:root {
  --paper: #f2eee5;
  --ink: #151511;
  --muted: #67635b;
  --line: #cbc3b6;
  --orange: #ef740b;
  --teal: #007f79;
  --red: #c8382b;
  --blue: #315f9c;
  --cream: #faf7f0;
  --white: #fffdf8;
  --shadow: 7px 7px 0 var(--ink);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, "Noto Sans KR", "Noto Sans JP", sans-serif;
  line-height: 1.55;
}
a { color: inherit; }
button, input { font: inherit; }

.shell { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(242, 238, 229, .96);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { text-decoration: none; display: flex; align-items: baseline; gap: 10px; }
.brand strong { font-size: 25px; letter-spacing: -.03em; }
.brand span { font-family: Georgia, serif; font-size: 17px; color: var(--ink); }
.main-nav { display: flex; gap: 24px; align-items: center; font-weight: 700; font-size: 14px; }
.main-nav a { text-decoration: none; padding: 8px 0; }
.main-nav a:hover, .main-nav a:focus-visible { color: var(--orange); }
.status-pill { border: 1px solid var(--ink); border-radius: 999px; padding: 7px 12px; font-size: 12px; background: var(--cream); }

.eyebrow { margin: 0 0 18px; font-size: 12px; font-weight: 900; letter-spacing: .18em; text-transform: uppercase; }
.hero { padding: 76px 0 0; border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(390px, .92fr); gap: 58px; align-items: center; padding-bottom: 66px; }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { margin: 0; max-width: 850px; font-size: clamp(44px, 6.6vw, 84px); line-height: 1.02; letter-spacing: -.055em; }
.hero-message h1 { font-size: clamp(44px, 5.3vw, 70px); }
.hero-message h1 span { color: #f03b18; }
.hero-copy { margin: 30px 0 0; max-width: 760px; font-size: 19px; }
.hero-copy strong { color: var(--ink); }
.method-label { margin: 22px 0 0; padding-left: 13px; border-left: 4px solid #f03b18; color: var(--muted); font-size: 14px; font-weight: 850; letter-spacing: .03em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button { border: 1px solid var(--ink); padding: 12px 16px; }
.button.primary { background: var(--ink); color: var(--white); }
.button.secondary { background: transparent; }
.hero .button.primary { background: #f03b18; border-color: #f03b18; }
.hero .button.secondary { background: #245cff; border-color: #245cff; color: var(--white); }
.button:hover, .button:focus-visible { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--orange); }
.assembly-panel { border-bottom: 12px solid #f03b18; background: var(--ink); color: var(--white); padding: 28px 30px 25px; }
.assembly-panel { scroll-margin-top: 92px; }
.assembly-head { display: flex; justify-content: space-between; gap: 16px; padding-bottom: 16px; border-bottom: 1px solid #4a4a46; font-size: 11px; font-weight: 900; letter-spacing: .12em; }
.assembly-head b { color: #6f91ff; }
.assembly-block { margin-top: 25px; }
.assembly-block small { display: block; margin-bottom: 10px; font-weight: 900; letter-spacing: .08em; }
.token-row { display: flex; flex-wrap: wrap; gap: 7px; }
.token-row span { padding: 9px 12px; font-size: clamp(15px, 1.8vw, 20px); font-weight: 900; }
.token-row.source span { background: #f03b18; }
.token-row.target span { background: #245cff; }
.assembly-rule { display: flex; align-items: center; justify-content: center; gap: 22px; margin: 22px 0; font-size: 11px; font-weight: 900; }
.assembly-rule strong { font-size: 27px; }
.assembly-panel > p { margin: 24px 0 0; padding-top: 17px; border-top: 1px solid #4a4a46; color: #d9d7cf; font-size: 13px; }
.assembly-panel > p span { color: #8f8d86; }
.assembly-panel > p .particle-note { color: #8aa7ff; font-weight: 900; }

.section { padding: 78px 0; border-bottom: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 240px 1fr; gap: 64px; margin-bottom: 36px; }
.section-heading h2 { margin: 0; font-size: clamp(30px, 4vw, 50px); line-height: 1.12; letter-spacing: -.035em; }
.path-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--ink); }
.path-card { position: relative; min-height: 330px; padding: 30px; background: var(--cream); }
.path-card + .path-card { border-left: 1px solid var(--ink); }
.path-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 7px; background: var(--accent); }
.path-card.teal { --accent: var(--teal); }
.path-card.orange { --accent: var(--orange); }
.path-card.red { --accent: var(--red); }
.path-card.blue { --accent: var(--blue); }
.path-top { display: flex; justify-content: space-between; color: var(--accent); font-weight: 900; letter-spacing: .08em; }
.path-card h3 { margin: 58px 0 18px; font-size: 32px; line-height: 1.18; }
.path-card p { color: var(--muted); min-height: 78px; }
.path-card a, .button { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; font-weight: 900; }
.path-card a { border-bottom: 2px solid var(--accent); padding-bottom: 4px; }

