/* ============ tokens ============ */
:root {
  --bg-top: #eef6ff;
  --bg-bottom: #f8fbff;
  --ink: #28394a;
  --ink-strong: #1d2c3a;
  --muted: #6a7d90;
  --accent: #3b6fb0;
  --accent-2: #6aa0dc;
  --accent-soft: #e8f1fb;
  --card: #ffffff;
  --line: #e2edf8;
  --shadow: 0 18px 50px -22px rgba(54, 99, 158, 0.42);
  --shadow-sm: 0 10px 30px -16px rgba(54, 99, 158, 0.4);
  --radius: 18px;
  --maxw: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP",
    "Segoe UI", Meiryo, system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: linear-gradient(170deg, var(--bg-top) 0%, var(--bg-bottom) 60%, #ffffff 100%);
  background-attachment: fixed;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.01em;
}

h1, h2, h3 { color: var(--ink-strong); line-height: 1.32; letter-spacing: 0.02em; }
h1 { font-size: clamp(2rem, 4.6vw, 3.4rem); font-weight: 700; margin: 0 0 0.6em; }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.3rem); font-weight: 700; margin: 0 0 0.5em; }
h3 { font-size: 1.12rem; font-weight: 700; margin: 0 0 0.4em; }
p { margin: 0 0 1em; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ============ nav ============ */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 24px;
  padding: 14px clamp(18px, 4vw, 40px);
  background: rgba(247, 251, 255, 0.72);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s ease, background 0.4s ease;
}
.nav.is-scrolled { border-bottom-color: var(--line); background: rgba(247, 251, 255, 0.86); }
.nav__brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink-strong); }
.nav__brand img { border-radius: 7px; }
.nav__links { display: flex; gap: 22px; margin-left: auto; font-size: 0.92rem; color: var(--muted); }
.nav__links a { position: relative; padding: 4px 0; transition: color 0.25s ease; }
.nav__links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 2px;
  background: var(--accent); border-radius: 2px; transition: right 0.3s ease;
}
.nav__links a:hover { color: var(--accent); }
.nav__links a:hover::after { right: 0; }
.nav__lang {
  display: inline-flex; align-items: center; gap: 2px; padding: 3px;
  border: 1px solid var(--line); border-radius: 999px;
  background: rgba(255, 255, 255, 0.66); box-shadow: var(--shadow-sm);
}
.nav__lang button {
  display: inline-grid; place-items: center; min-width: 34px; height: 28px;
  border: 0; border-radius: 999px; background: transparent; color: var(--muted);
  font: inherit; font-size: 0.76rem; font-weight: 800; cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}
.nav__lang button.is-active {
  background: #fff; color: var(--accent); box-shadow: inset 0 0 0 1px rgba(59, 111, 176, 0.12);
}
.nav__lang button:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; }
.nav__cta {
  padding: 8px 18px; border-radius: 999px; font-size: 0.9rem; font-weight: 600;
  color: #fff; background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: var(--shadow-sm); transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.nav__cta:hover { transform: translateY(-1px); box-shadow: 0 14px 30px -14px rgba(54, 99, 158, 0.55); }

/* ============ buttons ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 26px; border-radius: 999px; font-weight: 600; font-size: 0.98rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}
.btn--primary { color: #fff; background: linear-gradient(135deg, var(--accent), var(--accent-2)); box-shadow: var(--shadow-sm); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 18px 36px -16px rgba(54, 99, 158, 0.6); }
.btn--ghost { color: var(--accent); background: #fff; border: 1px solid var(--line); }
.btn--ghost:hover { transform: translateY(-2px); border-color: var(--accent-2); }
.btn--lg { padding: 16px 38px; font-size: 1.05rem; }

/* ============ shared layout ============ */
section { padding: clamp(64px, 9vw, 120px) clamp(18px, 4vw, 40px); scroll-margin-top: 68px; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 0.86rem; letter-spacing: 0.14em; text-transform: uppercase; margin: 0 0 0.8em; }
.tag {
  display: inline-block; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em;
  color: var(--accent); background: var(--accent-soft); padding: 5px 14px; border-radius: 999px; margin-bottom: 16px;
}
.tag--light { color: var(--accent); background: rgba(255, 255, 255, 0.75); }

.ticks { list-style: none; padding: 0; margin: 18px 0 0; }
.ticks li { position: relative; padding-left: 30px; margin-bottom: 12px; color: var(--ink); }
.ticks li::before {
  content: ""; position: absolute; left: 0; top: 0.55em;
  width: 16px; height: 9px; border-left: 2.4px solid var(--accent); border-bottom: 2.4px solid var(--accent);
  transform: rotate(-45deg); transform-origin: left center;
}

