:root {
  --color-bg: #f6f8f7;
  --color-surface: #ffffff;
  --color-surface-soft: #e7f4ed;
  --color-ink: #142923;
  --color-muted: #4a5c56;
  --color-accent: #087f5b;
  --color-accent-strong: #056648;
  --color-gold: #c48a14;
  --color-error: #b4333c;
  --color-error-soft: #f8e8e9;
  --color-line: #d7e0db;
  --color-focus: #087f5b;
  --color-hero: #043324;
  --color-hero-mid: #056648;
  --shadow-sm: 0 1px 2px rgba(20, 41, 35, 0.06);
  --shadow-md: 0 8px 24px rgba(20, 41, 35, 0.06);
  --shadow-lg: 0 24px 60px rgba(4, 32, 24, 0.18);
  --font-sans: "Manrope", "Segoe UI", sans-serif;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --page: 1120px;
  --touch: 48px;
  --motion-fast: 150ms;
  --motion-med: 240ms;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #101714;
  --color-surface: #1a221f;
  --color-surface-soft: #1f2d28;
  --color-ink: #e8f0ec;
  --color-muted: #9aada6;
  --color-accent: #3ecf9a;
  --color-accent-strong: #7ee0b8;
  --color-gold: #e2b04a;
  --color-error: #f08a90;
  --color-error-soft: #3a1d20;
  --color-line: #2a3833;
  --color-focus: #3ecf9a;
  --color-hero: #061510;
  --color-hero-mid: #0a3d2c;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.22);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.4);
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --motion-fast: 1ms;
    --motion-med: 1ms;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font: 16px/1.5 var(--font-sans);
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-accent-strong);
}

h1,
h2,
h3 {
  font-family: var(--font-sans);
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.wrap {
  width: min(calc(100% - 32px), var(--page));
  margin: 0 auto;
}

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  z-index: 20;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-ink);
}

.skip:focus {
  top: 12px;
}

.kicker {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent-strong);
}

.kicker.light {
  color: #9be7c4;
}

.muted {
  color: var(--color-muted);
}

.top {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-line);
}

.bar {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--color-ink);
  text-decoration: none;
}

.brand span {
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.04em;
  line-height: 1;
}

.mark {
  width: 36px;
  height: 32px;
  object-fit: contain;
  flex: none;
}

.nav {
  display: flex;
  gap: 18px;
  margin-left: auto;
}

.nav a {
  color: var(--color-muted);
  font-weight: 700;
  text-decoration: none;
}

.nav a:hover {
  color: var(--color-ink);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: none;
}

.bar > .btn-sm:last-child {
  margin-left: auto;
}

.icon-btn,
.btn,
.fake-btn {
  min-height: var(--touch);
  border-radius: var(--radius-md);
  font: 700 16px/1.2 var(--font-sans);
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  min-height: 44px;
  padding: 0;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-ink);
}

.icon-btn svg {
  width: 22px;
  height: 22px;
}

.theme-sun {
  display: none;
}

.theme-moon {
  display: block;
}

html[data-theme="dark"] .theme-sun {
  display: block;
}

html[data-theme="dark"] .theme-moon {
  display: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border: 1px solid transparent;
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
}

.btn:hover {
  background: var(--color-accent-strong);
}

.btn-sm {
  min-height: 44px;
  padding: 0 14px;
  border-radius: 999px;
}

.btn-ghost,
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-ink);
  border-color: var(--color-line);
}

.btn-ghost:hover,
.btn-secondary:hover {
  background: var(--color-surface-soft);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 56px 0 72px;
  background:
    radial-gradient(circle at 20% 10%, rgba(18, 184, 134, 0.22), transparent 36%),
    linear-gradient(180deg, var(--color-hero) 0%, var(--color-hero-mid) 72%, #087f5b 100%);
  color: #e8f0ec;
}