.demo-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: 22px; align-items: stretch; }
.demo-card { border: 1px solid var(--ink); background: var(--cream); padding: 28px; display: grid; align-content: start; gap: 18px; }
.demo-card.accent { background: var(--ink); color: var(--white); }
.demo-card small { color: var(--orange); font-weight: 900; letter-spacing: .08em; }
.demo-card strong { font-size: clamp(22px, 3vw, 34px); line-height: 1.35; }
.demo-card p { margin: 0; color: var(--muted); }
.demo-card.accent p { color: #d5d1c8; }
.demo-arrow { align-self: center; font-family: Georgia, serif; font-size: 46px; }

.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--ink); background: var(--cream); }
.steps-grid article { min-height: 220px; padding: 26px; border-right: 1px solid var(--line); }
.steps-grid article:last-child { border-right: 0; }
.steps-grid span { display: block; color: var(--orange); font-family: Georgia, serif; font-size: 20px; }
.steps-grid h3 { margin: 46px 0 10px; font-size: 24px; }
.steps-grid p { margin: 0; color: var(--muted); }
.home-steps { border-width: 1px 0 0; }
.home-steps article { min-height: 120px; display: grid; grid-template-columns: 34px 1fr; align-content: center; column-gap: 10px; padding: 24px 22px; }
.home-steps h3 { margin: 0; font-size: 18px; }
.home-steps p { grid-column: 2; font-size: 13px; }

.hero-message h1, .method-principle h2, .home-explore h2, .about-page h1, .about-page h2, .about-page h3, .about-page blockquote { word-break: keep-all; }

.method-principle .section-heading { margin-bottom: 24px; }
.principle-lead { margin: 0 0 42px 304px; max-width: 760px; color: var(--muted); font-size: 20px; }
.method-steps { display: grid; gap: 13px; }
.method-steps article { display: grid; grid-template-columns: 110px minmax(0, 1fr); gap: 6px 26px; align-items: center; padding: 21px 28px; border: 1px solid var(--line); }
.method-steps article:nth-child(1) { width: 100%; background: #f7d8cf; }
.method-steps article:nth-child(2) { width: 86%; margin-left: 7%; background: #dce5fb; }
.method-steps article:nth-child(3) { width: 70%; margin-left: 15%; background: var(--ink); color: var(--white); }
.method-steps span { grid-row: 1 / 3; color: #f03b18; font-weight: 900; }
.method-steps article:nth-child(2) span { color: #245cff; }
.method-steps strong { font-size: 20px; }
.method-steps p { margin: 0; color: var(--muted); font-size: 14px; }
.method-steps article:nth-child(3) p { color: #c8c5bd; }

.about-hero { padding: 76px 0 70px; border-bottom: 1px solid var(--line); }
.about-hero-grid { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(310px, .45fr); gap: 44px; align-items: end; }
.about-hero h1 { max-width: 900px; font-size: clamp(38px, 4.4vw, 56px); line-height: 1.08; }
.about-hero h1 span { color: #f03b18; }
.about-definition { background: var(--ink); color: var(--white); border-bottom: 10px solid #f03b18; padding: 30px; }
.about-definition small { display: block; margin-bottom: 38px; color: #7ea0ff; font-weight: 900; letter-spacing: .12em; }
.about-definition strong { display: block; font-size: clamp(25px, 2.8vw, 35px); line-height: 1.25; }
.about-definition p { margin: 26px 0 0; padding-top: 18px; border-top: 1px solid #474743; color: #d7d4cb; }
.about-copy-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 38px; margin-left: 304px; }
.about-copy-grid p { margin: 0; font-size: 18px; }
.about-intro blockquote { margin: 50px 0 0; padding: 36px 44px; border: 1px solid var(--ink); border-left: 9px solid #f03b18; background: var(--cream); font-size: clamp(24px, 3.2vw, 38px); font-weight: 900; line-height: 1.35; }

.about-process { padding: 82px 0; background: var(--ink); color: var(--white); }
.about-process .section-heading { margin-bottom: 44px; }
.about-process .section-heading h2 { color: var(--white); }
.about-process .eyebrow { color: #7ea0ff; }
.process-track { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid #4b4b46; }
.process-track article { min-height: 250px; padding: 27px; border-right: 1px solid #4b4b46; }
.process-track article:last-child { border-right: 0; }
.process-track span { color: #ff5c3d; font-family: Georgia, serif; font-size: 21px; }
.process-track h3 { margin: 48px 0 15px; font-size: 24px; }
.process-track p { margin: 0; color: #c9c6bd; }

.contrast-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border: 1px solid var(--ink); }
.contrast-grid > div { padding: 20px 28px; border-bottom: 1px solid var(--line); }
.contrast-grid > div:nth-last-child(-n+2) { border-bottom: 0; }
.contrast-grid > div:nth-child(even) { border-left: 1px solid var(--line); background: var(--cream); }
.contrast-grid .contrast-head { padding-top: 24px; padding-bottom: 24px; font-size: 18px; font-weight: 900; }
.contrast-grid .contrast-head.old { color: var(--muted); }
.contrast-grid .contrast-head.new { color: #245cff; }
.contrast-grid strong { color: var(--ink); }

