/* Layout: sky-toned page, sticky header, one featured product panel (Sunlit Cassette) in a fixed "VFD night" look, then quieter product cards, company, contact. */
:root {
  --bg: #f3f6fa;
  --surface: #ffffff;
  --ink: #0f1d31;
  --muted: #56667c;
  --line: #d9e2ec;
  --tangerine: #e8701a;
  --tangerine-soft: #fde8d6;
  --cirrus: #2d6bc9;
  --sky-glow: #dbe9fb;

  /* Featured panel: fixed dark in both themes */
  --deck: #12151b;
  --deck-2: #1b2029;
  --deck-ink: #ece7de;
  --deck-muted: #a39d93;
  --deck-line: #2c323d;
  --wood: #c99a62;

  --font-display: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --font-body: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  --step--1: 0.8125rem;
  --step-0: 1rem;
  --step-1: 1.125rem;
  --step-2: 1.5rem;
  --step-3: clamp(1.75rem, 1.3rem + 1.8vw, 2.5rem);
  --step-4: clamp(2rem, 1.3rem + 3vw, 3.4rem);

  --wrap: 72rem;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a1220;
    --surface: #111c2d;
    --ink: #e6edf6;
    --muted: #97a6ba;
    --line: #223149;
    --tangerine: #ff9447;
    --tangerine-soft: #3a2513;
    --cirrus: #86b4ff;
    --sky-glow: #15233a;
    --deck: #0d1015;
    --deck-2: #161a22;
    --deck-line: #262c37;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0a1220;
  --surface: #111c2d;
  --ink: #e6edf6;
  --muted: #97a6ba;
  --line: #223149;
  --tangerine: #ff9447;
  --tangerine-soft: #3a2513;
  --cirrus: #86b4ff;
  --sky-glow: #15233a;
  --deck: #0d1015;
  --deck-2: #161a22;
  --deck-line: #262c37;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.85;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--cirrus); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--tangerine); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.35; text-wrap: balance; margin: 0; letter-spacing: 0.01em; }
p { margin: 0; }

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--tangerine);
  font-weight: 500;
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; z-index: 100; background: var(--surface); padding: 8px 12px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand-logo { width: 40px; height: 40px; flex: none; border-radius: 50%; }
.brand-name { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; letter-spacing: 0.04em; line-height: 1.2; }
.brand-name small { display: block; font-family: var(--font-body); font-weight: 400; font-size: 0.68rem; color: var(--muted); letter-spacing: 0.12em; }
.site-nav { display: flex; gap: clamp(12px, 3vw, 32px); }
.site-nav a { color: var(--ink); text-decoration: none; font-size: 0.9rem; font-weight: 500; }
.site-nav a:hover { color: var(--tangerine); }
.site-nav { align-items: center; }
.site-nav .lang-switch { padding: 3px 10px; border: 1px solid var(--line); border-radius: 999px; font-size: 0.78rem; font-weight: 600; white-space: nowrap; }
@media (max-width: 520px) {
  .brand-name small { display: none; }
  .site-nav a { font-size: 0.82rem; }
}
@media (max-width: 440px) {
  .brand-name { display: none; }
  .site-nav { gap: 10px; }
  .site-nav a { font-size: 0.78rem; white-space: nowrap; }
  .site-nav .lang-switch { padding: 3px 8px; font-size: 0.74rem; }
}

