/* Tutorqi. Paper, ink, and a red pen. */

:root {
  --paper: #f5f1e8;
  --paper-2: #ece5d5;
  --paper-3: #e2d9c5;
  --card: #fbf9f4;
  --ink: #1d1c1a;
  --ink-2: #3b3934;
  --muted: #6b665c;
  --rule: #d6cdb9;
  --red: #c2412d;
  --red-dark: #9e3121;
  --green: #23453a;
  --green-2: #2f5c4d;
  --chalk: #e9efe9;
  --highlight: #f3d66b;

  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --hand: "Caveat", "Bradley Hand", cursive;

  --wrap: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 90px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--red); }
::selection { background: var(--highlight); color: var(--ink); }

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0 0 0.5em;
  font-optical-sizing: auto;
}
h1 { font-size: clamp(2.5rem, 6vw, 4.6rem); letter-spacing: -0.028em; }
h2 { font-size: clamp(1.9rem, 3.6vw, 2.9rem); }
h3 { font-size: 1.45rem; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
em { font-style: italic; }
h1 em, h2 em { color: var(--red); font-style: italic; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.narrow { max-width: 760px; }

.label {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.label b { color: var(--red); font-weight: 500; }

.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: var(--ink); color: var(--paper); padding: 8px 12px; z-index: 99; }

/* ---------- header ---------- */
.site-head {
  position: sticky; top: 0; z-index: 40;
  background: rgba(245, 241, 232, 0.94);
  backdrop-filter: saturate(1.2) blur(6px);
  border-bottom: 1px solid var(--rule);
}
.site-head .wrap { display: flex; align-items: center; gap: 28px; height: 68px; }
.brand { display: flex; align-items: baseline; gap: 2px; text-decoration: none; color: var(--ink); }
.brand-word { font-family: var(--serif); font-size: 1.7rem; font-weight: 600; letter-spacing: -0.03em; }
.brand-dot { width: 7px; height: 7px; background: var(--red); border-radius: 50%; display: inline-block; transform: translateY(-2px); }
.nav { display: flex; gap: 4px; margin-left: auto; align-items: center; }
.nav > a, .nav-drop > button {
  font: 500 0.93rem var(--sans); color: var(--ink-2); text-decoration: none;
  padding: 8px 12px; background: none; border: 0; cursor: pointer; border-radius: 2px;
}
.nav > a:hover, .nav-drop > button:hover { color: var(--red); }
.nav-drop { position: relative; }
.nav-drop > button::after { content: ""; display: inline-block; width: 6px; height: 6px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg) translate(-2px, -2px); margin-left: 8px; }
.nav-menu {
  position: absolute; top: calc(100% + 8px); left: -12px; min-width: 300px;
  background: var(--card); border: 1px solid var(--rule); padding: 10px 0;
  box-shadow: 6px 6px 0 var(--paper-3);
  display: none;
}
.nav-drop:hover .nav-menu, .nav-drop:focus-within .nav-menu, .nav-drop.open .nav-menu { display: block; }
.nav-menu a { display: flex; justify-content: space-between; gap: 16px; padding: 7px 18px; text-decoration: none; font-size: 0.93rem; }
.nav-menu a span { font-family: var(--mono); font-size: 0.7rem; color: var(--muted); padding-top: 3px; }
.nav-menu a:hover { background: var(--paper); }
.nav-menu hr { border: 0; border-top: 1px solid var(--rule); margin: 8px 0; }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font: 500 0.98rem var(--sans); text-decoration: none; cursor: pointer;
  padding: 13px 22px; border: 1.5px solid var(--ink); border-radius: 2px;
  background: var(--ink); color: var(--paper);
  transition: transform .12s ease, box-shadow .12s ease;
}
.btn:hover { color: var(--paper); transform: translate(-2px, -2px); box-shadow: 3px 3px 0 var(--red); }
.btn.red { background: var(--red); border-color: var(--red); }
.btn.red:hover { box-shadow: 3px 3px 0 var(--ink); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { color: var(--ink); box-shadow: 3px 3px 0 var(--ink); }
.btn.small { padding: 9px 16px; font-size: 0.9rem; }
.arrow { font-family: var(--mono); }

