/* ---------- section chrome ---------- */
section.block {
  padding: 3rem 4rem;
  border-bottom: 1px solid var(--line);
}

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.sec-head .path {
  font: 500 0.72rem var(--mono);
  color: var(--dim);
  letter-spacing: 0.06em;
  flex: none;
}

.sec-head .path b { color: var(--c); font-weight: 500; }

.sec-head h2 {
  font: 700 1.5rem var(--disp);
  letter-spacing: -0.02em;
  color: var(--ink);
}

.sec-head .rule { flex: 1; height: 1px; background: var(--line); align-self: center; }

.prose { max-width: 72ch; color: var(--muted); }
.prose b, .prose strong { color: var(--ink); }
.prose code {
  font: 400 0.85em var(--mono);
  background: var(--panel-2);
  border: 1px solid var(--line);
  padding: 0.08em 0.35em;
  color: var(--ink);
}
.prose p + p { margin-top: 1rem; }
.prose ul, .prose ol { margin: 0.6rem 0 0.6rem 1.3rem; }
.prose li { margin: 0.3rem 0; }

/* corner ticks */
.ticked { position: relative; }
.ticked .tick { position: absolute; width: 9px; height: 9px; pointer-events: none; }
.tick.tl { top: -5px; left: -5px; border-left: 1px solid var(--dim); border-top: 1px solid var(--dim); }
.tick.br { bottom: -5px; right: -5px; border-right: 1px solid var(--dim); border-bottom: 1px solid var(--dim); }

/* ---------- home hero ---------- */
.hero {
  padding: 4.5rem 4rem 3.5rem;
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.hero .kicker {
  font: 500 0.72rem var(--mono);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--l1);
  margin-bottom: 1.2rem;
}

.hero h1 {
  font: 700 clamp(2.4rem, 4.6vw, 4.2rem)/1.02 var(--disp);
  letter-spacing: -0.025em;
  max-width: 13ch;
}

.hero h1 em { font-style: normal; color: var(--l1); }

.hero p.sub {
  max-width: 52ch;
  color: var(--muted);
  margin-top: 1.4rem;
  font-size: 1.05rem;
}

.halftone {
  position: absolute;
  right: 0;
  top: 0;
  width: 46%;
  height: 78%;
  pointer-events: none;
  opacity: 0.38;
  background: url('../images/hero-graph.png') 78% 65%/170% no-repeat;
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 70%), linear-gradient(to top, transparent 0%, black 45%);
  -webkit-mask-composite: source-in;
  mask-image: linear-gradient(to right, transparent 0%, black 70%), linear-gradient(to top, transparent 0%, black 45%);
  mask-composite: intersect;
}

.term {
  margin-top: 2.6rem;
  max-width: 760px;
  border: 1px solid var(--line);
  background: #08080a;
  box-shadow: 0 0 0 1px #000, 8px 8px 0 0 rgba(80, 255, 255, 0.06);
}

.term-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.term-bar i { width: 9px; height: 9px; border: 1px solid var(--dim); display: block; }
.term-bar span { margin-left: 0.4rem; font: 400 0.7rem var(--mono); color: var(--dim); }

.term-body {
  padding: 1.1rem 1.2rem 1.3rem;
  font: 400 0.82rem/1.85 var(--mono);
  min-height: 210px;
}

.term-body .ln { white-space: pre-wrap; word-break: break-word; }
.term-body .p { color: var(--l1); }
.term-body .ok { color: #5dffa2; }
.term-body .k { color: var(--l4); }
.term-body .c { color: var(--dim); }
.cursor {
  display: inline-block;
  width: 8px;
  height: 1.05em;
  background: var(--l1);
  vertical-align: text-bottom;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-cta {
  margin-top: 2.2rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.btn {
  display: inline-block;
  font: 500 0.85rem var(--mono);
  padding: 0.8rem 1.5rem;
  border: 1px solid var(--l1);
  color: #041414;
  background: var(--l1);
  letter-spacing: 0.02em;
}
.btn:hover { background: transparent; color: var(--l1); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--l4); color: var(--l4); }

.hero-stats {
  margin-top: 2.6rem;
  display: flex;
  gap: 0;
  border: 1px solid var(--line);
  width: max-content;
  max-width: 100%;
  flex-wrap: wrap;
}
.hero-stats div {
  padding: 0.8rem 1.6rem;
  border-right: 1px solid var(--line);
  font: 400 0.72rem var(--mono);
  color: var(--dim);
}
.hero-stats div:last-child { border-right: 0; }
.hero-stats b {
  display: block;
  font: 700 1.25rem var(--disp);
  color: var(--ink);
  letter-spacing: -0.01em;
}

