:root {
  --ink: #172522;
  --ink-soft: #4f5d58;
  --cream: #f3efe5;
  --paper: #fbf8f1;
  --white: #fffdf8;
  --teal: #1f5f55;
  --teal-dark: #17483f;
  --coral: #e76546;
  --mustard: #d8a931;
  --lavender: #8e83b3;
  --line: rgba(23, 37, 34, 0.15);
  --shadow: 0 24px 80px rgba(32, 47, 42, 0.12);
  --serif: "Newsreader", Georgia, serif;
  --sans: "DM Sans", Arial, sans-serif;
  --mono: "DM Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--cream);
  font-family: var(--sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; }
a { color: inherit; }
textarea { resize: vertical; }
[hidden] { display: none !important; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  transform: translateY(-150%);
  padding: 10px 16px;
  background: var(--ink);
  color: white;
  border-radius: 6px;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  width: min(1240px, calc(100% - 48px));
  height: 88px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 20;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand em { color: var(--coral); font-family: var(--serif); font-weight: 500; }
.brand-mark {
  width: 32px;
  height: 32px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: end;
  gap: 2px;
  transform: rotate(-8deg);
}
.brand-mark span { display: block; background: var(--teal); border-radius: 5px 5px 2px 2px; }
.brand-mark span:nth-child(1) { height: 17px; }
.brand-mark span:nth-child(2) { height: 26px; background: var(--coral); }
.brand-mark span:nth-child(3) { height: 21px; }
.top-nav { display: flex; align-items: center; gap: 30px; font-size: 14px; font-weight: 600; }
.top-nav a { text-decoration: none; }
.text-button { border: 0; background: transparent; padding: 0; cursor: pointer; font-weight: 600; }
.top-nav a:hover, .text-button:hover { color: var(--coral); }

.view { min-height: calc(100vh - 88px); }
.hero-shell {
  width: min(1240px, calc(100% - 48px));
  min-height: 675px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  align-items: center;
  gap: 60px;
  padding: 65px 0 90px;
}
.eyebrow, .section-kicker, .step-eyebrow, .mini-label {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-size: 11px;
  font-weight: 500;
}
.eyebrow { display: flex; align-items: center; gap: 12px; color: var(--ink-soft); }
.eyebrow span { color: var(--teal); }
.eyebrow span::after { content: "·"; margin-left: 12px; color: var(--coral); }
.hero-copy h1 {
  margin: 24px 0 22px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(52px, 6.5vw, 88px);
  line-height: 0.93;
  letter-spacing: -0.055em;
}
.hero-copy h1 i { font-weight: 500; color: var(--teal); }
.hero-intro {
  max-width: 560px;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.7;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button {
  min-height: 50px;
  padding: 0 22px;
  border-radius: 7px;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  cursor: pointer;
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
  transition: transform 160ms ease, background 160ms ease, color 160ms ease;
}
.button:hover { transform: translateY(-2px); }
.button:focus-visible, button:focus-visible, a:focus-visible, textarea:focus-visible, input:focus-visible {
  outline: 3px solid rgba(231, 101, 70, 0.35);
  outline-offset: 3px;
}
.button-primary { background: var(--teal); color: white; }
.button-primary:hover { background: var(--teal-dark); }
.button-ghost { border-color: var(--line); background: rgba(255,255,255,0.26); }
.button-light { background: var(--paper); color: var(--teal-dark); }
.trust-line { display: flex; flex-wrap: wrap; gap: 23px; margin-top: 28px; color: var(--ink-soft); font-size: 12px; }
.trust-line span { display: flex; align-items: center; gap: 7px; }
.trust-line span::before { content: "✓"; color: var(--teal); font-weight: 700; }

.hero-visual { min-height: 530px; position: relative; display: grid; place-items: center; }
.problem-preview {
  position: relative;
  z-index: 3;
  width: min(430px, 86%);
  min-height: 485px;
  padding: 28px 32px 32px;
  background: var(--paper);
  border: 1px solid rgba(23, 37, 34, 0.14);
  box-shadow: var(--shadow);
  transform: rotate(2.2deg);
}
.problem-preview::before {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(23, 37, 34, 0.08);
  pointer-events: none;
}
.preview-topline { display: flex; justify-content: space-between; align-items: center; font-family: var(--mono); font-size: 10px; }
.lesson-chip { padding: 6px 9px; border: 1px solid var(--line); text-transform: uppercase; letter-spacing: .08em; }
.preview-number { color: var(--coral); }
.garden-sketch {
  width: 78%;
  aspect-ratio: 1.5;
  margin: 55px auto 38px;
  padding: 19px;
  border: 2px solid var(--ink);
  position: relative;
  background: repeating-linear-gradient(45deg, transparent, transparent 7px, rgba(231,101,70,.18) 7px, rgba(231,101,70,.18) 9px);
}