.menu-toggle { display: none; margin-left: auto; background: none; border: 1.5px solid var(--ink); padding: 7px 12px; font: 500 0.85rem var(--mono); cursor: pointer; border-radius: 2px; color: var(--ink); }

/* ---------- hero ---------- */
.hero { position: relative; padding: clamp(48px, 8vw, 96px) 0 clamp(56px, 8vw, 100px); overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--paper-2) 1px, transparent 1px),
    linear-gradient(90deg, var(--paper-2) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: linear-gradient(115deg, transparent 35%, #000 75%);
          mask-image: linear-gradient(115deg, transparent 35%, #000 75%);
  opacity: .9; pointer-events: none;
}
.hero .wrap { position: relative; display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.hero h1 { margin: 18px 0 24px; }
.hero .lede { font-size: 1.18rem; color: var(--ink-2); max-width: 34em; }
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; margin: 30px 0 22px; }
.hero-note { font-size: 0.9rem; color: var(--muted); }

.circled { position: relative; display: inline-block; white-space: nowrap; }
.circled svg { position: absolute; left: -9%; top: -14%; width: 118%; height: 128%; pointer-events: none; overflow: visible; }
.circled path { fill: none; stroke: var(--red); stroke-width: 2.4; stroke-linecap: round; }
.mark { background: linear-gradient(transparent 58%, var(--highlight) 58%, var(--highlight) 92%, transparent 92%); padding: 0 2px; }

/* worked problem card */
.sheet {
  position: relative; background: var(--card); border: 1px solid var(--rule);
  padding: 26px 26px 22px; transform: rotate(1.2deg);
  box-shadow: 10px 12px 0 var(--paper-3);
  background-image: repeating-linear-gradient(transparent 0 31px, #e6ddcb 31px 32px);
  background-position: 0 14px;
}
.sheet::before { content: ""; position: absolute; top: 0; bottom: 0; left: 44px; width: 1px; background: #e7b3a8; }
.sheet-head { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 0.72rem; color: var(--muted); padding-left: 32px; margin-bottom: 10px; }
.sheet-body { padding-left: 32px; font-family: var(--mono); font-size: 0.86rem; line-height: 32px; color: var(--ink-2); }
.sheet-body .q { font-family: var(--sans); font-size: 0.92rem; line-height: 1.5; margin: 0 0 8px; color: var(--ink); }
.sheet-body .x { text-decoration: line-through; text-decoration-color: var(--red); text-decoration-thickness: 2px; color: var(--muted); }
.pen { font-family: var(--hand); color: var(--red); font-size: 1.45rem; line-height: 1.1; }
.sheet .pen.note1 { position: absolute; right: -6px; top: -46px; transform: rotate(-3deg); text-align: right; }
.sheet .pen.note2 { margin-top: 4px; }
.sheet .tick { color: var(--green-2); font-weight: 600; }
.sheet-tag { position: absolute; left: -16px; bottom: -18px; background: var(--green); color: var(--chalk); font-family: var(--mono); font-size: 0.72rem; padding: 8px 12px; transform: rotate(-2deg); letter-spacing: .04em; }

/* ---------- finder strip ---------- */
.finder { background: var(--ink); color: var(--paper); }
.finder .wrap { display: grid; grid-template-columns: auto 1fr; gap: 28px; align-items: center; padding-top: 26px; padding-bottom: 26px; }
.finder h2 { font-size: 1.5rem; margin: 0; color: var(--paper); }
.finder form { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.finder select { min-width: 210px; }
.finder select, .finder button { height: 48px; }
.finder .btn { border-color: var(--red); background: var(--red); }

select, input, textarea {
  font: 400 1rem var(--sans); color: var(--ink);
  background: var(--card); border: 1.5px solid var(--rule); border-radius: 2px;
  padding: 11px 13px; width: 100%;
}
select { appearance: none; padding-right: 36px; background-image: linear-gradient(45deg, transparent 50%, var(--ink) 50%), linear-gradient(135deg, var(--ink) 50%, transparent 50%); background-position: calc(100% - 18px) 52%, calc(100% - 13px) 52%; background-size: 5px 5px; background-repeat: no-repeat; }
.finder select { width: auto; border-color: #3b3934; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--red); outline-offset: 1px; border-color: var(--ink); }

