:root {
  --ink: #101015;
  --paper: #f5f2ea;
  --blue: #3557ff;
  --lime: #d9ff43;
  --orange: #ff6b31;
  --line: rgba(16, 16, 21, 0.18);
  --muted: #6f706f;
  --white: #fffefa;
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.45;
  overflow-x: hidden;
}
button, input, textarea, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
button { color: inherit; }

.shell { width: min(1440px, 100%); margin: 0 auto; padding-inline: 32px; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(18px);
}
.header-inner { min-height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 900; letter-spacing: -0.045em; font-size: 24px; }
.brand-mark { width: 17px; height: 17px; border-radius: 50%; background: var(--blue); box-shadow: 10px 0 0 var(--lime); }
.case-back { min-width: 184px; min-height: 44px; padding: 0 24px; border: 1px solid var(--line); border-radius: 999px; background: color-mix(in srgb, var(--white) 70%, transparent); display: inline-flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 900; letter-spacing: .08em; transition: background .22s ease, color .22s ease, border-color .22s ease, transform .22s ease; }
.case-back:hover { background: var(--ink); border-color: var(--ink); color: var(--white); transform: translateY(-2px); }
.lang-switch { display: flex; padding: 4px; border: 1px solid var(--line); border-radius: 999px; background: var(--white); }
.lang-switch button { min-width: 42px; height: 34px; border: 0; border-radius: 999px; background: transparent; cursor: pointer; font-size: 13px; font-weight: 800; }
.lang-switch button.active { background: var(--ink); color: var(--white); }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 12px; border: 1px solid var(--ink); border-radius: 999px; padding: 0 22px; background: transparent; font-weight: 800; cursor: pointer; transition: transform .2s ease, background .2s ease, color .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-dark { background: var(--ink); color: var(--white); }
.button-blue { background: var(--blue); border-color: var(--blue); color: white; }
.button-lime { background: var(--lime); color: var(--ink); }
.button-small { min-height: 40px; padding-inline: 17px; font-size: 14px; }
.arrow { font-size: 20px; line-height: 1; }

.case-hero { padding: 54px 0 68px; border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.03fr) minmax(420px, .97fr); gap: 56px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; text-transform: uppercase; letter-spacing: .14em; font-weight: 800; font-size: 12px; }
.eyebrow::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--orange); }
.hero-title { max-width: 860px; margin: 26px 0 24px; font-size: clamp(62px, 7.4vw, 118px); line-height: .88; letter-spacing: -.075em; font-weight: 900; text-transform: uppercase; }
.hero-title .outline { display: block; color: transparent; -webkit-text-stroke: 2px var(--ink); }
.hero-copy { max-width: 650px; font-size: clamp(18px, 1.45vw, 23px); line-height: 1.42; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.case-view-link { min-height: 48px; display: inline-flex; align-items: center; border-bottom: 1px solid var(--ink); font-weight: 800; transition: color .2s ease, border-color .2s ease, transform .2s ease; }
.case-view-link:hover { color: var(--blue); border-color: var(--blue); transform: translateY(-2px); }

.learning-board { min-height: 610px; position: relative; border-radius: 36px; background: var(--blue); color: white; padding: 26px; overflow: hidden; box-shadow: 0 34px 70px rgba(53, 87, 255, .24); }
.learning-board::after { content: ""; position: absolute; width: 280px; height: 280px; border: 48px solid var(--lime); border-radius: 50%; right: -100px; bottom: -86px; opacity: .95; }
.board-top { display: flex; justify-content: space-between; align-items: center; font-size: 13px; font-weight: 800; }
.board-dots { display: flex; gap: 6px; }
.board-dots i { display: block; width: 8px; height: 8px; border-radius: 50%; background: rgba(255,255,255,.5); }
.board-dots i:first-child { background: var(--lime); }
.board-headline { margin: 64px 0 32px; max-width: 500px; font-size: clamp(46px, 4vw, 68px); line-height: .95; letter-spacing: -.055em; font-weight: 900; }
.board-progress { width: 100%; height: 8px; background: rgba(255,255,255,.2); border-radius: 99px; overflow: hidden; }
.board-progress span { display: block; width: 68%; height: 100%; background: var(--lime); }
.board-cards { position: absolute; left: 26px; right: 26px; bottom: 28px; z-index: 2; display: grid; grid-template-columns: 1.18fr .82fr; gap: 12px; }
.board-card { min-height: 145px; border-radius: 20px; padding: 20px; background: var(--white); color: var(--ink); display: flex; flex-direction: column; justify-content: space-between; }
.board-card.orange { background: var(--orange); }
.board-card b { max-width: 220px; font-size: 22px; line-height: 1.05; letter-spacing: -.035em; }
.board-card span { font-size: 13px; color: rgba(16,16,21,.65); }

