:root {
  --blue: #3aa2e9;
  --blue-mid: #3da9e7;
  --teal: #79c4d2;
  --ink: #212631;
  --ink-soft: #333d4d;
  --sub: #6b7380;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro", "SF Pro Text", "Apple SD Gothic Neo", "Hiragino Sans", "Noto Sans KR", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  overflow-x: hidden;
}

body {
  font-family: var(--font);
  color: #fff;
  background: var(--blue);
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
  overflow-x: hidden;
}
/* Japanese has no spaces between words, so keep-all would never wrap it */
html[lang="ja"] body { word-break: normal; line-break: strict; }
html[lang="ja"] .intro h1, html[lang="ja"] .intro p { text-wrap: balance; }

a { color: inherit; text-decoration: none; }

/* ---------- Nav ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: calc(24px + env(safe-area-inset-top)) 56px 24px;
  isolation: isolate;
  transition: padding .25s;
}
/* backdrop that fades in with scroll (--nav-fade 0..1) and dissolves toward its lower edge */
.nav::before {
  content: ""; position: absolute; inset: 0 0 -36px 0; z-index: -1; pointer-events: none;
  background: linear-gradient(180deg, rgba(58, 162, 233, 0.6) 0%, rgba(58, 162, 233, 0) 100%);
  backdrop-filter: blur(16px) saturate(1.2); -webkit-backdrop-filter: blur(16px) saturate(1.2);
  -webkit-mask-image: linear-gradient(180deg, #000 45%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 45%, transparent 100%);
  opacity: var(--nav-fade, 0);
}
.nav.is-scrolled { padding-top: 14px; padding-bottom: 14px; }
.nav__logo img { display: block; width: 112px; height: auto; }
.menu {
  display: flex; gap: 4px; padding: 6px;
  border-radius: 999px;
}
.menu a {
  /* fixed height + min-width = height: a short label like 홈 becomes a perfect circle */
  display: inline-flex; align-items: center; justify-content: center;
  height: 40px; min-width: 40px; padding: 0 12px; border-radius: 999px;
  font-size: 15px; font-weight: 500; color: #fff;
  white-space: nowrap;
  transition: background .2s, color .2s;
}
.menu a:hover { background: rgba(58, 162, 233, 0.12); }
.menu a[aria-current="page"] { background: #fff; color: var(--blue); font-weight: 600; }

.nav__right { position: relative; display: flex; align-items: center; gap: 14px; }
.more { display: none; }
.lang {
  position: relative;
  width: 20px; height: 20px; padding: 0; border: 0; border-radius: 50%;
  background: none; cursor: pointer; flex: none;
  box-shadow: 0 0 0 2px #fff;
  transition: transform .2s;
}
/* invisible 44px tap target around the small flag */
.lang::after { content: ""; position: absolute; inset: -12px; }
.lang:hover { transform: scale(1.08); }
.lang__flag { display: block; width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
html[lang="ko"] .lang__flag--ja, html[lang="ja"] .lang__flag--ko { display: none; }

/* ---------- Home hero ---------- */
/* copy on top, phone centred below it; the phone's lower part runs past the fold */
.hero {
  position: relative;
  height: 100vh; height: 100svh; min-height: 760px;
  overflow: clip;
  display: flex; flex-direction: column; align-items: center;
  padding: 140px 24px 0;
  text-align: center;
}
.intro { position: relative; z-index: 2; max-width: 720px; }
.intro h1 {
  font-size: 44px; font-weight: 700; line-height: 1.28; letter-spacing: -0.01em;
}
.intro p { margin-top: 20px; font-size: 19px; line-height: 1.6; }

/* store buttons (Figma "Buttons" layout): 120x50 black rounded rectangles, white icon and 16px Google Sans Flex label, 8px icon gap */
.stores { display: flex; justify-content: center; align-items: center; gap: 16px; margin-top: 28px; }
.store {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  width: 120px; height: 50px; padding: 8px 16px; border-radius: 16px;
  background: #000; color: #fff;
  font: 500 16px/20px "Google Sans Flex", var(--font);
  transition: background .2s, transform .2s;
}
.store:hover { background: #1f1f1f; transform: translateY(-2px); }
.store__icon { display: block; flex: none; }

