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

:root {
    --paper: #f4efe6;
    --paper-dark: #e7dccb;
    --ink: #2b2420;
    --ink-muted: #5a4f46;
    --border: #c8b9a6;
    --accent: #7a6653;
    --highlight: #efe3d3;
    --good: #2d6a4f;
    --good-bg: #d8f3dc;
    --warn: #7d5a00;
    --warn-bg: #fff3cd;
    --bad: #7a1c1c;
    --bad-bg: #fde8e8;
    --shadow: rgba(43, 36, 32, 0.15);
    --body-font: "Baskerville", "Garamond", "Palatino Linotype", "Times New Roman", serif;
    --display-font: "Didot", "Bodoni MT", "Bodoni 72", "Garamond", "Times New Roman", serif;
    --mono-font: "Courier New", Courier, monospace;
    --font-size-sm: 0.9rem;
    --font-size-md: 1.05rem;
    --font-size-lg: clamp(2rem, 4vw, 3rem);
}

body {
    font-family: var(--body-font);
    font-size: var(--font-size-md);
    color: var(--ink);
    background-color: var(--paper);
    background-image:
        linear-gradient(180deg, rgba(255, 255, 255, 0.6), rgba(255, 255, 255, 0)),
        repeating-linear-gradient(0deg, rgba(90, 79, 70, 0.06) 0px, rgba(90, 79, 70, 0.06) 1px, transparent 1px, transparent 4px),
        repeating-linear-gradient(90deg, rgba(90, 79, 70, 0.04) 0px, rgba(90, 79, 70, 0.04) 1px, transparent 1px, transparent 6px);
    min-height: 100vh;
}

.page {
    max-width: 1080px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 3rem;
}

/* Header */
.header {
    text-align: center;
    padding: 2rem 1.5rem;
    border: 2px solid var(--border);
    background: var(--highlight);
    box-shadow: 0 10px 24px var(--shadow);
    margin-bottom: 0;
}

.header h1 {
    font-family: var(--display-font);
    font-size: var(--font-size-lg);
    letter-spacing: 1px;
    margin-bottom: 0.4rem;
}

.header .subtitle {
    font-style: italic;
    color: var(--ink-muted);
    font-size: var(--font-size-md);
}

.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
    background: #fff6ea;
    margin-bottom: 0.6rem;
}

/* Nav */
.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    margin: 1.8rem 0 2rem;
}

.nav a {
    text-decoration: none;
    color: var(--ink);
    border: 1px solid var(--border);
    padding: 0.45rem 0.9rem;
    background: #fff8ee;
    text-transform: uppercase;
    font-size: var(--font-size-sm);
    letter-spacing: 1px;
}

.nav a.active {
    background: var(--paper-dark);
    border-color: var(--accent);
    color: var(--accent);
}

/* Sections */
.section {
    margin-bottom: 2rem;
    padding: 1.6rem;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.6);
    box-shadow: 0 6px 16px var(--shadow);
}

.section h2 {
    font-family: var(--display-font);
    font-size: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.8rem;
    color: var(--ink);
}

.section h3 {
    font-size: 1.1rem;
    margin: 1.2rem 0 0.5rem;
    color: var(--accent);
    font-style: italic;
}

.section p {
    line-height: 1.7;
    margin-bottom: 0.8rem;
}

.section ul, .section ol {
    padding-left: 1.4rem;
    line-height: 1.8;
    margin-bottom: 0.8rem;
}

.section li {
    margin-bottom: 0.2rem;
}

/* Callout */
.callout {
    border: 1px solid var(--accent);
    background: #fff6ea;
    padding: 1rem 1.2rem;
    margin-bottom: 2rem;
    font-style: italic;
}

.callout p {
    margin: 0;
    line-height: 1.7;
}

/* Stats bar */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 0.8rem;
    margin-bottom: 2rem;
}

.stat {
    border: 1px solid var(--border);
    background: var(--highlight);
    padding: 1rem;
    text-align: center;
}

.stat .num {
    font-family: var(--display-font);
    font-size: 1.8rem;
    color: var(--ink);
    display: block;
}

.stat .label {
    font-size: var(--font-size-sm);
    color: var(--ink-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Grid + Cards */
.grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.grid-2 {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(3, 1fr);
}

.card {
    border: 1px solid var(--border);
    padding: 1rem;
    background: var(--paper-dark);
}

.card h3 {
    font-size: 1.05rem;
    margin: 0 0 0.4rem;
    color: var(--ink);
    font-style: normal;
}

.card p {
    font-size: var(--font-size-sm);
    color: var(--ink-muted);
    margin: 0;
}

.card .card-tag {
    display: inline-block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--accent);
    border: 1px solid var(--border);
    padding: 0.1rem 0.35rem;
    margin-bottom: 0.4rem;
    background: #fff8ee;
}

/* Layer numbered cards */
.layer-card {
    border: 1px solid var(--border);
    padding: 1rem 1rem 1rem 1.2rem;
    background: var(--paper-dark);
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.layer-num {
    font-family: var(--display-font);
    font-size: 1.8rem;
    color: var(--accent);
    line-height: 1;
    min-width: 1.8rem;
    opacity: 0.6;
}

.layer-body h3 {
    font-size: 1.05rem;
    margin: 0 0 0.3rem;
    color: var(--ink);
    font-style: normal;
}

.layer-body p {
    font-size: var(--font-size-sm);
    color: var(--ink-muted);
    margin: 0;
    line-height: 1.6;
}

/* Tables */
.table-wrap {
    overflow-x: auto;
    margin: 0.5rem 0 0.2rem;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.table th,
.table td {
    border: 1px solid var(--border);
    padding: 0.55rem 0.7rem;
    text-align: left;
    vertical-align: top;
}

.table th {
    background: var(--paper-dark);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 1px;
    font-family: var(--body-font);
}

/* Status tags */
.tag {
    display: inline-block;
    padding: 0.1rem 0.45rem;
    font-size: 0.78rem;
    font-family: var(--body-font);
    letter-spacing: 0.5px;
    border-radius: 2px;
}

.tag-ok {
    background: var(--good-bg);
    color: var(--good);
    border: 1px solid #b7dfc4;
}

.tag-warn {
    background: var(--warn-bg);
    color: var(--warn);
    border: 1px solid #f0d080;
}

.tag-bad {
    background: var(--bad-bg);
    color: var(--bad);
    border: 1px solid #f5c0c0;
}

/* Code / pre */
.code {
    font-family: var(--mono-font);
    background: #f7f0e4;
    padding: 0.75rem 1rem;
    border: 1px dashed var(--accent);
    font-size: var(--font-size-sm);
    white-space: pre-wrap;
    line-height: 1.6;
}

/* Reading note below table */
.reading-note {
    font-size: var(--font-size-sm);
    color: var(--ink-muted);
    font-style: italic;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
}

/* Back / inline links */
.back-link {
    display: inline-block;
    margin-top: 0.5rem;
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid var(--accent);
    font-size: var(--font-size-sm);
}

/* Footer */
.footer {
    margin-top: 2rem;
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--ink-muted);
    border-top: 1px solid var(--border);
    padding-top: 1rem;
}

.footer a {
    color: var(--accent);
}

@media (max-width: 720px) {
    .page {
        padding: 1.5rem 1rem 2rem;
    }

    .section {
        padding: 1.1rem;
    }

    .grid-3 {
        grid-template-columns: 1fr;
    }
}