.stat-strip { display: grid; grid-template-columns: repeat(4, 1fr); border-bottom: 1px solid var(--line); }
.stat { padding: 28px 32px; border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat strong { display: block; font-size: clamp(36px, 4vw, 64px); line-height: 1; letter-spacing: -.055em; }
.stat span { display: block; margin-top: 8px; color: var(--muted); }

.case-section { padding: 100px 0; border-bottom: 1px solid var(--line); }
.section-grid { display: grid; grid-template-columns: .34fr .66fr; gap: 60px; }
.section-index { color: var(--blue); font-size: 13px; font-weight: 900; letter-spacing: .12em; }
.section-title { max-width: 960px; margin: 0; font-size: clamp(42px, 5.3vw, 82px); line-height: .98; letter-spacing: -.06em; text-transform: uppercase; }
.section-lead { max-width: 790px; margin: 30px 0 0; font-size: clamp(18px, 1.6vw, 24px); color: #4b4c4c; }
.challenge-grid { margin-top: 60px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.challenge-card { min-height: 260px; display: flex; flex-direction: column; justify-content: space-between; padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.challenge-card:nth-child(2) { background: var(--lime); }
.challenge-card:nth-child(3) { background: var(--ink); color: var(--white); }
.challenge-card small { font-weight: 900; }
.challenge-card h3 { margin: 0; font-size: 27px; line-height: 1.05; letter-spacing: -.04em; }
.challenge-card p { margin: 14px 0 0; color: inherit; opacity: .72; }

.journey { margin-top: 62px; display: grid; grid-template-columns: repeat(5, 1fr); border-top: 1px solid var(--ink); }
.journey-step { min-height: 210px; padding: 20px 18px; border-right: 1px solid var(--line); }
.journey-step:last-child { border-right: 0; }
.journey-step b { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: var(--blue); color: white; }
.journey-step h3 { margin: 28px 0 8px; font-size: 20px; letter-spacing: -.025em; }
.journey-step p { margin: 0; font-size: 14px; color: var(--muted); }

.screen-stage { margin-top: 66px; padding: 24px; border-radius: 34px; background: var(--ink); }
.screen-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 18px; }
.screen { min-height: 520px; border-radius: 22px; padding: 26px; background: var(--paper); overflow: hidden; }
.screen.blue { background: var(--blue); color: white; }
.screen-bar { display: flex; justify-content: space-between; align-items: center; font-weight: 900; }
.screen-course { margin-top: 72px; padding: 24px; border-radius: 20px; background: var(--white); color: var(--ink); }
.screen-course em { display: inline-flex; padding: 6px 10px; border-radius: 99px; background: var(--lime); font-size: 12px; font-style: normal; font-weight: 800; }
.screen-course h3 { margin: 20px 0 46px; max-width: 420px; font-size: 44px; line-height: .95; letter-spacing: -.055em; }
.lesson-ui { margin-top: 46px; display: grid; grid-template-columns: 145px 1fr; gap: 18px; }
.lesson-list { display: flex; flex-direction: column; gap: 8px; }
.lesson-list span { padding: 12px; border-radius: 12px; border: 1px solid rgba(255,255,255,.25); font-size: 13px; }
.lesson-list span.active { background: var(--lime); color: var(--ink); border-color: var(--lime); }
.lesson-video { min-height: 300px; border-radius: 18px; background: linear-gradient(135deg, #171722, #313244); display: grid; place-items: center; }
.play { display: grid; place-items: center; width: 76px; height: 76px; border-radius: 50%; background: var(--orange); font-size: 25px; }

