:root {
  --deep: #050714;
  --space: #0b1026;
  --night: #151b35;
  --purple: #9d4edd;
  --cyan: #4cc9f0;
  --yellow: #ffd60a;
  --pink: #f72585;
  --ink: #f8f9fa;
  --muted: #c0c7d8;
  --glass: rgba(255, 255, 255, .04);
  --line: rgba(255, 255, 255, .08);
  --header: 76px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header) + 12px); }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: Nunito, "Noto Sans SC", sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 12% 18%, rgba(76, 201, 240, .1), transparent 42%),
    radial-gradient(circle at 88% 82%, rgba(157, 78, 221, .12), transparent 46%),
    linear-gradient(180deg, var(--deep), var(--space) 55%, #0e1638);
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button, a { -webkit-tap-highlight-color: transparent; }
h1, h2, h3 { margin: 0; font-weight: 800; letter-spacing: -.03em; line-height: 1.15; }
p { margin: 0; color: var(--muted); }

.skip-link {
  position: fixed; z-index: 200; left: 12px; top: -80px;
  padding: 10px 16px; border-radius: 10px; background: #fff; color: #111;
}
.skip-link:focus { top: 12px; }

.stars, .twinkle { position: fixed; inset: 0; pointer-events: none; }
.stars {
  z-index: -3; opacity: .55;
  background: radial-gradient(#fff, rgba(255,255,255,.25) 1px, transparent 1.6px);
  background-size: 380px 380px;
}
.stars-slow { z-index: -2; opacity: .28; background-size: 240px 240px; animation: drift 80s linear infinite; }
.twinkle {
  z-index: -1;
  background:
    radial-gradient(1.5px 1.5px at 18% 22%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 72% 14%, var(--yellow), transparent),
    radial-gradient(1.5px 1.5px at 86% 64%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 32% 78%, var(--cyan), transparent);
  animation: pulse 4.5s ease-in-out infinite;
}
.orbit { position: fixed; inset: 0; pointer-events: none; z-index: 0; }
.float {
  position: absolute; font-size: 28px; opacity: .28;
  animation: bob 7s ease-in-out infinite;
  filter: drop-shadow(0 8px 12px rgba(0,0,0,.35));
}
.float-a { top: 18%; left: 4%; }
.float-b { top: 28%; right: 6%; animation-delay: .8s; }
.float-c { top: 68%; left: 8%; animation-delay: 1.6s; }
.float-d { top: 74%; right: 10%; animation-delay: 2.2s; }
.float-e { top: 48%; left: 46%; font-size: 22px; animation-delay: 1.1s; }

.shooting-star {
  position: fixed; top: 0; left: 100%; z-index: 0;
  width: 110px; height: 2px;
  background: linear-gradient(90deg, #fff, rgba(255,214,10,.6), transparent);
  border-radius: 50%;
  box-shadow: 0 0 12px #fff, 0 0 22px rgba(76, 201, 240, .6);
  opacity: 0; pointer-events: none;
}
@keyframes shooting-star-anim {
  0% { transform: translate(0, 0) rotate(-42deg); opacity: 1; }
  100% { transform: translate(-820px, 820px) rotate(-42deg); opacity: 0; }
}

@keyframes drift { to { background-position: 380px 380px; } }
@keyframes pulse { 50% { opacity: .45; } }
@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-18px); }
}

.site-header {
  position: sticky; top: 0; z-index: 50; height: var(--header);
  background: rgba(5, 7, 20, .78);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}
.nav-wrap {
  width: min(1180px, calc(100% - 40px));
  height: 100%; margin: auto;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 1.15rem; white-space: nowrap;
}
.brand-logo {
  width: 44px; height: 44px; border-radius: 14px; object-fit: cover;
  box-shadow: 0 6px 18px rgba(0,0,0,.35);
  transition: transform .3s cubic-bezier(.68,-.4,.32,1.4);
}
.brand:hover .brand-logo { transform: rotate(6deg) scale(1.05); }
.site-nav { display: flex; gap: 8px; }
.site-nav a {
  padding: 8px 14px; border-radius: 999px;
  color: var(--muted); font-weight: 700; font-size: 15px;
  border: 1px solid transparent;
}
.site-nav a:hover, .site-nav a:focus-visible, .site-nav a.is-active {
  color: #fff; background: var(--purple); border-color: var(--purple);
  box-shadow: 0 0 16px rgba(157, 78, 221, .35);
}
.nav-toggle {
  display: none; width: 44px; height: 44px; border: 0; border-radius: 14px;
  background: rgba(255,255,255,.08); padding: 11px; cursor: pointer;
}
.nav-toggle span { display: block; height: 2px; margin: 5px 0; background: #fff; border-radius: 2px; }

