:root {
  --ink: #10141a;
  --ink-soft: #4a5563;
  --mist: #e8eef2;
  --surface: #f7fafb;
  --line: rgba(16, 20, 26, 0.1);
  --jade: #0b7a75;
  --jade-deep: #04514d;
  --jade-glow: rgba(11, 122, 117, 0.45);
  --gold: #c9892e;
  --night: #0c1218;
  --night-2: #152028;
  --max: 72rem;
  --doc: 46rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans JP", system-ui, sans-serif;
  color: var(--ink);
  background: var(--surface);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--jade-deep);
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--jade);
}

.wrap {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

/* ——— Header ——— */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  transition: background 220ms var(--ease), border-color 220ms var(--ease);
  border-bottom: 1px solid transparent;
}

.site-header.is-solid {
  background: rgba(247, 250, 251, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--line);
}

.site-header__inner {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
  min-height: 4.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: inherit;
  font-family: Syne, "Noto Sans JP", sans-serif;
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -0.03em;
}

.brand img {
  width: 1.85rem;
  height: 1.85rem;
  border-radius: 0.48rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.15rem;
  font-size: 0.9rem;
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--ink);
}

.hero-on-dark .brand,
.hero-on-dark .nav a {
  color: rgba(248, 250, 252, 0.92);
}

.hero-on-dark .nav a:hover {
  color: #fff;
}

/* ——— Hero ——— */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: stretch;
  overflow: hidden;
  color: #f4f7f8;
  background:
    radial-gradient(ellipse 80% 55% at 70% 20%, rgba(11, 122, 117, 0.35), transparent 60%),
    radial-gradient(ellipse 50% 40% at 15% 80%, rgba(201, 137, 46, 0.18), transparent 55%),
    linear-gradient(165deg, #071016 0%, var(--night) 45%, #101820 100%);
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 20%, transparent 75%);
  animation: grid-drift 28s linear infinite;
  pointer-events: none;
}

@keyframes grid-drift {
  from { transform: translate3d(0, 0, 0); }
  to { transform: translate3d(-72px, -36px, 0); }
}

.hero__inner {
  position: relative;
  z-index: 1;
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto;
  padding: 7.5rem 0 4rem;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem 3rem;
  align-items: center;
}

@media (max-width: 960px) {
  .hero__inner {
    grid-template-columns: 1fr;
    padding-top: 6.5rem;
  }
}

.hero__copy {
  animation: rise 800ms var(--ease) both;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(22px); }
  to { opacity: 1; transform: none; }
}

.hero__mark {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1.35rem;
}

.hero__mark img {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 0.95rem;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.12), 0 20px 50px rgba(0, 0, 0, 0.35);
}

.hero__wordmark {
  margin: 0;
  font-family: Syne, "Noto Sans JP", sans-serif;
  font-weight: 800;
  font-size: clamp(2.8rem, 8vw, 4.6rem);
  letter-spacing: -0.05em;
  line-height: 0.92;
}

.hero h1 {
  margin: 0 0 0.9rem;
  max-width: 11em;
  font-family: Syne, "Noto Sans JP", sans-serif;
  font-weight: 700;
  font-size: clamp(1.45rem, 3.2vw, 2.05rem);
  letter-spacing: -0.035em;
  line-height: 1.28;
}

.hero__lede {
  margin: 0 0 1.75rem;
  max-width: 32rem;
  color: rgba(232, 236, 241, 0.72);
  font-size: 1.02rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.7rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  transition: transform 180ms var(--ease), background 180ms var(--ease), border-color 180ms var(--ease);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn--primary {
  background: #dff5f3;
  color: var(--jade-deep);
}

.btn--primary:hover {
  background: #fff;
  color: var(--jade-deep);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.22);
  color: #f4f7f8;
}

.btn--ghost:hover {
  border-color: rgba(255, 255, 255, 0.5);
  color: #fff;
}

.btn--solid {
  background: var(--jade);
  color: #fff;
}

.btn--solid:hover {
  background: var(--jade-deep);
  color: #fff;
}

.btn--line {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.btn--line:hover {
  border-color: var(--jade);
  color: var(--jade-deep);
}

/* ——— Phone mock ——— */
.hero__device {
  justify-self: end;
  animation: rise 900ms var(--ease) 120ms both;
}

@media (max-width: 960px) {
  .hero__device {
    justify-self: center;
  }
}

.phone {
  width: min(100%, 292px);
  border-radius: 2rem;
  padding: 0.7rem;
  background: linear-gradient(160deg, #2a3440, #121820);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.08),
    0 40px 80px rgba(0, 0, 0, 0.45);
  animation: float-y 6.5s ease-in-out infinite;
}

