:root {
  --blue: #2563eb;
  --blue-dark: #1e3a8a;
  --navy: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --bg: #f8fafc;
  --surface: #ffffff;
  --accent: #facc15;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--navy);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  align-items: center;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  padding: 14px clamp(20px, 5vw, 56px);
}

.brand {
  align-items: center;
  color: var(--navy);
  display: inline-flex;
  font-size: 1.2rem;
  gap: 10px;
  letter-spacing: 0;
}

.brand-icon {
  display: block;
  height: 36px;
  object-fit: contain;
  width: 36px;
}

.brand:hover {
  text-decoration: none;
}

.brand b {
  color: var(--blue);
}

.brand-mark {
  align-items: center;
  background: var(--blue);
  border-radius: 8px;
  color: white;
  display: inline-flex;
  font-weight: 800;
  height: 34px;
  justify-content: center;
  width: 34px;
}

nav {
  display: flex;
  gap: 20px;
  font-weight: 650;
}

nav a {
  color: var(--muted);
}

nav a[aria-current="page"] {
  color: var(--blue);
}

.hero {
  align-items: center;
  display: grid;
  gap: clamp(32px, 5vw, 64px);
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 0.8fr);
  margin: 0 auto;
  max-width: 1220px;
  min-height: 640px;
  padding: clamp(56px, 7vw, 84px) clamp(20px, 5vw, 56px);
}

.hero-copy {
  max-width: 620px;
}

.eyebrow {
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin: 0 0 12px;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.25rem, 3.2vw, 3.55rem);
  letter-spacing: 0;
  line-height: 1.08;
  margin: 0;
}

h2 {
  font-size: 1.24rem;
  line-height: 1.25;
  margin: 0 0 10px;
}

p {
  margin: 0 0 16px;
}

.lede {
  color: var(--muted);
  font-size: 1.08rem;
  margin-top: 22px;
  max-width: 560px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  align-items: center;
  background: var(--blue);
  border: 1px solid var(--blue);
  border-radius: 8px;
  color: white;
  display: inline-flex;
  font-weight: 750;
  min-height: 46px;
  padding: 10px 18px;
}

.button:hover {
  text-decoration: none;
}

.button.secondary {
  background: white;
  border-color: var(--border);
  color: var(--navy);
}

.app-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 18px 54px rgba(15, 23, 42, 0.08);
  padding: 24px;
}

.phone-top {
  background: #dbeafe;
  border-radius: 999px;
  height: 8px;
  margin-bottom: 28px;
  width: 76px;
}

.app-card h2 {
  font-size: 2rem;
}

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

.answer-preview {
  border-top: 1px solid var(--border);
  margin-top: 20px;
  padding-top: 8px;
}

.answer-row {
  display: grid;
  gap: 16px;
  grid-template-columns: 112px minmax(0, 1fr);
  padding: 11px 0;
}

.answer-row + .answer-row {
  border-top: 1px solid #eef2f7;
}

.answer-row p {
  margin: 0;
}

.compact-copy {
  font-size: 0.94rem;
}

.section-label {
  color: var(--blue-dark);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.ghost-button,
.solid-button {
  border-radius: 8px;
  display: inline-flex;
  font-size: 0.86rem;
  font-weight: 800;
  justify-content: center;
  min-width: 92px;
  padding: 9px 12px;
}

.ghost-button {
  background: white;
  border: 1px solid var(--border);
  color: var(--muted);
}

.solid-button {
  background: var(--blue);
  border: 1px solid var(--blue);
  color: white;
}

.memory-band,
.language-band,
.content-band {
  background: white;
  border-top: 1px solid var(--border);
  padding: 68px clamp(20px, 5vw, 56px);
}

.language-band {
  align-items: center;
  background: var(--bg);
  display: grid;
  gap: 36px;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  margin: 0 auto;
  max-width: 1220px;
}

.memory-loop {
  display: grid;
  gap: 28px;
  grid-template-columns: minmax(240px, 0.8fr) minmax(0, 1.2fr);
  margin: 0 auto 56px;
  max-width: 1220px;
}

.memory-loop h2 {
  font-size: clamp(1.8rem, 2.4vw, 2.55rem);
  line-height: 1.12;
  max-width: 460px;
}