/* ============ frame (screenshot) ============ */
.frame {
  border-radius: var(--radius); overflow: hidden;
  background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow);
  transition: transform 0.5s cubic-bezier(.2,.7,.3,1), box-shadow 0.5s ease;
}
.frame img { width: 100%; }
.frame:hover { transform: translateY(-6px); box-shadow: 0 28px 60px -24px rgba(54, 99, 158, 0.5); }
.frame--float { animation: floaty 7s ease-in-out infinite; }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.frame--wide { max-width: 760px; margin: 0 auto; }

/* ============ hero ============ */
.hero {
  display: grid; grid-template-columns: 1.05fr 1.1fr; gap: clamp(30px, 5vw, 70px);
  align-items: center; max-width: var(--maxw); margin: 0 auto;
  padding-top: clamp(50px, 7vw, 90px);
}
.lede { font-size: 1.18rem; color: var(--ink); max-width: 30em; }
.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; margin: 26px 0 16px; }
.hero__note { font-size: 0.9rem; color: var(--muted); margin: 0; }

/* ============ feature rows ============ */
.feature {
  display: grid; grid-template-columns: 1fr 1.15fr; gap: clamp(34px, 6vw, 84px);
  align-items: center; max-width: var(--maxw); margin: 0 auto;
}
.feature--rev .feature__text { order: 2; }
.feature--rev .feature__media { order: 1; }
.feature__text p { color: var(--muted); font-size: 1.05rem; }
.feature__media--stack { position: relative; padding-bottom: 36px; }
.frame--sm { max-width: 100%; }
.frame--lap {
  position: absolute; right: -6%; bottom: 0; width: 56%;
  border-width: 3px; box-shadow: 0 22px 48px -20px rgba(54, 99, 158, 0.55);
}

/* ============ media band ============ */
.band {
  background: linear-gradient(160deg, #dcebfb, #eef6ff);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.band__head { max-width: 720px; margin: 0 auto; text-align: center; }
.band__head p { color: var(--ink); font-size: 1.08rem; }
.band__shot { margin: 40px auto 8px; }
.band__grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px;
  max-width: 920px; margin: 44px auto 0;
}
.mini {
  background: rgba(255, 255, 255, 0.7); border: 1px solid var(--line);
  border-radius: 14px; padding: 22px 22px; backdrop-filter: blur(6px);
  transition: transform 0.35s ease, background 0.35s ease;
}
.mini:hover { transform: translateY(-4px); background: #fff; }
.mini h3 { color: var(--accent); }
.mini p { margin: 0; color: var(--muted); font-size: 0.96rem; }

/* ============ video section ============ */
.videosec {
  background: linear-gradient(160deg, #dcebfb, #eef6ff);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  text-align: center;
}
.videosec__head { max-width: 700px; margin: 0 auto 38px; }
.tag--play {
  cursor: pointer; display: inline-flex; align-items: center; gap: 8px; user-select: none;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}
.tag--play::before {
  content: ""; border-style: solid; border-width: 4px 0 4px 7px;
  border-color: transparent transparent transparent currentColor;
}
.tag--play:hover, .tag--play:focus-visible {
  background: var(--accent); color: #fff; box-shadow: var(--shadow-sm);
  transform: translateY(-1px); outline: none;
}
.videosec__head p { color: var(--ink); font-size: 1.08rem; }
.videosec__player { max-width: 940px; margin: 0 auto; }
.videosec__player .frame { padding: 0; line-height: 0; }
.videosec__player .frame:hover { transform: none; box-shadow: var(--shadow); }
.videosec__player video,
.videosec__player iframe {
  display: block; width: 100%; border-radius: inherit; background: #0b1622;
}
.videosec__player iframe { aspect-ratio: 16 / 9; height: auto; border: 0; }
.videosec__credit { margin: 14px 0 0; font-size: 0.7rem; color: var(--muted); opacity: 0.62; line-height: 1.5; }

/* ============ cards ============ */
.cards { max-width: var(--maxw); margin: 0 auto; }
.cards__head { text-align: center; max-width: 620px; margin: 0 auto 48px; }
.cards__head p { color: var(--muted); }
.cards__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-sm);
  transition: transform 0.4s cubic-bezier(.2,.7,.3,1), box-shadow 0.4s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.card__shot { aspect-ratio: 16 / 10; overflow: hidden; border-bottom: 1px solid var(--line); background: var(--accent-soft); }
.card__shot img { width: 100%; height: 100%; object-fit: cover; object-position: top center; }
.card h3, .card p { padding: 0 22px; }
.card h3 { margin-top: 20px; }
.card p { margin-bottom: 22px; color: var(--muted); font-size: 0.96rem; }
.cards__more { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 14px 18px; margin-top: 42px; }
.cards__more .pagebtn { margin-top: 0; }

