:root {
  --ink: #22222a;
  --ink-soft: #555766;
  --accent: #eb0410;
  --accent-deep: #c2020f;
  --accent-bright: #ff2b34;
  --accent-pale: #ffe5e7;
  --blue: var(--accent-deep);
  --blue-bright: var(--accent-bright);
  --blue-pale: var(--accent-pale);
  --paper: #f7f8f5;
  --white: #ffffff;
  --signal: #ffbd35;
  --signal-soft: #fff0bd;
  --green: #17866f;
  --red: #c74a45;
  --border: rgba(13, 24, 48, 0.14);
  --shadow: 0 24px 80px rgba(13, 24, 48, 0.12);
  --radius: 28px;
  --header: 74px;
  --controls: 76px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  color: var(--ink);
  font-family: "Onest", sans-serif;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow: hidden;
  background:
    linear-gradient(rgba(13, 24, 48, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(13, 24, 48, 0.025) 1px, transparent 1px),
    var(--paper);
  background-size: 28px 28px;
}

button,
a {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 3px;
}

.ambient {
  position: fixed;
  z-index: -1;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.18;
  pointer-events: none;
}

.ambient--one {
  top: -220px;
  right: 8vw;
  background: var(--blue-bright);
}

.ambient--two {
  bottom: -280px;
  left: 10vw;
  background: var(--signal);
}

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--header);
  display: grid;
  grid-template-columns: 160px minmax(220px, 520px) 160px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 36px;
  border-bottom: 1px solid var(--border);
  background: rgba(247, 248, 245, 0.86);
  backdrop-filter: blur(18px);
}

.brand {
  display: grid;
  width: 63px;
  height: 48px;
  place-items: center;
  border-radius: 14px;
  background: var(--ink);
  text-decoration: none;
  box-shadow: 0 10px 28px rgba(34, 34, 42, 0.14);
}

.brand img {
  display: block;
  width: 43px;
  height: auto;
}

.topbar__center {
  display: grid;
  align-items: center;
  gap: 7px;
}

.module-button {
  display: grid;
  grid-template-columns: 32px 1fr 18px;
  align-items: center;
  gap: 10px;
  min-width: 0;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.module-button__index {
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.module-button__label {
  overflow: hidden;
  font-weight: 700;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.module-button__chevron {
  color: var(--ink-soft);
  font-size: 18px;
}

.progress {
  height: 3px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(235, 4, 16, 0.12);
}

.progress__bar {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--blue);
  transition: width 420ms ease;
}

.language-switch {
  display: flex;
  justify-content: flex-end;
  gap: 4px;
}

.language-switch button {
  min-width: 42px;
  padding: 8px 9px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.language-switch button:hover,
.language-switch button.is-active {
  background: var(--ink);
  color: var(--white);
}

.deck {
  height: 100vh;
  padding: calc(var(--header) + 24px) 38px calc(var(--controls) + 20px);
}

.lesson {
  display: none;
  width: min(1260px, 100%);
  min-width: 0;
  height: 100%;
  margin: 0 auto;
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}

.lesson.is-active {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  animation: lesson-in 520ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes lesson-in {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.995);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.lesson__inner {
  align-self: center;
  width: 100%;
  min-width: 0;
  max-width: 100%;
  padding: 24px 0;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.lesson h1,
.lesson h2,
.lesson h3,
.course-menu h2 {
  margin-top: 0;
  color: var(--ink);
}

.lesson h1,
.lesson h2 {
  max-width: 1040px;
  margin-bottom: 22px;
  font-family: "Unbounded", sans-serif;
  font-size: clamp(36px, 5.2vw, 74px);
  line-height: 1.04;
  letter-spacing: -0.055em;
  overflow-wrap: break-word;
}

.lesson h2 {
  font-size: clamp(32px, 4.1vw, 60px);
}

.lesson h3 {
  margin-bottom: 10px;
  font-size: clamp(20px, 2vw, 28px);
  line-height: 1.15;
}

.lead {
  max-width: 850px;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(18px, 2vw, 27px);
  line-height: 1.48;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
  align-items: center;
  gap: 70px;
}

.hero-title__accent {
  color: var(--blue);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 38px;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 700;
}

.hero-visual {
  position: relative;
  min-height: 510px;
}

.hero-orbit {
  position: absolute;
  inset: 7% 3% 7% 3%;
  border: 1px dashed rgba(235, 4, 16, 0.34);
  border-radius: 50%;
  animation: orbit 24s linear infinite;
}

@keyframes orbit {
  to {
    transform: rotate(360deg);
  }
}

.hero-orbit::before,
.hero-orbit::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 10px rgba(255, 189, 53, 0.17);
}