.garden-inner { width: 100%; height: 100%; display: grid; place-items: center; background: #a9c0a5; border: 1px solid var(--teal); }
.garden-inner span { font-family: var(--serif); font-style: italic; font-size: 18px; color: var(--teal-dark); }
.dimension { position: absolute; font-family: var(--mono); font-size: 10px; }
.dimension-top { top: -25px; left: 47%; }
.dimension-side { left: -35px; top: 45%; transform: rotate(-90deg); }
.path-label { position: absolute; right: -11px; bottom: -27px; font-size: 10px; color: var(--coral); transform: rotate(-3deg); }
.expression-sketch { width: 88%; margin: 55px auto 38px; }
.mini-expression { margin-bottom: 28px; text-align: center; font-family: var(--serif); font-size: 31px; letter-spacing: .02em; }
.mini-expression span { display: inline-grid; width: 37px; height: 37px; place-items: center; border: 1px solid var(--coral); background: #f5e2da; }
.mini-strip-row { height: 38px; display: flex; border: 1.5px solid var(--ink); }
.mini-strip-row + .mini-strip-row { margin-top: 11px; }
.mini-strip-row b, .mini-strip-row i { display: grid; place-items: center; font-family: var(--mono); font-size: 10px; font-style: normal; font-weight: 500; }
.mini-strip-row b { flex: 0 0 var(--part); background: #b6c9b2; }
.mini-strip-row i { flex: 1; background: #efc5b5; border-left: 1px solid var(--ink); }
.mini-strip-row.second b { background: #e4e0d5; }
.mini-strip-row.second i { background: #cfc8e2; }
.expression-sketch small { display: block; margin-top: 10px; text-align: right; color: var(--teal); font-family: var(--mono); font-size: 9px; text-transform: uppercase; letter-spacing: .08em; }
.problem-preview > p { margin: 0; font-family: var(--serif); font-size: 22px; line-height: 1.35; }
.pencil-line { display: grid; gap: 8px; margin-top: 25px; }
.pencil-line span { display: block; border-bottom: 1px solid rgba(23,37,34,.18); }
.hand-note { margin-top: 18px !important; color: var(--coral); font-family: var(--serif) !important; font-style: italic; font-size: 15px !important; transform: rotate(-2deg); }
.orbit { position: absolute; border: 1px solid rgba(31,95,85,.24); border-radius: 50%; }
.orbit-one { width: 500px; height: 500px; }
.orbit-two { width: 355px; height: 355px; border-color: rgba(231,101,70,.21); transform: translate(45px, -25px); }
.number-scribble { position: absolute; z-index: 4; font-family: var(--serif); font-style: italic; color: var(--coral); }
.scribble-one { left: 2%; top: 21%; transform: rotate(-9deg); font-size: 17px; }
.scribble-two { right: 5%; bottom: 17%; font-size: 44px; color: var(--teal); transform: rotate(11deg); }

.method-section { background: var(--teal-dark); color: #f7f3e8; padding: 100px max(24px, calc((100vw - 1240px)/2)); }
.section-kicker { color: #a9c9bf; margin-bottom: 20px; }
.method-heading { display: grid; grid-template-columns: 1.2fr .8fr; gap: 60px; align-items: end; }
.method-heading h2, .grades-heading h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(42px, 5vw, 68px);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -.04em;
}
.method-heading p { max-width: 460px; color: #bad0c8; line-height: 1.8; }
.method-heading em { color: #ffbca9; }
.method-steps { list-style: none; padding: 0; margin: 78px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); }
.method-steps li { min-height: 275px; padding: 0 28px; border-left: 1px solid rgba(255,255,255,.16); position: relative; }
.method-steps li:first-child { padding-left: 0; border-left: 0; }
.method-index { font-family: var(--mono); color: #8eaea5; font-size: 10px; }
.method-symbol { margin: 35px 0 28px; width: 50px; height: 50px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.28); border-radius: 50%; color: #ffc6b5; font-family: var(--serif); font-size: 25px; }
.method-steps h3 { margin: 0 0 12px; font-family: var(--serif); font-weight: 500; font-size: 25px; }
.method-steps p { margin: 0; color: #a9c0b9; font-size: 14px; line-height: 1.7; }

.grades-section { width: min(1240px, calc(100% - 48px)); margin: 0 auto; padding: 110px 0 120px; }
.grades-heading { display: grid; grid-template-columns: 1.35fr .65fr; gap: 50px; align-items: end; margin-bottom: 54px; }
.grades-heading .section-kicker { color: var(--coral); }
.grades-heading > p { color: var(--ink-soft); line-height: 1.8; }
.grade-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.grade-card { min-height: 375px; padding: 34px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); display: flex; flex-direction: column; position: relative; overflow: hidden; }
.grade-card::after { content: ""; width: 220px; height: 220px; border: 1px solid var(--line); border-radius: 50%; position: absolute; right: -85px; top: -85px; }
.grade-card:hover::after { transform: scale(1.08); transition: transform 300ms ease; }
.grade-seven { background: #e6b643; }
.grade-eight { background: #d9e3da; }
.grade-nine { background: #d6d0e5; }
.grade-ten { background: #efc5b5; }