/* ---------- pipeline / level cards ---------- */
.pipeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--line);
}

.lc {
  --lc: var(--l1);
  position: relative;
  padding: 1.8rem 1.5rem 1.5rem;
  border-right: 1px solid var(--line);
  background: var(--panel);
  transition: background 0.18s ease;
}
.lc:last-child { border-right: 0; }
.lc:hover { background: var(--panel-2); }
.lc::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--lc);
}
.lc .num {
  font: 700 2.6rem/1 var(--disp);
  color: var(--lc);
  letter-spacing: -0.03em;
  position: relative;
  z-index: 1;
}
.lc .emblem {
  position: absolute;
  top: 1.2rem;
  right: 1rem;
  width: 60px;
  height: 60px;
  opacity: 0.7;
  background-image: url('../images/emblems.png');
  background-size: 265% 265%;
  pointer-events: none;
}
.lc .emblem.e1 { background-position: 7% 5%; }
.lc .emblem.e2 { background-position: 93% 5%; }
.lc .emblem.e3 { background-position: 7% 66%; }
.lc .emblem.e4 { background-position: 93% 66%; }
.lc .lname { font: 700 1.05rem var(--disp); margin-top: 0.9rem; letter-spacing: -0.01em; }
.lc .lsub {
  font: 500 0.68rem var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-top: 0.3rem;
}
.lc p { font-size: 0.84rem; color: var(--muted); margin-top: 0.9rem; }
.lc .mods { list-style: none; margin-top: 1.2rem; border-top: 1px solid var(--line); padding: 0; }
.lc .mods li { margin: 0; }
.lc .mods a {
  display: flex;
  gap: 0.55rem;
  align-items: baseline;
  padding: 0.5rem 0.1rem;
  font-size: 0.8rem;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}
.lc .mods a:hover { color: var(--ink); }
.lc .mods a:hover .mi { background: var(--lc); color: #050506; }
.lc .mi {
  flex: none;
  font: 500 0.66rem/1.5 var(--mono);
  color: var(--lc);
  border: 1px solid var(--lc);
  padding: 0 0.3rem;
}
.lc .go {
  display: inline-block;
  margin-top: 1.2rem;
  font: 500 0.74rem var(--mono);
  color: var(--lc);
  letter-spacing: 0.04em;
}
.lc .go:hover { text-decoration: underline; }

/* ---------- how it works : log lines ---------- */
.how {
  border: 1px solid var(--line);
  background: #08080a;
  font: 400 0.84rem/1.8 var(--mono);
}
.how .row { display: grid; grid-template-columns: 100px 1fr; border-bottom: 1px solid var(--line); }
.how .row:last-child { border-bottom: 0; }
.how .st {
  padding: 0.85rem 1.1rem;
  color: var(--l1);
  border-right: 1px solid var(--line);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}
.how .tx { padding: 0.85rem 1.2rem; color: var(--muted); }
.how .tx b { color: var(--ink); font-weight: 500; }

/* ---------- module header ---------- */
.mod-head {
  padding: 3rem 4rem 2.4rem;
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.crumbs { font: 500 0.72rem var(--mono); color: var(--dim); letter-spacing: 0.05em; }
.crumbs a { color: var(--dim); }
.crumbs a:hover { color: var(--c); }
.crumbs .sep { padding: 0 0.45rem; opacity: 0.6; }
.crumbs .here { color: var(--c); }
.mod-title { display: flex; gap: 1.6rem; align-items: flex-start; margin-top: 1.6rem; }
.mod-title .bignum {
  font: 700 4.2rem/0.9 var(--disp);
  color: var(--c);
  letter-spacing: -0.04em;
  border-right: 1px solid var(--line);
  padding-right: 1.6rem;
  flex: none;
}
.mod-title h1 { font: 700 clamp(1.7rem, 3vw, 2.5rem)/1.1 var(--disp); letter-spacing: -0.02em; max-width: 22ch; }
.mod-title .lede { color: var(--muted); margin-top: 0.8rem; max-width: 60ch; }
.chips { margin-top: 1.6rem; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.chip {
  font: 500 0.68rem var(--mono);
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 0.25rem 0.6rem;
  background: var(--panel);
}
.chip.hot { border-color: var(--c); color: var(--c); }