@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.phone__screen {
  border-radius: 1.45rem;
  overflow: hidden;
  background: linear-gradient(180deg, #eef3f5, #f8fbfc);
  color: var(--ink);
  min-height: 520px;
  display: flex;
  flex-direction: column;
}

.phone__bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1rem 0.45rem;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.phone__title {
  padding: 0.15rem 1rem 0.7rem;
  font-family: Syne, "Noto Sans JP", sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.phone__chips {
  display: flex;
  gap: 0.35rem;
  padding: 0 1rem 0.75rem;
}

.chip {
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  background: rgba(11, 122, 117, 0.12);
  color: var(--jade-deep);
  font-size: 0.68rem;
  font-weight: 600;
}

.chip--muted {
  background: rgba(16, 20, 26, 0.06);
  color: var(--ink-soft);
}

.cover-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.45rem;
  padding: 0 1rem;
}

.cover {
  aspect-ratio: 2 / 3;
  border-radius: 0.55rem;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.35), transparent 40%),
    linear-gradient(180deg, var(--c1, #1f6f6a), var(--c2, #0d2f2d));
}

.cover:nth-child(1) { --c1: #1a7a74; --c2: #12343f; }
.cover:nth-child(2) { --c1: #3d5a80; --c2: #1b2838; }
.cover:nth-child(3) { --c1: #b0893c; --c2: #3a2a12; }
.cover:nth-child(4) { --c1: #5b6b7a; --c2: #222831; }
.cover:nth-child(5) { --c1: #2f6b5a; --c2: #142822; }
.cover:nth-child(6) { --c1: #6a4c7a; --c2: #261828; }

.phone__list {
  margin-top: 0.9rem;
  padding: 0 1rem;
  display: grid;
  gap: 0.45rem;
}

.phone__row {
  display: grid;
  grid-template-columns: 2.2rem 1fr auto;
  gap: 0.55rem;
  align-items: center;
  padding: 0.45rem 0.5rem;
  border-radius: 0.65rem;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(16, 20, 26, 0.06);
  font-size: 0.72rem;
}

.phone__row .dot {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 0.45rem;
  background: linear-gradient(145deg, #2a8f88, #13443f);
}

.phone__row strong {
  display: block;
  font-size: 0.74rem;
}

.phone__row span {
  color: var(--ink-soft);
  font-size: 0.65rem;
}

.stars {
  color: var(--gold);
  letter-spacing: 0.05em;
  font-size: 0.7rem;
}

.phone__nav {
  margin-top: auto;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.2rem;
  padding: 0.65rem 0.45rem 0.85rem;
  border-top: 1px solid rgba(16, 20, 26, 0.08);
  background: rgba(255, 255, 255, 0.55);
  text-align: center;
  font-size: 0.58rem;
  color: var(--ink-soft);
}

.phone__nav b {
  display: block;
  width: 1.1rem;
  height: 1.1rem;
  margin: 0 auto 0.2rem;
  border-radius: 0.3rem;
  background: rgba(16, 20, 26, 0.12);
}

.phone__nav .on {
  color: var(--jade-deep);
  font-weight: 700;
}

.phone__nav .on b {
  background: var(--jade);
}

/* ——— Feature stages ——— */
.stage {
  padding: clamp(3.5rem, 8vw, 6.5rem) 0;
  border-bottom: 1px solid var(--line);
}

.stage:nth-child(even) {
  background: linear-gradient(180deg, #f2f6f8 0%, var(--surface) 100%);
}

.stage__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem 3.5rem;
  align-items: center;
}

.stage__grid--flip .stage__visual {
  order: -1;
}

@media (max-width: 900px) {
  .stage__grid,
  .stage__grid--flip .stage__visual {
    grid-template-columns: 1fr;
    order: initial;
  }
}

.stage__kicker {
  margin: 0 0 0.55rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--jade);
}

.stage h2 {
  margin: 0 0 0.75rem;
  font-family: Syne, "Noto Sans JP", sans-serif;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  letter-spacing: -0.035em;
  line-height: 1.25;
  max-width: 14em;
}

.stage p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
  max-width: 36rem;
}

.stage ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
}

.stage li {
  position: relative;
  padding-left: 1.15rem;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

.stage li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--jade);
  box-shadow: 0 0 0 4px rgba(11, 122, 117, 0.12);
}