.hero-orbit::before {
  top: 13%;
  right: 7%;
}

.hero-orbit::after {
  bottom: 11%;
  left: 11%;
  background: var(--blue);
  box-shadow: 0 0 0 10px rgba(235, 4, 16, 0.13);
}

.phone {
  position: absolute;
  inset: 34px 56px;
  overflow: hidden;
  border: 8px solid var(--ink);
  border-radius: 48px;
  background: var(--white);
  box-shadow: var(--shadow);
  transform: rotate(3deg);
}

.phone::before {
  content: "";
  position: absolute;
  z-index: 2;
  top: 10px;
  left: 50%;
  width: 92px;
  height: 21px;
  border-radius: 999px;
  background: var(--ink);
  transform: translateX(-50%);
}

.phone__screen {
  height: 100%;
  padding: 52px 24px 24px;
  background:
    radial-gradient(circle at 80% 5%, rgba(255, 43, 52, 0.18), transparent 28%),
    #f3f6f8;
}

.phone__topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 700;
}

.phone__greeting {
  margin-bottom: 22px;
  font-size: 24px;
  font-weight: 800;
}

.phone__task {
  margin-bottom: 12px;
  padding: 16px;
  border-left: 4px solid var(--blue);
  background: var(--white);
  box-shadow: 0 10px 28px rgba(13, 24, 48, 0.07);
}

.phone__task small {
  display: block;
  margin-bottom: 5px;
  color: var(--blue);
  font-weight: 800;
}

.phone__ai {
  position: absolute;
  right: 24px;
  bottom: 24px;
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  color: var(--white);
  font-family: "Unbounded", sans-serif;
  font-size: 14px;
  box-shadow: 0 12px 28px rgba(13, 24, 48, 0.28);
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 42px;
}

.stat {
  position: relative;
  min-height: 230px;
  padding: 26px;
  overflow: hidden;
  border-top: 5px solid var(--blue);
  background: rgba(255, 255, 255, 0.66);
}

.stat:nth-child(2) {
  border-color: var(--signal);
}

.stat:nth-child(3) {
  border-color: var(--green);
}

.stat__number {
  display: block;
  margin-bottom: 16px;
  font-family: "Unbounded", sans-serif;
  font-size: clamp(38px, 5vw, 68px);
  line-height: 1;
  letter-spacing: -0.07em;
}

.stat p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.45;
}

.source-link {
  display: inline-block;
  margin-top: 14px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 38px;
}

.panel {
  padding: clamp(24px, 3.4vw, 46px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 10px 40px rgba(13, 24, 48, 0.055);
}

.panel--dark {
  border-color: transparent;
  background: var(--ink);
  color: var(--white);
}

.panel--dark h3,
.panel--dark .eyebrow {
  color: var(--white);
}

.panel--signal {
  border-color: transparent;
  background: var(--signal);
}

.panel p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.55;
}

.panel--dark p {
  color: rgba(255, 255, 255, 0.76);
}

.story-switch {
  display: flex;
  width: max-content;
  max-width: 100%;
  margin: 34px 0 22px;
  padding: 5px;
  border-radius: 999px;
  background: var(--blue-pale);
}

.story-switch button {
  padding: 11px 18px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  font-weight: 800;
}

.story-switch button.is-active {
  background: var(--ink);
  color: var(--white);
}

.story-path {
  display: none;
}

.story-path.is-active {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  animation: lesson-in 340ms ease both;
}

.story-step {
  position: relative;
  min-height: 210px;
  padding: 22px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.7);
}

.story-step__number {
  display: grid;
  width: 34px;
  height: 34px;
  margin-bottom: 24px;
  place-items: center;
  border-radius: 50%;
  background: var(--blue-pale);
  color: var(--blue);
  font-weight: 800;
}

.story-step h3 {
  font-size: 19px;
}

.story-step p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.45;
}

.story-path[data-story="memory"] .story-step:last-child {
  border-color: rgba(199, 74, 69, 0.45);
  background: rgba(199, 74, 69, 0.08);
}

.story-path[data-story="system"] .story-step:last-child {
  border-color: rgba(23, 134, 111, 0.45);
  background: rgba(23, 134, 111, 0.08);
}

.principles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  margin-top: 34px;
  background: var(--border);
  border: 1px solid var(--border);
}

.principle {
  min-height: 170px;
  padding: 26px;
  background: var(--paper);
}

.principle__index {
  display: block;
  margin-bottom: 16px;
  color: var(--blue);
  font-family: "Unbounded", sans-serif;
  font-size: 13px;
}

.principle p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.48;
}

.object-explorer {
  display: grid;
  grid-template-columns: minmax(250px, 0.75fr) minmax(0, 1.25fr);
  gap: 34px;
  margin-top: 36px;
}