.loop-steps {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, 1fr);
}

.loop-steps div {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
}

.loop-steps span {
  align-items: center;
  background: #eff6ff;
  border-radius: 8px;
  color: var(--blue-dark);
  display: inline-flex;
  font-size: 0.8rem;
  font-weight: 800;
  height: 28px;
  justify-content: center;
  margin-bottom: 12px;
  width: 28px;
}

.loop-steps strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 6px;
}

.loop-steps p {
  color: var(--muted);
  font-size: 0.94rem;
  margin: 0;
}

.review-preview-band {
  align-items: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: grid;
  gap: 36px;
  grid-template-columns: minmax(280px, 560px) minmax(320px, 1fr);
  margin: 0 auto;
  max-width: 1220px;
  padding: clamp(28px, 4vw, 52px);
}

.review-phone {
  background: white;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 18px 50px rgba(15, 23, 42, 0.07);
  padding: 24px;
}

.review-phone h2 {
  font-size: 2rem;
}

.review-answer {
  background: white;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin: 18px 0;
  padding: 14px;
}

.review-answer strong,
.review-answer span {
  display: block;
}

.review-answer span {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 4px;
}

.review-actions.wide {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.interval-panel {
  max-width: 760px;
}

.interval-panel h2 {
  font-size: clamp(1.8rem, 2.45vw, 2.65rem);
  line-height: 1.12;
}

.interval-panel p:not(.eyebrow) {
  color: var(--muted);
  font-size: 1.05rem;
}

.interval-ladder {
  align-items: center;
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 24px;
  position: relative;
}

.interval-ladder span {
  background: white;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--blue-dark);
  font-size: 0.86rem;
  font-weight: 800;
  padding: 10px 8px;
  text-align: center;
}

.forget-note {
  align-items: flex-start;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  gap: 10px;
  margin-top: 14px;
  padding: 13px 14px;
}

.forget-note strong {
  color: var(--navy);
  flex: 0 0 auto;
}

.forget-note span {
  color: var(--muted);
}

.translation-panel {
  max-width: 760px;
}

.translation-panel h2 {
  font-size: clamp(1.75rem, 2.35vw, 2.55rem);
  line-height: 1.12;
}

.translation-panel p:not(.eyebrow) {
  color: var(--muted);
  font-size: 1.05rem;
}

.language-preview {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(220px, 0.8fr) minmax(280px, 1.2fr);
}

.language-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
}

.language-card.active {
  border-color: #bfdbfe;
  box-shadow: 0 12px 34px rgba(37, 99, 235, 0.09);
}

.translation-sample {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr 1fr;
}

.language-card span {
  color: var(--blue);
  display: block;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.language-card strong {
  display: block;
  margin-bottom: 6px;
}

.language-card p {
  color: var(--muted);
  margin: 0;
}

.translated-word {
  font-size: 1.35rem;
  font-weight: 800;
}

.language-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  grid-column: 1 / -1;
  margin-top: 8px;
}

.language-list span {
  background: white;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--navy);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 7px 11px;
}

.grid {
  display: grid;
  gap: 28px;
  grid-template-columns: repeat(3, 1fr);
  margin: 0 auto;
  max-width: 1220px;
}

.grid article {
  border-top: 3px solid var(--accent);
  padding-top: 18px;
}

.page {
  background: white;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin: 48px auto;
  max-width: 860px;
  padding: clamp(28px, 5vw, 56px);
}

.page h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  margin-bottom: 12px;
}

.page section {
  border-top: 1px solid var(--border);
  margin-top: 28px;
  padding-top: 24px;
}

footer {
  color: var(--muted);
  padding: 32px clamp(20px, 5vw, 72px);
}

footer p {
  margin: 0;
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .brand-icon {
    height: 34px;
    width: 34px;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .answer-row {
    gap: 4px;
    grid-template-columns: 1fr;
  }

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

  .memory-loop,
  .loop-steps,
  .review-preview-band,
  .language-band,
  .language-preview,
  .translation-sample {
    grid-template-columns: 1fr;
  }

  .interval-ladder {
    grid-template-columns: repeat(2, 1fr);
  }

}