/* OtoMotion LP。アプリと同じ紺×オレンジ（音に反応する演出・帯域の話だけ紫）。見出しは Noto Sans JP 900、英字ラベルと数字は Montserrat */
:root {
  --side: #0e1220; --page: #1a1f2e; --card: #252b3c; --line: #343b50;
  --ink: #e8ebf2; --muted: #9aa3b8; --orange: #F24028; --orange2: #ff6a4d; --violet: #b04dff;
  --disp: "Noto Sans JP", "Yu Gothic UI", "Meiryo", sans-serif; --num: "Montserrat", "Noto Sans JP", sans-serif;
  --body: "Noto Sans JP", "Yu Gothic UI", "Meiryo", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--page); color: var(--ink); font-family: var(--body); line-height: 1.8; font-size: 16px; -webkit-font-smoothing: antialiased; overflow-wrap: anywhere; }
a { color: inherit; }
img, video { max-width: 100%; height: auto; display: block; }
code { font-family: Consolas, "SFMono-Regular", Menlo, monospace; font-size: .92em; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.disp { word-break: auto-phrase; font-family: var(--disp); font-weight: 900; letter-spacing: .01em; line-height: 1.2; }
h2.disp { font-size: clamp(26px, 3.8vw, 42px); margin: 0 0 8px; }
h2.disp .y { color: var(--orange); }
h2.disp .v { color: var(--violet); }
.label { display: block; font-family: var(--num); font-weight: 700; font-size: 12px; letter-spacing: .24em; color: var(--orange2); margin-bottom: 8px; text-transform: uppercase; }
.sub { color: var(--muted); margin: 0 0 32px; font-size: 15px; }
section { padding: 72px 0; }
section + section { border-top: 1px solid var(--line); }

/* ヘッダー */
header { position: sticky; top: 0; z-index: 10; background: rgba(14, 18, 32, .92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; gap: 18px; height: 60px; max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.logo { display: flex; align-items: center; text-decoration: none; flex-shrink: 0; }
.logo img { height: 30px; width: auto; display: block; }
.bar nav { display: flex; gap: 18px; margin-left: 12px; font-size: 14px; color: var(--muted); }
.bar nav a { text-decoration: none; white-space: nowrap; }
.bar nav a:hover { color: #fff; }
.bar .right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.lang { text-decoration: none; font-size: 13px; padding: 5px 10px; border: 1px solid var(--line); border-radius: 6px; color: var(--muted); white-space: nowrap; }
.cta { display: inline-block; background: var(--orange); color: #fff; text-decoration: none; font-weight: 700; padding: 12px 22px; border-radius: 8px; }
.cta.small { padding: 8px 14px; font-size: 14px; white-space: nowrap; }
.cta:hover { background: var(--orange2); }
.cta.ghost { background: transparent; border: 1px solid var(--line); color: var(--ink); }
.cta.ghost:hover { border-color: var(--orange2); color: #fff; background: transparent; }
@media (max-width: 900px) { .bar nav { display: none; } }

/* ヒーロー（アプリの TOP 画面の雰囲気：暗い紺に、左オレンジ・右紫の粒子の波） */
#top { position: relative; overflow: hidden; padding: 72px 0 72px; border-top: 0;
  background:
    radial-gradient(ellipse 60% 70% at 8% 25%, rgba(242, 64, 40, .22), transparent 70%),
    radial-gradient(ellipse 60% 70% at 95% 30%, rgba(176, 77, 255, .22), transparent 70%),
    var(--side); }
#top::before { content: ""; position: absolute; inset: 0; background: url("img/hero-waves.svg") center / cover no-repeat; opacity: 1; pointer-events: none; }
#top .wrap { position: relative; display: grid; grid-template-columns: 1fr 1.1fr; gap: 40px; align-items: center; }
.kicker { display: inline-block; color: var(--orange2); font-weight: 700; font-size: 14px; letter-spacing: .12em; margin-bottom: 14px; }
h1.disp { word-break: keep-all; overflow-wrap: normal; font-size: clamp(40px, 5.6vw, 72px); margin: 0 0 18px; color: #fff; text-shadow: 0 6px 30px rgba(0,0,0,.55); }
h1.disp span { color: var(--orange); }
.lead { font-size: 17px; color: #cfd5e3; margin: 0 0 26px; max-width: 30em; }
.cta-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.screen { position: relative; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: #000; box-shadow: 0 20px 60px rgba(0,0,0,.55); }
.screen video { width: 100%; aspect-ratio: 16 / 9; }
.screen .fallback { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: -1; }
.screen .cap { position: absolute; left: 12px; bottom: 10px; font-size: 12px; color: var(--muted); background: rgba(14,18,32,.75); padding: 3px 8px; border-radius: 4px; }
@media (max-width: 900px) { #top .wrap { grid-template-columns: 1fr; } }
@media (max-width: 600px) { .screen .cap { position: static; display: block; margin: 0; border-radius: 0; padding: 6px 10px; } }