.object-list {
  display: grid;
  align-content: start;
  gap: 4px;
}

.object-list button {
  display: grid;
  grid-template-columns: 36px 1fr;
  align-items: center;
  gap: 12px;
  padding: 10px 15px;
  border: 1px solid transparent;
  border-radius: 14px;
  background: transparent;
  cursor: pointer;
  text-align: left;
}

.object-list button:hover,
.object-list button.is-active {
  border-color: var(--border);
  background: var(--white);
  box-shadow: 0 10px 24px rgba(13, 24, 48, 0.06);
}

.object-list__icon {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 11px;
  background: var(--blue-pale);
  color: var(--blue);
  font-weight: 800;
}

.object-detail {
  min-height: 330px;
  padding: clamp(28px, 4vw, 50px);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--white);
}

.object-detail h3 {
  color: var(--white);
  font-size: clamp(30px, 4vw, 50px);
}

.object-detail p {
  max-width: 700px;
  color: rgba(255, 255, 255, 0.75);
  font-size: 19px;
  line-height: 1.55;
}

.object-detail__example {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--signal);
  font-weight: 700;
}

.funnel {
  display: grid;
  gap: 8px;
  width: min(860px, 100%);
  margin: 36px auto 0;
}

.funnel button {
  min-height: 58px;
  margin: 0 auto;
  border: 0;
  background: var(--blue-pale);
  color: var(--ink);
  cursor: pointer;
  font-weight: 800;
  transition: 180ms ease;
}

.funnel button:hover {
  background: var(--blue);
  color: var(--white);
  transform: translateY(-2px);
}

.funnel button.is-active {
  background: var(--blue);
  color: var(--white);
  transform: none;
}

.funnel button:nth-child(1) { width: 100%; }
.funnel button:nth-child(2) { width: 88%; }
.funnel button:nth-child(3) { width: 76%; }
.funnel button:nth-child(4) { width: 64%; }
.funnel button:nth-child(5) { width: 52%; }
.funnel button:nth-child(6) { width: 40%; }

.funnel-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 22px;
  min-height: 104px;
  margin-top: 26px;
  padding: 24px;
  border-top: 1px solid var(--border);
}

.funnel-detail strong {
  display: block;
  margin-bottom: 6px;
  color: var(--blue);
}

.product-proof {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  align-items: start;
  gap: 28px;
  margin-top: 22px;
}

.lesson__inner--product-proof {
  align-self: start;
  padding-top: 8px;
}

.lesson__inner--product-proof h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 3.25vw, 48px);
}

.lesson__inner--product-proof .lead {
  font-size: clamp(17px, 1.55vw, 22px);
}

.product-proof__screen {
  min-width: 0;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: #eef2f4;
  box-shadow: 0 22px 60px rgba(13, 24, 48, 0.14);
}

.product-proof__chrome {
  display: flex;
  min-height: 42px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.92);
}

.product-proof__chrome > span {
  display: flex;
  gap: 6px;
}

.product-proof__chrome i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
}

.product-proof__chrome i:first-child { background: #ff6a39; }
.product-proof__chrome i:nth-child(2) { background: var(--signal); }
.product-proof__chrome i:last-child { background: var(--green); }

.product-proof__chrome strong {
  overflow: hidden;
  color: var(--ink-soft);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.product-proof__screen img {
  display: block;
  width: 100%;
  max-height: 350px;
  object-fit: contain;
  object-position: top center;
  background: #fff;
}

.product-proof__screen figcaption {
  padding: 12px 16px 14px;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.45;
}

.product-proof__points {
  display: grid;
  gap: 10px;
}

.product-proof__points article {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.7);
}

.product-proof__points article > span {
  color: var(--blue);
  font-family: "Unbounded", sans-serif;
  font-size: 11px;
  font-weight: 700;
}

.product-proof__points h3 {
  margin-bottom: 5px;
  font-size: 18px;
}

.product-proof__points p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.45;
}

.product-proof--assistant .product-proof__screen,
.product-proof--training .product-proof__screen {
  width: min(720px, 100%);
  justify-self: center;
}

.next-step-builder {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 34px;
}

.choice {
  min-height: 240px;
  padding: 26px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  text-align: left;
  transition: 180ms ease;
}

.choice:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.choice.is-correct {
  border-color: var(--green);
  background: rgba(23, 134, 111, 0.07);
}

.choice.is-wrong {
  border-color: var(--red);
  background: rgba(199, 74, 69, 0.07);
}

.choice__label {
  display: block;
  margin-bottom: 28px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.choice__text {
  font-size: 23px;
  font-weight: 800;
  line-height: 1.35;
}

.choice__feedback {
  display: none;
  margin-top: 20px;
  color: var(--ink-soft);
  line-height: 1.45;
}

.choice.is-correct .choice__feedback,
.choice.is-wrong .choice__feedback {
  display: block;
}