.hero .kicker {
  color: #9be7c4;
}

.road {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.42;
}

.road svg {
  width: 100%;
  height: 100%;
}

.road path {
  fill: none;
  stroke: #7ee0b8;
  stroke-width: 3;
  stroke-dasharray: 10 14;
  filter: drop-shadow(0 0 10px rgba(126, 224, 184, 0.7));
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 340px);
  gap: 56px;
  align-items: center;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(2.2rem, 5vw, 4rem);
  letter-spacing: -0.045em;
}

.lead {
  max-width: 34rem;
  margin: 0 0 28px;
  font-size: 1.125rem;
  color: rgba(232, 240, 236, 0.86);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.hero .btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(232, 240, 236, 0.28);
}

.hero .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
}

.proof {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  color: #c8e6d6;
  font-size: 14px;
  font-weight: 700;
}

.proof li {
  position: relative;
  padding-left: 16px;
}

.proof li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #3ecf9a;
}

.phones {
  display: flex;
  justify-content: center;
}

.phone {
  width: min(100%, 320px);
  border: 1px solid rgba(232, 240, 236, 0.16);
  border-radius: 32px;
  background: var(--color-bg);
  color: var(--color-ink);
  box-shadow: var(--shadow-lg);
}

.phone-screen {
  padding: 18px 16px 12px;
}

.phone-home {
  position: relative;
}

.app-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 700;
}

.app-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.app-brand img {
  width: 28px;
  height: 25px;
}

.pill {
  min-height: 32px;
  padding: 6px 12px;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  background: var(--color-surface);
  font-size: 13px;
}

.app-country,
.app-meta,
.topic,
.hint-line {
  margin: 0;
  color: var(--color-muted);
  font-size: 13px;
}

.app-slogan {
  margin: 4px 0 16px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-accent-strong);
}

.app-kicker {
  margin: 0;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent-strong);
}

.phone h2,
.phone h3,
.quiz h3 {
  margin: 6px 0 12px;
}

.scoreline {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.scoreline strong {
  font-size: 1.7rem;
  font-variant-numeric: tabular-nums;
}

.mini-road {
  height: 8px;
  margin: 8px 0;
  border-radius: 999px;
  background: #4e5854;
  overflow: hidden;
}

.mini-road.short {
  flex: 1;
}

.mini-fill {
  display: block;
  width: 92%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #087f5b, #63e6be);
}

.fake-btn {
  display: grid;
  place-items: center;
  margin: 14px 0 8px;
  background: var(--color-accent);
  color: #fff;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 16px 0 12px;
}

.stat-row small {
  display: block;
  color: var(--color-muted);
  font-weight: 700;
  font-size: 11px;
}

.stat-row strong {
  font-size: 1.2rem;
  font-variant-numeric: tabular-nums;
}

.entry {
  padding: 12px;
  margin-bottom: 8px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.entry strong,
.entry span {
  display: block;
}

.entry span {
  margin-top: 2px;
  color: var(--color-muted);
  font-size: 13px;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 11px;
  font-weight: 700;
  text-align: center;
}

.tabs .on {
  color: var(--color-accent);
}

.topic {
  font-weight: 700;
}

.answer {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  gap: 12px;
  align-items: center;
  width: 100%;
  min-height: 52px;
  margin: 8px 0 0;
  padding: 12px;
  text-align: left;
  border: 1.5px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-ink);
  font: 600 15px/1.4 var(--font-sans);
}

.answer .letter {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--color-bg);
  font-weight: 800;
}

.answer em {
  font-size: 12px;
  font-style: normal;
  font-weight: 800;
  color: var(--color-accent);
}

.answer.selected,
.answer:has(input:checked) {
  border-color: var(--color-accent);
  background: var(--color-surface-soft);
}

.answer.ok {
  border-color: var(--color-accent);
  background: var(--color-surface-soft);
}

.answer.bad {
  border-color: var(--color-error);
  background: var(--color-error-soft);
}

.quiz .answer {
  cursor: pointer;
}

.quiz input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.strip {
  background: var(--color-surface);
  border-block: 1px solid var(--color-line);
}