.palette { margin-top: 56px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.swatch { min-height: 240px; border-radius: 24px; padding: 20px; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid var(--line); }
.swatch:nth-child(1) { background: var(--blue); color: white; }
.swatch:nth-child(2) { background: var(--lime); }
.swatch:nth-child(3) { background: var(--orange); }
.swatch:nth-child(4) { background: var(--ink); color: white; }
.swatch strong { font-size: 22px; }

.delivery-grid { margin-top: 58px; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.delivery-card { min-height: 300px; display: flex; flex-direction: column; justify-content: space-between; padding: 28px; border: 1px solid var(--line); border-radius: 28px; background: var(--white); }
.delivery-card-blue { background: var(--blue); color: white; }
.delivery-card-lime { background: var(--lime); }
.delivery-card-orange { background: var(--orange); }
.delivery-number { display: grid; place-items: center; width: 46px; height: 46px; border: 1px solid currentColor; border-radius: 50%; font-size: 13px; font-weight: 900; }
.delivery-card h3 { max-width: 410px; margin: 0; font-size: clamp(28px, 3vw, 44px); line-height: .95; letter-spacing: -.05em; text-transform: uppercase; }
.delivery-card p { max-width: 510px; margin: 18px 0 0; color: inherit; opacity: .74; }

.roles-section { background: var(--ink); color: var(--white); }
.roles-section .section-index { color: var(--lime); }
.roles-section .section-lead { color: rgba(255,255,255,.64); }
.role-grid { margin-top: 60px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.role-card { min-height: 590px; padding: 24px; display: flex; flex-direction: column; border-radius: 28px; background: var(--paper); color: var(--ink); overflow: hidden; }
.role-student { background: var(--blue); color: white; }
.role-teacher { background: var(--lime); }
.role-admin { background: var(--orange); }
.role-head { display: flex; align-items: center; justify-content: space-between; gap: 20px; text-transform: uppercase; font-size: 13px; font-weight: 900; letter-spacing: .08em; }
.role-ui { min-height: 300px; margin: 70px 0 28px; padding: 18px; border-radius: 22px; background: var(--white); color: var(--ink); box-shadow: 0 28px 55px rgba(16,16,21,.16); transform: rotate(-2deg); }
.role-teacher .role-ui { transform: rotate(2deg); }
.role-admin .role-ui { transform: rotate(-1deg); }
.role-progress span { display: block; margin-bottom: 13px; font-size: 54px; line-height: 1; font-weight: 900; letter-spacing: -.06em; }
.role-progress i { display: block; height: 10px; border-radius: 99px; background: #e7e7e2; overflow: hidden; }
.role-progress b { display: block; width: 68%; height: 100%; border-radius: inherit; background: var(--blue); }
.role-row { min-height: 58px; margin-top: 12px; padding: 12px 14px; display: flex; align-items: center; justify-content: space-between; gap: 18px; border-radius: 14px; background: #f1f1ed; font-size: 13px; }
.role-row strong { font-size: 16px; }
.lesson-blocks { margin: 28px 0 22px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; }
.lesson-blocks i { height: 82px; border-radius: 12px; background: #e8e8e3; }
.lesson-blocks i.active { background: var(--blue); transform: translateY(-10px); }
.admin-chart { height: 160px; display: flex; align-items: end; gap: 9px; padding: 20px 8px 12px; }
.admin-chart i { flex: 1; height: 36%; border-radius: 8px 8px 3px 3px; background: var(--blue); }
.admin-chart i:nth-child(2) { height: 54%; }
.admin-chart i:nth-child(3) { height: 42%; }
.admin-chart i:nth-child(4) { height: 78%; background: var(--orange); }
.admin-chart i:nth-child(5) { height: 96%; background: var(--lime); }
.role-card > p { margin: auto 0 0; font-size: 17px; color: inherit; opacity: .75; }