.journey {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  column-gap: 16px;
  row-gap: 28px;
  margin-top: 42px;
}

.journey::before {
  display: none;
}

.journey__step {
  position: relative;
  padding-top: 64px;
}

.journey__step::before {
  content: attr(data-step);
  position: absolute;
  z-index: 1;
  top: 8px;
  left: 0;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 4px solid var(--paper);
  border-radius: 50%;
  background: var(--ink);
  color: var(--white);
  font-weight: 800;
}

.journey__step::after {
  content: "";
  position: absolute;
  top: 29px;
  right: -16px;
  left: 48px;
  height: 2px;
  background: var(--border);
}

.journey__step:nth-child(4n)::after,
.journey__step:last-child::after {
  display: none;
}

.journey__step p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.45;
}

.dayline {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 26px;
  margin-top: 38px;
}

.dayline__times,
.dayline__work {
  display: grid;
  gap: 8px;
}

.dayline__time,
.dayline__item {
  min-height: 72px;
  padding: 18px;
  border-bottom: 1px solid var(--border);
}

.dayline__time {
  color: var(--blue);
  font-family: "Unbounded", sans-serif;
  font-size: 14px;
}

.dayline__item {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 18px;
}

.dayline__item p {
  margin: 4px 0 0;
  color: var(--ink-soft);
}

.dayline__tag {
  padding: 7px 11px;
  border-radius: 999px;
  background: var(--blue-pale);
  color: var(--blue);
  font-size: 11px;
  font-weight: 800;
  white-space: nowrap;
}

.mobile-first {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 430px;
  align-items: center;
  gap: 50px;
  margin-top: 28px;
}

.mobile-first h2 {
  font-size: clamp(30px, 3.6vw, 52px);
}

.benefit-list {
  display: grid;
  gap: 0;
  margin-top: 18px;
}

.benefit {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.benefit__icon {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 50%;
  background: var(--signal-soft);
  font-weight: 800;
}

.benefit p {
  margin: 5px 0 0;
  color: var(--ink-soft);
}

.ai-demo {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 36px;
  margin-top: 34px;
}

.voice-card {
  padding: 34px;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--white);
}

.voice-wave {
  display: flex;
  align-items: center;
  gap: 5px;
  height: 70px;
  margin: 28px 0;
}

.voice-wave span {
  width: 5px;
  height: 20%;
  border-radius: 99px;
  background: var(--signal);
  animation: wave 1s ease-in-out infinite alternate;
}

.voice-wave span:nth-child(2n) { animation-delay: -0.3s; }
.voice-wave span:nth-child(3n) { animation-delay: -0.6s; }

@keyframes wave {
  to { height: 100%; }
}

.voice-card blockquote {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.45;
}

.confirmation {
  display: grid;
  gap: 12px;
  align-content: center;
}

.confirmation__item {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.7);
}

.confirmation__item span {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  background: var(--blue-pale);
  color: var(--blue);
  font-weight: 800;
}

.team-map {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: 18px;
  width: min(900px, 100%);
  margin: 42px auto 0;
}

.team-map__center {
  grid-column: 1 / -1;
  justify-self: center;
  width: min(440px, 100%);
  padding: 30px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--white);
  text-align: center;
  box-shadow: var(--shadow);
}

.team-map__node {
  padding: 22px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.7);
}

.team-map__node strong {
  color: var(--blue);
}

.team-map__node p {
  margin: 6px 0 0;
  color: var(--ink-soft);
}

.objections {
  display: grid;
  gap: 10px;
  margin-top: 32px;
}

.objection {
  border-bottom: 1px solid var(--border);
}

.objection button {
  display: grid;
  grid-template-columns: 1fr 30px;
  width: 100%;
  padding: 20px 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  font-size: 20px;
  font-weight: 800;
  text-align: left;
}

.objection__answer {
  max-height: 0;
  overflow: hidden;
  color: var(--ink-soft);
  line-height: 1.55;
  transition: max-height 280ms ease, padding 280ms ease;
}

.objection.is-open .objection__answer {
  max-height: 240px;
  padding: 0 0 24px;
}

.objection__plus {
  transition: transform 220ms ease;
}

.objection.is-open .objection__plus {
  transform: rotate(45deg);
}

.quiz {
  margin-top: 32px;
}

.quiz__question {
  display: none;
}

.quiz__question.is-active {
  display: block;
  animation: lesson-in 320ms ease both;
}

.quiz.needs-answer .quiz__answers {
  animation: answer-pulse 680ms ease;
}

@keyframes answer-pulse {
  0%, 100% { transform: translateY(0); }
  35% { transform: translateY(-4px); }
  70% { transform: translateY(2px); }
}

.quiz__answers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 24px;
}

.quiz__answers button {
  min-height: 110px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  font-weight: 700;
  text-align: left;
}

