:root {
    --ink: #1c2733;
    --paper: #f7f5f0;
    --card: #ffffff;
    --accent: #12324f;
    --accent-2: #2e6e8e;
    --gold: #b98a2f;
    --muted: #5b6b7a;
    --line: #dcd6ca;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
    color: var(--ink);
    background: var(--paper);
    line-height: 1.65;
}

.wrap { max-width: 62rem; margin: 0 auto; padding: 0 1.25rem; }
.wrap.narrow { max-width: 44rem; }

.skip-link {
    position: absolute; left: -9999px; top: 0;
    background: var(--accent); color: #fff; padding: .5rem 1rem;
}
.skip-link:focus { left: 0; z-index: 10; }

/* Masthead */
.masthead { background: var(--accent); color: #fff; border-bottom: 4px solid var(--gold); }
.masthead-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .9rem 1.25rem; flex-wrap: wrap; }
.wordmark { display: flex; align-items: center; gap: .7rem; text-decoration: none; color: inherit; }
.wordmark-mark {
    display: inline-flex; align-items: center; justify-content: center;
    width: 2.6rem; height: 2.6rem; border-radius: 50%;
    background: var(--gold); color: var(--accent);
    font-size: 1.5rem; font-weight: bold; font-style: normal;
}
.wordmark-text { font-size: 1.35rem; letter-spacing: .02em; }
.wordmark-accent { color: var(--gold); }
.wordmark-kicker { display: block; font-size: .72rem; color: #c9d4de; }
.nav { display: flex; align-items: center; gap: 1.1rem; flex-wrap: wrap; }
.nav a { color: #dfe7ee; text-decoration: none; font-size: .95rem; padding: .15rem 0; border-bottom: 2px solid transparent; }
.nav a:hover { color: #fff; }
.nav a.is-current { color: #fff; border-bottom-color: var(--gold); }
.nav a.nav-cta {
    background: var(--gold); color: var(--accent); padding: .35rem .9rem;
    border-radius: 999px; font-weight: bold;
}
.nav a.nav-cta:hover { filter: brightness(1.08); color: var(--accent); }
.nav-id { color: #aebdc9; font-style: italic; }

/* Hero */
.hero { background: linear-gradient(180deg, #ffffff00 0%, #efe9dd 100%); padding: 4rem 0 3rem; }
.hero h1 { font-size: clamp(1.9rem, 4vw, 3rem); margin: 0 0 1rem; max-width: 40ch; }
.hero h1 em { color: var(--accent-2); }
.lede { font-size: 1.15rem; max-width: 60ch; color: var(--muted); }
.hero-cta { margin-top: 1.5rem; }

.btn {
    display: inline-block; text-decoration: none; cursor: pointer;
    padding: .6rem 1.4rem; border-radius: 999px; font-size: 1rem;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-2); }

/* Feature grid */
.feature-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
    gap: 1.25rem; padding-top: 2.5rem; padding-bottom: 3rem;
}
.card {
    background: var(--card); border: 1px solid var(--line); border-radius: 10px;
    padding: 1.4rem 1.5rem;
}
.card h2 { margin-top: 0; font-size: 1.2rem; color: var(--accent); }

/* Generic page sections */
main section { padding-top: 2rem; padding-bottom: 2rem; }
h1 { font-size: 2rem; color: var(--accent); }
h2 { font-size: 1.3rem; color: var(--accent); }
code {
    background: #ece7db; padding: .1rem .35rem; border-radius: 4px;
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .88em;
}
.fine { color: var(--muted); font-size: .85rem; }

.auth-door p { max-width: 58ch; }
.auth-cta { margin-top: 1.5rem; }

/* Footer */
.colophon { background: var(--accent); color: #c9d4de; margin-top: 3rem; padding: 2rem 0; }
.colophon a { color: #fff; }
.colophon-links { display: flex; gap: 1.2rem; flex-wrap: wrap; margin: .75rem 0; }
.colophon .fine { color: #8fa2b3; }

@media (prefers-reduced-motion: no-preference) {
    html { scroll-behavior: smooth; }
}

/* ---- Directory: shelves, cards, badges -------------------------------------- */
.shelf-tabs { display: flex; gap: .5rem; flex-wrap: wrap; margin: 1.5rem 0; }
.shelf-tabs a {
    text-decoration: none; color: var(--muted); padding: .35rem .9rem;
    border: 1px solid var(--line); border-radius: 999px; font-size: .92rem;
    background: var(--card);
}
.shelf-tabs a:hover { color: var(--accent); }
.shelf-tabs a.is-current { background: var(--accent); color: #fff; border-color: var(--accent); }
.shelf-tabs .count { opacity: .65; font-size: .85em; }