main { width: min(1180px, calc(100% - 40px)); margin: 0 auto; position: relative; z-index: 1; }
.section { padding: 96px 0 8px; }
.section-heading { max-width: 670px; margin: 0 auto 50px; text-align: center; }
.section-heading h2, .intro-copy h2 {
  font-size: clamp(1.9rem, 3.6vw, 2.8rem); margin-bottom: 14px;
}
.eyebrow {
  margin: 0 0 14px; color: var(--cyan); font-size: 14px; font-weight: 800; letter-spacing: .08em;
}
.hero .eyebrow, .intro-copy .eyebrow { color: var(--yellow); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  gap: 48px; align-items: center; padding: 128px 0 72px;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 4.2rem); margin-bottom: 16px;
  background: linear-gradient(135deg, #fff 10%, var(--cyan));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 22px rgba(76,201,240,.28));
}
.hero-slogan {
  margin: 0 0 12px; color: var(--yellow);
  font-size: clamp(1.15rem, 2vw, 1.45rem); font-weight: 800;
}
.hero-description { max-width: 36em; font-size: 1.05rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 52px; padding: 12px 24px; border-radius: 18px;
  font-weight: 800; border: 1px solid var(--line);
  transition: transform .25s, box-shadow .25s, background .25s;
}
.btn:hover, .btn:focus-visible { transform: translateY(-3px); }
.btn-primary {
  color: #12061f;
  background: linear-gradient(135deg, var(--yellow), #ffe56a);
  box-shadow: 0 12px 28px rgba(255, 214, 10, .22);
}
.btn-primary span { margin-left: 8px; }
.btn-ghost { color: #fff; background: rgba(255,255,255,.06); }
.btn-ghost:hover { border-color: var(--cyan); box-shadow: 0 12px 28px rgba(76,201,240,.18); }

.hero-visual { position: relative; padding: 18px 8px 28px; }
.screenshot-window {
  overflow: hidden; border-radius: 24px;
  background: linear-gradient(145deg, #1a1a2e, #16213e);
  box-shadow: 0 28px 50px rgba(0,0,0,.42), inset 0 1px 0 rgba(255,255,255,.12);
}
.window-bar {
  height: 34px; display: flex; align-items: center; gap: 6px;
  padding: 0 12px; color: #8b93ab; font-size: 11px; font-weight: 700;
}
.window-bar i { width: 8px; height: 8px; border-radius: 50%; background: #ffc954; }
.window-bar i:first-child { background: #ff8c78; }
.window-bar i:nth-child(3) { background: #50c986; }
.window-bar span { margin-inline: auto; transform: translateX(-16px); }
.screenshot-window img { width: 100%; aspect-ratio: 1024 / 473; object-fit: cover; }
.visual-badge {
  position: absolute; display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 15px; border: 1px solid var(--line); border-radius: 17px;
  background: rgba(11, 16, 38, .92); box-shadow: 0 12px 28px rgba(0,0,0,.28);
  color: var(--ink); font-size: 13px; font-weight: 800;
}
.visual-badge b {
  display: grid; place-items: center; width: 29px; height: 29px;
  border-radius: 10px; color: #12061f; background: var(--cyan);
}
.badge-read { left: -10px; bottom: 18px; }
.badge-level { right: 92px; top: 8px; }
.badge-level b { background: var(--yellow); }
.mascot {
  position: absolute; width: 118px; right: -12px; bottom: -6px;
  border-radius: 50%; box-shadow: 0 16px 40px rgba(0,0,0,.4);
  animation: bob 6s ease-in-out infinite;
}

.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feature-card {
  min-height: 230px; padding: 28px 22px; border-radius: 24px; text-align: left;
  background: var(--glass); border: 1px solid var(--line); backdrop-filter: blur(14px);
  transition: transform .3s, border-color .3s, background .3s;
}
.feature-card:hover {
  transform: translateY(-8px); border-color: var(--purple); background: rgba(255,255,255,.06);
}
.feature-icon {
  display: grid; place-items: center; width: 56px; height: 56px; margin-bottom: 22px;
  border-radius: 18px; font-weight: 900; background: rgba(76, 201, 240, .12); color: var(--cyan);
}
.icon-level span { font-size: 13px; letter-spacing: -1px; }
.icon-audio { font-size: 26px; }
.icon-word { color: #845b00; background: rgba(255, 214, 10, .16); font: 900 24px Georgia, serif; }
.icon-speak { background: rgba(247, 37, 133, .14); }
.icon-speak span {
  width: 22px; height: 16px; border-radius: 50%; background: var(--pink); font-size: 0;
}
.feature-card h3 { margin: 0 0 10px; font-size: 1.2rem; }
.feature-card p { font-size: 15px; }