.quiz__answers button:hover {
  border-color: var(--blue);
  background: var(--blue-pale);
}

.quiz__answers button.is-correct {
  border-color: var(--green);
  background: rgba(23, 134, 111, 0.1);
}

.quiz__answers button.is-wrong {
  border-color: var(--red);
  background: rgba(199, 74, 69, 0.1);
}

.quiz__status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 20px;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 700;
}

.quiz__result {
  display: none;
  padding: 38px;
  border-radius: var(--radius);
  background: var(--signal);
}

.quiz__result.is-visible {
  display: block;
}

.source-list {
  display: grid;
  gap: 10px;
  margin-top: 30px;
}

.source-list a,
.source-list div {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  color: var(--ink);
  text-decoration: none;
}

.source-list a:hover strong {
  color: var(--blue);
}

.source-list span {
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 700;
}

.source-list strong {
  line-height: 1.4;
}

.closing {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 60px;
}

.closing__seal {
  display: grid;
  width: min(340px, calc(100% - 80px));
  aspect-ratio: 1;
  justify-self: center;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  color: var(--blue);
  font-family: "Unbounded", sans-serif;
  font-size: clamp(28px, 4vw, 54px);
  text-align: center;
  transform: rotate(-6deg);
}

.course-menu {
  position: fixed;
  z-index: 90;
  top: 0;
  left: 0;
  width: min(560px, 92vw);
  height: 100vh;
  padding: 32px;
  overflow: auto;
  background: var(--paper);
  box-shadow: 30px 0 80px rgba(13, 24, 48, 0.2);
  transform: translateX(-105%);
  transition: transform 360ms cubic-bezier(0.22, 1, 0.36, 1);
}

.course-menu.is-open {
  transform: translateX(0);
}

.course-menu__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 26px;
}

.course-menu h2 {
  margin-bottom: 0;
  font-family: "Unbounded", sans-serif;
  font-size: 30px;
  letter-spacing: -0.04em;
}

.icon-button {
  display: grid;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--white);
  cursor: pointer;
  font-size: 28px;
}

.course-menu__list {
  display: grid;
}

.course-menu__list button {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 14px;
  padding: 16px 0;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  text-align: left;
}

.course-menu__list button.is-active,
.course-menu__list button:hover {
  color: var(--blue);
}

.course-menu__list small {
  color: var(--ink-soft);
  font-weight: 800;
}

.menu-backdrop {
  position: fixed;
  z-index: 80;
  inset: 0;
  display: none;
  border: 0;
  background: rgba(13, 24, 48, 0.42);
  backdrop-filter: blur(4px);
}

.menu-backdrop.is-visible {
  display: block;
}

.deck-controls {
  position: fixed;
  z-index: 40;
  right: 0;
  bottom: 0;
  left: 0;
  height: var(--controls);
  display: grid;
  grid-template-columns: 160px 1fr minmax(280px, auto);
  align-items: center;
  gap: 20px;
  padding: 0 36px;
  border-top: 1px solid var(--border);
  background: rgba(247, 248, 245, 0.9);
  backdrop-filter: blur(18px);
}

.control-button {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 11px 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  font-weight: 800;
}

.control-button--next {
  justify-content: flex-end;
}

.next-controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
}

.skip-button {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 12px;
  font-weight: 750;
  white-space: nowrap;
}

.skip-button:hover {
  border-color: var(--accent);
  color: var(--accent-deep);
}

.skip-button[hidden] {
  display: none;
}

.control-button:disabled {
  opacity: 0.3;
  cursor: default;
}

.deck-counter {
  justify-self: center;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 800;
}

.deck-center {
  display: grid;
  justify-items: center;
  gap: 5px;
}

.lesson__inner--reading {
  align-self: start;
  padding-top: 12px;
}

.reading-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.reading-progress {
  color: var(--accent-deep);
  font-family: "Unbounded", sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.lesson__inner--reading h2 {
  max-width: 1000px;
  margin-bottom: 30px;
  font-size: clamp(32px, 4.1vw, 56px);
}

.reading-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(290px, 0.72fr);
  align-items: start;
  gap: clamp(28px, 4vw, 58px);
}

.reading-main {
  padding: 6px 30px 8px 32px;
  border-left: 5px solid var(--accent);
}

.reading-main h3 {
  margin: 0 0 20px;
  font-size: clamp(26px, 2.7vw, 38px);
  line-height: 1.15;
}

.reading-main p,
.reading-main li {
  color: var(--ink-soft);
  font-size: clamp(18px, 1.55vw, 22px);
  line-height: 1.62;
}

.reading-main p {
  margin: 0 0 18px;
}

.reading-main p:last-child {
  margin-bottom: 0;
}

.reading-main ul {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-left: 25px;
}