.page-title { font: 700 clamp(1.7rem, 3vw, 2.4rem) var(--disp); letter-spacing: -0.02em; }
.lede { color: var(--muted); font-size: 1.05rem; }

/* ---------- video ---------- */
.video { max-width: 760px; border: 1px solid var(--line); position: relative; background: #0a0a0c; }
.video-wrapper { position: relative; aspect-ratio: 16 / 9; }
.video-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  cursor: pointer;
  background-size: cover;
  background-position: center;
}
.video-placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, var(--c) 1.4px, transparent 1.5px);
  background-size: 12px 12px;
  opacity: 0.35;
  -webkit-mask-image: linear-gradient(120deg, black 30%, transparent 75%);
  mask-image: linear-gradient(120deg, black 30%, transparent 75%);
}
.video-wrapper iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.play-button {
  position: relative;
  font: 500 0.8rem var(--mono);
  color: #041414;
  background: var(--c);
  border: 0;
  padding: 0.85rem 1.6rem;
  cursor: pointer;
  letter-spacing: 0.03em;
}
.video-placeholder:hover .play-button { background: var(--ink); }
.vmeta {
  display: flex;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  border-top: 1px solid var(--line);
  font: 400 0.7rem var(--mono);
  color: var(--dim);
}

/* ---------- code block ---------- */
.code { border: 1px solid var(--line); background: #08080a; max-width: 860px; margin: 0; }
.code-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.55rem 1rem;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.code-header .lang {
  font: 500 0.62rem var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c);
  border: 1px solid var(--c);
  padding: 0.1rem 0.45rem;
}
.code-header .fname { font: 400 0.74rem var(--mono); color: var(--muted); }
.copy-btn {
  margin-left: auto;
  font: 500 0.7rem var(--mono);
  background: none;
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 0.3rem 0.8rem;
  cursor: pointer;
}
.copy-btn:hover { border-color: var(--c); color: var(--c); }
.code pre { padding: 1.1rem 1.2rem; overflow-x: auto; font: 400 0.8rem/1.75 var(--mono); color: #c9cad1; margin: 0; }
.code pre code { font: inherit; color: inherit; }

/* ---------- lab ---------- */
.lab { border: 1px solid var(--line); border-left: 3px solid var(--c); background: var(--panel); max-width: 860px; }
.lab-head { display: flex; align-items: center; gap: 1rem; padding: 1rem 1.4rem; border-bottom: 1px solid var(--line); }
.lab-head h3 { font: 700 1.05rem var(--disp); color: var(--ink); }
.lab-head .badge {
  font: 500 0.62rem var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c);
  border: 1px solid var(--c);
  padding: 0.15rem 0.5rem;
}
.lab-prog { margin-left: auto; display: flex; align-items: center; gap: 0.7rem; font: 500 0.7rem var(--mono); color: var(--muted); }
.meter { width: 120px; height: 6px; background: var(--panel-2); border: 1px solid var(--line); }
.meter i { display: block; height: 100%; width: 0; background: var(--c); transition: width 0.2s ease; }
.lab-body { padding: 1.4rem; color: var(--muted); font-size: 0.92rem; }
.lab-body h4 {
  font: 500 0.78rem var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 1.4rem 0 0.6rem;
}
.lab-body ol { margin: 0.8rem 0 1.4rem 1.2rem; }
.lab-body li + li { margin-top: 0.4rem; }
.lab-body code {
  font: 400 0.85em var(--mono);
  background: var(--panel-2);
  border: 1px solid var(--line);
  padding: 0.08em 0.35em;
  color: var(--ink);
}
/* long inline code tokens must wrap rather than widen the page on small screens */
code:not(pre code) { overflow-wrap: anywhere; }
.crit { list-style: none; border-top: 1px solid var(--line); margin: 1rem 0 0; padding: 0; }
.crit li {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  padding: 0.65rem 0.2rem;
  border-bottom: 1px solid var(--line);
  font: 400 0.85rem var(--mono);
  margin: 0;
}
.crit input {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border: 1px solid var(--dim);
  background: transparent;
  cursor: pointer;
  flex: none;
  display: grid;
  place-items: center;
}
.crit input:checked { border-color: #5dffa2; }
.crit input:checked::after { content: "\2713"; color: #5dffa2; font: 700 0.7rem var(--mono); }
.crit label { cursor: pointer; color: var(--muted); }
.crit li.done label { color: #5dffa2; }