.grade-card-top { display: flex; align-items: flex-start; gap: 12px; position: relative; z-index: 1; }
.grade-label { writing-mode: vertical-rl; transform: rotate(180deg); font-family: var(--mono); font-size: 9px; text-transform: uppercase; letter-spacing: .14em; }
.grade-card strong { font-family: var(--serif); font-weight: 500; font-size: 85px; line-height: .75; letter-spacing: -.06em; }
.status-pill { margin-left: auto; padding: 6px 10px; border: 1px solid rgba(23,37,34,.28); border-radius: 50px; font-family: var(--mono); font-size: 9px; text-transform: uppercase; letter-spacing: .08em; }
.status-live { background: var(--ink); color: white; border-color: var(--ink); }
.grade-card h3 { margin: 55px 0 8px; font-family: var(--serif); font-size: 29px; font-weight: 500; }
.grade-card p { max-width: 410px; margin: 0 0 20px; color: rgba(23,37,34,.72); }
.topic-list { display: flex; gap: 8px; flex-wrap: wrap; }
.topic-list span { padding: 5px 9px; border: 1px solid rgba(23,37,34,.18); border-radius: 3px; font-size: 10px; text-transform: uppercase; letter-spacing: .07em; }
.card-link { margin-top: auto; padding: 16px 0 0; background: transparent; border: 0; border-top: 1px solid rgba(23,37,34,.22); display: flex; justify-content: space-between; cursor: pointer; font-weight: 700; }
.card-link:hover span { transform: translateX(5px); }
.card-link span { transition: transform 160ms ease; }
.card-link.muted { color: rgba(23,37,34,.68); }

.closing-note { padding: 120px 24px; text-align: center; background: var(--coral); color: white; }
.closing-note .eyebrow { justify-content: center; color: rgba(255,255,255,.72); }
.closing-note .eyebrow span { color: white; }
.closing-note blockquote { max-width: 870px; margin: 35px auto 42px; font-family: var(--serif); font-size: clamp(38px, 5vw, 65px); line-height: 1.05; letter-spacing: -.035em; }
.site-footer { padding: 30px 4vw; background: var(--ink); color: #a9b6b1; display: flex; justify-content: space-between; font-size: 12px; }
.site-footer p { margin: 0; }

/* Guided journey */
body.journey-open .site-header, body.journey-open .site-footer { display: none; }
.journey-view { min-height: 100vh; display: grid; grid-template-columns: 300px 1fr; background: var(--paper); }
.journey-sidebar { background: var(--teal-dark); color: white; padding: 30px; display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh; }
.back-home { align-self: flex-start; padding: 6px 0; background: transparent; color: #c1d3ce; border: 0; cursor: pointer; font-size: 12px; }
.back-home span { margin-right: 8px; }
.journey-meta { margin-top: 62px; }
.mini-label { color: #9ab7af; }
.journey-meta h1 { margin: 10px 0 2px; font-family: var(--serif); font-size: 31px; font-weight: 500; }
.journey-meta p { margin: 0; font-size: 12px; color: #a5beb7; }
.journey-progress { list-style: none; padding: 0; margin: 42px 0 0; display: grid; gap: 0; }
.journey-progress li { min-height: 57px; display: flex; gap: 13px; position: relative; color: #76968d; }
.journey-progress li::before { content: ""; position: absolute; top: 23px; left: 11px; width: 1px; height: 34px; background: rgba(255,255,255,.12); }
.journey-progress li:last-child::before { display: none; }
.journey-progress li > span { flex: 0 0 23px; height: 23px; display: grid; place-items: center; border: 1px solid #698b82; border-radius: 50%; font-family: var(--mono); font-size: 8px; background: var(--teal-dark); z-index: 1; }
.journey-progress b, .journey-progress small { display: block; }
.journey-progress b { font-size: 12px; line-height: 1.2; }
.journey-progress small { font-size: 10px; margin-top: 2px; }
.journey-progress li.is-active { color: white; }
.journey-progress li.is-active > span { background: var(--coral); border-color: var(--coral); }
.journey-progress li.is-complete > span { background: #b6cc79; color: var(--teal-dark); border-color: #b6cc79; }
.privacy-note { margin: auto 0 0; font-size: 10px; color: #84a49b; }
.privacy-note span { margin-right: 6px; }
.journey-main { min-width: 0; }
.journey-topbar { min-height: 74px; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: auto auto minmax(120px, 1fr) auto; align-items: center; gap: 22px; padding: 10px 34px; position: sticky; top: 0; z-index: 20; background: rgba(248,247,242,.96); backdrop-filter: blur(10px); font-family: var(--mono); text-transform: uppercase; letter-spacing: .1em; font-size: 9px; }
.journey-problem-reference { display: flex; align-items: center; gap: 12px; padding: 8px 14px; border: 1px solid rgba(31,95,85,.16); border-radius: 999px; background: #edf1e6; white-space: nowrap; }
.journey-problem-reference > span { color: var(--teal); font-size: 8px; }
.journey-problem-reference strong { color: var(--ink); font-family: var(--serif); font-size: 19px; font-weight: 500; letter-spacing: 0; text-transform: none; }