.reading-support {
  display: grid;
  gap: 14px;
}

.reading-note {
  padding: 24px 0 0;
  border-top: 3px solid var(--accent);
}

.reading-note span {
  display: block;
  margin-bottom: 12px;
  color: var(--accent-deep);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.reading-note p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.58;
}

.reading-note--example {
  padding: 24px;
  border: 0;
  background: var(--accent-pale);
}

.reading-note--takeaway {
  padding: 24px;
  border: 0;
  background: var(--ink);
}

.reading-note--takeaway span {
  color: var(--accent-bright);
}

.reading-note--takeaway p {
  color: rgba(255, 255, 255, 0.84);
}

.lesson__inner--comparison {
  align-self: start;
}

.comparison {
  margin-top: 28px;
  border-top: 1px solid var(--border-strong);
}

.comparison__head,
.comparison__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.comparison__head {
  color: var(--accent-deep);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.comparison__head span {
  padding: 14px 22px;
}

.comparison__head span:last-child {
  color: var(--ink);
}

.comparison__row {
  border-top: 1px solid var(--border);
}

.comparison__row > div {
  display: flex;
  align-items: center;
  min-height: 62px;
  padding: 13px 22px;
}

.comparison__row > div:first-child {
  color: var(--ink-soft);
  background: rgba(34, 34, 42, 0.035);
}

.comparison__row > div:last-child {
  border-left: 1px solid var(--border);
  background: rgba(255, 43, 52, 0.055);
}

.comparison__row small {
  display: none;
}

.comparison__row p {
  margin: 0;
  font-size: clamp(16px, 1.4vw, 20px);
  font-weight: 650;
  line-height: 1.35;
}

.comparison__note {
  max-width: 980px;
  margin: 22px 0 0;
  padding-left: 20px;
  border-left: 4px solid var(--accent);
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.5;
}

.lesson--supplemental .lesson__inner {
  align-self: start;
  padding-top: 14px;
}

.lesson--supplemental h2 {
  max-width: 1120px;
  margin-bottom: 14px;
  font-size: clamp(34px, 4.2vw, 58px);
}

.lesson--supplemental .lead {
  max-width: 1120px;
  font-size: clamp(17px, 1.65vw, 23px);
}

.lesson--supplemental .journey {
  gap: 12px;
  margin-top: 26px;
}

.lesson--supplemental .journey__step {
  padding-top: 54px;
}

.lesson--supplemental .journey__step h3 {
  margin-bottom: 7px;
  font-size: 18px;
}

.lesson--supplemental .journey__step p {
  font-size: 15px;
  line-height: 1.38;
}

.lesson--supplemental .principles {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 22px;
}

.lesson--supplemental .principle {
  min-height: 112px;
  padding: 15px 20px;
}

.lesson--supplemental .principle__index {
  margin-bottom: 8px;
}

.lesson--supplemental .principle h3 {
  margin-bottom: 7px;
  font-size: 18px;
}

.lesson--supplemental .principle p {
  font-size: 15px;
  line-height: 1.38;
}

.lesson--supplemental .dayline {
  margin-top: 20px;
}

.lesson--supplemental .dayline__time,
.lesson--supplemental .dayline__item {
  min-height: 58px;
  padding: 11px 16px;
}

.lesson--supplemental .dayline__item p {
  font-size: 14px;
  line-height: 1.35;
}

.lesson--supplemental .objections {
  gap: 4px;
  margin-top: 18px;
}

.lesson--supplemental .objection button {
  padding: 13px 0;
  font-size: 17px;
}

.lesson--supplemental .comparison {
  margin-top: 18px;
}

.lesson--supplemental .comparison__row > div {
  min-height: 50px;
  padding: 9px 18px;
}

.lesson--supplemental .comparison__row p {
  font-size: clamp(15px, 1.25vw, 18px);
}

.lesson--supplemental .comparison__note {
  margin-top: 14px;
  font-size: 15px;
}

@media (min-width: 921px) {
  .lesson {
    overflow: hidden;
  }

  .lesson.is-compact .lesson__inner {
    padding-block: 8px;
  }

  .lesson.is-compact .eyebrow {
    margin-bottom: 8px;
  }

  .lesson.is-compact h1,
  .lesson.is-compact h2,
  .lesson.is-compact .lesson__inner--reading h2,
  .lesson.is-compact.lesson--supplemental h2 {
    margin-bottom: 12px;
    font-size: clamp(30px, 3.5vw, 48px);
    line-height: 1.05;
  }

  .lesson.is-compact .lead,
  .lesson.is-compact.lesson--supplemental .lead {
    font-size: clamp(16px, 1.45vw, 20px);
    line-height: 1.38;
  }