.about-finale { padding: 86px 0; background: #123b36; color: var(--white); }
.about-finale .eyebrow { color: #e3aa42; }
.about-finale h2 { margin: 0; max-width: 1050px; font-size: clamp(35px, 4.6vw, 58px); line-height: 1.12; letter-spacing: -.04em; }
.about-finale .button.primary { background: #e3aa42; border-color: #e3aa42; color: #123b36; }
.about-finale .button.secondary { border-color: var(--white); color: var(--white); }

.course-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.course-card { --accent: var(--orange); position: relative; border: 1px solid var(--ink); background: var(--cream); padding: 28px; min-height: 330px; display: flex; flex-direction: column; }
.course-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 7px; background: var(--accent); }
.course-card.teal { --accent: var(--teal); }
.course-card.orange { --accent: var(--orange); }
.course-card.red { --accent: var(--red); }
.course-card.blue { --accent: var(--blue); }
.course-card .direction { display: flex; align-items: center; gap: 12px; color: var(--accent); margin: 7px 0 10px; }
.course-card > small { color: var(--muted); font-weight: 900; }
.course-card h3 { margin: 34px 0 4px; font-size: clamp(25px, 3vw, 34px); line-height: 1.2; }
.course-card .native-title { margin: 0 0 16px; color: var(--accent); font-weight: 800; }
.course-card > p:not(.native-title) { color: var(--muted); }
.course-card > a { margin-top: auto; align-self: flex-start; text-decoration: none; border-bottom: 2px solid var(--accent); padding-bottom: 4px; font-weight: 900; }
.family-grid .course-card { min-height: 360px; }
.family-grid .course-card > p:not(.native-title) { flex: 1; }
.family-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; margin-top: 20px; }
.family-actions a { color: var(--ink); font-weight: 900; text-decoration: none; border-bottom: 2px solid var(--blue); padding-bottom: 4px; }
.family-actions a:last-child { font-size: 14px; font-weight: 700; }
.section-action { margin-top: 28px; }

.page-hero { padding: 76px 0 56px; border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(30px, 4vw, 50px); }
.direction-picker { border: 2px solid var(--ink); background: var(--cream); padding: 28px; display: flex; flex-wrap: wrap; gap: 14px; align-items: center; font-size: clamp(18px, 2.4vw, 28px); font-weight: 800; box-shadow: var(--shadow); }
.direction-picker label { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.direction-picker select { min-width: 180px; padding: 10px 38px 10px 12px; border: 1px solid var(--ink); background: var(--white); font: inherit; }
.result-count { margin: 34px 0 14px; color: var(--muted); font-weight: 900; }
.empty-state { border: 1px solid var(--line); background: var(--cream); padding: 38px; }
.empty-state p { margin-bottom: 0; color: var(--muted); }

.future-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.future-card { border: 1px solid var(--line); background: rgba(255,255,255,.28); padding: 22px; min-height: 170px; }
.future-card span { color: var(--muted); font-size: 12px; font-weight: 900; letter-spacing: .12em; }
.future-card h3 { margin: 36px 0 8px; font-size: 22px; }
.future-card p { margin: 0; color: var(--muted); font-size: 14px; }

.course-hero { padding: 70px 0 58px; border-bottom: 1px solid var(--line); }
.course-hero.teal { --course: var(--teal); }
.course-hero.orange { --course: var(--orange); }
.course-hero.red { --course: var(--red); }
.course-hero.blue { --course: var(--blue); }
.course-hero .eyebrow { color: var(--course); }
.course-hero h1 { font-size: clamp(30px, 4vw, 50px); }
.course-meta { margin-top: 24px; display: flex; gap: 10px; flex-wrap: wrap; }
.course-meta span { border: 1px solid var(--line); background: var(--cream); padding: 8px 12px; font-size: 13px; }
.module-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--ink); }
.module-grid.four { grid-template-columns: repeat(4, 1fr); }
.module-card { min-height: 210px; padding: 24px; text-decoration: none; background: var(--cream); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.module-card:nth-child(3n) { border-right: 0; }
.module-card:nth-child(n+4) { border-bottom: 0; }
.module-grid.four .module-card { border-bottom: 0; }
.module-grid.four .module-card:nth-child(3n) { border-right: 1px solid var(--line); }
.module-grid.four .module-card:last-child { border-right: 0; }
.module-card small { color: var(--muted); font-weight: 900; }
.module-card h3 { margin: 46px 0 10px; font-size: 24px; }
.module-card p { margin: 0; color: var(--muted); font-size: 14px; }

.course-native-title { margin: 12px 0 0; color: var(--course); font-size: 18px; font-weight: 900; }
.section-copy { max-width: 760px; margin: -12px 0 28px; color: var(--muted); font-size: 17px; }
.course-nav { display: flex; align-items: center; gap: 4px; overflow-x: auto; border-bottom: 1px solid var(--line); padding: 13px 0; }
.course-nav a { flex: 0 0 auto; text-decoration: none; padding: 9px 12px; font-weight: 850; color: var(--muted); }
.course-nav a:hover, .course-nav a:focus-visible, .course-nav a.active { background: var(--ink); color: var(--white); }

