/* Physics in BPT: the bridge from standard physics terms to the book's own. */
.phys-wrap { padding-top: 28px; padding-bottom: 64px; }
.phys-head h1 { margin: 6px 0 8px; font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.15; }
.phys-head .lede { margin: 0 0 6px; }
.phys-crumb { font-size: 0.9rem; margin: 0 0 14px; }
.phys-wrap a { color: var(--phase-1); text-decoration: none; }
.phys-wrap a:hover { color: var(--text); }
.phys-note { color: var(--text-mute); font-size: 0.9rem; margin: 10px 0 0; }

.phys-rel { display: inline-block; font-size: 0.78rem; padding: 2px 10px; border-radius: 999px; border: 1px solid var(--line); color: var(--text-dim); white-space: nowrap; }
.phys-rel.same     { border-color: rgba(53, 232, 224, 0.45); color: var(--phase-1); }
.phys-rel.explains { border-color: rgba(176, 92, 196, 0.55); color: #d39be0; }
.phys-rel.splits   { border-color: rgba(255, 51, 102, 0.5);  color: #ff7d9b; }
.phys-rel.builds   { border-color: rgba(232, 200, 90, 0.5);  color: #e8c85a; }
.phys-rel.new      { border-color: rgba(232, 234, 239, 0.4); color: var(--text); }

.phys-legend { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 10px; margin: 22px 0 8px; padding: 0; list-style: none; }
.phys-legend li { background: var(--bg-card); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; font-size: 0.88rem; color: var(--text-dim); }
.phys-legend li .phys-rel { margin-bottom: 6px; }

.phys-search { margin: 18px 0 6px; }
.phys-search input { width: 100%; max-width: 520px; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg-raise); color: var(--text); font-size: 1rem; }
.phys-search input:focus { outline: none; border-color: var(--phase-1); }
.phys-count { color: var(--text-mute); font-size: 0.85rem; margin: 6px 0 0; }

.phys-group h2 { font-size: 1.15rem; margin: 30px 0 10px; color: var(--text-dim); font-weight: 600; }
.phys-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 10px; }
.phys-item { background: var(--bg-card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.phys-item:hover, .phys-item:focus-within { border-color: rgba(53, 232, 224, 0.35); }
.phys-wrap .phys-item a.phys-name { font-weight: 600; color: var(--text); font-size: 1.02rem; }
.phys-item .phys-arrow { color: var(--text-mute); margin: 0 6px; }
.phys-item .phys-bpt { color: var(--phase-1); }
.phys-item p { margin: 6px 0 0; color: var(--text-dim); font-size: 0.9rem; }
.phys-item .phys-rel { margin-top: 8px; }
.phys-empty { color: var(--text-mute); margin-top: 18px; }

.phys-term-sub { font-size: 1.15rem; color: var(--text-dim); margin: 0 0 10px; }
.phys-term-sub strong { color: var(--phase-1); font-weight: 600; }
.phys-sec { margin: 26px 0 0; }
.phys-sec h2 { font-size: 1.1rem; margin: 0 0 8px; color: var(--text-dim); font-weight: 600; }
.phys-sec > p { margin: 0; font-size: 1.04rem; max-width: 760px; }
.phys-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 10px; }
.phys-card { background: var(--bg-card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.phys-card a { font-weight: 600; }
.phys-card .phys-sym { color: var(--text-mute); margin-left: 6px; }
.phys-card p { margin: 6px 0 0; color: var(--text-dim); font-size: 0.9rem; }
.phys-aliases { color: var(--text-dim); }
.phys-chips { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin: 0; padding: 0; }
.phys-wrap .phys-chips a { display: inline-block; padding: 4px 12px; border-radius: 999px; border: 1px solid var(--line); color: var(--text-dim); font-size: 0.9rem; }
.phys-wrap .phys-chips a:hover { border-color: var(--phase-1); color: var(--text); }

@media (max-width: 640px) {
  .phys-list, .phys-cards { grid-template-columns: 1fr; }
}

/* Lexicon terms linked at their first mention (2026-11-11). */
.phys-wrap a.lex-autolink { color: inherit; text-decoration: underline; text-decoration-color: rgba(53, 232, 224, 0.45); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.phys-wrap a.lex-autolink:hover { color: var(--phase-1); text-decoration-color: var(--phase-1); }