:root {
  --paper: #eef1ff;
  --sheet: #ffffff;
  --text: #1b1a2e;
  --muted: #5b5d78;
  --line: #1b1a2e;
  --blue: #1f6feb;
  --red: #ea4335;
  --yellow: #fbbc05;
  --green: #34a853;
  --note: #ffe27a;
  --font: system-ui, -apple-system, "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic",
    "Hiragino Sans", "Yu Gothic", "PingFang SC", "PingFang TC", "Microsoft YaHei",
    "Microsoft JhengHei", "Noto Sans CJK KR", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #12131f;
    --sheet: #1d2036;
    --text: #eef0ff;
    --muted: #a6a9c8;
    --line: #8388d8;
    --blue: #5b9bff;
    --note: #4a3d12;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }
html[lang="ko"] body { word-break: keep-all; }
html[lang="ja"] body { word-break: auto-phrase; line-break: strict; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font: 17px/1.7 var(--font);
}

.wrap { max-width: 880px; margin: 0 auto; padding: 0 16px; }

.sr {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

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

/* header */
.top { display: flex; align-items: center; justify-content: space-between; padding-top: 20px; padding-bottom: 8px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 800; font-size: 1.1rem; }
.brand img { border: 2px solid var(--line); border-radius: 10px; }
.lang select {
  font: inherit; font-size: .9rem; color: var(--text); background: var(--sheet);
  border: 2px solid var(--line); border-radius: 999px; padding: 6px 14px;
}

/* hero */
.hero { padding-top: 40px; padding-bottom: 28px; }
h1 {
  margin: 0 0 16px; font-size: clamp(2.1rem, 6.4vw, 3.6rem); line-height: 1.16;
  font-weight: 800; letter-spacing: -0.03em; white-space: pre-line;
}
.lead { margin: 0 0 24px; max-width: 34em; color: var(--muted); font-size: 1.05rem; }

.btn {
  display: inline-block; background: var(--blue); color: #fff; text-decoration: none;
  font-weight: 800; padding: 12px 26px; border: 3px solid var(--line); border-radius: 999px;
  box-shadow: 4px 4px 0 var(--line); transition: transform .12s, box-shadow .12s;
}
.btn:hover { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--line); }
.btn.off { background: var(--sheet); color: var(--muted); box-shadow: none; cursor: default; }
.btn.off:hover { transform: none; }

/* demo sticker */
.sticker {
  background: var(--sheet); border: 3px solid var(--line); border-radius: 24px;
  box-shadow: 8px 8px 0 var(--line);
}
.demo { position: relative; padding: 62px 24px 24px; margin-bottom: 20px; }
.dog {
  position: absolute; top: -34px; right: 18px; width: 84px; height: 84px;
  border: 3px solid var(--line); border-radius: 20px; background: var(--sheet);
  box-shadow: 4px 4px 0 var(--line); transform: rotate(8deg);
  animation: peek .7s cubic-bezier(.2, .9, .3, 1.2) both;
}
@keyframes peek {
  from { transform: translateY(30px) rotate(8deg); opacity: 0; }
  to { transform: translateY(0) rotate(8deg); opacity: 1; }
}
#demo-input {
  width: 100%; font: inherit; font-size: 1.05rem; color: var(--text); background: var(--paper);
  border: 3px solid var(--line); border-radius: 14px; padding: 10px 14px;
}
#demo-input::placeholder { color: var(--muted); }
.stage {
  display: flex; align-items: center; justify-content: center; min-height: 150px;
  padding: 16px 8px 4px; font-weight: 600; letter-spacing: -0.02em; line-height: 1.2; text-align: center;
  overflow-wrap: anywhere;
}
.bar {
  width: min(520px, 92%); height: 44px; margin: 6px auto 14px;
  border: 3px solid var(--line); border-radius: 999px; background: var(--sheet); opacity: .85;
}
.note { margin: 0; color: var(--muted); font-size: .92rem; }
.chips-title { margin: 22px 0 10px; font-size: 1.05rem; font-weight: 800; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 10px; }
.chip {
  font: inherit; font-weight: 700; color: var(--text); background: var(--paper);
  border: 3px solid var(--line); border-radius: 999px; padding: 6px 16px; cursor: pointer;
  transition: transform .12s, background .12s;
}
.chip:hover { background: var(--note); transform: translateY(-2px); }