.catalog-tools { border: 1px solid var(--ink); background: var(--cream); padding: 22px; margin-bottom: 28px; display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 14px; }
.catalog-tools label { display: block; font-size: 12px; font-weight: 900; margin-bottom: 8px; }
.catalog-tools input { width: min(520px, 100%); padding: 13px 14px; background: var(--white); border: 1px solid var(--line); }
.catalog-tools > span { color: var(--muted); font-weight: 900; }
.lesson-list { border-top: 2px solid var(--ink); }
.lesson-row { display: grid; grid-template-columns: 76px 1fr auto; gap: 24px; align-items: center; padding: 23px 12px; border-bottom: 1px solid var(--line); }
.lesson-row .number { font-family: Georgia, serif; font-size: 21px; }
.lesson-row small { display: block; color: var(--teal); font-weight: 900; margin-bottom: 4px; }
.lesson-row strong { font-size: 18px; }
.lesson-row a { text-decoration: none; font-weight: 900; }
.resource-row .row-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.resource-row .row-actions a { border: 1px solid var(--line); padding: 8px 11px; background: var(--white); }

.module-shell { padding: 56px 0 80px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; color: var(--muted); font-size: 13px; }
.breadcrumbs a { text-decoration: none; }
.module-heading { border: 1px solid var(--line); background: var(--cream); padding: 34px; }
.module-heading h1 { font-size: 27px; line-height: 1.3; letter-spacing: -.025em; }
.module-heading p { max-width: 760px; color: var(--muted); }
.staging-note { margin-top: 28px; border: 2px solid var(--ink); background: var(--white); padding: 28px; box-shadow: var(--shadow); }
.staging-note strong { display: block; color: var(--orange); margin-bottom: 8px; }
.content-panel { margin-top: 28px; border-top: 2px solid var(--ink); }
.content-source { display: flex; justify-content: space-between; gap: 18px; padding: 16px 4px; color: var(--teal); font-size: 12px; letter-spacing: .08em; }
.content-section { border: 1px solid var(--line); border-bottom: 0; background: var(--cream); padding: 28px; }
.content-section:last-child { border-bottom: 1px solid var(--line); }
.content-section h2 { margin: 0 0 20px; font-size: 27px; }
.content-section .content-subheading { margin: 22px 0 10px; font-size: 18px; line-height: 1.45; }
.content-section p { margin: 8px 0; }
.content-section ul, .content-section ol { margin: 12px 0; padding-left: 24px; }
.content-section li { margin: 7px 0; line-height: 1.75; }
.content-section blockquote { margin: 18px 0; padding: 14px 18px; border-left: 4px solid var(--orange); background: var(--white); }
.content-section blockquote p { margin: 5px 0; }
.content-section code { padding: 2px 5px; border: 1px solid var(--line); background: var(--white); font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.content-code { margin: 16px 0; padding: 14px 18px; border-left: 4px solid var(--teal); background: var(--white); }
.content-code p { margin: 6px 0; }
.content-section hr { border: 0; border-top: 1px solid var(--line); margin: 24px 0; }
.content-table-wrap { margin: 18px 0; overflow-x: auto; }
.content-table-wrap table { width: 100%; min-width: 680px; border-collapse: collapse; background: var(--white); }
.content-table-wrap th, .content-table-wrap td { padding: 11px 12px; border: 1px solid var(--line); text-align: left; vertical-align: top; line-height: 1.65; }
.content-table-wrap th { background: var(--ink); color: var(--white); font-size: 13px; }
.content-field { margin: 12px 0; }
.content-field > strong { display: block; margin-bottom: 6px; color: var(--muted); font-size: 13px; }
.section-nav { position: sticky; top: 69px; z-index: 5; display: flex; gap: 6px; overflow-x: auto; margin-top: 18px; padding: 10px; border: 1px solid var(--line); background: rgba(250, 247, 240, .97); }
.section-nav a { flex: 0 0 auto; max-width: 230px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; text-decoration: none; padding: 8px 10px; font-size: 13px; font-weight: 800; }
.section-nav a:hover, .section-nav a:focus-visible { background: var(--ink); color: var(--white); }
.section-nav span { display: inline-grid; place-items: center; width: 22px; height: 22px; margin-right: 6px; border-radius: 50%; background: var(--orange); color: var(--ink); font-size: 11px; }
.module-nav { margin-top: 48px; display: flex; flex-wrap: wrap; gap: 9px; }
.module-nav a { text-decoration: none; border: 1px solid var(--line); border-radius: 999px; padding: 9px 13px; background: var(--cream); font-weight: 800; font-size: 13px; }
.module-nav a.active { background: var(--ink); color: var(--white); border-color: var(--ink); }
.resource-kind-nav { margin: 0 0 28px; display: flex; flex-wrap: wrap; gap: 9px; }
.resource-kind-nav a { text-decoration: none; border: 1px solid var(--line); padding: 10px 14px; background: var(--white); font-weight: 800; font-size: 13px; }
.resource-kind-nav a.active { background: var(--ink); color: var(--white); border-color: var(--ink); }
.lesson-pagination { margin-top: 22px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.lesson-pagination a { min-height: 88px; display: flex; flex-direction: column; justify-content: center; gap: 5px; border: 1px solid var(--line); background: var(--cream); padding: 16px; text-decoration: none; }
.lesson-pagination a.next { text-align: right; }
.lesson-pagination small { color: var(--muted); }