.interface-section { background: #e9e8e2; }
.interface-grid { margin-top: 58px; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.interface-card { min-height: 330px; padding: 24px; border: 1px solid var(--line); border-radius: 26px; background: var(--white); overflow: hidden; }
.interface-wide { grid-column: 1 / -1; min-height: 430px; background: var(--blue); color: white; }
.interface-access { grid-column: 1 / -1; min-height: 250px; background: var(--ink); color: white; }
.interface-top { display: flex; align-items: center; justify-content: space-between; gap: 20px; font-size: 13px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.interface-top b { display: inline-flex; align-items: center; justify-content: center; min-width: 46px; height: 30px; padding-inline: 10px; border-radius: 99px; background: var(--lime); color: var(--ink); font-size: 11px; }
.metric-grid { margin-top: 50px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.metric-grid > div { min-height: 130px; padding: 18px; display: flex; flex-direction: column; border-radius: 18px; background: rgba(255,255,255,.12); }
.metric-grid small { color: rgba(255,255,255,.65); }
.metric-grid strong { margin-top: 15px; font-size: clamp(31px, 4vw, 55px); line-height: 1; letter-spacing: -.06em; }
.metric-grid em { margin-top: auto; color: var(--lime); font-style: normal; font-weight: 900; }
.analytics-chart { height: 120px; margin-top: 18px; display: flex; align-items: end; gap: 8px; }
.analytics-chart i { flex: 1; height: 30%; border-radius: 10px 10px 2px 2px; background: rgba(255,255,255,.3); }
.analytics-chart i:nth-child(2) { height: 46%; }.analytics-chart i:nth-child(3) { height: 40%; }.analytics-chart i:nth-child(4) { height: 68%; }.analytics-chart i:nth-child(5) { height: 56%; }.analytics-chart i:nth-child(6) { height: 82%; }.analytics-chart i:nth-child(7) { height: 74%; }.analytics-chart i:nth-child(8) { height: 100%; background: var(--lime); }
.submission { margin-top: 20px; min-height: 82px; padding: 14px; display: grid; grid-template-columns: 48px 1fr auto; align-items: center; gap: 12px; border-radius: 16px; background: var(--paper); }
.submission > span { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 50%; background: var(--orange); font-size: 12px; font-weight: 900; }
.submission div { display: flex; flex-direction: column; }
.submission small { color: var(--muted); }
.builder-list { margin-top: 26px; display: flex; flex-direction: column; gap: 9px; }
.builder-list div { min-height: 58px; padding: 12px; display: grid; grid-template-columns: 34px 1fr auto; align-items: center; border: 1px solid var(--line); border-radius: 14px; }
.builder-list div.active { background: var(--lime); }
.builder-list span { color: var(--muted); font-size: 12px; }
.builder-list i { font-style: normal; }
.access-row { min-height: 70px; margin-top: 12px; padding: 12px 0; display: grid; grid-template-columns: 90px 1fr auto; align-items: center; gap: 20px; border-bottom: 1px solid rgba(255,255,255,.18); }
.access-row:first-of-type { margin-top: 34px; }
.access-row > span { color: rgba(255,255,255,.5); }
.access-row em { padding: 7px 11px; border-radius: 99px; background: var(--lime); color: var(--ink); font-size: 12px; font-style: normal; font-weight: 900; }

.launch-section { background: var(--orange); }
.launch-section .section-index { color: var(--ink); }
.launch-strip { margin-top: 58px; display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--ink); border-radius: 28px; overflow: hidden; background: rgba(255,255,255,.14); }
.launch-strip div { min-height: 210px; padding: 24px; display: flex; flex-direction: column; justify-content: space-between; border-right: 1px solid var(--ink); }
.launch-strip div:last-child { border-right: 0; }
.launch-strip strong { font-size: clamp(50px, 6vw, 86px); line-height: 1; letter-spacing: -.07em; }
.launch-strip span { max-width: 150px; text-transform: uppercase; font-size: 12px; font-weight: 900; letter-spacing: .05em; }