/* ---------- Buttons ---------- */
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn-play {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 10px 20px 10px 16px;
  border-radius: 12px;
  background: var(--ink); color: var(--bg);
  text-decoration: none; line-height: 1.2;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn-play:hover { transform: translateY(-1px); box-shadow: 0 6px 18px color-mix(in srgb, var(--ink) 25%, transparent); }
.btn-play svg { width: 22px; height: 22px; flex: none; }
.btn-play span { display: flex; flex-direction: column; font-size: 0.68rem; letter-spacing: 0.06em; opacity: .85; }
.btn-play b { font-size: 1.02rem; letter-spacing: 0.02em; opacity: 1; font-weight: 700; }
.btn-ghost {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 12px 18px; border-radius: 12px;
  color: var(--ink); text-decoration: none; font-weight: 500; font-size: 0.95rem;
  border: 1px solid var(--line);
}
.btn-ghost:hover { border-color: var(--tangerine); color: var(--tangerine); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(60rem 26rem at 85% 10%, color-mix(in srgb, var(--tangerine) 22%, transparent), transparent 60%),
    radial-gradient(50rem 30rem at 10% 0%, var(--sky-glow), transparent 70%),
    var(--bg);
}
.hero::before {
  /* cirrus streaks */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(172deg, transparent 38%, color-mix(in srgb, var(--surface) 55%, transparent) 40%, transparent 44%),
    linear-gradient(168deg, transparent 52%, color-mix(in srgb, var(--surface) 40%, transparent) 53.5%, transparent 57%);
  opacity: .8;
}
.hero .wrap {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
  padding-block: clamp(48px, 8vw, 104px) clamp(40px, 6vw, 80px);
}
.hero-copy { display: grid; gap: 22px; min-width: 0; }
.hero h1 { font-size: var(--step-4); font-weight: 900; line-height: 1.22; letter-spacing: 0.02em; }
.hero h1 .nw { display: inline-block; }
.hero h1 em { font-style: normal; color: var(--tangerine); }
.hero .lead { font-size: var(--step-1); color: var(--muted); max-width: 34em; }
.app-id { display: flex; align-items: center; gap: 14px; }
.app-id img { width: 56px; height: 56px; border-radius: 14px; box-shadow: 0 4px 14px color-mix(in srgb, var(--ink) 18%, transparent); }
.app-id b { display: block; font-family: var(--font-display); font-size: 1.05rem; }
.app-id span { font-size: var(--step--1); color: var(--muted); }

.hero-visual { position: relative; display: grid; place-items: center; min-width: 0; }
.phone {
  position: relative;
  width: min(300px, 78vw);
  transform: rotate(-3deg);
  filter: drop-shadow(0 30px 40px color-mix(in srgb, var(--ink) 35%, transparent));
}
.phone img { width: 100%; height: auto; }
.sun-disc {
  position: absolute; width: 70%; aspect-ratio: 1; border-radius: 50%;
  right: -6%; top: 6%;
  background: radial-gradient(circle at 40% 40%, color-mix(in srgb, var(--tangerine) 70%, #ffd8a8), color-mix(in srgb, var(--tangerine) 10%, transparent) 70%);
  filter: blur(4px); opacity: .55;
}
.hero-icon {
  position: absolute; left: 2%; bottom: 8%;
  width: 104px; border-radius: 24px;
  box-shadow: 0 18px 40px -12px color-mix(in srgb, var(--ink) 50%, transparent);
  transform: rotate(5deg);
}
@media (max-width: 820px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .phone { width: min(230px, 60vw); }
  .hero-icon { width: 76px; left: 8%; }
}

/* ---------- Company strip ---------- */
.intro { border-block: 1px solid var(--line); background: var(--surface); }
.intro .wrap { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px; align-items: center; padding-block: 28px; }
.intro p { font-size: var(--step-1); max-width: 40em; }
.intro p strong { font-family: var(--font-display); }
.intro .meta { font-family: var(--font-mono); font-size: var(--step--1); color: var(--muted); letter-spacing: 0.08em; white-space: nowrap; }
@media (max-width: 720px) { .intro .wrap { grid-template-columns: 1fr; } .intro .meta { white-space: normal; } }

/* ---------- Sections ---------- */
.section { padding-block: clamp(64px, 9vw, 120px); }
.section-head { display: grid; gap: 10px; margin-bottom: clamp(32px, 5vw, 56px); max-width: 40rem; }
.section-head h2 { font-size: var(--step-3); font-weight: 700; }
.section-head p { color: var(--muted); }

/* ---------- Featured: Sunlit Cassette ---------- */
.deck {
  background:
    radial-gradient(40rem 20rem at 100% 0%, color-mix(in srgb, var(--wood) 18%, transparent), transparent 70%),
    var(--deck);
  color: var(--deck-ink);
  border-radius: calc(var(--radius) * 2);
  padding: clamp(24px, 5vw, 56px);
  display: grid;
  gap: clamp(32px, 5vw, 48px);
  overflow: hidden;
}
.deck a { color: var(--wood); }
.deck-top { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr); gap: clamp(28px, 5vw, 56px); align-items: center; }
.deck-title { display: grid; gap: 18px; min-width: 0; }
.deck-title .badge {
  justify-self: start;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--deck); background: var(--wood); padding: 4px 10px; border-radius: 999px; font-weight: 600;
}
.deck h3 { font-size: var(--step-3); font-weight: 700; color: var(--deck-ink); }
.deck h3 small { display: block; font-size: 0.5em; font-weight: 500; color: var(--deck-muted); letter-spacing: 0.08em; margin-top: 6px; }
.deck .desc { color: color-mix(in srgb, var(--deck-ink) 85%, var(--deck)); max-width: 34em; }
.deck .btn-play { background: var(--deck-ink); color: var(--deck); }