.game-engine { margin-top: 28px; }
.game-stage { margin-top: 45px; padding: 40px; border: 1px solid var(--ink); background: var(--ink); color: var(--white); }
.game-progress { display: flex; justify-content: space-between; color: #c7ff32; font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.game-stage h2 { margin: 45px 0; color: var(--white); font-size: clamp(29px, 4vw, 48px); line-height: 1.3; }
.game-options { display: grid; gap: 10px; }
.game-options button, .game-feedback button, .game-finish button { min-height: 58px; padding: 12px 18px; border: 1px solid #756f66; background: transparent; color: var(--white); text-align: left; font-weight: 800; cursor: pointer; }
.game-options button:hover { border-color: #c7ff32; }
.game-options button.correct { background: #177e78; border-color: #8ae4dc; }
.game-options button.wrong { background: #883b33; }
.game-options button.muted { opacity: .42; }
.game-feedback { margin-top: 25px; padding: 25px; background: #292922; line-height: 1.7; }
.game-feedback.correct { border-left: 7px solid #66d0c9; }
.game-feedback.wrong { border-left: 7px solid #e77468; }
.game-feedback button { margin-top: 12px; background: var(--white); color: var(--ink); }
.game-finish { margin-top: 45px; padding: 40px; border: 1px solid var(--ink); background: var(--cream); }
.game-finish h2 { font-size: 38px; }
.game-finish button { background: var(--ink); }

