/* --- VARIABLES --- */
:root {
    --bg-body: #ffffff;
    --bg-sidebar: #f7f9fc;
    --text-main: #333333;
    --text-muted: #666666;
    --accent: #2563eb; /* Data Blue */
    --code-bg: #1e1e1e;
    --border: #e2e8f0;
    --font-ui: 'Inter', sans-serif;
    --font-code: 'JetBrains Mono', monospace;
}

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

body {
    font-family: var(--font-ui);
    color: var(--text-main);
    background-color: var(--bg-body);
    line-height: 1.7;
}

/* LAYOUT */
.doc-layout {
    display: flex;
    min-height: 100vh;
}

/* SIDEBAR */
.doc-sidebar {
    width: 280px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    position: fixed;
    height: 100vh;
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.brand {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

    .brand i {
        color: var(--accent);
    }

.doc-nav {
    list-style: none;
    flex: 1;
}

    .doc-nav li {
        margin-bottom: 0.5rem;
    }

    .doc-nav a {
        text-decoration: none;
        color: var(--text-muted);
        font-size: 0.95rem;
        display: block;
        padding: 0.5rem 0;
        transition: 0.2s;
    }

        .doc-nav a:hover, .doc-nav a.active {
            color: var(--accent);
            font-weight: 600;
            padding-left: 5px;
        }

.sidebar-footer {
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.back-link, .github-link {
    display: block;
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    color: var(--text-main);
    font-weight: 600;
}

.github-link {
    color: var(--accent);
}

/* CONTENT AREA */
.doc-content {
    margin-left: 280px;
    padding: 4rem 6rem;
    max-width: 1000px;
    width: 100%;
}

section {
    margin-bottom: 5rem;
    scroll-margin-top: 2rem;
}

.tag {
    background: #dbeafe;
    color: var(--accent);
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
    font-family: var(--font-code);
}

h1 {
    font-size: 3rem;
    margin: 1rem 0;
    line-height: 1.1;
}

h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.lead {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    max-width: 700px;
}

/* STATS */
.stats-grid {
    display: flex;
    gap: 2rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: white;
    border: 1px solid var(--border);
    padding: 1.5rem;
    border-radius: 8px;
    min-width: 180px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
}

    .stat-card .label {
        display: block;
        font-size: 0.8rem;
        color: var(--text-muted);
        margin-bottom: 0.5rem;
    }

    .stat-card .value {
        display: block;
        font-size: 1.2rem;
        font-weight: 700;
        color: var(--accent);
        font-family: var(--font-code);
    }

/* DIAGRAM */
.diagram-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-sidebar);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.diagram-step {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

    .diagram-step i {
        font-size: 2rem;
        color: var(--accent);
        background: white;
        width: 60px;
        height: 60px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        border: 1px solid var(--border);
    }

    .diagram-step strong {
        font-size: 0.9rem;
    }

    .diagram-step span {
        font-size: 0.75rem;
        color: var(--text-muted);
    }

.arrow {
    color: #ccc;
    font-weight: 700;
    font-size: 1.5rem;
}

/* CODE BLOCKS */
.code-window {
    background: var(--code-bg);
    color: #d4d4d4;
    border-radius: 8px;
    overflow: hidden;
    margin: 2rem 0;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    font-family: var(--font-code);
}

.window-bar {
    background: #2d2d2d;
    padding: 0.6rem 1rem;
    font-size: 0.8rem;
    color: #888;
    border-bottom: 1px solid #333;
}

pre {
    padding: 1.5rem;
    overflow-x: auto;
}

code {
    font-family: inherit;
    font-size: 0.9rem;
}

/* Syntax Highlighting Colors */
.kw {
    color: #569cd6;
}
/* Blue for keywords */
.func {
    color: #dcdcaa;
}
/* Yellow for functions */
.str {
    color: #ce9178;
}
/* Orange for strings */
.num {
    color: #b5cea8;
}
/* Green for numbers */
.comment {
    color: #6a9955;
}
/* Green for comments */

/* SIMULATED GRAPH */
.graph-container {
    background: white;
    border: 1px solid var(--border);
    padding: 2rem;
    border-radius: 8px;
    margin-top: 2rem;
}

.graph-header {
    text-align: center;
    margin-bottom: 2rem;
    font-weight: 700;
}

.chart-area {
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    height: 300px;
    border-left: 2px solid #ddd;
    border-bottom: 2px solid #ddd;
    padding-bottom: 10px;
}

.bar {
    width: 10%;
    background: linear-gradient(to top, var(--accent), #60a5fa);
    border-radius: 4px 4px 0 0;
    position: relative;
    transition: height 1s ease;
}

    .bar:hover {
        opacity: 0.8;
    }

    .bar span {
        position: absolute;
        bottom: -30px;
        left: 50%;
        transform: translateX(-50%);
        font-size: 0.75rem;
        color: var(--text-muted);
        width: 100px;
        text-align: center;
    }

/* RESULT BOX */
.result-box {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    padding: 2rem;
    border-radius: 8px;
}

    .result-box ul {
        list-style: none;
    }

    .result-box li {
        margin-bottom: 1rem;
        display: flex;
        align-items: center;
        gap: 1rem;
        color: #166534;
    }

    .result-box i {
        font-size: 1.2rem;
    }

/* RESPONSIVE */
@media (max-width: 900px) {
    .doc-layout {
        flex-direction: column;
    }

    .doc-sidebar {
        position: relative;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .doc-content {
        margin-left: 0;
        padding: 2rem;
    }

    .diagram-box {
        flex-direction: column;
        gap: 1rem;
    }

    .arrow {
        transform: rotate(90deg);
    }
}