:root {
  color-scheme: light;
  --ink: #12243c;
  --muted: #5d6d80;
  --paper: #fbfcff;
  --blue: #386cff;
  --blue-dark: #234fd8;
  --aqua: #35c8bd;
  --violet: #7658f6;
  --line: #dfe6f1;
  --card: rgba(255, 255, 255, 0.84);
  --shadow: 0 22px 50px rgba(29, 60, 112, 0.12);
  font-family:
    Inter,
    ui-sans-serif,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.58;
}

body::before,
body::after {
  position: fixed;
  z-index: -2;
  width: min(72vw, 720px);
  aspect-ratio: 1;
  content: "";
  pointer-events: none;
  filter: blur(2px);
  opacity: 0.82;
}

body::before {
  top: -28vw;
  left: -24vw;
  background: radial-gradient(
    circle at 58% 58%,
    rgba(84, 127, 255, 0.23),
    rgba(113, 77, 246, 0.08) 43%,
    transparent 70%
  );
}

body::after {
  right: -31vw;
  bottom: -30vw;
  background: radial-gradient(
    circle at 42% 42%,
    rgba(53, 200, 189, 0.24),
    rgba(52, 108, 255, 0.06) 44%,
    transparent 70%
  );
}

a {
  color: var(--blue-dark);
}
a:hover {
  color: #1739a9;
}

:focus-visible {
  outline: 3px solid #ffb84b;
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 0.75rem;
  left: 0.75rem;
  transform: translateY(-200%);
  padding: 0.65rem 0.8rem;
  border-radius: 0.6rem;
  color: #fff;
  background: var(--ink);
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  z-index: 5;
  top: 0;
  border-bottom: 1px solid rgba(223, 230, 241, 0.82);
  background: rgba(251, 252, 255, 0.78);
  backdrop-filter: blur(16px);
}

.header-inner {
  display: flex;
  min-height: 4.6rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.62rem;
  color: var(--ink);
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border-radius: 0.72rem;
  color: #fff;
  background: linear-gradient(145deg, #527fff, #6a50ee);
  box-shadow: 0 8px 18px rgba(58, 91, 214, 0.3);
  font-size: 0.88rem;
  font-weight: 900;
}

.menu-toggle {
  display: none;
  padding: 0.42rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  color: var(--ink);
  background: #fff;
  font: inherit;
  font-weight: 700;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.site-nav a {
  padding: 0.48rem 0.65rem;
  border-radius: 0.55rem;
  color: #45576d;
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
}

.site-nav a[aria-current="page"],
.site-nav a:hover {
  color: var(--blue-dark);
  background: rgba(56, 108, 255, 0.08);
}

main {
  min-height: calc(100vh - 10rem);
}

.hero {
  padding: clamp(4.2rem, 10vw, 8.2rem) 0 clamp(3.7rem, 8vw, 6.4rem);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 6.5rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0 0 1rem;
  color: #395dc4;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 0.52rem;
  height: 0.52rem;
  border-radius: 50%;
  background: var(--aqua);
  content: "";
  box-shadow: 0 0 0 4px rgba(53, 200, 189, 0.12);
}

h1,
h2,
h3 {
  line-height: 1.12;
  letter-spacing: -0.045em;
}
h1 {
  max-width: 13ch;
  margin: 0;
  font-size: clamp(2.7rem, 6.2vw, 5.1rem);
}
h2 {
  margin: 0;
  font-size: clamp(1.65rem, 3.2vw, 2.45rem);
}
h3 {
  margin: 0;
  font-size: 1.08rem;
}

.lead {
  max-width: 59ch;
  margin: 1.45rem 0 0;
  color: var(--muted);
  font-size: clamp(1.06rem, 2vw, 1.23rem);
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.7rem;
}

.button {
  display: inline-flex;
  min-height: 2.9rem;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1rem;
  border: 1px solid transparent;
  border-radius: 0.78rem;
  color: #fff;
  background: var(--blue);
  box-shadow: 0 11px 21px rgba(48, 91, 219, 0.19);
  font-weight: 800;
  text-decoration: none;
}

.button:hover {
  color: #fff;
  background: var(--blue-dark);
}
.button.secondary {
  color: var(--blue-dark);
  border-color: #cbd8ff;
  background: rgba(255, 255, 255, 0.65);
  box-shadow: none;
}
.button.secondary:hover {
  background: #edf2ff;
}

.word-card {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 2.3rem);
  border: 1px solid rgba(211, 221, 241, 0.9);
  border-radius: 1.5rem;
  background: linear-gradient(
    155deg,
    rgba(255, 255, 255, 0.96),
    rgba(246, 248, 255, 0.8)
  );
  box-shadow: var(--shadow);
}

.word-card::before {
  position: absolute;
  width: 14rem;
  height: 14rem;
  top: -8rem;
  right: -6rem;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(100, 81, 240, 0.22),
    transparent 67%
  );
  content: "";
}