  .lesson.is-compact .split,
  .lesson.is-compact .stat-row,
  .lesson.is-compact .story-switch,
  .lesson.is-compact .principles,
  .lesson.is-compact .object-explorer,
  .lesson.is-compact .funnel,
  .lesson.is-compact .product-proof,
  .lesson.is-compact .next-step-builder,
  .lesson.is-compact .journey,
  .lesson.is-compact .dayline,
  .lesson.is-compact .ai-demo,
  .lesson.is-compact .team-map,
  .lesson.is-compact .objections,
  .lesson.is-compact .quiz {
    margin-top: 18px;
  }

  .lesson.is-compact .panel {
    padding: 24px;
  }

  .lesson.is-compact .principle {
    min-height: 112px;
    padding: 17px 20px;
  }

  .lesson.is-compact .principle__index {
    margin-bottom: 8px;
  }

  .lesson.is-compact .object-detail {
    min-height: 250px;
    padding: 28px;
  }

  .lesson.is-compact .object-detail h3 {
    font-size: 32px;
  }

  .lesson.is-compact .object-detail p {
    font-size: 16px;
  }

  .lesson.is-compact .funnel {
    gap: 5px;
  }

  .lesson.is-compact .funnel button {
    min-height: 42px;
  }

  .lesson.is-compact .funnel-detail {
    min-height: 82px;
    margin-top: 12px;
    padding: 14px;
  }

  .lesson.is-compact .product-proof__screen img {
    max-height: 285px;
  }

  .lesson.is-compact .choice {
    min-height: 175px;
    padding: 22px;
  }

  .lesson.is-compact .choice__label {
    margin-bottom: 16px;
  }

  .lesson.is-compact .journey {
    row-gap: 18px;
  }

  .lesson.is-compact .journey__step {
    padding-top: 54px;
  }

  .lesson.is-compact .journey__step h3 {
    margin-bottom: 6px;
    font-size: 18px;
  }

  .lesson.is-compact .journey__step p {
    font-size: 15px;
    line-height: 1.35;
  }

  .lesson.is-compact .dayline__time,
  .lesson.is-compact .dayline__item {
    min-height: 50px;
    padding: 9px 14px;
  }

  .lesson.is-compact .dayline__item p {
    font-size: 14px;
    line-height: 1.3;
  }

  .lesson.is-compact .reading-layout {
    gap: 28px;
  }

  .lesson.is-compact .reading-main {
    padding-top: 2px;
    padding-bottom: 2px;
  }

  .lesson.is-compact .reading-main h3 {
    margin-bottom: 12px;
    font-size: 26px;
  }

  .lesson.is-compact .reading-main p,
  .lesson.is-compact .reading-main li {
    font-size: 17px;
    line-height: 1.45;
  }

  .lesson.is-compact .reading-main p {
    margin-bottom: 10px;
  }

  .lesson.is-compact .reading-main ul {
    gap: 7px;
  }

  .lesson.is-compact .reading-note,
  .lesson.is-compact .reading-note--example,
  .lesson.is-compact .reading-note--takeaway {
    padding: 16px;
  }

  .lesson.is-compact .reading-note p {
    font-size: 15px;
    line-height: 1.42;
  }

  .lesson.is-ultra-compact h1,
  .lesson.is-ultra-compact h2,
  .lesson.is-ultra-compact .lesson__inner--reading h2,
  .lesson.is-ultra-compact.lesson--supplemental h2 {
    font-size: clamp(27px, 3vw, 40px);
  }

  .lesson.is-ultra-compact .lead,
  .lesson.is-ultra-compact.lesson--supplemental .lead {
    font-size: 15px;
  }

  .lesson.is-ultra-compact .reading-main p,
  .lesson.is-ultra-compact .reading-main li,
  .lesson.is-ultra-compact .panel p {
    font-size: 14px;
  }
}

@media (max-width: 920px) {
  :root {
    --header: 66px;
    --controls: 68px;
  }

  .topbar {
    grid-template-columns: 74px 1fr auto;
    gap: 10px;
    padding: 0 16px;
  }

  .brand {
    width: 54px;
    height: 42px;
  }

  .brand img { width: 38px; }

  .lesson--supplemental .principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .language-switch button {
    min-width: 34px;
    padding-inline: 6px;
    font-size: 10px;
  }

  .deck {
    padding-right: 18px;
    padding-left: 18px;
  }

  .hero-layout,
  .mobile-first,
  .ai-demo,
  .closing,
  .product-proof,
  .reading-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-visual {
    min-height: 500px;
  }

  .stat-row {
    grid-template-columns: 1fr;
  }

  .stat {
    min-height: 0;
  }

  .story-path.is-active,
  .journey {
    grid-template-columns: repeat(2, 1fr);
  }

  .journey__step:nth-child(2n)::after {
    display: none;
  }

  .object-explorer {
    grid-template-columns: 1fr;
  }

  .object-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .object-list button {
    grid-template-columns: 30px 1fr;
    padding: 12px;
    font-size: 13px;
  }