.demo-case-section { background: var(--ink); color: var(--white); }
.demo-case-section .section-index { color: var(--lime); }
.demo-case-card { display: grid; grid-template-columns: 1fr .82fr; gap: 46px; min-height: 560px; padding: 48px; border: 1px solid rgba(255,255,255,.16); border-radius: 36px; background: linear-gradient(135deg, #1c31a4 0%, var(--blue) 62%, #2241d8 100%); overflow: hidden; }
.demo-case-copy { display: flex; flex-direction: column; align-items: flex-start; justify-content: center; position: relative; z-index: 2; }
.demo-case-kicker { margin-bottom: 24px; color: var(--lime); font-size: 12px; font-weight: 900; letter-spacing: .14em; }
.demo-case-copy h2 { max-width: 680px; margin: 0; font-size: clamp(44px, 5.5vw, 82px); line-height: .92; letter-spacing: -.065em; text-transform: uppercase; }
.demo-case-copy p { max-width: 670px; margin: 26px 0 32px; color: rgba(255,255,255,.75); font-size: clamp(17px, 1.5vw, 22px); }
.demo-case-copy .button { border-color: var(--lime); color: var(--ink); }
.demo-case-preview { align-self: center; min-height: 430px; padding: 26px; border-radius: 30px; background: var(--paper); color: var(--ink); transform: rotate(2deg); box-shadow: 0 32px 76px rgba(9,12,35,.28); }
.demo-preview-bar { display: flex; justify-content: space-between; align-items: center; padding-bottom: 22px; border-bottom: 1px solid var(--line); font-size: 13px; }
.demo-preview-main { min-height: 248px; margin-top: 18px; padding: 28px; border-radius: 22px; background: var(--ink); color: var(--white); display: flex; flex-direction: column; justify-content: flex-end; }
.demo-preview-main > span { color: rgba(255,255,255,.58); font-size: 13px; }
.demo-preview-main > strong { max-width: 430px; margin-top: 12px; font-size: clamp(26px, 2.7vw, 42px); line-height: 1; letter-spacing: -.045em; }
.demo-preview-main i { display: block; height: 7px; margin-top: 30px; border-radius: 99px; background: rgba(255,255,255,.2); overflow: hidden; }
.demo-preview-main i b { display: block; width: 68%; height: 100%; border-radius: inherit; background: var(--lime); }
.demo-preview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 14px; }
.demo-preview-grid span { display: grid; place-items: center; min-height: 66px; border-radius: 16px; background: var(--white); font-weight: 900; }
.demo-preview-grid span:nth-child(2) { background: var(--orange); }
.demo-preview-grid span:nth-child(3) { background: var(--lime); }

.faq-section { background: var(--paper); }
.faq-list { margin-top: 56px; border-top: 1px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 24px 0; cursor: pointer; font-size: clamp(18px, 1.8vw, 25px); font-weight: 800; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary b { font-size: 28px; font-weight: 400; transition: transform .25s ease; }
.faq-list details[open] summary b { transform: rotate(45deg); }
.faq-list details p { max-width: 760px; margin: 0; padding: 0 54px 26px 0; color: var(--muted); font-size: 16px; }

.case-cta { padding: 76px 0; background: var(--lime); }
.case-cta-inner { display: flex; align-items: flex-end; justify-content: space-between; gap: 30px; }
.case-cta h2 { max-width: 930px; margin: 0; font-size: clamp(48px, 7vw, 104px); line-height: .9; letter-spacing: -.07em; text-transform: uppercase; }
.cta-kicker { display: block; margin-bottom: 30px; font-size: 12px; font-weight: 900; letter-spacing: .14em; }
.cta-actions { display: flex; flex-direction: column; align-items: stretch; gap: 10px; flex: 0 0 240px; }
.footer { padding: 28px 0; background: var(--ink); color: var(--white); }
.footer-inner { display: flex; justify-content: space-between; gap: 20px; font-size: 13px; }

.modal { position: fixed; inset: 0; z-index: 80; display: none; place-items: center; padding: 20px; }
.modal.open { display: grid; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(10,10,15,.72); backdrop-filter: blur(10px); }
.modal-panel { position: relative; z-index: 1; width: min(760px, 100%); max-height: calc(100vh - 40px); overflow: auto; border-radius: 30px; padding: 34px; background: var(--paper); box-shadow: 0 30px 90px rgba(0,0,0,.3); }
.modal-close { position: absolute; top: 18px; right: 18px; width: 42px; height: 42px; border: 1px solid var(--ink); border-radius: 50%; background: transparent; cursor: pointer; }
.modal-kicker { display: block; color: var(--blue); font-size: 12px; font-weight: 900; letter-spacing: .14em; }
.modal h2 { max-width: 590px; margin: 24px 0 14px; font-size: clamp(42px, 6vw, 72px); line-height: .92; letter-spacing: -.06em; text-transform: uppercase; }
.modal p { color: #555658; }
.contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 28px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field.full { grid-column: 1 / -1; }
.field span { font-size: 12px; font-weight: 900; letter-spacing: .08em; }
.field input, .field textarea, .field select { width: 100%; border: 1px solid var(--line); border-radius: 15px; padding: 14px 15px; background: var(--white); color: var(--ink); }
.field textarea { resize: vertical; min-height: 112px; }
.success { display: none; padding: 50px 0 20px; text-align: center; }
.success.show { display: block; }
.success-mark { display: grid; place-items: center; width: 92px; height: 92px; margin: 0 auto 26px; border-radius: 50%; background: var(--lime); font-size: 36px; }
.no-scroll { overflow: hidden; }