.problem-list { display: grid; gap: 1rem; margin: 1.5rem 0 2.5rem; }
.problem-card {
    background: var(--card); border: 1px solid var(--line); border-radius: 10px;
    padding: 1.2rem 1.4rem; border-left-width: 5px;
}
.problem-card.shelf-unsolved { border-left-color: var(--gold); }
.problem-card.shelf-recently_solved_by_ai { border-left-color: var(--accent-2); }
.problem-card.shelf-historic { border-left-color: var(--muted); }
.problem-card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.problem-title { font-size: 1.15rem; font-weight: bold; color: var(--accent); text-decoration: none; }
.problem-title:hover { text-decoration: underline; }
.problem-meta { margin-bottom: 0; }

.badge {
    font-size: .72rem; letter-spacing: .06em; text-transform: uppercase;
    padding: .15rem .6rem; border-radius: 999px; white-space: nowrap; font-family: sans-serif;
}
.badge-open { background: #f6ecd7; color: #8a6414; }
.badge-ai { background: #e3eef5; color: #1d5b80; }
.badge-historic { background: #ece9e2; color: #5b6250; }

.stats-row { display: flex; gap: 2.5rem; flex-wrap: wrap; margin: 0 auto; padding-top: .5rem; }
.stat strong { font-size: 2rem; display: block; color: var(--accent); }
.stat span { color: var(--muted); font-size: .9rem; }

.problem-section { margin: 2rem 0; }
.prose p:first-child { margin-top: 0; }
.callout {
    background: #f6ecd7; border: 1px solid #e5d5a8; border-radius: 10px; padding: 1.2rem 1.5rem;
}
.solve-account {
    background: var(--card); border: 1px solid var(--line); border-left: 5px solid var(--accent-2);
    border-radius: 10px; padding: 1.2rem 1.5rem;
}

/* Footer: sibling-project links sit apart from site pages */
.colophon-sep { width: 1px; height: 1rem; background: #3d5a75; align-self: center; }
.colophon-links a { opacity: .85; }
.colophon-links a:hover { opacity: 1; }

/* Related problems */
.relation-list { list-style: none; padding: 0; margin: .5rem 0; }
.relation-list li { padding: .35rem 0; border-bottom: 1px dotted var(--line); }
.rel-label {
    display: inline-block; min-width: 9rem; color: var(--muted);
    font-size: .85rem; font-style: italic;
}

/* Curation dashboard */
.admin-nav { display:flex; gap:1rem; align-items:center; padding:.5rem 0 1.25rem; border-bottom:1px solid var(--line); margin-bottom:1.25rem; }
.admin-nav a { text-decoration:none; color:var(--muted); }
.admin-nav a.is-current { color:var(--accent); font-weight:bold; }
.admin-form label { display:block; margin-bottom: .9rem; }
.admin-form input[type=text], .admin-form textarea, .admin-form select, .admin-form input[type=number], .admin-form input[type=url] {
    font: inherit; padding:.45rem .6rem; border:1px solid var(--line); border-radius:6px; background:#fff;
}
.admin-table { width:100%; border-collapse:collapse; }
.admin-table td, .admin-table th { text-align:left; padding:.4rem .6rem; border-bottom:1px solid var(--line); }
button.linklike { background:none; border:none; color:#8a1f1f; cursor:pointer; font-size:1rem; }
.queue-form textarea { font-family: ui-monospace, Menlo, monospace; font-size:.85rem; }

/* Curation history */
.revisions summary { cursor: pointer; color: var(--muted); font-size: .9rem; }
.revision-list { list-style: none; padding: .5rem 0 0; margin: 0; }
.revision-list li { padding: .3rem 0; font-size: .88rem; }

/* Recently resolved */
.resolved-list { list-style: none; padding: 0; margin: .5rem 0 1rem; }
.resolved-list li { padding: .45rem 0; border-bottom: 1px dotted var(--line); display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.resolved-list a { font-weight: bold; color: var(--accent); text-decoration: none; }
.resolved-list a:hover { text-decoration: underline; }
.resolved-meta { color: var(--muted); font-size: .85rem; font-style: italic; white-space: nowrap; }