  .object-list__icon {
    width: 30px;
    height: 30px;
  }

  .deck-controls {
    grid-template-columns: 100px 1fr minmax(220px, auto);
    padding: 0 18px;
  }

}

@media (max-width: 640px) {
  body {
    overflow: auto;
  }

  .topbar {
    grid-template-columns: 58px minmax(100px, 1fr) 104px;
    gap: 6px;
    padding: 0 12px;
  }

  .brand {
    width: 48px;
    height: 38px;
    border-radius: 11px;
  }

  .brand img { width: 34px; }

  .language-switch {
    position: static;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .language-switch button {
    min-width: 30px;
    padding: 7px 4px;
  }

  .module-button {
    grid-template-columns: 24px minmax(0, 1fr) 12px;
    gap: 4px;
  }

  .module-button__index,
  .module-button__label {
    font-size: 11px;
  }

  .deck {
    height: auto;
    min-height: 100vh;
    padding-top: calc(var(--header) + 20px);
    padding-bottom: calc(var(--controls) + 84px);
  }

  .lesson {
    height: auto;
    min-height: calc(100vh - var(--header) - var(--controls) - 70px);
    overflow: visible;
  }

  .lesson__inner {
    align-self: start;
    padding-top: 18px;
  }

  .lesson h1,
  .lesson h2 {
    font-size: clamp(32px, 10vw, 48px);
  }

  .lead {
    font-size: 18px;
  }

  .hero-visual {
    min-height: 430px;
  }

  .phone {
    inset: 20px 28px;
    border-radius: 38px;
  }

  .split,
  .principles,
  .next-step-builder,
  .quiz__answers,
  .funnel-detail {
    grid-template-columns: 1fr;
  }

  .lesson--supplemental .principles {
    grid-template-columns: 1fr;
  }

  .story-path.is-active,
  .journey {
    grid-template-columns: 1fr;
  }

  .journey::before {
    content: "";
    position: absolute;
    display: block;
    top: 0;
    bottom: 0;
    left: 21px;
    width: 2px;
    height: auto;
    background: var(--border);
  }

  .journey__step {
    padding: 4px 0 26px 64px;
  }

  .journey__step::before {
    top: 0;
  }

  .journey__step::after {
    display: none;
  }

  .object-list {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
  }

  .object-list button {
    min-width: 160px;
    scroll-snap-align: start;
  }

  .object-detail {
    min-height: 330px;
  }

  .dayline {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .dayline__times {
    display: none;
  }

  .dayline__item {
    grid-template-columns: 1fr;
  }

  .team-map {
    grid-template-columns: 1fr;
  }

  .product-proof__screen img {
    max-height: none;
  }

  .team-map__center {
    grid-column: 1;
    border-radius: 24px;
  }

  .source-list a,
  .source-list div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .deck-controls {
    grid-template-columns: 1fr auto 1fr;
  }

  .next-controls {
    gap: 8px;
  }

  .skip-button {
    max-width: 116px;
    padding: 7px 9px;
    overflow: hidden;
    font-size: 10px;
    text-overflow: ellipsis;
  }

  .lesson__inner--reading h2 {
    margin-bottom: 24px;
    font-size: 31px;
  }

  .reading-head {
    align-items: flex-start;
  }

  .reading-main {
    padding: 4px 0 4px 20px;
    border-left-width: 4px;
  }

  .reading-main h3 {
    font-size: 25px;
  }

  .reading-main p,
  .reading-main li {
    font-size: 18px;
  }

  .reading-note,
  .reading-note--example,
  .reading-note--takeaway {
    padding: 20px;
  }

  .comparison {
    margin-top: 22px;
  }

  .comparison__head {
    display: none;
  }

  .comparison__row {
    grid-template-columns: 1fr;
    padding: 14px 0;
    gap: 8px;
  }

  .comparison__row > div {
    display: block;
    min-height: 0;
    padding: 14px 16px;
    border: 0 !important;
  }

  .comparison__row small {
    display: block;
    margin-bottom: 5px;
    color: var(--accent-deep);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .comparison__row p {
    font-size: 17px;
  }

  .comparison__note {
    font-size: 16px;
  }

  .control-button span:not([aria-hidden="true"]) {
    display: none;
  }

  .course-menu {
    padding: 24px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  body {
    overflow: visible;
    background: var(--white);
  }

  .topbar,
  .deck-controls,
  .course-menu,
  .menu-backdrop,
  .ambient {
    display: none !important;
  }

  .deck {
    height: auto;
    padding: 0;
  }

  .lesson,
  .lesson.is-active {
    display: block;
    height: auto;
    min-height: 100vh;
    padding: 24px;
    break-after: page;
  }
}