.journey-problem-reference i { color: var(--coral); font-style: normal; }
.progress-track { width: 100%; height: 2px; background: rgba(23,37,34,.12); }
.progress-track span { display: block; height: 100%; width: 16.666%; background: var(--coral); transition: width 400ms ease; }
.icon-button { width: 34px; height: 34px; border: 1px solid var(--line); border-radius: 50%; display: grid; place-items: center; background: transparent; cursor: pointer; font-size: 21px; font-weight: 300; }
.step-stage { width: min(880px, calc(100% - 64px)); margin: 0 auto; padding: 68px 0 90px; }
.journey-step { animation: step-in 350ms ease both; }
@keyframes step-in { from { opacity: 0; transform: translateY(9px); } to { opacity: 1; transform: translateY(0); } }
.step-eyebrow { color: var(--coral); margin: 0 0 13px; }
.journey-step h2 { margin: 0; font-family: var(--serif); font-size: clamp(43px, 5vw, 62px); line-height: 1; font-weight: 500; letter-spacing: -.04em; }
.step-intro { max-width: 650px; color: var(--ink-soft); line-height: 1.75; }
.problem-layout { margin-top: 40px; display: grid; grid-template-columns: 1fr 330px; gap: 55px; align-items: center; }
.problem-copy { font-family: var(--serif); font-size: 22px; line-height: 1.48; }
.problem-copy p { margin: 0 0 18px; }
.question-line { color: var(--teal); font-size: 25px; font-style: italic; }
.garden-diagram { width: 100%; aspect-ratio: 1.5; border: 2px solid var(--ink); padding: 27px; position: relative; background: repeating-linear-gradient(45deg, rgba(231,101,70,.15), rgba(231,101,70,.15) 8px, transparent 8px, transparent 15px); }
.planting-area { width: 100%; height: 100%; display: grid; place-items: center; background: #b9ccaa; border: 1px dashed var(--teal-dark); }
.planting-area span { font-family: var(--mono); font-size: 9px; text-transform: uppercase; letter-spacing: .1em; }
.diagram-top, .diagram-side, .path-arrow { position: absolute; font-family: var(--mono); font-size: 9px; }
.diagram-top { top: -23px; left: 46%; }
.diagram-side { left: -30px; top: 48%; transform: rotate(-90deg); }
.path-arrow { bottom: 6px; right: 4px; color: var(--coral); }
.expression-problem { margin: 42px 0 25px; padding: 38px 24px; display: flex; align-items: center; justify-content: center; gap: clamp(12px, 3vw, 27px); background: #e5ece8; border-radius: 9px; font-family: var(--serif); font-size: clamp(35px, 6vw, 64px); }
.expression-problem i { color: var(--ink-soft); font-style: normal; }
.expression-problem strong { width: 1.2em; height: 1.2em; display: grid; place-items: center; border: 2px solid var(--coral); background: var(--white); color: var(--coral); font-weight: 500; }
.expression-question { max-width: 700px; margin: 0; font-family: var(--serif); font-size: 24px; color: var(--teal); }
.pause-prompt { margin-top: 46px; padding: 18px 22px; border-left: 3px solid var(--mustard); background: #f4eddb; font-family: var(--serif); font-size: 18px; }
.pause-prompt span { margin-right: 15px; color: #a57600; font-family: var(--mono); font-size: 9px; text-transform: uppercase; letter-spacing: .1em; }
.writing-field { display: grid; gap: 8px; margin-top: 25px; }
.writing-field > span, .number-answer > span:first-child { font-size: 11px; font-weight: 700; }
.writing-field small { color: #8a948f; font-weight: 400; }
.writing-field textarea { width: 100%; padding: 16px 18px; border: 1px solid var(--line); border-radius: 7px; color: var(--ink); background: var(--white); line-height: 1.6; }
.writing-field textarea::placeholder, input::placeholder { color: #a7ada9; }
.step-actions { margin-top: 32px; display: flex; align-items: center; }
.step-actions.end { justify-content: flex-end; }
.step-actions.split { justify-content: space-between; gap: 15px; }
.answer-card { margin-top: 38px; padding: 24px; display: grid; grid-template-columns: 1fr 190px; gap: 20px; background: #e5ece8; border-radius: 9px; }
.answer-card .writing-field { margin: 0; }
.large-field textarea { min-height: 220px; }
.number-answer { display: grid; align-content: start; gap: 8px; }
.answer-input-wrap { min-height: 61px; display: flex; align-items: center; padding: 0 14px; border: 1px solid var(--line); border-radius: 7px; background: var(--white); }
.answer-input-wrap input { min-width: 0; width: 100%; border: 0; outline: 0; background: transparent; font-family: var(--serif); font-size: 30px; }
.answer-input-wrap b { font-size: 13px; color: var(--ink-soft); }
.field-message { min-height: 20px; color: #a8442c; font-size: 12px; }
.emotion-fieldset { margin: 40px 0 0; padding: 0; border: 0; }
.emotion-fieldset legend { margin-bottom: 13px; font-size: 11px; font-weight: 700; }
.emotion-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.emotion-grid button { min-height: 75px; display: flex; align-items: center; gap: 13px; padding: 0 18px; border: 1px solid var(--line); border-radius: 7px; background: var(--white); cursor: pointer; font-weight: 600; }
