/* Design A "Calm", same tokens as the app (core/ui/Color.kt): cream base, white cards,
   one green accent, yellow highlighter behind the captured word. */

@font-face {
  font-family: "Figtree";
  src: url("assets/figtree.ttf") format("truetype");
  font-weight: 300 900;
  font-display: swap;
}

:root {
  --ground: #F6F3EC;
  --card: #FFFFFF;
  --raised: #EFEBE2;
  --ink: #1D1C19;
  --ink-muted: #5E5A52;
  --divider: #E3DED3;
  --border: #D6D0C3;
  --outline: #8A8478;
  --marker: #FFE27A;
  --warning: #FCEBC8;
  --on-warning: #6B4500;

  --primary: #1E6B4A;
  --on-primary: #FFFFFF;
  --container: #DCEFE3;
  --on-container: #0F3D29;
  --error: #A3362F;

  --radius-chip: 12px;
  --radius-btn: 16px;
  --radius-card: 20px;
  --radius-sheet: 28px;
  --shadow: 0 1px 2px rgba(29, 28, 25, .06), 0 8px 24px rgba(29, 28, 25, .06);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #161512;
    --card: #221F1B;
    --raised: #2C2924;
    --ink: #F1EDE4;
    --ink-muted: #ABA597;
    --divider: #3A362F;
    --border: #4A453C;
    --outline: #8A8478;
    --marker: #6B5513;
    --warning: #4A3510;
    --on-warning: #F5D9A0;

    --primary: #6FCF9A;
    --on-primary: #0B2A1C;
    --container: #1F3A2C;
    --on-container: #CFE8DA;
    --error: #F2A69F;

    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: "Figtree", system-ui, -apple-system, "Segoe UI", Roboto,
    "Noto Sans JP", "Noto Sans KR", "Hiragino Sans", "Apple SD Gothic Neo", sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

[lang="ja"] { font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif; }
[lang="ko"] { font-family: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif; }

a { color: var(--primary); text-underline-offset: 3px; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; margin: 0; }
h2 { font-size: clamp(28px, 4vw, 38px); font-weight: 800; margin-bottom: 28px; }
h3 { font-size: 19px; font-weight: 700; margin-bottom: 8px; }
p { margin: 0; }
.muted { color: var(--ink-muted); }
.center { text-align: center; }

.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 640px) { .wrap { padding: 0 32px; } }
.narrow { max-width: 760px; }

/* Header */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--ground) 88%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid transparent; }
.top-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none;
  font-weight: 800; font-size: 20px; letter-spacing: -0.02em; }
.top-link { font-weight: 600; text-decoration: none; padding: 10px 4px; }

/* Hero */
.hero { padding: 32px 0 72px; }
@media (min-width: 900px) { .hero { padding: 56px 0 96px; } }
.hero-grid { display: grid; gap: 48px; align-items: center; }
@media (min-width: 900px) { .hero-grid { grid-template-columns: 1.1fr .9fr; gap: 64px; } }

.eyebrow { display: inline-block; font-size: 14px; font-weight: 600; color: var(--on-container);
  background: var(--container); padding: 4px 12px; border-radius: 999px; margin-bottom: 20px; }
h1 { font-size: clamp(36px, 6vw, 60px); font-weight: 800; letter-spacing: -0.03em; margin-bottom: 20px; }
.mark { background: linear-gradient(transparent 55%, var(--marker) 55%); padding: 0 .08em;
  -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.lede { font-size: clamp(17px, 2vw, 19px); color: var(--ink-muted); max-width: 36em; margin-bottom: 32px; }

/* Sign-up form */
.signup { background: var(--card); border-radius: var(--radius-card); padding: 20px; box-shadow: var(--shadow); max-width: 560px; }
@media (min-width: 640px) { .signup { padding: 24px; } }
.field-label { display: block; font-weight: 700; margin-bottom: 10px; }
.signup-row { display: flex; flex-direction: column; gap: 10px; }
@media (min-width: 520px) { .signup-row { flex-direction: row; } }
.signup input[type="email"] {
  flex: 1; min-width: 0; min-height: 52px; padding: 0 16px; font: inherit; color: var(--ink);
  background: var(--card); border: 1.5px solid var(--outline); border-radius: var(--radius-btn);
}
.signup input[type="email"]:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--container); }
.signup input[aria-invalid="true"] { border-color: var(--error); }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 0 22px;
  font: inherit; font-weight: 700; color: var(--on-primary); background: var(--primary); border: 0;
  border-radius: var(--radius-btn); cursor: pointer; text-decoration: none; white-space: nowrap; }
.btn:hover { filter: brightness(1.06); }
.btn:focus-visible { outline: 3px solid var(--marker); outline-offset: 2px; }
.btn[disabled] { opacity: .6; cursor: progress; }

.langs { border: 0; padding: 0; margin: 18px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.langs legend { padding: 0; margin-bottom: 10px; font-size: 15px; font-weight: 600; }
.chip { position: relative; }
.chip input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.chip span { display: inline-flex; align-items: center; min-height: 40px; padding: 0 14px; font-size: 15px;
  font-weight: 600; background: var(--raised); color: var(--ink); border: 1.5px solid transparent;
  border-radius: var(--radius-chip); user-select: none; }
.chip input:checked + span { background: var(--container); color: var(--on-container); border-color: var(--primary); }
.chip input:checked + span::before { content: "✓"; margin-right: 6px; }
.chip input:focus-visible + span { outline: 3px solid var(--primary); outline-offset: 2px; }