.bridge-lesson-page {
  --bridge-accent: #f28b22;
  --bridge-soft: #fff7ec;
  padding-bottom: 20px;
}
.bridge-lesson-page.course-e2k {
  --bridge-accent: #245cff;
  --bridge-soft: #eef2ff;
}
.bridge-lesson-page.course-e2kx {
  --bridge-accent: #245cff;
  --bridge-soft: #eef2ff;
}
.bridge-lesson-page.course-k2j {
  --bridge-accent: #f28b22;
  --bridge-soft: #fff7ec;
}
.bridge-lesson-page.course-k2c {
  --bridge-accent: #ef3b1f;
  --bridge-soft: #fff0eb;
}
.bridge-lesson-page.course-j2k {
  --bridge-accent: #178a83;
  --bridge-soft: #eaf8f6;
}
.bridge-lesson-page.course-c2k {
  --bridge-accent: #245cff;
  --bridge-soft: #eef2ff;
}
.bridge-lesson-page .lesson-title { padding: 58px 0 38px; }
.bridge-lesson-page .lesson-title h1 {
  margin: 22px 0;
  max-width: 980px;
  font-size: clamp(27px, 3.2vw, 43px);
  line-height: 1.12;
  letter-spacing: -.05em;
}
.bridge-lesson-page .lesson-title > p:not(.eyebrow) {
  max-width: 820px;
  font-size: 19px;
  line-height: 1.7;
}
.bridge-lesson-page .lesson-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 32px;
}
.bridge-lesson-page .lesson-links a {
  padding: 10px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
}
.bridge-lesson-page .lesson-links a:hover,
.bridge-lesson-page .lesson-links a:focus-visible {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--white);
}
.bridge-lesson-page .step-nav {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--ink);
  background: var(--cream);
}
.bridge-lesson-page .step-nav a {
  min-height: 86px;
  padding: 16px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
}
.bridge-lesson-page .step-nav a:nth-child(4n) { border-right: 0; }
.bridge-lesson-page .step-nav a:nth-child(n+5) { border-bottom: 0; }
.bridge-lesson-page .step-nav a:hover,
.bridge-lesson-page .step-nav a:focus-visible { background: var(--bridge-soft); }
.bridge-lesson-page .step-nav span {
  display: block;
  margin-bottom: 5px;
  color: var(--bridge-accent);
  font-family: Georgia, serif;
  font-size: 26px;
}
.bridge-lesson-page .lesson-content {
  display: grid;
  gap: 22px;
  margin-top: 48px;
  min-width: 0;
}
.bridge-lesson-page .lesson-block {
  scroll-margin-top: 110px;
  border: 1px solid var(--line);
  background: var(--cream);
  padding: 42px;
  min-width: 0;
}
.bridge-lesson-page .lesson-block > * { min-width: 0; }
.bridge-lesson-page .content-table-wrap { max-width: 100%; }
.bridge-lesson-page .lesson-block h2 {
  margin: 14px 0 22px;
  font-size: clamp(27px, 3.2vw, 43px);
  line-height: 1.25;
  letter-spacing: -.035em;
}
.bridge-lesson-page .lesson-block > p:not(.eyebrow) {
  font-size: 17px;
  line-height: 1.8;
}
.bridge-lesson-page .feature-block {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 35px;
}
.bridge-lesson-page .note-box {
  border-left: 6px solid var(--bridge-accent);
  background: var(--bridge-soft);
  padding: 18px;
  line-height: 1.7;
}
.bridge-lesson-page .content-entry {
  margin: 0;
  padding: 20px;
  border-top: 1px solid var(--line);
  line-height: 1.7;
}
.bridge-lesson-page .content-entry p { margin: 6px 0; }
.bridge-lesson-page .content-entry h3 { font-size: 22px; }
.bridge-lesson-page .entry-ko { font-size: 20px; font-weight: 800; }
.bridge-lesson-page .entry-en { font-family: Georgia, serif; font-size: 19px; }
.bridge-lesson-page .error-line { color: #92362e; }
.bridge-lesson-page .repair-line { color: #126e68; font-weight: 800; }
.bridge-lesson-page .choice-line { padding: 12px; background: #eee9df; }
.bridge-lesson-page .assembly {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0;
}
.bridge-lesson-page .assembly span {
  padding: 14px 18px;
  background: var(--bridge-accent);
  color: var(--ink);
  font-weight: 800;
}
.bridge-lesson-page.course-e2k .assembly span { color: var(--white); }
.bridge-lesson-page.course-e2kx .assembly span { color: var(--white); }
.bridge-lesson-page .dialogue {
  max-width: 800px;
  padding: 28px;
  background: var(--ink);
  color: var(--white);
}
.bridge-lesson-page .dialogue p { line-height: 1.6; }
.bridge-lesson-page .dialogue b {
  display: inline-block;
  width: 30px;
  color: var(--bridge-accent);
}
.bridge-lesson-page .dialogue span { color: #d6d2c9; }
.bridge-lesson-page .practice-box {
  margin-top: 25px;
  border: 1px solid var(--bridge-accent);
  background: var(--bridge-soft);
  padding: 24px;
  line-height: 1.75;
}
.bridge-lesson-page .writing-line {
  margin: 14px 0;
  padding: 17px;
  border-bottom: 1px solid var(--line);
}
.bridge-lesson-page details {
  margin-top: 25px;
  border: 1px solid var(--line);
  background: var(--white);
  padding: 20px;
}
.bridge-lesson-page summary { cursor: pointer; font-weight: 800; }
.bridge-lesson-page .lesson-block .content-subheading,
.bridge-module-page .resource-section .content-subheading {
  margin: 24px 0 12px;
  font-size: 21px;
  line-height: 1.45;
}
.bridge-lesson-page .lesson-block ul,
.bridge-lesson-page .lesson-block ol,
.bridge-module-page .resource-section ul,
.bridge-module-page .resource-section ol { padding-left: 24px; }
.bridge-lesson-page .lesson-block li,
.bridge-module-page .resource-section li { margin: 8px 0; line-height: 1.75; }
.bridge-lesson-page .lesson-block blockquote,
.bridge-module-page .resource-section blockquote {
  margin: 18px 0;
  padding: 16px 18px;
  border-left: 5px solid var(--bridge-accent);
  background: var(--bridge-soft);
}
.bridge-lesson-page .lesson-block code,
.bridge-module-page .resource-section code {
  padding: 2px 5px;
  border: 1px solid var(--line);
  background: var(--white);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}
.bridge-lesson-page .structured-feature > div:first-child { min-width: 0; }
.bridge-lesson-page .answer-section,
.bridge-module-page .answer-section { margin-top: 0; }