/* Demo video in a phone frame */
.demo { margin: 0; display: grid; justify-items: center; gap: 14px; min-width: 0; }
.demo-phone {
  position: relative;
  width: min(260px, 68vw);
  aspect-ratio: 540 / 1200;
  max-width: 100%;
  border: 10px solid #0b0c0f;
  border-radius: 38px;
  overflow: hidden;
  background: #0b0c0f;
  box-shadow: 0 0 0 2px #3a3d44, 0 30px 60px -20px rgba(0,0,0,.7), 0 0 80px -10px color-mix(in srgb, var(--wood) 35%, transparent);
}
.demo-phone::before {
  content: ""; position: absolute; z-index: 1; top: 8px; left: 50%; width: 10px; height: 10px;
  margin-left: -5px; border-radius: 50%; background: #050506;
}
.demo-phone video { width: 100%; height: 100%; object-fit: cover; display: block; border-radius: 28px; }
.demo figcaption { display: grid; justify-items: center; gap: 8px; text-align: center; }
.sound-btn {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  font: inherit; font-size: 0.9rem; font-weight: 500;
  padding: 9px 16px; border-radius: 999px;
  color: var(--deck-ink); background: var(--deck-2); border: 1px solid var(--deck-line);
}
.sound-btn:hover { border-color: var(--wood); }
.sound-btn svg { width: 20px; height: 20px; }
.sound-btn .wave { display: none; }
.sound-btn[aria-pressed="true"] { background: var(--wood); color: var(--deck); border-color: var(--wood); }
.sound-btn[aria-pressed="true"] .wave { display: inline; }
.sound-btn[aria-pressed="true"] .mute { display: none; }
.demo-note { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--deck-muted); }

.specs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; background: var(--deck-line); border: 1px solid var(--deck-line); border-radius: 12px; overflow: hidden; }
.spec { background: var(--deck-2); padding: 16px 18px; display: grid; gap: 2px; align-content: start; }
.spec b { font-family: var(--font-display); font-size: 1.05rem; font-weight: 700; color: var(--deck-ink); line-height: 1.5; }
.spec span { font-size: var(--step--1); color: var(--deck-muted); line-height: 1.6; }

.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px 32px; }
.feature { display: grid; gap: 6px; align-content: start; padding-top: 14px; border-top: 1px solid var(--deck-line); min-width: 0; }
.feature h4 { margin: 0; font-family: var(--font-display); font-size: var(--step-1); color: var(--deck-ink); }
.feature p { font-size: 0.92rem; color: var(--deck-muted); line-height: 1.8; }

.banners { display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; }
.banners img { border-radius: 12px; aspect-ratio: 16 / 9; object-fit: cover; width: 100%; border: 1px solid var(--deck-line); }

.shots {
  display: flex; gap: 14px;
  overflow-x: auto; scroll-snap-type: x mandatory;
  padding-bottom: 8px;
  scrollbar-width: thin;
}
.shots img {
  flex: none; height: 380px; width: auto; aspect-ratio: var(--ar, 540 / 1200);
  border-radius: 14px; scroll-snap-align: start; object-fit: cover;
  border: 1px solid var(--line);
  background: var(--surface);
}
.deck .shots img { border-color: var(--deck-line); background: var(--deck-2); }
.shots-note { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em; color: var(--muted); }
.deck .shots-note { color: var(--deck-muted); }

@media (max-width: 900px) {
  .deck-top { grid-template-columns: 1fr; }
  .specs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .features { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .features { grid-template-columns: 1fr; }
  .banners { grid-template-columns: 1fr; }
  .shots img { height: 300px; }
}