.emotion-grid button span { width: 31px; height: 31px; border: 1px solid var(--line); border-radius: 50%; display: grid; place-items: center; color: var(--teal); font-family: var(--serif); font-size: 18px; }
.emotion-grid button:hover { border-color: var(--teal); }
.emotion-grid button.is-selected { color: white; background: var(--teal); border-color: var(--teal); }
.emotion-grid button.is-selected span { border-color: rgba(255,255,255,.4); color: #ffe08b; }
.reflection-field { margin-top: 30px; }
.thinking-grid { display: grid; gap: 10px; margin-top: 40px; }
.thinking-card { border: 1px solid var(--line); border-radius: 8px; background: var(--white); overflow: hidden; }
.thinking-card.is-open { border-color: rgba(31,95,85,.45); }
.thinking-toggle { width: 100%; min-height: 82px; display: grid; grid-template-columns: 38px 1fr auto; gap: 14px; align-items: center; padding: 13px 20px; text-align: left; background: transparent; border: 0; cursor: pointer; }
.thinking-number { width: 35px; height: 35px; border-radius: 50%; display: grid; place-items: center; background: #edf1e6; color: var(--teal); font-family: var(--mono); font-size: 9px; }
.thinking-toggle b, .thinking-toggle small { display: block; }
.thinking-toggle b { font-family: var(--serif); font-size: 21px; font-weight: 500; }
.thinking-toggle small { margin-top: 3px; color: var(--ink-soft); }
.thinking-toggle i { font-size: 23px; font-style: normal; font-weight: 300; }
.thinking-content { padding: 0 20px 22px 72px; color: var(--ink-soft); }
.thinking-content p { margin-top: 0; }
.math-line { display: flex; justify-content: space-between; padding: 10px 14px; background: #f0eee7; border-bottom: 1px solid rgba(23,37,34,.08); font-family: var(--mono); font-size: 12px; }
.math-line b { color: var(--teal); }
.final-line { background: #dce9db; }
.equal-length-explainer { margin-top: 35px; padding: 26px; border: 1px solid var(--line); border-radius: 9px; background: var(--white); }
.visual-equation { margin-bottom: 26px; text-align: center; font-family: var(--serif); font-size: 31px; }
.visual-equation strong { color: var(--coral); font-weight: 500; }
.strip-visual { position: relative; max-width: 720px; margin: 0 auto; padding-bottom: 28px; }
.strip-caption { display: flex; justify-content: space-between; margin-bottom: 7px; color: var(--ink-soft); font-family: var(--mono); font-size: 9px; text-transform: uppercase; letter-spacing: .08em; }
.unit-strip { height: 64px; display: flex; border: 1.5px solid var(--ink); background-size: calc(100% / 17) 100%; background-image: linear-gradient(to right, transparent calc(100% - 1px), rgba(23,37,34,.16) 1px); }
.unit-strip + .unit-strip { margin-top: 55px; }
.strip-part { display: grid; place-items: center; position: relative; overflow: hidden; font-family: var(--serif); font-size: 23px; }
.strip-part b { position: relative; z-index: 2; font-weight: 500; }
.thirteen { flex: 0 0 76.4706%; background: #b9ccaa; }
.four { flex: 1; border-left: 1.5px solid var(--ink); background: #efc5b5; }
.unknown { flex: 0 0 64.7059%; background: #e4e0d5; transition: background 250ms ease; }
.six { flex: 1; border-left: 1.5px solid var(--ink); background: #d6d0e5; }
.borrowed-two, .extra-two { position: absolute; inset-block: 0; display: grid; place-items: center; background: rgba(216,169,49,.58); color: var(--ink); font-family: var(--mono); font-size: 10px; opacity: 0; transition: opacity 220ms ease; }
.borrowed-two { right: 0; width: 15.3846%; border-left: 2px solid var(--mustard); }
.extra-two { left: 0; width: 33.3333%; border-right: 2px solid var(--mustard); }
.comparison-arrow { position: absolute; top: 87px; left: 68%; color: var(--coral); font-family: var(--serif); font-size: 31px; opacity: 0; transition: opacity 220ms ease; }
.strip-scale { position: relative; height: 22px; color: var(--ink-soft); font-family: var(--mono); font-size: 8px; }
.strip-scale span { position: absolute; top: 8px; transform: translateX(-50%); opacity: 0; transition: opacity 220ms ease; }
.strip-scale span:nth-child(1) { left: 0; transform: none; }
.strip-scale span:nth-child(2) { left: 64.7059%; }
.strip-scale span:nth-child(3) { left: 76.4706%; }
.strip-scale span:nth-child(4) { right: 0; transform: none; }
.equal-length-explainer[data-expression-stage="2"] .four,
.equal-length-explainer[data-expression-stage="2"] .six,
.equal-length-explainer[data-expression-stage="3"] .four,
.equal-length-explainer[data-expression-stage="3"] .six,
.equal-length-explainer[data-expression-stage="4"] .four,
.equal-length-explainer[data-expression-stage="4"] .six { box-shadow: inset 0 0 0 2px var(--mustard); }
.equal-length-explainer[data-expression-stage="2"] .extra-two,
.equal-length-explainer[data-expression-stage="3"] .extra-two,
.equal-length-explainer[data-expression-stage="4"] .extra-two,
