:root {
    --background: #f7f7f5;
    --surface: #ffffff;
    --text: #1f1f1f;
    --muted: #636363;
    --accent: #2f3e73;
    --border: #d9d9d4;
}

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

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
    line-height: 1.6;
}

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

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.page {
    max-width: 1100px;
    margin: 0 auto;
    padding: 3rem 1.5rem 4rem 0rem;
    display: flex;
    gap: 2.2rem;
}

.content {
    flex: 1;
    min-width: 0;
}

.menu {
    width: 190px;
}

.menu nav {
    position: sticky;
    top: 3rem;
    display: flex;
    flex-direction: column;
    padding-right: 1rem;
    border-right: 1px solid var(--border);
    gap: 0.75rem;
}

.menu a {
    font-size: 0.95rem;
    letter-spacing: 0.01em;
    color: var(--muted);
}

.menu a.active {
    color: var(--accent);
    font-weight: 600;
}

.overline {
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.75rem;
    color: var(--muted);
    margin: 0;
}

.profile {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.profile-text {
    flex: 1;
    text-align: left;
    max-width: 560px;
}

.profile-social {
    margin-top: 1.1rem;
}

.profile .social-links {
    justify-content: flex-start;
}

.profile-text .subtitle {
    display: block;
}

.profile h1 {
    font-size: 2.75rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    margin: 0.4rem 0 0.8rem;
}

.subtitle {
    margin: 0.2rem 0;
    color: var(--muted);
    font-size: 1rem;
}

.portrait {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--border);
    background: var(--surface);
    margin-left: auto;
}

section {
    margin-bottom: 2rem;
}

.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.75rem 1.8rem;
}

.panel h2 {
    margin: 0 0 1rem;
    font-size: 1.4rem;
    font-weight: 500;
    letter-spacing: 0.01em;
}

.plain-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.plain-list li + li {
    margin-top: 1.2rem;
}

.plain-list strong {
    font-weight: 600;
}

.tag-list {
    list-style: none;
    padding: 0;
    margin: 1.25rem 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.tag-list li {
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.45rem 0.85rem;
    font-size: 0.85rem;
    color: var(--muted);
}

.muted {
    color: var(--muted);
    font-size: 0.95rem;
}

.site-footer {
    margin-top: 3rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    font-size: 0.95rem;
    text-align: center;
}

.social-links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 1.2rem;
    align-items: center;
    justify-content: center;
}

.social-links li {
    margin: 0;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--muted);
}

.social-links a:hover {
    color: var(--accent);
    text-decoration: none;
}

.social-links svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

.last-updated {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--muted);
}

.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    margin: 0;
    font-size: 2.2rem;
    letter-spacing: 0.01em;
    font-weight: 500;
}

.page-header p {
    margin: 0.6rem 0 0;
    color: var(--muted);
}

.entry {
    margin-bottom: 1.8rem;
}

.entry:last-child {
    margin-bottom: 0;
}

.entry-title {
    font-weight: 600;
    margin: 0 0 0.4rem;
    font-size: 1.1rem;
}

.entry-meta {
    margin: 0 0 0.6rem;
    color: var(--muted);
    font-size: 0.95rem;
}

.entry-summary {
    margin: 0;
}

.entry-links {
    margin-top: 0.6rem;
}

.entry-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
}

.entry-links a + a {
    margin-left: 1rem;
}

.entry-links svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

.callout {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.download-link {
    display: inline-block;
    margin-top: 0.8rem;
    padding: 0.6rem 1.2rem;
    border: 1px solid var(--accent);
    border-radius: 999px;
    color: var(--accent);
    font-size: 0.95rem;
}

.download-link:hover {
    text-decoration: none;
    background: rgba(47, 62, 115, 0.08);
}

.materials-section {
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--background);
    padding: 0.95rem 1rem;
}

.materials-section + .materials-section {
    margin-top: 0.9rem;
}

.materials-section summary {
    cursor: pointer;
    font-weight: 600;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--text);
}

.materials-section summary::-webkit-details-marker {
    display: none;
}

.materials-section summary::after {
    content: "+";
    color: var(--muted);
    font-size: 1rem;
    line-height: 1;
}

.materials-section[open] summary::after {
    content: "-";
    color: var(--accent);
}

.materials-section summary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}

.materials-content {
    margin-top: 0.75rem;
}

.materials-content p {
    margin: 0 0 0.7rem;
    color: var(--muted);
}

@media (max-width: 900px) {
    .page {
        flex-direction: column;
        padding: 2.5rem 1.25rem 3rem;
    }

    .menu {
        width: 100%;
    }

    .menu nav {
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 1rem;
        padding-right: 0;
        padding-left: 0;
        border-right: none;
        border-top: 1px solid var(--border);
        padding-top: 1.2rem;
    }

    .profile {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 540px) {
    body {
        font-size: 0.98rem;
    }

    .page {
        padding: 2rem 1.25rem 2.5rem;
    }

    .panel {
        padding: 1.4rem 1.5rem;
    }
}