.stage { --s: 1; position: relative; width: 100%; flex: 1; margin-top: 70px; }
.copyright {
  /* stood on its side along the right edge, reading top to bottom */
  position: absolute; right: 56px; bottom: 24px; z-index: 3;   /* right edge lines up with the nav padding */
  writing-mode: vertical-rl; text-orientation: mixed; letter-spacing: 0.06em;
  font-size: 11px; color: rgba(255, 255, 255, 0.7);
}
.bg-logo {
  position: absolute; left: 50%; top: calc(333px * var(--s));   /* concentric with the phone: half the phone's height */
  width: calc(738px * var(--ls, var(--s))); max-width: none; opacity: 0.7;
  transform: translate(-50%, -50%);
  will-change: transform; pointer-events: none;
}
/* very slight overall softness so the logo sits behind the phone */
.bg-logo img { display: block; width: 100%; height: auto; filter: blur(3px) contrast(0.6) brightness(1.25) saturate(0.8); }   /* bright, milky haze: flatten first, then lift so whites stay white */

/* ---------- 3D phone ---------- */
.phone-wrap {
  position: absolute; left: 50%; top: 0;
  width: 317px; height: 667px;
  margin-left: -158px;
  transform-origin: 50% 0;
  /* rotating about the top swings the phone's middle ~35px right; shift back so its centre sits on the page centre */
  transform: scale(var(--s)) translateX(-35px) rotate(-6deg);
  perspective: 1400px;
}
.phone {
  position: relative; width: 100%; height: 100%;
  transform-style: preserve-3d;
  will-change: transform;
}
.phone__layer, .phone__front {
  position: absolute; inset: 0; border-radius: 54px;
}
/* stacked slices give the body its thickness */
.phone__layer { background: #2a2e35; }
.phone__layer--back { background: #15171b; box-shadow: 0 40px 80px rgba(13, 51, 102, 0.35), 0 8px 20px rgba(0, 0, 0, 0.18); }
.phone__front {
  background: #17191e; padding: 10px;
  box-shadow: inset 0 0 0 1.5px rgba(255, 255, 255, 0.08);
}
.screen {
  position: relative; width: 100%; height: 100%;
  border-radius: 44px; overflow: hidden;
  background: #3aa2e9;
  display: flex; flex-direction: column; align-items: center;
}
.status {
  width: 100%; display: flex; justify-content: space-between; align-items: center;
  padding: 17px 26px 0 38px; font-size: 13px; font-weight: 600;
}
.status svg { display: block; }
.screen__logo { width: 121px; margin-top: 214px; }
.screen__title { margin-top: auto; font-size: 16px; font-weight: 700; color: #efefef; }
.screen__sub { margin: 6px 0 110px; font-size: 10.5px; color: #efefef; }
.glare {
  position: absolute; inset: 0; border-radius: 44px; pointer-events: none;
  background: radial-gradient(circle at var(--gx, 30%) var(--gy, 20%), rgba(255,255,255,0.28), rgba(255,255,255,0) 55%);
  mix-blend-mode: soft-light;
}

/* WebGL phone: canvas is larger than the phone so the tilt has room; phone top sits at the stage top */
.phone3d {
  position: absolute; left: 50%; top: -47px;
  width: 720px; height: 760px; margin-left: -360px;
  transform-origin: 50% 47px;
  transform: scale(var(--s)) translateX(-35px) rotate(-6deg);   /* askew, centre kept on the page centre */
  display: none; pointer-events: none;
}
.phone3d canvas { display: block; width: 100%; height: 100%; }
.has-3d .phone3d { display: block; }
.has-3d .phone-wrap { display: none; }

/* ---------- Document pages ---------- */
/* same blue background as home, white text throughout */
.doc-hero { padding: 168px 24px 56px; }
.doc-hero__inner { max-width: 736px; margin: 0 auto; }
.doc-hero h1 { font-size: 44px; font-weight: 700; line-height: 1.25; letter-spacing: -0.01em; }
.doc-hero .date { margin-top: 12px; font-size: 15px; opacity: 0.85; }

