:root {
    --bg: #faf9f7;
    --surface: #ffffff;
    --border: #e8e6e3;
    --text: #1a1a1a;
    --text-soft: #4a4a4a;
    --muted: #737373;
    --accent: #c45c26;
    --accent-hover: #a04a1e;
    --accent-soft: rgba(196, 92, 38, 0.1);
    --font: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --gap-sm: 0.75rem;
    --gap-md: 1rem;
    --gap-lg: 1.5rem;
    --gap-xl: 2rem;
    --gap-2xl: 2.5rem;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-size: 1rem;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

button,
input,
textarea,
select {
    font-family: inherit;
}

body.issue-open .masthead {
    display: none;
}

.masthead {
    text-align: center;
    padding: var(--gap-2xl) var(--gap-lg) var(--gap-xl);
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

.masthead-logo {
    display: block;
    margin: 0 auto var(--gap-md);
    width: 56px;
    height: 56px;
}

.masthead h1 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
}

.masthead-description {
    color: var(--muted);
    font-size: 0.9375rem;
    margin: var(--gap-sm) 0 0;
    line-height: 1.45;
    max-width: 38em;
    margin-left: auto;
    margin-right: auto;
}

.disclaimer {
    margin-top: var(--gap-lg);
    padding: var(--gap-md) var(--gap-lg);
    background: rgba(196, 92, 38, 0.08);
    border: 1px solid rgba(196, 92, 38, 0.22);
    border-radius: 8px;
    font-size: 0.8125rem;
    line-height: 1.5;
    color: var(--text-soft);
    text-align: left;
    max-width: 36rem;
    margin-left: auto;
    margin-right: auto;
}

.disclaimer a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid rgba(196, 92, 38, 0.35);
}

.disclaimer a:hover {
    border-bottom-color: var(--accent);
}

.layout {
    flex: 1;
    min-height: 0;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    padding: 0 var(--gap-lg);
}

main {
    flex: 1;
    overflow-y: auto;
    padding: var(--gap-xl) 0 var(--gap-2xl);
    min-width: 0;
}

main .empty,
main .loading {
    color: var(--muted);
    text-align: center;
    padding: var(--gap-2xl) var(--gap-lg);
    font-size: 1rem;
}

.home-section {
    padding: 0;
}

.year-group {
    margin-bottom: var(--gap-2xl);
}

.year-group:last-child {
    margin-bottom: 0;
}

.year-title {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--muted);
    margin: 0 0 var(--gap-md);
}

.issue-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--gap-sm);
}

.issue-card {
    display: block;
    width: 100%;
    padding: var(--gap-md);
    text-align: left;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-soft);
    font-size: 0.875rem;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.issue-card:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(196, 92, 38, 0.12);
}

.issue-card-current {
    border-color: var(--accent);
    background: linear-gradient(135deg, var(--surface) 0%, rgba(196, 92, 38, 0.05) 100%);
    box-shadow: 0 4px 14px rgba(196, 92, 38, 0.12);
    padding: var(--gap-lg) var(--gap-xl);
    border-radius: 10px;
    font-size: 1rem;
}

.issue-card-current:hover {
    box-shadow: 0 6px 18px rgba(196, 92, 38, 0.18);
}

.issue-card-current .num {
    color: var(--accent);
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.issue-card-current .date {
    margin-bottom: 0.15rem;
}

.issue-card-current .read-time {
    font-size: 0.875rem;
    margin-top: 0.35rem;
}

.issue-card:not(.issue-card-current) {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.35rem;
}

.issue-card:not(.issue-card-current) .num {
    display: inline;
    font-weight: 600;
    color: var(--text);
    font-size: 1rem;
    margin-bottom: 0;
}

.issue-card:not(.issue-card-current) .date {
    display: inline;
    margin-bottom: 0;
}

.issue-card:not(.issue-card-current) .read-time {
    display: inline;
    font-size: 0.75rem;
    color: var(--muted);
    margin-top: 0;
}