.strip-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 28px 0;
}

.strip strong {
  display: block;
  font-size: 1.6rem;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.strip span {
  color: var(--color-muted);
  font-weight: 700;
  font-size: 14px;
}

.block {
  padding: 80px 0;
}

.block.alt {
  background: var(--color-surface);
}

.block h2 {
  margin: 0 0 28px;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li,
.features article,
.school-points li {
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.block.alt .features article,
.block.alt .school-points li {
  background: var(--color-bg);
}

.steps span {
  display: block;
  margin-bottom: 12px;
  color: var(--color-accent-strong);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.steps h3,
.features h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.steps p,
.features p {
  margin: 0;
  color: var(--color-muted);
}

.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.try-grid,
.exam-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.quiz {
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.quiz .btn {
  width: 100%;
  margin-top: 16px;
}

.quiz-msg {
  margin: 12px 0 0;
  font-weight: 700;
}

.quiz-msg.ok {
  color: var(--color-accent-strong);
}

.quiz-msg.bad {
  color: var(--color-error);
}

.exam-table {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 0;
}

.exam-table div {
  padding: 16px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.exam-table .wide {
  grid-column: 1 / -1;
}

.exam-table dt {
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 700;
}

.exam-table dd {
  margin: 6px 0 0;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.cta {
  padding: 24px 0 80px;
}

.cta-box {
  padding: 48px 32px;
  border-radius: 32px;
  background:
    radial-gradient(circle at 80% 20%, rgba(18, 184, 134, 0.24), transparent 32%),
    linear-gradient(180deg, var(--color-hero), var(--color-hero-mid));
  color: #e8f0ec;
  text-align: center;
}

.cta-box h2 {
  max-width: 18ch;
  margin: 0 auto 16px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.cta-box p {
  max-width: 40rem;
  margin: 0 auto 24px;
  color: rgba(232, 240, 236, 0.84);
}

.cta-box .hero-cta {
  justify-content: center;
}

.soon {
  min-height: var(--touch);
  display: inline-flex;
  align-items: center;
  padding: 0 16px;
  color: #c8e6d6;
  font-weight: 700;
}

.foot {
  padding: 40px 0 28px;
  border-top: 1px solid var(--color-line);
  background: var(--color-surface);
}

.foot-inner {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, minmax(0, 1fr));
  gap: 32px 24px;
}

.foot-brand p,
.foot-bar {
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 600;
}

.foot-brand p {
  max-width: 28ch;
  margin: 12px 0 0;
  line-height: 1.45;
}

.foot-col {
  display: grid;
  align-content: start;
  gap: 8px;
}

.foot-col strong {
  margin-bottom: 4px;
  color: var(--color-ink);
  font-size: 13px;
}

.foot-col a,
.foot-bar a {
  color: var(--color-muted);
  font-weight: 700;
  text-decoration: none;
}

.foot-col a:hover,
.foot-bar a:hover {
  color: var(--color-accent-strong);
}

.foot-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--color-line);
}

.foot-bar p {
  margin: 0;
}

.legal {
  padding: 48px 0 80px;
}

.legal h1 {
  margin: 0 0 8px;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
}

.legal .updated {
  margin: 0 0 32px;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 700;
}

.legal h2 {
  margin: 28px 0 10px;
  font-size: 1.2rem;
}

.legal p,
.legal li {
  color: var(--color-muted);
}

.legal ul {
  padding-left: 1.2em;
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

button,
.btn {
  transition:
    transform var(--motion-fast) var(--ease-out),
    background-color var(--motion-fast) var(--ease-out),
    border-color var(--motion-fast) var(--ease-out);
}

button:active:not(:disabled),
.btn:active {
  transform: scale(0.98);
}

@media (max-width: 920px) {
  .nav {
    display: none;
  }

  .hero-grid,
  .steps,
  .features,
  .try-grid,
  .exam-layout,
  .strip-grid,
  .foot-inner {
    grid-template-columns: 1fr;
  }

  .phone-home {
    margin: 0 auto;
  }

  .hero {
    padding: 36px 0 48px;
  }

  .block {
    padding: 56px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}