.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.form-note { font-size: 14px; color: var(--ink-muted); margin-top: 16px; }
.form-status { font-size: 15px; font-weight: 600; margin-top: 8px; min-height: 1.6em; }
.form-status.ok { color: var(--on-container); background: var(--container); padding: 10px 14px; border-radius: var(--radius-chip); }
.form-status.err { color: var(--error); }

/* Phone mock-up */
.hero-art { display: flex; justify-content: center; }
.phone { width: min(320px, 100%); aspect-ratio: 9 / 18.5; padding: 10px; border-radius: 44px;
  background: #1D1C19; box-shadow: 0 30px 60px rgba(29, 28, 25, .18); }
.phone-screen { position: relative; height: 100%; border-radius: 34px; overflow: hidden; background: #FAFAFA; }
.source-app { padding: 22px 20px; color: #333; }
.src-bar { height: 26px; border-radius: 8px; background: #ECECEC; margin-bottom: 20px; }
.src-text { font-size: 15px; line-height: 1.55; margin-bottom: 14px; }
.src-sel { background: rgba(66, 133, 244, .28); }
.src-line { height: 10px; border-radius: 5px; background: #E6E6E6; margin-bottom: 10px; }
.w90 { width: 90%; } .w80 { width: 80%; } .w70 { width: 70%; }
.sheet { position: absolute; left: 0; right: 0; bottom: 0; padding: 10px 16px 18px; background: var(--ground);
  border-radius: var(--radius-sheet) var(--radius-sheet) 0 0; box-shadow: 0 -10px 30px rgba(0, 0, 0, .12); color: var(--ink); }
.sheet-handle { width: 36px; height: 4px; border-radius: 2px; background: var(--border); margin: 0 auto 10px; }
.sheet-hint { font-size: 12px; color: var(--ink-muted); margin-bottom: 8px; }
.tokens { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 12px; }
.tokens span { font-size: 13px; padding: 4px 8px; border-radius: 8px; background: var(--card); border: 1px solid var(--divider); }
.tokens .on { background: var(--marker); border-color: var(--marker); font-weight: 700; }
.mini-card { background: var(--card); border-radius: 16px; padding: 12px 14px; margin-bottom: 12px; }
.mini-head { display: flex; align-items: center; gap: 8px; margin-bottom: 2px; }
.mini-head strong { font-size: 20px; letter-spacing: -0.01em; }
.tag { font-size: 11px; font-weight: 600; color: var(--ink-muted); background: var(--raised); padding: 2px 8px; border-radius: 999px; }
.mini-meaning { font-size: 14px; margin-bottom: 6px; }
.mini-note { font-size: 12px; color: var(--ink-muted); line-height: 1.45; }
.ai { font-size: 10px; font-weight: 700; color: var(--on-warning); background: var(--warning); padding: 1px 6px; border-radius: 6px; margin-right: 4px; }
.sheet-btn { text-align: center; font-weight: 700; font-size: 15px; padding: 12px; border-radius: 14px;
  background: var(--primary); color: var(--on-primary); }

/* Sections */
.section { padding: 72px 0; }
@media (min-width: 900px) { .section { padding: 96px 0; } }
.section.alt { background: var(--raised); }
.section-lede { font-size: 18px; color: var(--ink-muted); margin: -16px 0 28px; }
.section-foot { margin-top: 24px; font-size: 15px; }

.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; }
@media (min-width: 800px) { .steps { grid-template-columns: repeat(3, 1fr); gap: 20px; } }
.step { background: var(--card); border-radius: var(--radius-card); padding: 24px; box-shadow: var(--shadow); }
.step-num { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 50%;
  background: var(--container); color: var(--on-container); font-weight: 800; margin-bottom: 14px; }
.step p, .feature p { color: var(--ink-muted); }

.features { display: grid; gap: 16px; }
@media (min-width: 640px) { .features { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .features { grid-template-columns: repeat(3, 1fr); gap: 20px; } }
.feature { background: var(--card); border-radius: var(--radius-card); padding: 24px; }

.lang-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.lang { display: flex; flex-direction: column; gap: 4px; background: var(--card); border-radius: var(--radius-card);
  padding: 20px; box-shadow: var(--shadow); }
.lang-word { font-size: 26px; font-weight: 700; margin-bottom: 6px; }
.lang .muted { font-size: 14px; line-height: 1.45; }
.beta { font-size: 12px; font-weight: 600; color: var(--ink-muted); background: var(--raised); padding: 2px 8px;
  border-radius: 999px; vertical-align: 2px; margin-left: 4px; }

details { background: var(--card); border-radius: var(--radius-card); padding: 0 20px; margin-bottom: 12px; }
summary { cursor: pointer; font-weight: 700; padding: 18px 28px 18px 0; list-style: none; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 0; top: 50%; transform: translateY(-50%);
  font-size: 22px; font-weight: 500; color: var(--ink-muted); }
details[open] summary::after { content: "–"; }
details p { color: var(--ink-muted); padding-bottom: 18px; }

.cta h2 { margin-bottom: 20px; }

/* Footer */
.foot { border-top: 1px solid var(--divider); padding: 28px 0 40px; font-size: 15px; color: var(--ink-muted); }
.foot-inner { display: flex; gap: 20px; flex-wrap: wrap; justify-content: space-between; }

/* Privacy page */
.doc { padding: 40px 0 80px; }
.doc h1 { font-size: clamp(32px, 5vw, 44px); margin-bottom: 8px; }
.doc h2 { font-size: 22px; margin: 36px 0 10px; }
.doc p, .doc li { color: var(--ink-muted); }
.doc p + p { margin-top: 12px; }
.doc ul { padding-left: 22px; }
.doc strong { color: var(--ink); }