.issue-card-current .num,
.issue-card-current .date,
.issue-card-current .read-time {
    display: block;
}

.issue-card .num {
    font-weight: 600;
    color: var(--text);
    font-size: 1rem;
}

.issue-card-current .num {
    color: var(--accent);
    margin-bottom: 0.25rem;
}

.issue-card .date {
    margin-bottom: 0.1rem;
}

.issue-card .read-time {
    font-size: 0.75rem;
    color: var(--muted);
}

.read-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--border);
    z-index: 10;
    display: none;
}

.read-progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 0 2px 2px 0;
    transition: width 0.12s ease-out;
}

.back-bar {
    display: flex;
    padding: var(--gap-md) 0 var(--gap-lg);
    border-bottom: 1px solid var(--border);
    margin-bottom: var(--gap-lg);
}

.back-bar-bottom {
    border-bottom: none;
    border-top: 1px solid var(--border);
    margin-top: var(--gap-xl);
    margin-bottom: 0;
    padding-top: var(--gap-lg);
}

.back-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0;
    background: none;
    border: none;
    color: var(--accent);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: color 0.2s;
}

.back-btn:hover {
    color: var(--accent-hover);
}

.issue-header {
    margin-bottom: var(--gap-lg);
    padding-bottom: var(--gap-lg);
    border-bottom: 1px solid var(--border);
}

.issue-header .meta {
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-bottom: 0.2rem;
}

.issue-header .issue-read-time {
    font-weight: 400;
    text-transform: none;
}

.issue-header .title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

.issue-header .issue-pdf-link {
    margin-top: var(--gap-md);
    font-size: 0.9375rem;
}

.issue-header .issue-pdf-link a.pdf-file-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.75rem;
    background: #f8f4f4;
    color: #c41e3a;
    text-decoration: none;
    border: 1px solid rgba(196, 30, 58, 0.3);
    border-radius: 6px;
    font-weight: 600;
    transition: background 0.2s, border-color 0.2s;
}

.issue-header .issue-pdf-link a.pdf-file-link:hover {
    background: #f0e8e8;
    border-color: #c41e3a;
}

.issue-header .issue-pdf-link .pdf-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.25rem;
    padding: 0.2rem 0.4rem;
    background: #c41e3a;
    color: #fff;
    font-weight: 700;
    font-size: 0.7em;
    letter-spacing: 0.04em;
    line-height: 1;
    border-radius: 2px;
}

.content-disclaimer {
    margin-bottom: var(--gap-lg);
    padding: var(--gap-md) var(--gap-lg);
    background: rgba(196, 92, 38, 0.08);
    border: 1px solid rgba(196, 92, 38, 0.22);
    border-radius: 8px;
    font-size: 0.8125rem;
    line-height: 1.5;
    color: var(--text-soft);
}

.content-disclaimer a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid rgba(196, 92, 38, 0.35);
}

.content-disclaimer a:hover {
    border-bottom-color: var(--accent);
}

.issue-toc {
    margin-bottom: var(--gap-lg);
    padding: var(--gap-lg);
    background: rgba(0, 0, 0, 0.04);
    border: 1px solid var(--border);
    border-radius: 10px;
}

.issue-toc-title {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin: 0 0 var(--gap-md);
}

.issue-toc .issue-toc-list {
    list-style: decimal;
    margin: 0 0 0 1.25rem;
    padding: 0;
}

.issue-toc .issue-toc-list .issue-toc-item {
    margin: 0.35rem 0 0 0;
    line-height: 1.5;
}

.issue-toc .issue-toc-sublist {
    list-style: disc;
    margin: 0.2rem 0 0 1rem;
    padding: 0 0 0 0.5rem;
}

.issue-toc .issue-toc-sublist .issue-toc-sublist {
    list-style: circle;
    margin: 0.2rem 0 0 1rem;
}

.issue-toc .issue-toc-sublist .issue-toc-sublist .issue-toc-sublist {
    list-style: square;
    margin: 0.2rem 0 0 1rem;
}

.issue-toc-item a {
    color: var(--text);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}