.showcase-row {
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(260px, .75fr);
  gap: 56px; align-items: center; margin: 0 0 88px;
}
.showcase-row:last-child { margin-bottom: 0; }
.showcase-row.is-reversed { grid-template-columns: minmax(260px, .75fr) minmax(0, 1.25fr); }
.showcase-row.is-reversed .showcase-media { order: 2; }
.showcase-row.is-reversed .showcase-copy { order: 1; }
.showcase-media {
  padding: 12px; border-radius: 28px;
  background: linear-gradient(145deg, #1a1a2e, #16213e);
  box-shadow: 0 22px 44px rgba(0,0,0,.35);
}
.showcase-media img { width: 100%; border-radius: 18px; aspect-ratio: 1024 / 473; object-fit: cover; }
.showcase-copy { position: relative; }
.step-number {
  position: absolute; right: 0; top: -22px;
  color: rgba(157, 78, 221, .28); font-size: 76px; font-weight: 900; line-height: 1;
}
.mini-label { margin: 0 0 8px; color: var(--cyan); font-size: 14px; font-weight: 800; }
.showcase-copy h3 { position: relative; margin: 0 0 14px; font-size: clamp(1.6rem, 3vw, 2.3rem); }
.showcase-copy > p:not(.mini-label) { position: relative; margin: 0 0 22px; font-size: 16px; }
.detail-chip {
  display: inline-flex; padding: 7px 13px; border-radius: 999px;
  color: var(--yellow); background: rgba(255,214,10,.1);
  border: 1px solid rgba(255,214,10,.22); font-size: 13px; font-weight: 700;
}

.intro-card {
  display: grid; grid-template-columns: 220px 1fr; gap: 28px; align-items: center;
  overflow: hidden; border-radius: 32px; padding: 28px 40px 28px 28px;
  background: radial-gradient(circle at 82% 0, rgba(157,78,221,.22), transparent 55%), var(--glass);
  border: 1px solid var(--line);
}
.intro-mascot {
  width: 220px; height: 220px; object-fit: cover; border-radius: 28px;
  box-shadow: 0 18px 36px rgba(0,0,0,.35);
}
.intro-copy { max-width: 720px; }

.site-footer {
  margin-top: 56px; padding: 42px 0 24px;
  border-top: 1px solid var(--line); background: rgba(5,7,20,.7);
}
.footer-inner, .copyright {
  width: min(1180px, calc(100% - 40px)); margin: 0 auto;
}
.footer-inner { display: flex; justify-content: space-between; gap: 28px; padding-bottom: 28px; }
.footer-brand p { margin-top: 12px; max-width: 28em; font-size: 14px; }
.footer-contact { display: flex; flex-direction: column; gap: 6px; color: var(--muted); }
.footer-contact a { color: #fff; font-size: 16px; }
.footer-contact a:hover, .copyright a:hover { color: var(--cyan); }
.copyright {
  display: flex; justify-content: space-between; gap: 16px;
  padding-top: 18px; border-top: 1px solid var(--line);
  color: #8b93ab; font-size: 13px;
}

.to-top {
  position: fixed; right: 18px; bottom: 18px; z-index: 40;
  width: 46px; height: 46px; border: 1px solid var(--line); border-radius: 50%;
  background: rgba(21,27,53,.9); color: #fff; font-size: 18px; cursor: pointer;
  opacity: 0; visibility: hidden; transition: opacity .2s, transform .2s;
}
.to-top.is-on { opacity: 1; visibility: visible; }
.to-top:hover { transform: translateY(-3px); border-color: var(--cyan); }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; padding-top: 96px; }
  .hero-copy { text-align: center; }
  .hero-description { margin-inline: auto; }
  .hero-actions { justify-content: center; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .showcase-row, .showcase-row.is-reversed { gap: 32px; }
  .mascot { width: 96px; }
  .badge-level { right: 8px; }
}

@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-7px) rotate(-45deg); }
  .site-nav {
    position: absolute; top: calc(100% + 8px); left: 16px; right: 16px;
    display: grid; padding: 10px; border-radius: 18px;
    background: rgba(11,16,38,.96); border: 1px solid var(--line);
    opacity: 0; visibility: hidden; transform: translateY(-8px);
  }
  .site-nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .section { padding-top: 72px; }
  .feature-grid { grid-template-columns: 1fr; }
  .showcase-row, .showcase-row.is-reversed { grid-template-columns: 1fr; margin-bottom: 64px; }
  .showcase-row .showcase-media, .showcase-row.is-reversed .showcase-media { order: 1; }
  .showcase-row .showcase-copy, .showcase-row.is-reversed .showcase-copy { order: 2; }
  .intro-card { grid-template-columns: 1fr; justify-items: center; text-align: center; padding: 28px 22px; }
  .footer-inner, .copyright { flex-direction: column; align-items: center; text-align: center; }
  .float-b, .float-e { display: none; }
}

@media (max-width: 500px) {
  main, .nav-wrap, .footer-inner, .copyright { width: min(100% - 28px, 1180px); }
  .hero h1 { font-size: 2rem; }
  .window-bar span { display: none; }
  .visual-badge { padding: 7px 10px; font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}