.bridge-module-page {
  --bridge-accent: #f28b22;
  --bridge-soft: #fff7ec;
  padding: 22px 0 18px;
}
.bridge-module-page.course-e2k {
  --bridge-accent: #245cff;
  --bridge-soft: #eef2ff;
}
.bridge-module-page.course-e2kx {
  --bridge-accent: #245cff;
  --bridge-soft: #eef2ff;
}
.bridge-module-page.course-k2j {
  --bridge-accent: #f28b22;
  --bridge-soft: #fff7ec;
}
.bridge-module-page.course-k2c {
  --bridge-accent: #ef3b1f;
  --bridge-soft: #fff0eb;
}
.bridge-module-page.course-j2k {
  --bridge-accent: #178a83;
  --bridge-soft: #eaf8f6;
}
.bridge-module-page.course-c2k {
  --bridge-accent: #245cff;
  --bridge-soft: #eef2ff;
}
.bridge-module-heading { padding: 18px 0 26px; }
.bridge-module-heading h1 {
  margin: 20px 0 12px;
  max-width: 1040px;
  font-size: clamp(27px, 3.4vw, 43px);
  line-height: 1.12;
  letter-spacing: -.05em;
}
.bridge-module-heading > p:not(.eyebrow) {
  max-width: 900px;
  font-size: 19px;
  line-height: 1.8;
}
.bridge-module-page .resource-tabs {
  position: sticky;
  top: 69px;
  z-index: 5;
  display: grid;
  grid-template-columns: repeat(var(--resource-columns, 7), minmax(0, 1fr));
  margin: 18px 0 25px;
  border: 1px solid var(--ink);
  background: rgba(250, 247, 240, .97);
}
.bridge-module-page .resource-tabs a {
  min-width: 0;
  padding: 16px 14px;
  border-right: 1px solid var(--line);
  text-decoration: none;
  font-size: 12px;
  font-weight: 850;
  line-height: 1.45;
}
.bridge-module-page .resource-tabs a:last-child { border-right: 0; }
.bridge-module-page .resource-tabs a:hover,
.bridge-module-page .resource-tabs a:focus-visible { background: var(--bridge-soft); }
.bridge-module-page .resource-tabs span {
  margin-right: 7px;
  color: var(--bridge-accent);
}
.bridge-module-page .resource-section {
  scroll-margin-top: 150px;
  margin: 18px 0;
  border: 1px solid var(--line);
  background: var(--cream);
  padding: 38px;
}
.bridge-module-page .resource-section h2 {
  margin: 15px 0 25px;
  font-size: clamp(27px, 3.4vw, 43px);
  line-height: 1.3;
  letter-spacing: -.035em;
}
.bridge-module-page .resource-section > p:not(.eyebrow) {
  font-size: 17px;
  line-height: 1.8;
}
.bridge-module-page .content-entry {
  padding: 20px;
  border-top: 1px solid var(--line);
  line-height: 1.7;
}
.bridge-module-page .content-entry p { margin: 6px 0; }
.bridge-module-page .content-entry h3 { margin: 5px 0 12px; font-size: 21px; }
.bridge-module-page .entry-ko { font-size: 20px; font-weight: 800; }
.bridge-module-page .entry-en { font-family: Georgia, serif; font-size: 19px; }
.bridge-module-page .choice-line { padding: 12px; background: #eee9df; }
.bridge-module-page .error-line { color: #92362e; }
.bridge-module-page .repair-line { color: #126e68; font-weight: 800; }
.bridge-module-page .dialogue {
  max-width: 800px;
  margin-top: 8px;
  padding: 28px;
  background: var(--ink);
  color: var(--white);
}
.bridge-module-page .dialogue p { margin: 7px 0; line-height: 1.6; }
.bridge-module-page .practice-box {
  margin-top: 25px;
  border: 1px solid var(--bridge-accent);
  background: var(--bridge-soft);
  padding: 24px;
  line-height: 1.75;
}
.bridge-module-page .note-box {
  margin-top: 25px;
  border-left: 6px solid var(--bridge-accent);
  background: var(--bridge-soft);
  padding: 18px;
  line-height: 1.7;
}
.bridge-module-page details {
  margin-top: 25px;
  border: 1px solid var(--line);
  background: var(--white);
  padding: 20px;
}
.bridge-module-page summary { cursor: pointer; font-weight: 800; }
.bridge-module-links {
  position: sticky;
  bottom: 12px;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 35px;
  padding: 10px;
  background: rgba(21, 21, 18, .96);
}
.bridge-module-links a {
  padding: 10px 14px;
  color: var(--white);
  text-decoration: none;
  font-size: 12px;
  font-weight: 850;
}
.bridge-module-links a:hover,
.bridge-module-links a:focus-visible,
.bridge-module-links a[aria-current="page"] { color: var(--bridge-accent, #f28b22); }

.site-footer { padding: 34px 0 54px; color: var(--muted); font-size: 13px; }
.site-footer-main { display: flex; justify-content: space-between; gap: 24px; }
.site-footer a { color: var(--ink); font-weight: 900; text-decoration: none; }
.legal-site-notice { margin: 24px 0 0; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; line-height: 1.7; text-align: center; }
.loading { padding: 80px 24px; text-align: center; }