.issue-toc-sublist .issue-toc-item a {
    color: var(--text-soft);
    font-size: 0.9375rem;
}

.issue-toc-item a:hover {
    color: var(--accent);
    border-bottom-color: rgba(196, 92, 38, 0.35);
}

.issue-toc-item a.is-current {
    color: var(--accent);
    font-weight: 600;
    border-bottom-color: var(--accent);
}

.content {
    line-height: 1.75;
    font-size: 1.0625rem;
}

.content [id] {
    scroll-margin-top: 1.5rem;
}

.content h1 {
    font-size: 1.5rem;
    margin-top: 0;
    margin-bottom: 0.4rem;
    font-weight: 600;
    color: var(--text);
}

.content h2 {
    font-size: 1.25rem;
    margin-top: var(--gap-xl);
    margin-bottom: 0.4rem;
    font-weight: 600;
    color: var(--accent);
}

.content h3 {
    font-size: 1.1rem;
    margin-top: var(--gap-md);
    margin-bottom: 0.35rem;
    font-weight: 600;
    color: var(--text);
}

.content p {
    margin: 0 0 var(--gap-md);
    color: var(--text-soft);
}

.content ul,
.content ol {
    margin: 0 0 var(--gap-md);
    padding-left: 1.5rem;
    color: var(--text-soft);
}

.content li {
    margin: 0.3rem 0;
}

.content strong {
    color: var(--text);
}

.content a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid rgba(196, 92, 38, 0.35);
    transition: border-color 0.2s, color 0.2s;
}

.content a:hover {
    color: var(--accent-hover);
    border-bottom-color: var(--accent);
}

.content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: var(--gap-xl) 0;
}

.content pre,
.content code {
    background: rgba(0, 0, 0, 0.06);
    padding: 0.2em 0.45em;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: ui-monospace, 'Cascadia Code', Menlo, monospace;
}

.content pre {
    padding: var(--gap-lg);
    overflow-x: auto;
    margin: var(--gap-md) 0;
}

.content pre code {
    padding: 0;
    background: none;
}

.issue-nav-bottom {
    margin-top: var(--gap-xl);
    padding-top: var(--gap-lg);
    border-top: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    gap: var(--gap-xl);
}

.issue-nav-bottom .issue-nav-group {
    flex: 0 0 auto;
    min-width: 0;
}

.issue-nav-bottom .issue-nav-title {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    margin: 0 0 var(--gap-sm);
}

.issue-nav-bottom .issue-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap-sm);
}

.issue-nav-bottom .issue-card {
    padding: var(--gap-md) var(--gap-lg);
    font-size: 0.9rem;
    border-radius: 8px;
}

.issue-nav-bottom .issue-card .num {
    font-size: 0.95rem;
}

.issue-nav-bottom .issue-card .read-time {
    font-size: 0.75rem;
    margin-top: 0.2rem;
}

.scroll-to-top {
    position: fixed;
    bottom: var(--gap-lg);
    right: var(--gap-lg);
    z-index: 20;
    width: 2.75rem;
    height: 2.75rem;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--surface);
    color: var(--accent);
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    opacity: 0;
    visibility: hidden;
    transform: translateY(0.5rem);
    transition: opacity 0.2s, visibility 0.2s, transform 0.2s, color 0.2s, border-color 0.2s;
}

.scroll-to-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top:hover {
    color: var(--accent-hover);
    border-color: var(--accent);
}

@media (max-width: 768px) {
    .masthead h1 {
        font-size: 1.35rem;
    }

    .layout {
        padding: 0 var(--gap-md);
    }

    main {
        padding: var(--gap-lg) 0 var(--gap-xl);
    }

    .issue-cards {
        grid-template-columns: 1fr;
    }

    .scroll-to-top {
        bottom: var(--gap-md);
        right: var(--gap-md);
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.1rem;
    }
}

@media print {
    .read-progress-bar,
    .back-bar,
    .issue-nav,
    .scroll-to-top {
        display: none !important;
    }
}