.equal-length-explainer[data-expression-stage="3"] .borrowed-two,
.equal-length-explainer[data-expression-stage="4"] .borrowed-two,
.equal-length-explainer[data-expression-stage="3"] .comparison-arrow,
.equal-length-explainer[data-expression-stage="4"] .comparison-arrow,
.equal-length-explainer[data-expression-stage="4"] .strip-scale span { opacity: 1; }
.equal-length-explainer[data-expression-stage="4"] .unknown { background: #b9ccaa; }
.halves-groups-explainer { margin-top: 35px; padding: 26px; border: 1px solid var(--line); border-radius: 9px; background: var(--white); }
.division-visual { max-width: 720px; margin: 0 auto; }
.whole-sixty-four { min-height: 122px; display: grid; grid-template-columns: 1fr 1fr; position: relative; overflow: hidden; border: 1.5px solid var(--ink); background: #b9ccaa; transition: background 220ms ease; }
.whole-label { position: absolute; inset: 0; z-index: 2; display: grid; place-items: center; font-family: var(--serif); font-size: 37px; transition: opacity 220ms ease; }
.half-block { display: grid; place-items: center; align-content: center; opacity: 0; background: #b9ccaa; transition: opacity 220ms ease, filter 220ms ease; }
.half-block + .half-block { border-left: 2px solid var(--ink); background: #d6d0e5; }
.half-block b { font-family: var(--serif); font-size: 31px; font-weight: 500; }
.half-block small { margin-top: 3px; color: var(--ink-soft); font-family: var(--mono); font-size: 8px; letter-spacing: .08em; text-transform: uppercase; }
.visual-transfer { display: none; margin: 12px 0; color: var(--coral); text-align: center; font-family: var(--mono); font-size: 9px; letter-spacing: .08em; text-transform: uppercase; }
.eight-groups { display: none; grid-template-columns: repeat(8, 1fr); border: 1.5px solid var(--ink); }
.eight-groups span { min-height: 72px; display: grid; place-items: center; background: #edf1e6; border-right: 1px solid rgba(23,37,34,.35); }
.eight-groups span:last-child { border-right: 0; }
.eight-groups b { font-family: var(--serif); font-size: 24px; font-weight: 500; }
.halves-groups-explainer[data-group-stage="2"] .whole-label,
.halves-groups-explainer[data-group-stage="3"] .whole-label,
.halves-groups-explainer[data-group-stage="4"] .whole-label { opacity: 0; }
.halves-groups-explainer[data-group-stage="2"] .half-block,
.halves-groups-explainer[data-group-stage="3"] .half-block,
.halves-groups-explainer[data-group-stage="4"] .half-block { opacity: 1; }
.halves-groups-explainer[data-group-stage="2"] .half-one,
.halves-groups-explainer[data-group-stage="3"] .half-one,
.halves-groups-explainer[data-group-stage="4"] .half-one { box-shadow: inset 0 0 0 3px var(--mustard); }
.halves-groups-explainer[data-group-stage="3"] .half-two,
.halves-groups-explainer[data-group-stage="4"] .half-two { filter: saturate(.45) opacity(.58); }
.halves-groups-explainer[data-group-stage="3"] .visual-transfer,
.halves-groups-explainer[data-group-stage="4"] .visual-transfer { display: block; }
.halves-groups-explainer[data-group-stage="3"] .eight-groups,
.halves-groups-explainer[data-group-stage="4"] .eight-groups { display: grid; }
.halves-groups-explainer[data-group-stage="4"] .eight-groups span { background: #dce9db; box-shadow: inset 0 0 0 1px rgba(31,95,85,.18); }
.visual-explanation { min-height: 70px; margin-top: 16px; display: grid; grid-template-columns: 38px 1fr; gap: 15px; align-items: start; padding-top: 18px; border-top: 1px solid var(--line); }
.visual-explanation > span { width: 35px; height: 35px; border-radius: 50%; display: grid; place-items: center; background: #edf1e6; color: var(--teal); font-family: var(--mono); font-size: 9px; }
.visual-explanation p { margin: 4px 0 0; color: var(--ink-soft); }
.visual-explanation b { color: var(--ink); }
.visual-controls { display: flex; justify-content: space-between; gap: 12px; margin-top: 14px; }
.visual-controls .button:disabled { opacity: .38; cursor: not-allowed; transform: none; }
.step-actions .button:disabled { opacity: .38; cursor: not-allowed; transform: none; }
.insight-note { margin-top: 18px; display: flex; align-items: center; gap: 16px; padding: 16px 20px; background: #f6e4dc; border-radius: 7px; }
.insight-note p { margin: 0; font-family: var(--serif); font-size: 17px; }
.insight-mark { flex: 0 0 31px; height: 31px; border-radius: 50%; display: grid; place-items: center; background: var(--coral); color: white; font-family: var(--serif); }
.answer-feedback { margin-top: 30px; padding: 18px 20px; border-radius: 7px; background: #e2ece4; color: var(--teal-dark); }
.answer-feedback.needs-work { background: #f6e4dc; color: #813b29; }
.compact-emotions { margin-top: 28px; }
.completion-step { padding-top: 20px; text-align: center; }
.completion-mark { width: 78px; height: 78px; margin: 0 auto 24px; border: 1px solid rgba(31,95,85,.24); border-radius: 50%; display: grid; place-items: center; position: relative; }