@media (max-width: 820px) {
  .shell { width: min(100% - 28px, 1180px); }
  .header-inner { display: grid; grid-template-columns: 1fr; align-items: start; gap: 7px; padding: 12px 0; }
  .brand { white-space: nowrap; }
  .main-nav { width: auto; gap: 18px; flex-wrap: wrap; justify-content: flex-start; }
  .main-nav a { white-space: nowrap; }
  .brand span { display: inline; font-size: 15px; }
  .status-pill { display: none; }
  .hero { padding: 64px 0; }
  .hero-grid, .section-heading { grid-template-columns: 1fr; gap: 28px; }
  .principle-lead, .about-copy-grid { margin-left: 0; }
  .method-steps article:nth-child(n) { width: 100%; margin-left: 0; }
  .about-hero-grid, .about-copy-grid { grid-template-columns: 1fr; }
  .process-track { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .process-track article:nth-child(2) { border-right: 0; }
  .process-track article:nth-child(-n+2) { border-bottom: 1px solid #4b4b46; }
  .path-grid, .module-grid, .future-grid, .course-grid, .steps-grid, .demo-grid { grid-template-columns: 1fr; }
  .demo-arrow { transform: rotate(90deg); justify-self: center; }
  .steps-grid article { border-right: 0; border-bottom: 1px solid var(--line); }
  .steps-grid article:last-child { border-bottom: 0; }
  .path-card + .path-card { border-left: 0; border-top: 1px solid var(--ink); }
  .module-card, .module-card:nth-child(3n) { border-right: 0; border-bottom: 1px solid var(--line); }
  .module-grid.four .module-card, .module-grid.four .module-card:nth-child(3n) { border-right: 0; border-bottom: 1px solid var(--line); }
  .module-grid.four .module-card:last-child { border-bottom: 0; }
  .module-card:last-child { border-bottom: 0; }
  .lesson-row { grid-template-columns: 54px 1fr; }
  .lesson-row > a { grid-column: 2; }
  .resource-row .row-actions { grid-column: 2; }
  .section-nav { top: 112px; }
  .lesson-pagination { grid-template-columns: 1fr; }
  .lesson-pagination a.next { text-align: left; }
  .bridge-lesson-page .step-nav { display: flex; overflow-x: auto; }
  .bridge-lesson-page .step-nav a { min-width: 190px; border-bottom: 0; }
  .bridge-lesson-page .step-nav a:nth-child(4n) { border-right: 1px solid var(--line); }
  .bridge-lesson-page .step-nav a:last-child { border-right: 0; }
  .bridge-lesson-page .feature-block { grid-template-columns: 1fr; }
  .bridge-lesson-page .lesson-block { padding: 26px; }
  .bridge-module-page .resource-tabs {
    top: 112px;
    display: flex;
    overflow-x: auto;
  }
  .bridge-module-page .resource-tabs a { flex: 0 0 auto; min-width: 165px; }
  .bridge-module-page .resource-section { padding: 26px; }
  .bridge-module-links { flex-wrap: nowrap; overflow-x: auto; }
  .bridge-module-links a { flex: 0 0 auto; white-space: nowrap; }
  .site-footer-main { flex-direction: column; }
}

@media (max-width: 560px) {
  .about-process, .about-finale { padding: 64px 0; }
  .method-steps article { grid-template-columns: 1fr; padding: 20px; }
  .method-steps span { grid-row: auto; }
  .process-track { grid-template-columns: 1fr; }
  .process-track article { min-height: 0; border-right: 0; border-bottom: 1px solid #4b4b46; }
  .process-track article:nth-child(-n+3) { border-bottom: 1px solid #4b4b46; }
  .process-track article:last-child { border-bottom: 0; }
  .contrast-grid > div { padding: 16px 14px; font-size: 14px; }
  .contrast-grid .contrast-head { font-size: 15px; }
  .about-intro blockquote { padding: 26px 24px; }
}


/* k2e-e2k.com curriculum bridge */
:root{--k2ee2k-ink:#151512;--k2ee2k-paper:#f4f0e7;--k2ee2k-paper2:#fbf8f1;--k2ee2k-line:#c9c2b7;--k2ee2k-accent:#ef3d19}
body.verb-slots{background:var(--k2ee2k-paper);color:var(--k2ee2k-ink)}
.k2e-e2k-header{position:sticky;top:0;z-index:30;border-bottom:4px solid var(--k2ee2k-accent);background:rgba(244,240,231,.95);backdrop-filter:blur(12px)}
.k2e-e2k-header .header-inner{min-height:82px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.k2e-e2k-header .brand{display:flex;align-items:baseline;gap:12px}.k2e-e2k-header .brand strong{font-size:25px;letter-spacing:-1px}.k2e-e2k-header .brand span{font-family:Georgia,"Times New Roman",serif;font-size:18px}
.k2e-e2k-header .main-nav{display:flex;gap:22px;align-items:center;font-size:14px;font-weight:700}.k2e-e2k-header .main-nav a:hover{text-decoration:underline;text-underline-offset:5px}
.k2e-e2k-header .header-course-actions{display:flex;align-items:center;gap:8px}.k2e-e2k-header .curriculum-pill,.k2e-e2k-header .course-switch{padding:9px 13px;border:1px solid var(--k2ee2k-ink);border-radius:999px;font-size:12px;font-weight:900;white-space:nowrap}
.verb-slots .course-nav{border-color:var(--k2ee2k-ink);background:var(--k2ee2k-paper2)}
.verb-slots .course-nav a.active,.verb-slots .step-nav span{color:var(--k2ee2k-accent)}
.verb-slots .lesson-block,.verb-slots .resource-section{background:var(--k2ee2k-paper2)}
.verb-slots .lesson-title h1{font-size:clamp(42px,6vw,74px)}
.verb-slots .pattern-card{border-top:7px solid var(--k2ee2k-accent)}
.verb-slots .assembly span{background:var(--k2ee2k-accent);color:white}
.verb-slots .lesson-links a:hover,.verb-slots .bridge-module-links a[aria-current="page"]{background:var(--k2ee2k-accent);color:white}
@media(max-width:900px){.k2e-e2k-header .main-nav{display:none}.k2e-e2k-header .brand span{display:none}.k2e-e2k-header .header-course-actions{margin-left:auto}}
@media(max-width:560px){.k2e-e2k-header .curriculum-pill{display:none}.k2e-e2k-header .header-inner{min-height:68px}}