/* ---------- sections ---------- */
section { padding: clamp(64px, 9vw, 112px) 0; }
.sec-head { display: grid; grid-template-columns: 200px 1fr; gap: 24px; margin-bottom: 44px; }
.sec-head .label { padding-top: 14px; border-top: 1px solid var(--ink); }
.sec-head h2 { margin-bottom: 14px; max-width: 18em; }
.sec-head p { color: var(--ink-2); max-width: 40em; margin: 0; }
.tint { background: var(--paper-2); }
.dark { background: var(--green); color: var(--chalk); }
.dark h2, .dark h3 { color: #fff; }
.dark .label { color: #a9c0b5; }
.dark .sec-head .label { border-color: #a9c0b5; }
.dark .sec-head p { color: #cfdcd5; }

/* catalog */
.catalog { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.catalog h3 { display: flex; justify-content: space-between; align-items: baseline; border-bottom: 2px solid var(--ink); padding-bottom: 10px; margin-bottom: 0; }
.catalog h3 a { text-decoration: none; }
.catalog h3 small { font: 400 0.75rem var(--mono); color: var(--muted); letter-spacing: .05em; }
.cat-row { display: grid; grid-template-columns: 74px 1fr auto; gap: 14px; align-items: baseline; padding: 14px 0; border-bottom: 1px solid var(--rule); text-decoration: none; }
.cat-row:hover { color: var(--ink); background: linear-gradient(90deg, var(--card), transparent); }
.cat-row:hover .cat-name { color: var(--red); }
.cat-code { font: 500 0.72rem var(--mono); color: var(--muted); letter-spacing: .04em; }
.cat-name { font-family: var(--serif); font-size: 1.22rem; }
.cat-meta { font-size: 0.82rem; color: var(--muted); text-align: right; }

/* steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--rule); }
.step { padding: 28px 26px 10px 0; border-right: 1px solid var(--rule); margin-right: 26px; }
.step:last-child { border-right: 0; margin-right: 0; }
.step-n { font-family: var(--serif); font-size: 3.4rem; line-height: 1; color: var(--red); font-style: italic; margin-bottom: 14px; }
.step h3 { font-size: 1.25rem; }
.step p { color: var(--ink-2); font-size: 0.97rem; }
.dark .step { border-color: #3e6a5b; }
.dark .steps { border-color: #3e6a5b; }
.dark .step p { color: #cfdcd5; }
.dark .step-n { color: var(--highlight); }

/* two column prose with margin notes */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 6vw, 80px); align-items: start; }
.pillars { display: grid; gap: 0; }
.pillar { display: grid; grid-template-columns: 44px 1fr; gap: 14px; padding: 22px 0; border-bottom: 1px solid var(--rule); }
.pillar:first-child { border-top: 1px solid var(--rule); }
.pillar .n { font: 500 0.78rem var(--mono); color: var(--red); padding-top: 6px; }
.pillar h3 { font-size: 1.2rem; margin-bottom: 6px; }
.pillar p { margin: 0; color: var(--ink-2); font-size: 0.97rem; }

.quote-block { font-family: var(--serif); font-size: clamp(1.5rem, 2.6vw, 2rem); line-height: 1.3; letter-spacing: -0.01em; }
.quote-block .pen { font-size: 1.6rem; display: block; margin-top: 18px; }

/* FAQ */
.faq { border-top: 2px solid var(--ink); }
.faq details { border-bottom: 1px solid var(--rule); }
.faq summary { list-style: none; cursor: pointer; padding: 20px 40px 20px 0; position: relative; font-family: var(--serif); font-size: 1.25rem; line-height: 1.3; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 16px; font: 300 1.6rem var(--mono); color: var(--red); }
.faq details[open] summary::after { content: "\2212"; }
.faq .a { padding: 0 0 22px; color: var(--ink-2); max-width: 46em; }

/* CTA + form */
.cta { background: var(--red); color: #fff; }
.cta .wrap { display: grid; grid-template-columns: 1fr 1.05fr; gap: clamp(32px, 6vw, 80px); align-items: start; }
.cta h2 { color: #fff; }
.cta h2 em { color: var(--highlight); }
.cta p { color: #fbe3dd; }
.cta .label { color: #f6c9bf; }
.cta .checks { list-style: none; padding: 0; margin: 26px 0 0; }
.cta .checks li { padding: 9px 0 9px 30px; border-top: 1px solid rgba(255,255,255,.25); position: relative; }
.cta .checks li::before { content: ""; position: absolute; left: 4px; top: 16px; width: 12px; height: 7px; border-left: 2px solid var(--highlight); border-bottom: 2px solid var(--highlight); transform: rotate(-45deg); }