.completion-mark::before { content: ""; position: absolute; width: 98px; height: 98px; border: 1px solid rgba(231,101,70,.2); border-radius: 50%; }
.completion-mark span { width: 51px; height: 51px; border-radius: 50%; display: grid; place-items: center; background: var(--teal); color: white; font-size: 21px; }
.completion-step .step-eyebrow { text-align: center; }
.completion-step h2 { margin-inline: auto; }
.completion-intro { max-width: 570px; margin: 20px auto 0; color: var(--ink-soft); font-family: var(--serif); font-size: 20px; }
.reflection-summary { max-width: 570px; margin: 36px auto 0; display: grid; grid-template-columns: 1fr 50px 1fr; align-items: center; padding: 25px; background: #e5ece8; border-radius: 9px; }
.reflection-summary span, .reflection-summary b { display: block; }
.reflection-summary div > span { color: var(--ink-soft); font-family: var(--mono); font-size: 8px; text-transform: uppercase; letter-spacing: .1em; }
.reflection-summary b { margin-top: 8px; font-family: var(--serif); font-size: 25px; font-weight: 500; }
.summary-arrow { color: var(--coral); }
.completion-step blockquote { max-width: 620px; margin: 25px auto 0; padding: 20px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font-family: var(--serif); font-style: italic; font-size: 22px; }
.completion-actions { margin-top: 32px; display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; }

/* Dialogs */
dialog { border: 0; color: var(--ink); }
dialog::backdrop { background: rgba(12,25,21,.62); backdrop-filter: blur(4px); }
.notebook-dialog { width: min(680px, calc(100% - 32px)); max-height: 82vh; padding: 0; border-radius: 10px; background: var(--paper); box-shadow: var(--shadow); }
.dialog-head { padding: 25px 28px; display: flex; justify-content: space-between; align-items: start; border-bottom: 1px solid var(--line); }
.dialog-head h2 { margin: 6px 0 0; font-family: var(--serif); font-size: 32px; font-weight: 500; }
#notebook-content { padding: 28px; }
.empty-notebook { padding: 40px 10px; text-align: center; color: var(--ink-soft); }
.notebook-entry { padding: 22px 0; border-bottom: 1px solid var(--line); }
.notebook-entry:first-child { padding-top: 0; }
.notebook-entry:last-child { border-bottom: 0; }
.notebook-entry header { display: flex; justify-content: space-between; align-items: center; gap: 15px; }
.notebook-entry h3 { margin: 0; font-family: var(--serif); font-size: 23px; font-weight: 500; }
.notebook-entry time { color: var(--ink-soft); font-family: var(--mono); font-size: 9px; }
.emotion-shift { display: flex; align-items: center; gap: 10px; margin: 15px 0; font-size: 12px; }
.emotion-shift span { padding: 5px 10px; background: #e5ece8; border-radius: 50px; }
.notebook-entry blockquote { margin: 0; color: var(--ink-soft); font-family: var(--serif); font-style: italic; }
.grade-seven-dialog { width: min(700px, calc(100% - 32px)); padding: 46px; border-radius: 10px; background: var(--paper); box-shadow: var(--shadow); }
.grade-seven-dialog h2 { max-width: 520px; margin: 12px 0; font-family: var(--serif); font-size: 42px; font-weight: 500; line-height: 1.05; }
.journey-dialog-intro { max-width: 560px; margin: 0; color: var(--ink-soft); line-height: 1.65; }
.journey-choice-list { display: grid; gap: 12px; margin-top: 30px; }
.journey-choice { width: 100%; display: grid; grid-template-columns: 90px 1fr auto; grid-template-areas: "index equation arrow" "index note arrow"; gap: 2px 18px; align-items: center; padding: 20px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: var(--white); text-align: left; cursor: pointer; transition: border-color 180ms ease, transform 180ms ease, background 180ms ease; }
.journey-choice:hover { border-color: var(--teal); background: #edf1e6; transform: translateY(-2px); }
.journey-choice > span { grid-area: index; color: var(--coral); font-family: var(--mono); font-size: 9px; text-transform: uppercase; letter-spacing: .08em; }
.journey-choice strong { grid-area: equation; font-family: var(--serif); font-size: 26px; font-weight: 500; }
.journey-choice small { grid-area: note; color: var(--ink-soft); }
.journey-choice i { grid-area: arrow; color: var(--teal); font-size: 22px; font-style: normal; }
.planned-dialog { width: min(500px, calc(100% - 32px)); padding: 55px 48px 45px; border-radius: 10px; overflow: hidden; background: var(--paper); }
.dialog-close { position: absolute; right: 18px; top: 18px; }
.grade-orbit { position: absolute; right: -32px; bottom: -88px; width: 210px; height: 210px; border: 1px solid var(--line); border-radius: 50%; display: grid; place-items: center; font-family: var(--serif); font-size: 100px; color: rgba(23,37,34,.08); }
.planned-dialog h2 { margin: 13px 0; font-family: var(--serif); font-size: 38px; font-weight: 500; line-height: 1.05; }