/* nested disclosure panels (expected / hints / solution) */
.lab-body details { border: 1px solid var(--line); background: var(--panel-2); margin: 0.75rem 0 0; }
.lab-body summary { padding: 0.7rem 1rem; cursor: pointer; color: var(--c); font: 500 0.78rem var(--mono); list-style: none; }
.lab-body summary::-webkit-details-marker { display: none; }
.lab-body details > div { padding: 0.4rem 1rem 1rem; border-top: 1px solid var(--line); }

/* ---------- common mistakes ---------- */
.mist { max-width: 860px; border: 1px solid var(--line); background: #08080a; font: 400 0.84rem/1.8 var(--mono); }
.mist .row { display: grid; grid-template-columns: 90px 1fr; border-bottom: 1px solid var(--line); }
.mist .row:last-child { border-bottom: 0; }
.mist .st {
  padding: 0.8rem 1rem;
  color: #ff7a90;
  border-right: 1px solid var(--line);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}
.mist .tx { padding: 0.8rem 1.2rem; color: var(--muted); }
.mist .tx code { color: var(--ink); }

/* ---------- prev / next ---------- */
.pn { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; padding: 2.4rem 4rem; }
.pn a { border: 1px solid var(--line); padding: 1.1rem 1.4rem; background: var(--panel); }
.pn a:hover { border-color: var(--c); }
.pn .dir { font: 500 0.66rem var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim); }
.pn .t { display: block; font: 700 0.95rem var(--disp); margin-top: 0.35rem; color: var(--ink); }
.pn a.next { text-align: right; }
.pn > span { display: none; }

/* ---------- generic content card (level index / home extras) ---------- */
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 1.5rem;
  margin: 0;
}
.card h2 { font: 700 1.15rem var(--disp); color: var(--ink); margin-bottom: 0.8rem; }
.card p { color: var(--muted); }
.card ol, .card ul { margin: 0.6rem 0 0 1.3rem; color: var(--muted); }
.card li { margin: 0.35rem 0; }

.module-list { list-style: none; margin: 0; padding: 0; }
.module-list li { padding: 0.55rem 0.1rem; border-bottom: 1px solid var(--line); margin: 0; display: flex; gap: 0.6rem; align-items: baseline; }
.module-list li:last-child { border-bottom: none; }
.module-list .mi {
  flex: none;
  font: 500 0.66rem/1.5 var(--mono);
  color: var(--c);
  border: 1px solid var(--c);
  padding: 0 0.3rem;
}
.module-list a { color: var(--ink); }
.module-list a:hover { color: var(--c); }
.module-list .focus { color: var(--muted); font-size: 0.85rem; }

/* ---------- tables ---------- */
.table-wrapper { overflow-x: auto; border: 1px solid var(--line); margin: 0; }
.table-wrapper table { margin: 0; min-width: 640px; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  font: 400 0.85rem var(--mono);
}
.data-table caption { text-align: left; }
.data-table th, .data-table td {
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  padding: 0.7rem 0.9rem;
  text-align: left;
  vertical-align: top;
}
.data-table th:last-child, .data-table td:last-child { border-right: 0; }
.data-table thead th {
  background: var(--panel);
  color: var(--c);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.72rem;
}
.data-table tbody tr:nth-child(even) { background: rgba(255, 255, 255, 0.015); }
.data-table tbody tr:hover { background: var(--panel-2); }
.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table a { color: var(--ink); }
.data-table a:hover { color: var(--c); }

/* aliases so both page types share table styling */
.syllabus-table, .agents-table { width: 100%; border-collapse: collapse; }

footer {
  padding: 2rem 4rem;
  font: 400 0.74rem var(--mono);
  color: var(--dim);
  border-top: 1px solid var(--line);
}

@media (max-width: 1100px) {
  .pipeline { grid-template-columns: repeat(2, 1fr); }
  .lc:nth-child(2) { border-right: 0; }
  .lc:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}

@media (max-width: 900px) {
  .hero, section.block, .mod-head { padding: 2.5rem 1.4rem; }
  .pn { padding: 2rem 1.4rem; grid-template-columns: 1fr; }
  footer { padding: 2rem 1.4rem; }
  .mod-title { flex-direction: column; gap: 0.8rem; }
  .mod-title .bignum { border-right: 0; padding-right: 0; }
  .sec-head { flex-wrap: wrap; gap: 0.5rem 1rem; }
}

@media (max-width: 640px) {
  .pipeline { grid-template-columns: 1fr; }
  .lc { border-right: 0; border-bottom: 1px solid var(--line); }
  .lc:last-child { border-bottom: 0; }
}