.form-card { background: var(--card); color: var(--ink); padding: clamp(22px, 3vw, 34px); border: 1.5px solid var(--ink); box-shadow: 10px 10px 0 var(--ink); }
.form-card h3 { font-size: 1.5rem; margin-bottom: 4px; }
.form-card .sub { color: var(--muted); font-size: 0.92rem; margin-bottom: 20px; }
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 14px; }
.fields .full { grid-column: 1 / -1; }
.field label { display: block; font: 500 0.78rem var(--mono); letter-spacing: .04em; text-transform: uppercase; color: var(--ink-2); margin-bottom: 6px; }
.field label i { font-style: normal; color: var(--muted); text-transform: none; letter-spacing: 0; }
.seg { display: flex; border: 1.5px solid var(--rule); border-radius: 2px; }
.seg label { flex: 1; margin: 0; text-align: center; padding: 10px 6px; cursor: pointer; font: 500 0.9rem var(--sans); text-transform: none; letter-spacing: 0; color: var(--ink-2); }
.seg label + label { border-left: 1.5px solid var(--rule); }
.seg input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.seg input:checked + span { color: var(--red); }
.seg label:has(input:checked) { background: var(--paper); color: var(--red); }
.form-card .btn { width: 100%; justify-content: center; margin-top: 18px; }
.form-msg { margin-top: 14px; font-size: 0.95rem; }
.form-msg.ok { color: var(--green-2); }
.form-msg.err { color: var(--red); }
.hp { position: absolute; left: -5000px; }
.fine { font-size: 0.8rem; color: var(--muted); margin-top: 12px; }

/* ---------- course pages ---------- */
.crumbs { font: 400 0.78rem var(--mono); color: var(--muted); padding-top: 26px; }
.crumbs a { text-decoration: none; }
.crumbs span { margin: 0 8px; color: var(--rule); }

.c-hero { padding: 30px 0 clamp(48px, 7vw, 80px); position: relative; }
.c-hero .wrap { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: clamp(28px, 5vw, 64px); align-items: end; }
.c-hero h1 { font-size: clamp(2.4rem, 5.4vw, 4.1rem); margin: 18px 0 22px; }
.c-hero .lede { font-size: 1.15rem; color: var(--ink-2); max-width: 36em; }
.facts { border: 1.5px solid var(--ink); background: var(--card); }
.facts div { display: grid; grid-template-columns: 112px 1fr; gap: 10px; padding: 12px 16px; border-bottom: 1px solid var(--rule); font-size: 0.93rem; }
.facts div:last-child { border-bottom: 0; }
.facts dt { font: 500 0.7rem var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); padding-top: 3px; }
.facts dd { margin: 0; }
.facts .fact-cta { display: block; padding: 14px 16px; background: var(--ink); color: var(--paper); text-decoration: none; font-weight: 500; }
.facts .fact-cta:hover { background: var(--red); color: #fff; }

.toc { position: sticky; top: 92px; font-size: 0.88rem; }
.toc a { display: block; padding: 6px 0 6px 14px; border-left: 2px solid var(--rule); text-decoration: none; color: var(--muted); }
.toc a:hover { color: var(--ink); border-color: var(--red); }
.toc .label { display: block; margin-bottom: 10px; }
.c-body { display: grid; grid-template-columns: 200px 1fr; gap: clamp(28px, 5vw, 64px); }
.c-body > div > section { padding: 0 0 72px; }
.c-body h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }
.c-body .prose p, .c-body .prose li { color: var(--ink-2); }
.c-body .prose { max-width: 44em; }

