark-mode-toggle {
    display: none !important;
}