.visual-panel {
  position: relative;
  min-height: 18rem;
  border-radius: 1.5rem;
  overflow: hidden;
  border: 1px solid var(--line);
  color: #e8eef2;
  background:
    radial-gradient(circle at 78% 18%, rgba(11, 122, 117, 0.35), transparent 42%),
    radial-gradient(circle at 20% 85%, rgba(201, 137, 46, 0.18), transparent 40%),
    linear-gradient(150deg, #121a22, #0a1016 70%);
  padding: 1.4rem;
  display: grid;
  gap: 0.75rem;
  align-content: center;
}

.vp-line {
  display: flex;
  gap: 0.65rem;
  align-items: center;
}

.vp-poster {
  width: 3.4rem;
  height: 4.6rem;
  border-radius: 0.55rem;
  flex: 0 0 auto;
  background: linear-gradient(160deg, #2f8f87, #16353a);
}

.vp-poster.alt {
  background: linear-gradient(160deg, #6d7f95, #243040);
}

.vp-poster.warm {
  background: linear-gradient(160deg, #c9a04a, #4a3514);
}

.vp-meta {
  flex: 1;
}

.vp-meta strong {
  display: block;
  font-family: Syne, "Noto Sans JP", sans-serif;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  margin-bottom: 0.2rem;
}

.vp-meta span {
  display: block;
  font-size: 0.78rem;
  color: rgba(232, 236, 241, 0.62);
}

.vp-pill {
  display: inline-flex;
  margin-top: 0.35rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: rgba(223, 245, 243, 0.14);
  color: #dff5f3;
  font-size: 0.68rem;
  font-weight: 600;
}

.vp-chat {
  display: grid;
  gap: 0.45rem;
  margin-top: 0.35rem;
}

.bubble {
  max-width: 80%;
  padding: 0.55rem 0.75rem;
  border-radius: 0.9rem;
  font-size: 0.8rem;
  background: rgba(255, 255, 255, 0.08);
}

.bubble.me {
  justify-self: end;
  background: rgba(11, 122, 117, 0.45);
}

.vp-code {
  font-family: Syne, "Noto Sans JP", sans-serif;
  font-size: 1.55rem;
  letter-spacing: 0.28em;
  font-weight: 700;
  margin: 0.35rem 0;
}

/* ——— Closing ——— */
.closing {
  padding: clamp(4rem, 9vw, 7rem) 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(11, 122, 117, 0.16), transparent 60%),
    var(--surface);
  text-align: center;
}

.closing h2 {
  margin: 0 0 0.7rem;
  font-family: Syne, "Noto Sans JP", sans-serif;
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  letter-spacing: -0.035em;
}

.closing p {
  margin: 0 auto 1.5rem;
  max-width: 34rem;
  color: var(--ink-soft);
}

.closing__ops {
  margin-top: 2rem;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

/* ——— Legal docs ——— */
.doc-page {
  padding: 6.5rem 0 2rem;
  background:
    radial-gradient(900px 420px at 10% -10%, rgba(11, 122, 117, 0.1), transparent 55%),
    var(--surface);
}

.doc-shell {
  width: min(100% - 2.5rem, var(--doc));
  margin-inline: auto;
  animation: rise 650ms var(--ease) both;
}

.doc-shell h1 {
  margin: 0 0 0.35rem;
  font-family: Syne, "Noto Sans JP", sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.45rem);
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.doc-shell__meta {
  margin: 0 0 1.25rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.doc-panel {
  padding: 1.6rem 1.45rem 1.8rem;
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  background: rgba(255, 255, 255, 0.78);
}

.doc-panel h2 {
  margin: 1.55rem 0 0.45rem;
  font-family: Syne, "Noto Sans JP", sans-serif;
  font-size: 1.08rem;
}

.doc-panel h2:first-of-type {
  margin-top: 0.35rem;
}

.doc-panel p,
.doc-panel ul {
  margin: 0 0 0.75rem;
  color: var(--ink-soft);
}

.doc-panel ul {
  padding-left: 1.15rem;
}

.doc-panel hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2rem 0;
}

.lang-label {
  display: inline-block;
  margin-bottom: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: rgba(11, 122, 117, 0.12);
  color: var(--jade-deep);
  font-size: 0.75rem;
  font-weight: 700;
}

.support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 0.75rem;
}

/* ——— Footer ——— */
.site-footer {
  padding: 2rem 0 2.4rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.86rem;
  background: #eef3f5;
}

.site-footer__inner {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.85rem;
}

.site-footer a {
  color: var(--ink-soft);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--jade-deep);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}