:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --primary: #005293; 
    --primary-hover: #006ec4; 
    --border: #e2e8f0;
    --font-mono: "JetBrains Mono", monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    padding: 3rem 1rem;
}

.container {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
}

header {
    margin-bottom: 2.5rem;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.35rem;
}

.breadcrumb {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
    font-weight: bold;
}

/* Flat Panel Layout for files */
.content-box {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 2rem;
}

.tree-item {
    padding: 0.85rem 1.25rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.tree-item:last-child {
    border-bottom: none;
}

.tree-item a {
    color: var(--text-main);
    text-decoration: none;
    width: 100%;
}

.tree-item:hover {
    background-color: #eff6ff;
}

.tree-item:hover a {
    color: var(--primary);
}

/* Code Area Layout */
pre.code-area {
    margin: 0;
    padding: 1.5rem;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    counter-reset: line;
    line-height: 1.6;
}

.code-line {
    display: block;
}

.code-line:before {
    counter-increment: line;
    content: counter(line);
    inline-size: 2.5rem;
    display: inline-block;
    border-right: 1px solid var(--border);
    margin-right: 1rem;
    color: var(--text-muted);
    text-align: right;
    padding-right: 0.5rem;
    user-select: none;
}

/* Flat README Box */
.readme-box {
    padding: 1.5rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    line-height: 1.6;
}

.readme-header {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
    font-weight: bold;
}

.readme-content {
    white-space: pre-wrap;
}

/* Align FontAwesome icons cleanly inside layouts */
.breadcrumb i,
.tree-item i,
.readme-header i {
    vertical-align: -5%;
}