.doc { max-width: 736px; margin: 0 auto; padding: 8px 0 120px; color: #fff; }
.doc__lead { font-size: 16px; line-height: 1.8; }
.doc__lead p + p { margin-top: 8px; }
.doc section { margin-top: 48px; }
.doc h2 { font-size: 21px; font-weight: 700; line-height: 1.4; }
.doc h3 { margin-top: 24px; font-size: 16px; font-weight: 600; }
.doc section p { margin-top: 12px; font-size: 16px; line-height: 1.8; }
.doc ul { margin-top: 12px; padding-left: 1.2em; }
.doc li { font-size: 16px; line-height: 1.8; }
.doc li::marker { color: rgba(255, 255, 255, 0.7); }
.doc .note {
  margin-top: 20px; padding: 14px 18px; border-radius: 12px;
  background: rgba(255, 255, 255, 0.16); font-size: 14px; line-height: 1.7;
}
.doc__copyright {
  margin-top: 56px; text-align: left;
  font-size: 11px; letter-spacing: 0.06em; color: rgba(255, 255, 255, 0.7);
}
.doc__body { display: none; }
html[lang="ko"] .doc__body[data-lang="ko"], html[lang="ja"] .doc__body[data-lang="ja"] { display: block; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .nav { padding: calc(16px + env(safe-area-inset-top)) 24px 16px; }
  .nav.is-scrolled { padding-top: 10px; padding-bottom: 10px; }
  .nav__logo img { width: 92px; }
  .copyright { right: 24px; }   /* same gutter as the nav */
  .menu a { height: 32px; min-width: 32px; padding: 0 9px; font-size: 13px; }
  .hero { padding: 110px 40px 0; min-height: 680px; }
  .intro h1 { font-size: 28px; }
  .intro p { font-size: 16px; }
  .stage { margin-top: 92px; }
  .bg-logo { width: calc(590px * var(--ls, var(--s))); }
  .doc-hero { padding: 120px 28px 32px; }
  .doc-hero h1 { font-size: 30px; }
  .doc { padding: 0 28px 80px; }
  .doc section { margin-top: 40px; }
  .doc h2 { font-size: 18px; }
  .doc h3 { font-size: 15px; }
  .doc__lead, .doc section p, .doc li { font-size: 15px; line-height: 1.75; }
  .doc .note { font-size: 13px; }
  .doc__copyright { margin-top: 40px; font-size: 10px; }
}
/* phones only (same 600px line the phone-size rule in main.js uses) */
@media (max-width: 600px) {
  .stage { margin-top: 56px; }   /* extra room for the tilted corner */
  .copyright { font-size: 9px; }

  /* menu collapses behind a "more" button */
  .more {
    display: grid; place-items: center; width: 36px; height: 36px; padding: 0; border: 0; border-radius: 50%;
    background: rgba(255, 255, 255, 0.22); color: #fff; cursor: pointer;
  }
  .more__close, .nav.is-open .more__dots { display: none; }
  .nav.is-open .more__close { display: block; }
  /* flag matches the 36px more button: 32px flag + the 2px white ring on each side = 36px */
  .lang { width: 32px; height: 32px; }
  .lang::after { inset: -6px; }   /* 44px tap target */
  .menu {
    display: none; position: absolute; top: calc(100% + 10px); right: 0;
    flex-direction: column; align-items: stretch; gap: 2px; min-width: 190px; padding: 8px;
    border-radius: 18px; background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 16px 40px rgba(13, 51, 102, 0.25);
  }
  .nav.is-open .menu { display: flex; }
  .menu a, html[lang="ja"] .menu a {
    justify-content: flex-start; height: 44px; min-width: 0; padding: 0 14px;
    border-radius: 12px; font-size: 15px; color: var(--blue);
  }
  .menu a:hover { background: rgba(58, 162, 233, 0.1); }
  /* matches the specificity of the html[lang=...] rule above, so the white text is not overridden */
  html .menu a[aria-current="page"], html[lang="ja"] .menu a[aria-current="page"] { background: var(--blue); color: #fff; }
}
@media (max-width: 420px) {
  .nav { padding: calc(12px + env(safe-area-inset-top)) 24px 12px; }
  .nav__logo img { width: 78px; }
  .nav { gap: 8px; }
  .nav__right { gap: 14px; }
  .intro h1 { font-size: 24px; }
  .intro h1 br { display: none; }
}