.card-label {
  margin: 0;
  color: #5971a0;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.card-word {
  position: relative;
  margin: 1rem 0 0.2rem;
  font-size: clamp(2.3rem, 5vw, 3.55rem);
  font-weight: 850;
  letter-spacing: -0.06em;
}
.card-phonetic {
  margin: 0;
  color: #6b7d94;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.93rem;
}
.card-translation {
  margin: 1.8rem 0 0;
  color: #203a5b;
  font-size: 1.05rem;
  font-weight: 700;
}
.card-rule {
  height: 1px;
  margin: 1.4rem 0;
  background: #e2e8f4;
}
.card-hint {
  margin: 0;
  color: #617287;
  font-size: 0.95rem;
}

.section {
  padding: clamp(3.5rem, 7vw, 6.2rem) 0;
}
.section-tint {
  border-top: 1px solid rgba(218, 226, 240, 0.7);
  border-bottom: 1px solid rgba(218, 226, 240, 0.7);
  background: rgba(238, 244, 255, 0.46);
}
.section-heading {
  max-width: 48rem;
}
.section-heading p {
  margin: 0.9rem 0 0;
  color: var(--muted);
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.feature {
  padding: 1.35rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--card);
}

.feature-icon {
  display: grid;
  width: 2.45rem;
  height: 2.45rem;
  place-items: center;
  border-radius: 0.75rem;
  color: #315fd8;
  background: #eaf0ff;
  font-size: 1.15rem;
}
.feature h3 {
  margin-top: 1rem;
}
.feature p {
  margin: 0.6rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.callout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: clamp(1.25rem, 4vw, 2rem);
  border: 1px solid #ccd9ff;
  border-radius: 1.2rem;
  background: linear-gradient(125deg, #edf3ff, #f7f3ff);
}
.callout p {
  max-width: 58ch;
  margin: 0.35rem 0 0;
  color: #52657b;
}

.page-hero {
  padding: clamp(3rem, 7vw, 5.4rem) 0 2.8rem;
}
.page-hero h1 {
  max-width: 18ch;
  font-size: clamp(2.45rem, 5vw, 4.25rem);
}
.page-hero .lead {
  margin-top: 1rem;
}

.article {
  width: min(770px, 100%);
  padding-bottom: clamp(4rem, 8vw, 7rem);
}
.article h2 {
  margin-top: 2.9rem;
  font-size: clamp(1.45rem, 3vw, 2.1rem);
}
.article h3 {
  margin-top: 1.55rem;
}
.article p,
.article li {
  color: #45566b;
}
.article p {
  margin: 0.9rem 0;
}
.article ul,
.article ol {
  padding-left: 1.3rem;
}
.article li + li {
  margin-top: 0.45rem;
}
.article .quiet {
  color: #6c7b8c;
  font-size: 0.93rem;
}

.notice {
  padding: 1.1rem 1.2rem;
  border-left: 4px solid var(--blue);
  border-radius: 0 0.8rem 0.8rem 0;
  background: #edf3ff;
  color: #365179;
}

.steps {
  counter-reset: steps;
  display: grid;
  gap: 0.9rem;
  margin: 1.6rem 0 2rem;
}
.step {
  position: relative;
  padding: 1.05rem 1.15rem 1.05rem 4rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: var(--card);
}
.step::before {
  position: absolute;
  top: 1.05rem;
  left: 1.1rem;
  display: grid;
  width: 1.9rem;
  height: 1.9rem;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--blue);
  content: counter(steps);
  counter-increment: steps;
  font-size: 0.85rem;
  font-weight: 800;
}
.step h3 {
  margin: 0;
}
.step p {
  margin: 0.35rem 0 0;
}

.support-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 0.72fr);
  gap: 1.4rem;
  align-items: start;
}
.support-card {
  padding: clamp(1.35rem, 4vw, 2rem);
  border: 1px solid #d8e2f4;
  border-radius: 1.15rem;
  background: var(--card);
  box-shadow: 0 12px 26px rgba(37, 67, 115, 0.06);
}
.support-card h2 {
  font-size: 1.55rem;
}
.support-card p {
  color: var(--muted);
}
.email-link {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  margin-top: 0.4rem;
  overflow-wrap: anywhere;
  color: var(--blue-dark);
  font-size: clamp(1rem, 2.5vw, 1.24rem);
  font-weight: 800;
}

.site-footer {
  padding: 2.2rem 0 2.7rem;
  border-top: 1px solid var(--line);
  color: #67798f;
  font-size: 0.9rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 1.5rem;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}
.footer-links a {
  color: #4e6178;
}

@media (max-width: 760px) {
  .header-inner {
    min-height: 4.25rem;
  }
  .menu-toggle {
    display: inline-flex;
  }
  .site-nav {
    position: absolute;
    top: calc(100% + 0.4rem);
    right: 1rem;
    left: 1rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 0.45rem;
    border: 1px solid var(--line);
    border-radius: 0.85rem;
    background: #fff;
    box-shadow: var(--shadow);
  }
  .site-nav[data-open="true"] {
    display: flex;
  }
  .site-nav a {
    padding: 0.7rem;
  }
  .hero-grid,
  .support-grid {
    grid-template-columns: 1fr;
  }
  .word-card {
    max-width: 32rem;
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .callout {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}