/* ============ subhero (sub pages) ============ */
.subhero { text-align: center; max-width: 720px; margin: 0 auto; padding-top: clamp(40px, 6vw, 80px); }
.subhero h1 { font-size: clamp(1.9rem, 4vw, 2.9rem); margin: 0.4em 0 0.5em; }
.subhero .lede { font-size: 1.15rem; color: var(--muted); }
.backlink { display: inline-flex; align-items: center; gap: 6px; color: var(--accent); font-weight: 600; }
.backlink:hover { text-decoration: underline; }

/* inline link shown inside a feature section */
.feature__link { display: inline-flex; align-items: center; gap: 7px; margin-top: 20px; font-weight: 700; color: var(--accent); }
.feature__link::after { content: "→"; transition: transform 0.2s ease; }
.feature__link:hover::after { transform: translateX(4px); }

/* page button — clearly signposts a detail page */
.pagebtn {
  display: inline-flex; align-items: center; gap: 12px;
  margin-top: 24px; padding: 10px 20px 10px 12px;
  border-radius: 15px; color: var(--accent); background: var(--accent-soft);
  border: 1.5px solid rgba(59, 111, 176, 0.26);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.25s ease, background 0.25s ease,
    color 0.25s ease, border-color 0.25s ease;
}
.pagebtn__ico {
  flex: none; display: grid; place-items: center; width: 36px; height: 36px;
  border-radius: 11px; background: #fff; color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(59, 111, 176, 0.16);
  transition: background 0.25s ease, box-shadow 0.25s ease, color 0.25s ease;
}
.pagebtn__label { display: flex; flex-direction: column; line-height: 1.2; text-align: left; }
.pagebtn__eyebrow { font-size: 0.68rem; font-weight: 800; letter-spacing: 0.14em; opacity: 0.72; }
.pagebtn__main { font-size: 1rem; font-weight: 700; }
.pagebtn__arrow { margin-left: 4px; font-weight: 700; transition: transform 0.2s ease; }
.pagebtn:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; border-color: transparent;
  box-shadow: 0 14px 28px -12px rgba(31, 111, 178, 0.55);
}
.pagebtn:hover .pagebtn__ico {
  background: rgba(255, 255, 255, 0.2); color: #fff;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.4);
}
.pagebtn:hover .pagebtn__arrow { transform: translateX(4px); }
.feature .pagebtn { margin-top: 22px; }
html[data-lang="en"] .nav__links { gap: 18px; font-size: 0.86rem; }
html[data-lang="en"] .pagebtn__main { font-size: 0.96rem; }
html[data-lang="en"] .btn--lg { padding-inline: 30px; }

/* back variant — arrow on the left, returns to the matching feature section */
.pagebtn--back .pagebtn__arrow { margin-left: 0; margin-right: 2px; }
.pagebtn--back:hover .pagebtn__arrow { transform: translateX(-4px); }

/* ============ option chips (settings page) ============ */
.opts { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.opt {
  font-size: 0.84rem; font-weight: 600; color: var(--accent);
  background: var(--accent-soft); border: 1px solid var(--line);
  padding: 5px 12px; border-radius: 999px;
}
.opt--on { background: var(--accent); color: #fff; border-color: var(--accent); }

.settings-overview {
  text-align: center; background: linear-gradient(160deg, #dcebfb, #eef6ff);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.settings-overview__head { max-width: 640px; margin: 0 auto; }
.settings-overview__head p { color: var(--ink); font-size: 1.06rem; }
.settings-overview .frame { max-width: 430px; margin: 36px auto 0; line-height: 0; }

/* ============ sized screenshot frames + captions (menus & windows) ============ */
.frame--menuwide { max-width: 560px; margin-inline: auto; }
.frame--menu { max-width: 330px; margin-inline: auto; }
.frame--snug { max-width: 300px; margin-inline: auto; }
.frame--mini { max-width: 210px; margin-inline: auto; }
.frame--strip { max-width: 760px; margin: 0 auto; }
.shotcap { text-align: center; color: var(--muted); font-size: 0.9rem; margin-top: 12px; }
.section-note { text-align: center; color: var(--muted); font-size: 0.96rem; max-width: 660px; margin: -16px auto 4px; }
.winband { text-align: center; }
.winband .frame--strip { margin-top: 24px; }

/* small inline "trigger" thumbnail shown inside a step's text column */
.trigshot { margin-top: 22px; max-width: 196px; }
.trigshot .shotcap { text-align: left; margin-top: 8px; }
.howto__shot .frame + .shotcap { margin-top: 12px; }
.howto__shot .frame + .frame { margin-top: 18px; }