/* 数字 */
.facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; max-width: 1120px; margin: -28px auto 0; padding: 0 20px; position: relative; list-style: none; }
.facts li { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 18px 20px; }
.facts .v { display: block; font-family: var(--num); font-weight: 800; font-size: 44px; color: var(--orange); line-height: 1; }
.facts .v small { font-family: var(--body); font-weight: 700; font-size: 17px; color: var(--ink); margin-left: 6px; }
.facts .k { display: block; color: var(--muted); font-size: 13px; margin-top: 8px; }
@media (max-width: 640px) { .facts { grid-template-columns: 1fr; } }

/* カード群 */
.grid { display: grid; gap: 16px; }
.grid.c2 { grid-template-columns: 1fr 1fr; }
.grid.c3 { grid-template-columns: repeat(3, 1fr); }
.grid.c4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid.c3, .grid.c4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .grid.c2, .grid.c3, .grid.c4 { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 22px; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: #cfd5e3; font-size: 15px; }
.card .n { font-family: var(--num); font-weight: 800; font-size: 32px; color: var(--orange); line-height: 1.1; margin-bottom: 10px; }
.card img { border-radius: 8px; border: 1px solid var(--line); margin-bottom: 14px; }

/* できること（アプリの TOP のカードと同じ「01 —— LOUDNESS」の頭） */
.feat .head { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; font-family: var(--num); }
.feat .head b { font-weight: 800; font-size: 26px; color: var(--orange); line-height: 1; }
.feat .head i { flex: 0 0 26px; height: 2px; background: currentColor; color: var(--orange); }
.feat .head span { margin-left: auto; font-weight: 700; font-size: 11px; letter-spacing: .22em; color: var(--orange2); text-transform: uppercase; }
.feat .card { border-top: 2px solid var(--orange); }
.feat .card.reactive { border-top-color: var(--violet); }
.feat .reactive .head b, .feat .reactive .head span, .feat .reactive .head i { color: var(--violet); }
.feat .reactive .head i { background: var(--violet); }

/* 並べた画像・サンプル */
.shot { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--side); }
.shot img { width: 100%; }
.shot + .note, .caption { margin-top: 12px; }
/* アプリと XPression の並び: PC は横 1 枚、スマホは縦 2 段 */
.shot-stack { display: none; }
.stack-arrow { text-align: center; color: var(--orange2); font-weight: 700; letter-spacing: .08em; margin: 10px 0; font-size: 14px; }
@media (max-width: 700px) { .shot-wide { display: none; } .shot-stack { display: block; } }

.split { display: grid; grid-template-columns: 1.35fr 1fr; gap: 32px; align-items: center; }
.split p { color: #cfd5e3; margin: 0 0 14px; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } }

/* しくみ（4 ステップ） */
.steps { counter-reset: s; }
.steps .card { position: relative; padding-top: 28px; }
.steps .card::before { counter-increment: s; content: counter(s); position: absolute; top: -14px; left: 18px; width: 30px; height: 30px; border-radius: 50%; background: var(--orange); color: #fff; font-family: var(--num); font-weight: 800; font-size: 15px; display: grid; place-items: center; }
.steps .card small { display: block; color: var(--muted); font-size: 13px; margin-bottom: 6px; }
.codebox { margin-top: 20px; background: var(--side); border: 1px solid var(--line); border-radius: 10px; padding: 14px 18px; display: flex; flex-wrap: wrap; gap: 6px 24px; align-items: baseline; }
.codebox code { color: var(--orange2); font-size: 15px; }
.codebox span { color: var(--muted); font-size: 13px; }

/* 仕様表 */
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 12px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 500; font-size: 13px; }
td.k { color: var(--orange2); font-weight: 700; white-space: nowrap; }
@media (max-width: 600px) { td.k { white-space: normal; width: 34%; } }

/* FAQ */
details { border-bottom: 1px solid var(--line); padding: 12px 0; }
summary { cursor: pointer; font-weight: 700; }
details p { color: #cfd5e3; margin: 8px 0 0; font-size: 15px; }

/* 問い合わせ */
#contact { background: linear-gradient(180deg, var(--page), var(--side)); text-align: center; }
#contact p { color: #cfd5e3; }
footer { padding: 26px 0; color: var(--muted); font-size: 13px; text-align: center; border-top: 1px solid var(--line); background: var(--side); }
footer a { color: var(--muted); }
footer .tm { font-size: 11px; margin: 8px 0 0; opacity: .85; }
.note { color: var(--muted); font-size: 13px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
/* controls を付けた動画：ループ再生のまま止められる（WCAG 2.2.2） */
.screen video::-webkit-media-controls-panel { background: linear-gradient(transparent, rgba(0,0,0,.6)); }
/* 360 幅：ヘッダーの CTA が折れないように詰める */
@media (max-width: 480px) { .bar { gap: 8px; padding: 0 14px; } .logo img { height: 22px; } .lang { padding: 4px 8px; } .cta.small { padding: 6px 10px; font-size: 13px; } }