/* sections */
section.block { padding: 36px 0 8px; }
h2 { margin: 0 0 14px; font-size: 1.6rem; line-height: 1.25; font-weight: 800; letter-spacing: -0.02em; }

.rows { margin: 0; padding: 0; list-style: none; }
.rows li {
  display: grid; grid-template-columns: 64px 1fr; gap: 18px; padding: 20px 0;
  border-top: 2px solid var(--line);
}
.rows li:last-child { border-bottom: 2px solid var(--line); }
.glyph {
  width: 64px; height: 64px; display: grid; place-items: center; border: 3px solid var(--line);
  border-radius: 50%; background: var(--sheet); box-shadow: 3px 3px 0 var(--line); color: var(--text);
}
.rows li:nth-child(1) .glyph { background: var(--blue); color: #fff; }
.rows li:nth-child(2) .glyph { background: var(--yellow); color: #1b1a2e; }
.rows li:nth-child(3) .glyph { background: var(--green); color: #fff; }
.glyph svg { width: 30px; height: 30px; fill: none; stroke: currentColor; stroke-width: 2.6; stroke-linecap: round; stroke-linejoin: round; }
.rows h3 { margin: 0 0 4px; font-size: 1.15rem; font-weight: 800; }
.rows p { margin: 0; color: var(--muted); }
.after { margin: 14px 0 0; color: var(--muted); }

ol.steps { margin: 0; padding: 0; list-style: none; counter-reset: s; }
ol.steps li { counter-increment: s; display: grid; grid-template-columns: 44px 1fr; gap: 16px; padding: 8px 0; align-items: start; }
ol.steps li::before {
  content: counter(s); width: 44px; height: 44px; display: grid; place-items: center;
  font-weight: 800; border: 3px solid var(--line); border-radius: 50%; background: var(--sheet);
}

.callout { background: var(--note); padding: 22px 24px; }
.callout ul { margin: 0; padding-left: 1.2em; }
.callout li { margin: 6px 0; }
.callout h2 { margin-bottom: 8px; }

details { border-top: 2px solid var(--line); padding: 14px 0; }
details:last-of-type { border-bottom: 2px solid var(--line); }
summary { cursor: pointer; font-weight: 800; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-size: 1.4rem; line-height: 1; }
details[open] summary::after { content: "−"; }
details p { margin: 10px 0 0; color: var(--muted); }

footer.wrap {
  margin-top: 64px; padding-top: 24px; padding-bottom: 48px; color: var(--muted); font-size: .9rem;
  background: linear-gradient(var(--line), var(--line)) 16px 0 / calc(100% - 32px) 3px no-repeat;
}
details:last-of-type { border-bottom: 0; }
footer a { font-weight: 700; }
footer p { margin: 8px 0 0; max-width: 46em; }

/* privacy */
.doc { padding-top: 24px; }
.doc h1 { font-size: clamp(1.9rem, 5vw, 2.8rem); }
.doc .meta { color: var(--muted); margin: 0 0 12px; }
.doc section { padding: 18px 0 4px; }
.doc h2 { font-size: 1.25rem; margin-bottom: 6px; }
.doc p { margin: 0 0 10px; max-width: 42em; }
.doc code { font-family: ui-monospace, Menlo, Consolas, monospace; background: var(--sheet); border: 2px solid var(--line); border-radius: 6px; padding: 0 6px; font-size: .9em; }
.todo { background: var(--note); border: 2px dashed var(--line); padding: 0 6px; border-radius: 6px; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .demo { padding: 52px 16px 20px; }
  .dog { width: 64px; height: 64px; top: -28px; right: 12px; border-radius: 16px; }
  .rows li { grid-template-columns: 52px 1fr; gap: 14px; }
  .glyph { width: 52px; height: 52px; }
  .stage { min-height: 120px; }
}

@media (prefers-reduced-motion: reduce) {
  .dog { animation: none; }
  .btn, .chip { transition: none; }
}