/**
 * Shared styles for static pages: About, Preface, Feedback.
 * DRY: one file, body modifiers for layout width. Reader uses reader.css only.
 */
:root{
  --nb-font-ui:'DM Sans',system-ui,-apple-system,'Segoe UI',Tahoma,sans-serif;
  --nb-text:#2a2826;
  --nb-muted:#6b6560;
  --nb-accent:#7a5f2a;
  --nb-accent-hover:#5c4a1a;
  --nb-border:#e2ddd4;
  --nb-code-bg:#f3f1ed;
}
*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:var(--nb-font-ui);
  background:#fff;
  color:var(--nb-text);
  line-height:1.65;
  padding:24px clamp(16px,4vw,48px) 48px;
  max-width:56rem;
  margin:0 auto;
  font-weight: 300;
}
/* Layout variants */
body.nb-page--narrow{max-width:28rem;line-height:1.5}
body.nb-page--preface{max-width:56rem;font-weight:300}

a{color:var(--nb-accent);text-decoration:none;border-bottom:1px solid transparent}
a:hover{color:var(--nb-accent-hover);border-bottom-color:#c9a96e}
.back{display:inline-block;margin-bottom:22px;font-size:13px}
h1{font-size:1.65rem;font-weight:400;color:var(--nb-accent);letter-spacing:0.5px;margin-bottom:10px}
.hint{font-size:14px;color:var(--nb-muted);margin-bottom:20px}

/* Long-form article (About) */
h2{font-size:1.1rem;font-weight:600;color:var(--nb-accent);letter-spacing:0.35px;margin:28px 0 12px;padding-bottom:6px;border-bottom:1px solid #ece8e0}
.nb-page--article p{font-size:18px;margin-bottom:14px;color:#3a3834}
.source-note{font-size:13px;color:var(--nb-muted);background:#faf8f4;border:1px solid #ece8e0;border-radius:8px;padding:14px 16px;margin-bottom:26px;line-height:1.5}
.source-note strong{color:#5c4a1a}
blockquote{margin:14px 0 18px;padding:12px 16px 12px 18px;border-left:3px solid #c9a96e;background:#faf9f6;font-size:14px;color:#3a3834}
blockquote p{margin-bottom:10px}
blockquote p:last-child{margin-bottom:0}
cite{display:block;margin-top:8px;font-size:13px;color:var(--nb-muted);font-style:normal}
ol,ul{padding-left:1.35rem;margin-bottom:14px;font-size:15px;color:#3a3834}
li{margin-bottom:8px}
.vocab-list{list-style:none;padding-left:0}
.vocab-list li{padding:6px 0;border-bottom:1px solid #f0ebe3}
.vocab-list li:last-child{border-bottom:none}

/* Preface content box */
.content-box{padding:16px 18px;border:1px dashed #d8d1c6;border-radius:8px;background:#faf9f6}
.content-box p{font-size:18px;color:#3a3834;margin-bottom:12px}
.content-box p:last-child{margin-bottom:0}

/* Feedback form */
body.nb-page--narrow h1{font-size:1.5rem;margin-bottom:8px}
body.nb-page--narrow .hint{font-size:13px;margin-bottom:22px}
label{display:block;font-size:12px;font-weight:600;color:var(--nb-accent);margin-bottom:6px}
input,textarea{width:100%;padding:9px 12px;border:1px solid #d4cec3;border-radius:6px;font-size:14px;font-family:var(--nb-font-ui);color:var(--nb-text)}
input:focus,textarea:focus{outline:none;border-color:#a68b4a;box-shadow:0 0 0 2px rgba(166,139,74,0.15)}
textarea{min-height:140px;resize:vertical;margin-bottom:16px}
.field{margin-bottom:14px}
button[type=submit]{padding:10px 18px;font-size:13px;font-family:var(--nb-font-ui);border-radius:6px;cursor:pointer;border:1px solid #d4cec3;background:#c9a96e;color:#fff;border-color:#b8986d}
button[type=submit]:hover{background:#b8986d}
code{font-size:0.92em;background:var(--nb-code-bg);padding:1px 5px;border-radius:4px}

footer{margin-top:40px;padding-top:18px;border-top:1px solid var(--nb-border);font-size:13px;color:#8a8580}
body.nb-page--narrow footer{margin-top:28px}