/* full-width labelled screenshot (desktops gallery) */
.deskhead { text-align: center; max-width: 640px; margin: 0 auto 48px; }
.deskhead p { color: var(--muted); }
.deskshot { max-width: 940px; margin: 0 auto; }
.deskshot + .deskshot { margin-top: clamp(30px, 4.5vw, 52px); }
.deskshot figcaption { text-align: center; margin-top: 14px; color: var(--muted); font-size: 0.98rem; }
.deskshot figcaption strong { display: block; color: var(--ink-strong); font-size: 1.12rem; margin-bottom: 2px; }
.media-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 720px) { .media-pair { grid-template-columns: 1fr; } }

/* ============ howto (始め方) ============ */
.howto { max-width: var(--maxw); margin: 0 auto; }
.howto__head { text-align: center; max-width: 640px; margin: 0 auto 52px; }
.howto__head p { color: var(--muted); }
.howto__steps { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: clamp(42px, 6vw, 74px); }
.howto__step { display: grid; grid-template-columns: 0.85fr 1.45fr; gap: clamp(28px, 5vw, 62px); align-items: center; }
.howto__num {
  display: inline-grid; place-items: center; width: 42px; height: 42px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff;
  font-weight: 800; font-size: 1.15rem; margin-bottom: 16px; box-shadow: var(--shadow-sm);
}
.howto__text h3 { font-size: 1.32rem; margin-bottom: 10px; }
.howto__text p { color: var(--muted); font-size: 1.02rem; }
.howto__text code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em; background: var(--accent-soft); color: var(--accent);
  padding: 2px 7px; border-radius: 6px;
}
.howto__shot .frame { line-height: 0; }

@media (max-width: 860px) {
  .howto__step { grid-template-columns: 1fr; gap: 22px; }
}

/* ============ privacy ============ */
.privacy { text-align: center; }
.privacy__inner { max-width: 640px; margin: 0 auto; }
.privacy__inner p { color: var(--muted); font-size: 1.05rem; }

/* ============ get ============ */
.get { text-align: center; }
.get__inner {
  max-width: 680px; margin: 0 auto; padding: clamp(40px, 6vw, 70px) 30px;
  background: #fff; border: 1px solid var(--line); border-radius: 28px; box-shadow: var(--shadow);
}
.get__inner img { margin: 0 auto 18px; border-radius: 16px; }
.get__inner p { color: var(--muted); }
.get__actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin: 26px 0 10px; }
.get__steps { font-size: 0.92rem; color: var(--muted); margin: 6px 0 0; }

/* ============ footer ============ */
.foot {
  text-align: center; padding: 48px 20px 60px; border-top: 1px solid var(--line);
  color: var(--muted); background: rgba(255, 255, 255, 0.5);
}
.foot__brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 700; color: var(--ink-strong); margin-bottom: 6px; }
.foot__brand img { border-radius: 6px; }
.foot p { margin: 0; font-size: 0.92rem; }
.foot__legal { margin-top: 16px !important; font-size: 0.8rem; }
.foot__legal a { color: var(--muted); }
.foot__legal a:hover { color: var(--accent); text-decoration: underline; }

/* ============ legal / privacy page ============ */
.legal { max-width: 760px; margin: 0 auto; }
.legal__updated { color: var(--muted); font-size: 0.9rem; margin: -8px 0 8px; }
.legal h2 { font-size: 1.32rem; margin: 1.8em 0 0.5em; }
.legal h2:first-of-type { margin-top: 0.4em; }
.legal p { color: var(--ink); }
.legal ul { margin: 0 0 1.2em; padding-left: 1.35em; color: var(--ink); }
.legal li { margin-bottom: 0.5em; }
.legal strong { color: var(--ink-strong); }
.legal a { color: var(--accent); text-decoration: underline; }

/* ============ reveal animation ============ */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.8s ease, transform 0.8s cubic-bezier(.2,.7,.3,1); }
.reveal.is-in { opacity: 1; transform: none; }

/* ============ responsive ============ */
@media (max-width: 860px) {
  .hero, .feature { grid-template-columns: 1fr; }
  .hero__shot { order: -1; }
  .feature--rev .feature__text, .feature--rev .feature__media { order: 0; }
  .nav__links { display: none; }
  .band__grid, .cards__grid { grid-template-columns: 1fr; }
  .frame--lap { position: static; width: 70%; margin: 18px auto 0; }
  .feature__media--stack { padding-bottom: 0; }
}

@media (max-width: 560px) {
  .nav { gap: 10px; }
  .nav__lang { margin-left: auto; }
  .nav__cta { padding-inline: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .frame--float { animation: none; }
  * { transition: none !important; }
}