@media (max-width: 980px) {
  .shell { padding-inline: 20px; }
  .hero-grid, .section-grid, .screen-grid { grid-template-columns: 1fr; }
  .learning-board { min-height: 540px; }
  .section-grid { gap: 26px; }
  .challenge-grid { grid-template-columns: 1fr; }
  .challenge-card { min-height: 210px; }
  .role-grid { grid-template-columns: 1fr; }
  .role-card { min-height: 520px; }
  .role-ui { margin-top: 42px; }
  .launch-strip { grid-template-columns: 1fr 1fr; }
  .launch-strip div:nth-child(2) { border-right: 0; }
  .launch-strip div:nth-child(-n+2) { border-bottom: 1px solid var(--ink); }
  .demo-case-card { grid-template-columns: 1fr; }
  .demo-case-preview { width: 100%; }
  .journey { grid-template-columns: 1fr 1fr; }
  .journey-step { border-bottom: 1px solid var(--line); }
  .stat-strip { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .case-cta-inner { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 680px) {
  .header-inner { min-height: 68px; gap: 12px; }
  .case-back { min-width: 142px; min-height: 40px; padding: 0 16px; font-size: 10px; }
  .lang-switch button { min-width: 36px; height: 32px; }
  .case-hero { padding-top: 34px; }
  .hero-title { font-size: clamp(54px, 20vw, 82px); }
  .learning-board { min-height: 510px; border-radius: 26px; padding: 20px; }
  .board-headline { margin-top: 52px; }
  .board-cards { left: 20px; right: 20px; bottom: 20px; grid-template-columns: 1fr; }
  .board-card:last-child { display: none; }
  .stat { padding: 22px 20px; }
  .case-section { padding: 72px 0; }
  .journey { grid-template-columns: 1fr; }
  .journey-step { min-height: auto; border-right: 0; }
  .screen-stage { padding: 10px; margin-inline: -10px; }
  .screen { min-height: 440px; padding: 18px; }
  .screen-course h3 { font-size: 34px; }
  .lesson-ui { grid-template-columns: 1fr; }
  .lesson-list { display: none; }
  .palette { grid-template-columns: 1fr 1fr; }
  .swatch { min-height: 170px; }
  .delivery-grid, .interface-grid { grid-template-columns: 1fr; }
  .interface-wide, .interface-access { grid-column: auto; }
  .metric-grid { grid-template-columns: 1fr; }
  .metric-grid > div { min-height: 112px; }
  .interface-wide { min-height: auto; }
  .access-row { grid-template-columns: 74px 1fr; }
  .access-row em { grid-column: 2; width: fit-content; }
  .launch-strip { grid-template-columns: 1fr; }
  .launch-strip div { min-height: 150px; border-right: 0; border-bottom: 1px solid var(--ink); }
  .launch-strip div:nth-child(2) { border-right: 0; }
  .launch-strip div:last-child { border-bottom: 0; }
  .demo-case-card { min-height: 0; padding: 24px; border-radius: 26px; gap: 28px; }
  .demo-case-copy h2 { font-size: 42px; }
  .demo-case-preview { min-height: 0; padding: 16px; border-radius: 22px; transform: none; }
  .demo-preview-main { min-height: 220px; padding: 20px; }
  .faq-list summary { padding: 20px 0; }
  .faq-list details p { padding-right: 20px; }
  .cta-actions { width: 100%; flex-basis: auto; }
  .cta-actions .button { width: 100%; }
  .footer-inner { flex-direction: column; }
  .contact-form { grid-template-columns: 1fr; }
  .field.full { grid-column: auto; }
  .modal-panel { padding: 28px 20px 22px; border-radius: 24px; }
}