/* ---------- Other apps ---------- */
.apps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin-top: 24px; }
.app {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) * 1.5);
  padding: clamp(22px, 3.5vw, 36px);
  display: grid; gap: 20px; align-content: start;
  min-width: 0;
}
.app-head { display: flex; gap: 16px; align-items: center; }
.app-head img { width: 64px; height: 64px; border-radius: 16px; flex: none; border: 1px solid var(--line); }
.app-head h3 { font-size: var(--step-2); }
.app-head p { font-size: var(--step--1); color: var(--muted); line-height: 1.6; }
.app .desc { color: var(--muted); }
.points { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.points li { display: grid; grid-template-columns: 18px minmax(0, 1fr); gap: 10px; font-size: 0.95rem; line-height: 1.7; }
.points li::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--tangerine); margin-top: 0.6em; justify-self: center; }
.points b { font-weight: 700; }
.app .shots img { height: 300px; }
.app .btn-row { margin-top: 4px; }
.sub-link { font-size: var(--step--1); }
@media (max-width: 860px) { .apps { grid-template-columns: 1fr; } }

/* ---------- Company ---------- */
.company { background: var(--surface); border-block: 1px solid var(--line); }
.company-grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(32px, 6vw, 80px); align-items: start; }
.motto { display: grid; gap: 18px; }
.motto blockquote {
  margin: 0;
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(1.4rem, 1.05rem + 1.4vw, 2rem); line-height: 1.6;
  text-wrap: balance;
}
.motto blockquote span { background: linear-gradient(transparent 62%, var(--tangerine-soft) 62%); }
.motto p { color: var(--muted); }
.facts { margin: 0; display: grid; border-top: 1px solid var(--line); }
.facts > div { display: grid; grid-template-columns: 8.5rem minmax(0, 1fr); gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.facts dt { color: var(--muted); font-size: 0.9rem; }
.facts dd { margin: 0; min-width: 0; overflow-wrap: anywhere; }
.facts dd small { display: block; color: var(--muted); font-size: var(--step--1); }
@media (max-width: 760px) {
  .company-grid { grid-template-columns: 1fr; }
  .facts > div { grid-template-columns: 1fr; gap: 2px; }
}

/* ---------- Contact ---------- */
.contact-card {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px; align-items: center;
  padding: clamp(24px, 4vw, 40px);
  border-radius: calc(var(--radius) * 1.5);
  background:
    radial-gradient(30rem 14rem at 100% 0%, color-mix(in srgb, var(--tangerine) 18%, transparent), transparent 70%),
    var(--surface);
  border: 1px solid var(--line);
}
.contact-card h2 { font-size: var(--step-3); }
.contact-card p { color: var(--muted); margin-top: 8px; }
.mail { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.mail a { font-family: var(--font-mono); font-size: clamp(1rem, 0.9rem + 0.5vw, 1.2rem); color: var(--ink); font-weight: 500; overflow-wrap: anywhere; }
.copy-btn {
  font: inherit; font-size: var(--step--1); cursor: pointer;
  padding: 8px 14px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink);
}
.copy-btn:hover { border-color: var(--tangerine); }
@media (max-width: 760px) { .contact-card { grid-template-columns: 1fr; } }

/* ---------- Footer ---------- */
.site-footer { padding-block: 40px 56px; color: var(--muted); font-size: 0.88rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 20px; align-items: center; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--tangerine); }

/* ---------- Policy pages ---------- */
.doc { padding-block: clamp(40px, 7vw, 88px); }
.doc .wrap { max-width: 46rem; }
.doc header { display: grid; gap: 10px; margin-bottom: 40px; padding-bottom: 28px; border-bottom: 1px solid var(--line); }
.doc h1 { font-size: var(--step-3); font-weight: 700; }
.doc .updated { font-family: var(--font-mono); font-size: var(--step--1); color: var(--muted); }
.doc h2 { font-size: var(--step-1); font-weight: 700; margin-top: 36px; margin-bottom: 10px; }
.doc p, .doc li { color: color-mix(in srgb, var(--ink) 88%, var(--bg)); }
.doc ul { padding-left: 1.3em; margin: 8px 0; }
.doc .lang { margin-top: 64px; padding-top: 40px; border-top: 1px solid var(--line); }
.doc .contact-box { margin-top: 36px; padding: 20px 24px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line); }
.back { display: inline-flex; gap: 6px; font-size: 0.9rem; margin-bottom: 24px; text-decoration: none; }