.units { width: 100%; border-collapse: collapse; margin: 18px 0 8px; font-size: 0.96rem; }
.units th { text-align: left; font: 500 0.7rem var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--muted); padding: 10px 12px 10px 0; border-bottom: 2px solid var(--ink); }
.units td { padding: 14px 12px 14px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.units td.n { font: 500 0.8rem var(--mono); color: var(--red); width: 46px; padding-top: 17px; }
.units td.w { font: 400 0.85rem var(--mono); white-space: nowrap; text-align: right; width: 110px; padding-top: 17px; }
.units .uname { font-family: var(--serif); font-size: 1.15rem; display: block; margin-bottom: 3px; }
.units .unote { color: var(--muted); font-size: 0.9rem; }
.bar { display: block; height: 4px; background: var(--paper-3); margin-top: 8px; }
.bar i { display: block; height: 100%; background: var(--red); }
.source { font-size: 0.82rem; color: var(--muted); }

.exam { width: 100%; border-collapse: collapse; border: 1.5px solid var(--ink); background: var(--card); font-size: 0.95rem; }
.exam th, .exam td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--rule); vertical-align: top; }
.exam th { background: var(--ink); color: var(--paper); font: 500 0.72rem var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.traps { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 18px; }
.trap { background: var(--card); border: 1px solid var(--rule); border-top: 3px solid var(--red); padding: 20px 22px; }
.trap h3 { font-size: 1.15rem; margin-bottom: 8px; }
.trap p { font-size: 0.95rem; color: var(--ink-2); margin: 0; }

.session-plan { list-style: none; padding: 0; margin: 18px 0 0; counter-reset: s; }
.session-plan li { display: grid; grid-template-columns: 90px 1fr; gap: 16px; padding: 16px 0; border-top: 1px solid var(--rule); }
.session-plan li b { font: 500 0.8rem var(--mono); color: var(--red); padding-top: 3px; }
.session-plan li p { margin: 0; }

.related { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 2px solid var(--ink); }
.related a { display: block; padding: 18px 18px 18px 0; border-bottom: 1px solid var(--rule); text-decoration: none; }
.related a + a { padding-left: 18px; border-left: 1px solid var(--rule); }
.related .cat-code { display: block; margin-bottom: 4px; }
.related .cat-name { font-size: 1.15rem; }

/* hub pages */
.hub-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.hub-card { background: var(--card); border: 1px solid var(--rule); padding: 24px; text-decoration: none; display: flex; flex-direction: column; min-height: 230px; transition: border-color .15s; }
.hub-card:hover { border-color: var(--ink); color: var(--ink); }
.hub-card:hover h3 { color: var(--red); }
.hub-card p { color: var(--ink-2); font-size: 0.95rem; flex: 1; }
.hub-card .more { font: 500 0.8rem var(--mono); color: var(--red); }

/* prose pages */
.page-body { padding: 20px 0 100px; }
.page-body .prose { max-width: 720px; }
.page-body .prose h2 { font-size: 1.8rem; margin-top: 1.6em; }
.page-body .prose p, .page-body .prose li { color: var(--ink-2); }

/* footer */
.site-foot { background: var(--ink); color: #c9c3b6; padding: 72px 0 34px; font-size: 0.92rem; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; }
.site-foot .brand { color: var(--paper); }
.site-foot h4 { font: 500 0.72rem var(--mono); color: #8d877b; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 14px; }
.site-foot ul { list-style: none; margin: 0; padding: 0; }
.site-foot li { margin: 0 0 7px; }
.site-foot a { text-decoration: none; }
.site-foot a:hover { color: var(--highlight); }
.foot-base { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; border-top: 1px solid #3b3934; margin-top: 56px; padding-top: 24px; font-size: 0.82rem; color: #8d877b; }