.planned-dialog p:not(.mini-label) { margin-bottom: 28px; color: var(--ink-soft); line-height: 1.7; }
.toast { position: fixed; z-index: 100; left: 50%; bottom: 25px; transform: translate(-50%, 20px); padding: 12px 18px; border-radius: 6px; background: var(--ink); color: white; font-size: 12px; opacity: 0; pointer-events: none; transition: opacity 180ms ease, transform 180ms ease; }
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

.reveal { animation: reveal-up 650ms ease both; }
.delay-one { animation-delay: 100ms; }
@keyframes reveal-up { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 900px) {
  .hero-shell { grid-template-columns: 1fr; padding-top: 45px; }
  .hero-copy { max-width: 700px; }
  .hero-visual { min-height: 560px; }
  .method-heading, .grades-heading { grid-template-columns: 1fr; }
  .method-steps { grid-template-columns: repeat(2, 1fr); gap: 45px 0; }
  .method-steps li:nth-child(3) { padding-left: 0; border-left: 0; }
  .journey-view { grid-template-columns: 220px 1fr; }
  .journey-sidebar { padding: 24px 20px; }
  .problem-layout { grid-template-columns: 1fr; }
  .garden-diagram { max-width: 390px; margin: 15px auto; }
  .emotion-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 680px) {
  .site-header { width: min(100% - 28px, 1240px); height: 72px; }
  .top-nav a { display: none; }
  .brand { font-size: 13px; }
  .brand-mark { width: 27px; height: 27px; }
  .hero-shell, .grades-section { width: min(100% - 32px, 1240px); }
  .hero-shell { padding: 35px 0 70px; gap: 20px; }
  .hero-copy h1 { font-size: clamp(48px, 15vw, 68px); }
  .hero-intro { font-size: 16px; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-visual { min-height: 475px; }
  .problem-preview { width: 91%; min-height: 430px; padding: 22px 25px; }
  .problem-preview > p { font-size: 19px; }
  .orbit-one { width: 390px; height: 390px; }
  .orbit-two { width: 280px; height: 280px; }
  .method-section { padding-block: 76px; }
  .method-steps { grid-template-columns: 1fr; margin-top: 55px; }
  .method-steps li, .method-steps li:nth-child(3) { min-height: 215px; padding: 26px 0 0; border-left: 0; border-top: 1px solid rgba(255,255,255,.14); }
  .method-symbol { margin: 23px 0 19px; }
  .grades-section { padding-block: 78px; }
  .grade-grid { grid-template-columns: 1fr; }
  .grade-card { min-height: 350px; padding: 27px; }
  .closing-note { padding: 82px 20px; }
  .site-footer { gap: 15px; flex-direction: column; text-align: center; }
  .journey-view { display: block; }
  .journey-sidebar { position: static; height: auto; padding: 17px 18px; }
  .journey-sidebar .journey-meta, .journey-sidebar .journey-progress, .journey-sidebar .privacy-note { display: none; }
  .back-home { padding: 0; }
  .journey-topbar { min-height: 96px; padding: 10px 17px; gap: 8px 13px; grid-template-columns: auto 1fr auto; grid-template-areas: "step progress close" "problem problem problem"; }
  #step-label { grid-area: step; }
  .progress-track { grid-area: progress; }
  .icon-button { grid-area: close; }
  .journey-problem-reference { grid-area: problem; justify-content: center; padding: 7px 12px; }
  .journey-problem-reference strong { font-size: 18px; }
  .step-stage { width: min(100% - 32px, 880px); padding: 45px 0 70px; }
  .journey-step h2 { font-size: 43px; }
  .problem-copy { font-size: 19px; }
  .garden-diagram { width: calc(100% - 32px); }
  .expression-problem { gap: 10px; padding: 30px 12px; }
  .equal-length-explainer, .halves-groups-explainer { padding: 18px 12px; }
  .unit-strip { height: 54px; }
  .comparison-arrow { top: 78px; }
  .whole-sixty-four { min-height: 105px; }
  .eight-groups { grid-template-columns: repeat(4, 1fr); }
  .eight-groups span { min-height: 58px; }
  .eight-groups span:nth-child(4) { border-right: 0; }
  .eight-groups span:nth-child(-n+4) { border-bottom: 1px solid rgba(23,37,34,.35); }
  .visual-controls { flex-direction: column-reverse; }
  .visual-controls .button { width: 100%; }
  .pause-prompt { font-size: 16px; }
  .answer-card { grid-template-columns: 1fr; padding: 16px; }
  .large-field textarea { min-height: 170px; }
  .emotion-grid { grid-template-columns: 1fr 1fr; }
  .emotion-grid button { min-height: 65px; padding: 0 12px; font-size: 12px; }
  .thinking-toggle { padding-inline: 13px; }
  .thinking-content { padding-left: 64px; }
  .step-actions.split { align-items: stretch; flex-direction: column-reverse; }
  .step-actions .button { width: 100%; }
  .reflection-summary { padding: 20px 10px; }
  .grade-seven-dialog { padding: 48px 20px 24px; }
  .grade-seven-dialog h2 { font-size: 35px; }
  .journey-choice { grid-template-columns: 1fr auto; grid-template-areas: "index arrow" "equation arrow" "note arrow"; gap: 5px 12px; padding: 17px; }
  .journey-choice strong { font-size: 23px; }
  .planned-dialog { padding: 55px 28px 35px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}