@import url('https://fonts.googleapis.com/css2?family=Merriweather:ital,wght@0,300;0,400;0,700;1,400&family=Raleway:wght@400;600;700&display=swap');

:root {
    --navy:      #2b2ba1;
    --accent:    #1e6fa5;
    --text:      #222;
    --muted:     #555;
    --rule:      #ddd;
    --max-width: 860px;
}

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

html, body {
    background: #fff;
    color: var(--text);
    font-family: 'Merriweather', Georgia, serif;
    font-size: 17px;
    line-height: 1.85;
}

/* ── Header ─────────────────────────────────────────────────── */

.site-header {
    background: var(--navy);
    padding: 1.4rem 0;
}

.site-header .inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: baseline;
    gap: 1.5rem;
}

.site-name {
    font-family: 'Raleway', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 0.03em;
    text-decoration: none;
}

.site-name:hover {
    text-decoration: none;
    color: rgba(255,255,255,0.85);
}

.site-tagline {
    font-family: 'Raleway', sans-serif;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.5);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

/* ── Main content wrapper ───────────────────────────────────── */

.content-wrap {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2.75rem 2rem 4rem;
}

/* ── Page heading ───────────────────────────────────────────── */

.page-heading {
    font-family: 'Raleway', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    color: var(--navy);
    padding-bottom: 0.65rem;
    border-bottom: 2px solid var(--navy);
    margin-bottom: 1.75rem;
}

/* ── Intro text ─────────────────────────────────────────────── */

.intro {
    margin-bottom: 2.75rem;
}

/* ── Typography ─────────────────────────────────────────────── */

p {
    margin-bottom: 1.1rem;
    font-size: 1rem;
    color: var(--text);
}

h2 {
    font-family: 'Raleway', sans-serif;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--navy);
    margin: 0 0 0.6rem;
}

h3,
.subheader {
    font-family: 'Raleway', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--navy);
    margin: 1.75rem 0 0.6rem;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

ul, ol {
    padding-left: 1.5rem;
    margin-bottom: 1.1rem;
}

li {
    font-size: 1rem;
    margin-bottom: 0.3rem;
    color: var(--text);
}

/* ── Article index entries ──────────────────────────────────── */

.article-list {
    margin-top: 0.5rem;
}

.article-entry {
    padding: 2.25rem 0;
    overflow: hidden;
}

.article-entry h2 {
    margin-bottom: 0.85rem;
}

.article-entry h2 a {
    color: var(--accent);
}

.article-thumb {
    float: left;
    width: 220px;
    max-width: 38%;
    height: auto;
    margin: 0.2rem 1.75rem 0.75rem 0;
    border-radius: 2px;
    display: block;
}

hr.article-divider {
    border: none;
    border-top: 1px solid var(--rule);
    margin: 0;
}

/* ── Article page images ────────────────────────────────────── */

.imageleft {
    float: left;
    max-width: 45%;
    height: auto;
    margin: 0.25rem 1.75rem 1rem 0;
}

.imageright {
    float: right;
    max-width: 45%;
    height: auto;
    margin: 0.25rem 0 1rem 1.75rem;
}

.container {
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.textcontent {
    /* No overflow:hidden here — text wraps naturally around floated images
       and returns to the full left margin once it clears the float. */
}

/* ── Back link (article pages) ──────────────────────────────── */

.back-link {
    display: inline-block;
    font-family: 'Raleway', sans-serif;
    font-size: 0.9rem;
    color: var(--muted);
    margin-bottom: 2rem;
}

.back-link:hover {
    color: var(--accent);
    text-decoration: none;
}

/* ── Footer ─────────────────────────────────────────────────── */

footer {
    background: var(--navy);
    color: rgba(255,255,255,0.4);
    text-align: center;
    padding: 1.5rem 1rem;
    font-family: 'Raleway', sans-serif;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    margin-top: 2rem;
}

/* ── Code blocks (replaces textarea snippets from JSP) ─────── */

pre {
    background: #f4f4f4;
    border-left: 3px solid var(--navy);
    padding: 0.9rem 1.25rem;
    margin: 1.25rem 0;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ── Side-by-side image pairs ───────────────────────────────── */

.image-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    margin: 1.5rem 0;
}

.image-row img {
    max-width: 100%;
    height: auto;
}

/* ── Math / equation lists ──────────────────────────────────── */

.equation {
    list-style: none;
    padding: 0.5rem 0 0.5rem 2rem;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.95rem;
    margin: 0.75rem 0;
}

.equation li {
    font-size: 0.95rem;
    color: var(--text);
    margin-bottom: 0.2rem;
}

/* ── Inline images within paragraph text ───────────────────── */

.inline-img {
    vertical-align: middle;
}

/* ── Standalone figure images inside article body ───────────── */

.figure-img {
    display: block;
    margin: 1.5rem auto;
    max-width: 100%;
    height: auto;
}

/* ── Data tables ────────────────────────────────────────────── */

table.data-table {
    border-collapse: collapse;
    margin: 1rem 0;
    font-family: 'Raleway', sans-serif;
    font-size: 0.9rem;
}

table.data-table th,
table.data-table td {
    border: 1px solid var(--rule);
    padding: 0.4rem 0.75rem;
}

table.data-table th {
    background: var(--navy);
    color: #fff;
    font-weight: 600;
    text-align: center;
}

table.data-table tr:nth-child(even) td {
    background: #f8f8f8;
}

/* ── Note / info callout box ────────────────────────────────── */

.note-box {
    background: #f0f4f8;
    border-left: 4px solid var(--accent);
    padding: 0.75rem 1.1rem;
    margin: 1.5rem 0;
    font-family: 'Raleway', sans-serif;
    font-size: 0.9rem;
    color: var(--muted);
}

/* ── Simulator form (non-functional in static version) ──────── */

.sim-form {
    border: 2px solid var(--rule);
    padding: 1rem 1.25rem;
    margin: 1.25rem 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 2rem;
    align-items: center;
    font-family: 'Raleway', sans-serif;
    font-size: 0.9rem;
    opacity: 0.6;
}

.sim-form label {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    font-weight: 600;
    color: var(--navy);
}

.sim-form select {
    font-size: 0.9rem;
    padding: 0.2rem 0.4rem;
}

/* ── Responsive ─────────────────────────────────────────────── */

@media (max-width: 600px) {
    html, body {
        font-size: 16px;
    }

    .content-wrap {
        padding: 1.75rem 1.25rem 3rem;
    }

    .article-thumb,
    .imageleft,
    .imageright {
        float: none;
        width: 100%;
        max-width: 100%;
        margin: 0 0 1rem 0;
    }
}