/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  .hero .wrap, .c-hero .wrap, .cta .wrap, .split { grid-template-columns: 1fr; }
  .sheet { max-width: 520px; margin: 10px auto 0; }
  .steps { grid-template-columns: 1fr 1fr; }
  .step:nth-child(2) { border-right: 0; margin-right: 0; }
  .c-body { grid-template-columns: 1fr; }
  .toc { display: none; }
  .hub-grid { grid-template-columns: 1fr 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  .menu-toggle { display: inline-block; }
  .nav { display: none; position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; align-items: stretch; background: var(--paper); border-bottom: 1px solid var(--ink); padding: 10px var(--gutter) 20px; max-height: calc(100vh - 68px); overflow-y: auto; }
  .nav.open { display: flex; }
  .nav > a, .nav-drop > button { padding: 12px 0; text-align: left; width: 100%; }
  .nav-menu { position: static; display: none; box-shadow: none; border: 0; border-left: 2px solid var(--rule); min-width: 0; background: transparent; padding: 0 0 8px; }
  .nav-drop:hover .nav-menu { display: none; }
  .nav-drop.open .nav-menu { display: block; }
  .nav .btn { margin-top: 10px; justify-content: center; }
  .finder .wrap { grid-template-columns: 1fr; }
  .finder form { justify-content: stretch; }
  .finder select { flex: 1 1 200px; }
  .catalog { grid-template-columns: 1fr; }
  .sec-head { grid-template-columns: 1fr; gap: 14px; }
  .sec-head .label { padding-top: 10px; }
  .traps { grid-template-columns: 1fr; }
  .related { grid-template-columns: 1fr; }
  .related a + a { padding-left: 0; border-left: 0; }
}
@media (max-width: 600px) {
  body { font-size: 16px; }
  .steps { grid-template-columns: 1fr; }
  .step { border-right: 0; margin-right: 0; border-bottom: 1px solid var(--rule); padding-right: 0; }
  .fields { grid-template-columns: 1fr; }
  .hub-grid { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr; }
  .cat-row { grid-template-columns: 62px 1fr; }
  .cat-meta { display: none; }
  .sheet { transform: none; box-shadow: 6px 6px 0 var(--paper-3); }
  .sheet .pen.note1 { display: none; }
  .sheet-tag { left: 8px; }
  .facts div { grid-template-columns: 96px 1fr; }
  .session-plan li { grid-template-columns: 1fr; gap: 4px; }
  .units td.w { width: 74px; }
  .form-card { box-shadow: 6px 6px 0 var(--ink); }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* ---------- between sessions loop + report mock ---------- */
.loop { display: grid; gap: 0; border-top: 2px solid var(--ink); }
.loop-step { display: grid; grid-template-columns: 52px 1fr; column-gap: 14px; padding: 18px 0; border-bottom: 1px solid var(--rule); }
.loop-step .n { font: 500 0.8rem var(--mono); color: var(--red); padding-top: 5px; grid-row: span 2; }
.loop-step h3 { font-size: 1.2rem; margin: 0 0 4px; }
.loop-step p { margin: 0; color: var(--ink-2); font-size: 0.97rem; }
.loop-note { margin-top: 22px; color: var(--ink-2); font-size: 0.97rem; }
.report { position: relative; margin: 0; background: #fff; border: 1px solid var(--rule); padding: 26px 28px 22px; box-shadow: 10px 12px 0 var(--paper-3); transform: rotate(-0.8deg); font-size: 0.88rem; color: var(--ink-2); }
.report-top { display: flex; justify-content: space-between; font: 400 0.7rem var(--mono); color: var(--muted); border-bottom: 1px solid var(--rule); padding-bottom: 10px; margin-bottom: 14px; }
.report-title { font-family: var(--serif); font-size: 1.25rem; color: var(--ink); margin-bottom: 12px; }
.report-table { width: 100%; border-collapse: collapse; margin-bottom: 16px; }
.report-table th { text-align: left; font: 500 0.66rem var(--mono); text-transform: uppercase; letter-spacing: .05em; color: var(--muted); border-bottom: 1.5px solid var(--ink); padding: 6px 6px 6px 0; }
.report-table td { padding: 7px 6px 7px 0; border-bottom: 1px solid var(--paper-2); }
.report-table td + td, .report-table th + th { text-align: right; font-family: var(--mono); white-space: nowrap; }
.report-h { font: 600 0.72rem var(--sans); text-transform: uppercase; letter-spacing: .06em; color: var(--green); margin: 14px 0 6px; }
.report p { margin: 0 0 8px; line-height: 1.5; }
.report-fix { border-left: 3px solid var(--red); padding: 4px 0 2px 12px; }
.report-fix b { color: var(--ink); font-weight: 600; }
.report-pen { font-size: 1.35rem; margin-top: 10px; transform: rotate(-2deg); }
.report figcaption { font: 400 0.68rem var(--mono); color: var(--muted); margin-top: 12px; }
@media (max-width: 600px) { .report { transform: none; box-shadow: 6px 6px 0 var(--paper-3); padding: 20px 18px; } }