:root {
  --bg: #0f1115;
  --card: #171a21;
  --text: #e7e9ee;
  --muted: #9aa3b2;
  --soft: #c7ccd6;
  --accent: #5b8cff;
  --border: #262b36;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.container { max-width: 820px; margin: 0 auto; padding: 48px 20px 80px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 2rem; margin: 0 0 .25em; }
.lede { color: var(--muted); font-size: 1.1rem; margin: 0 0 2.5em; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; color: var(--accent); font-weight: 600; margin: 0 0 .6em; }
.cards { display: grid; gap: 16px; }
.card {
  display: block; background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 20px 22px; transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.card h2 { margin: 0 0 .3em; font-size: 1.15rem; color: var(--text); }
.card p { margin: 0; color: var(--muted); }
.section { margin: 2.4em 0; }
.section h2 { font-size: 1.25rem; margin: 0 0 .4em; }
.section p { margin: .5em 0; color: var(--soft); }
.section ul { color: var(--soft); }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 1em; }
.btn { display: inline-block; background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 8px; font-weight: 600; }
.btn.secondary { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn:hover { text-decoration: none; opacity: .92; }
.back { display: inline-block; margin-bottom: 1.5em; color: var(--muted); font-size: .9rem; }
footer { margin-top: 3em; padding-top: 1.5em; border-top: 1px solid var(--border); color: var(--muted); font-size: .85rem; }
code { background: #11141a; border: 1px solid var(--border); border-radius: 5px; padding: .1em .4em; font-size: .9em; }

/* Mapping tables */
table { width: 100%; border-collapse: collapse; margin: 1em 0 1.5em; font-size: .92rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; }
tbody tr:hover { background: #1b1f28; }
.muted-cell { color: var(--muted); }

/* Cascade chains */
.chain { display: flex; flex-wrap: wrap; align-items: center; gap: .5em; margin: .3em 0 1.1em; }
.chain .out { font-weight: 700; color: var(--text); min-width: 9.5em; }
.pill { background: #11141a; border: 1px solid var(--border); border-radius: 6px; padding: .15em .55em; font-size: .85rem; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: var(--soft); }
.arrow { color: var(--accent); font-weight: 700; }
.note { background: #141821; border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 8px; padding: .9em 1.1em; color: var(--soft); font-size: .92rem; margin: 1.4em 0; }
.note p { margin: .4em 0; }

/* ---- Mapping diagram ---- */
.legend { display: flex; gap: 18px; flex-wrap: wrap; margin: .4em 0 1.4em; font-size: .85rem; color: var(--muted); }
.legend span { display: inline-flex; align-items: center; gap: .45em; }
.swatch { width: 13px; height: 13px; border-radius: 3px; border: 1px solid; display: inline-block; }
.sw-page { background: #16335f; border-color: #3b82f6; }
.sw-brand { background: #3a2c12; border-color: #d29a2e; }
.sw-derived { background: #1b1f28; border-color: var(--border); }

.pill.src-page { border-color: #3b82f6; color: #9cc2ff; }
.pill.src-brand { border-color: #d29a2e; color: #f0c879; }
.pill.src-derived { border-color: var(--border); color: var(--muted); }

/* Cascade flow rows: sources -> output */
.flow { display: flex; align-items: center; flex-wrap: wrap; gap: .5em; padding: .8em 0; border-bottom: 1px solid var(--border); }
.flow .arrow { color: var(--muted); }
.flow .becomes { color: var(--accent); font-weight: 700; margin: 0 .1em; }
.out-tag { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-weight: 700; color: #7ee0a6; }

/* Two-column side by side */
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 1.2em 0; }
@media (max-width: 680px) { .cols { grid-template-columns: 1fr; } }
.panel { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px; }
.panel h3 { margin: 0 0 .7em; font-size: 1rem; }
.kv { display: flex; justify-content: space-between; gap: 1em; padding: .35em 0; border-bottom: 1px dashed var(--border); font-size: .86rem; }
.kv:last-child { border-bottom: 0; }
.kv .k { color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.v-page { color: #9cc2ff; }
.v-brand { color: #f0c879; }

pre { background: #0c0e13; border: 1px solid var(--border); border-radius: 10px; padding: 14px; overflow: auto; font-size: .8rem; line-height: 1.5; color: var(--soft); }
pre.has-article { border-left: 3px solid #7ee0a6; }
pre .hl { color: #7ee0a6; }

/* ---- Breadcrumb builder graphic ---- */
.urlstrip { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 1.05rem; background: #0c0e13; border: 1px solid var(--border); border-radius: 10px; padding: 16px; margin: 1em 0; word-break: break-all; }
.u-scheme { color: var(--muted); }
.u-domain { color: #f0c879; background: #3a2c12; border-radius: 4px; padding: .08em .3em; }
.u-seg { color: #9cc2ff; background: #16335f; border-radius: 4px; padding: .08em .3em; }

.bc-lanes { display: flex; gap: 16px; margin: 1.4em 0; flex-wrap: wrap; }
.lane { flex: 1 1 240px; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.seg { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; border-radius: 8px; padding: .5em .7em; width: 100%; text-align: center; }
.seg.dom { color: #f0c879; background: #3a2c12; border: 1px solid #d29a2e; }
.seg.path { color: #9cc2ff; background: #16335f; border: 1px solid #3b82f6; }
.seg .lbl { display: block; color: var(--muted); font-size: .7rem; text-transform: uppercase; letter-spacing: .05em; margin-top: .5em; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
.down { color: var(--accent); font-size: 1.4rem; line-height: 1; }
.crumb { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: .9em 1em; width: 100%; }
.crumb .cn { font-weight: 700; font-size: 1.05rem; }
.crumb .cd { color: var(--muted); font-size: .8rem; margin-top: .35em; }
.crumb .cd code { font-size: .92em; }

.k-type { color: #c792ea; }
.k-list { color: #82aaff; }
.k-pos { color: #7ee0a6; }
.k-name { color: #f0c879; }
.k-item { color: #5fd3c3; }
.k-ctx { color: var(--muted); }
.anno { display: grid; grid-template-columns: auto 1fr; gap: .5em 1.1em; margin: 1.2em 0; font-size: .9rem; align-items: baseline; }
.anno .akey { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-weight: 700; white-space: nowrap; }
.anno .adesc { color: var(--soft); }