@import url('https://fonts.googleapis.com/css2?family=Inter:wght@500;600;700;800;900&family=Noto+Sans+JP:wght@400;500;600;700;800;900&display=swap');

:root {
  --ink: #171717;
  --muted: #666666;
  --line: #e9e9e9;
  --bg: #ffffff;
  --soft: #fffdf5;
  --primary: #f5c400;
  --primary2: #ffd83d;
  --cyan: #ffe876;
  --pink: #ffcd1f;
  --shadow: 0 18px 50px rgba(0, 0, 0, .08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
}

a { color: inherit; text-decoration: none; }

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.86);
  border-bottom: 1px solid rgba(221,229,242,.8);
  backdrop-filter: blur(16px);
}

.header-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-family: Inter, sans-serif;
  font-weight: 900;
  letter-spacing: -.04em;
}

.brand-mark {
  font-size: 25px;
  color: var(--ink);
}

.brand-radio {
  font-size: 21px;
  background: linear-gradient(135deg, var(--primary), var(--pink));
  -webkit-background-clip: text;
  color: transparent;
}

.header-cta {
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--ink);
  color: white;
  font-weight: 800;
  font-size: 14px;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 92px 0 86px;
  background:
    radial-gradient(circle at 85% 22%, rgba(245,196,0,.14), transparent 32%),
    linear-gradient(180deg, #fff 0%, #f8fbff 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .4;
  background-image:
    linear-gradient(rgba(0,0,0,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,.035) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: linear-gradient(to bottom, black, transparent 88%);
}

.hero-glow {
  position: absolute;
  width: 340px;
  height: 340px;
  filter: blur(90px);
  opacity: .22;
  border-radius: 50%;
}

.hero-glow-a { background: var(--cyan); right: 4%; top: 10%; }
.hero-glow-b { background: var(--pink); right: 22%; bottom: 0; }

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  gap: 70px;
  align-items: center;
}

.eyebrow, .section-kicker, .mini-label {
  font-family: Inter, sans-serif;
  font-weight: 900;
  letter-spacing: .16em;
}

.eyebrow {
  color: var(--primary);
  font-size: 12px;
  margin: 0 0 18px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(54px, 7vw, 92px);
  line-height: .98;
  letter-spacing: -.065em;
  font-weight: 900;
}

.hero h1 span {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), var(--primary2) 55%, var(--pink));
  -webkit-background-clip: text;
  color: transparent;
}

.hero-lead {
  max-width: 620px;
  margin: 28px 0 22px;
  font-size: 17px;
  color: var(--muted);
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 28px;
}

.hero-badges span {
  padding: 7px 12px;
  border: 1px solid #e7e7e7;
  border-radius: 999px;
  background: rgba(255,255,255,.8);
  color: #555;
  font-size: 13px;
  font-weight: 700;
}

.hero-actions, .final-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border-radius: 14px;
  font-weight: 800;
  transition: .2s ease;
}

.btn:hover { transform: translateY(-2px); }

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary2));
  box-shadow: 0 10px 30px rgba(245,196,0,.28);
}

.btn-secondary {
  background: #fff;
  border: 1px solid var(--line);
}

.btn-light {
  background: #fff;
  color: var(--ink);
}

.btn-large {
  min-height: 58px;
  padding: 0 28px;
}

.hero-note {
  margin-top: 12px;
  font-size: 12px;
  color: #777;
}

.radio-card {
  position: relative;
  padding: 20px;
  border: 1px solid rgba(255,255,255,.95);
  border-radius: 30px;
  background: linear-gradient(145deg, rgba(255,255,255,.94), rgba(245,248,255,.86));
  box-shadow: 0 35px 90px rgba(0,0,0,.14);
  transform: rotate(1.5deg);
}

.radio-card::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 30px;
  padding: 1px;
  background: linear-gradient(135deg, rgba(245,196,0,.30), rgba(255,216,61,.18), transparent);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  pointer-events: none;
}

.radio-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2px 3px 14px;
}

.live-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ff4f69;
  box-shadow: 0 0 0 6px rgba(255,79,105,.10);
}

.live-label {
  margin-left: 8px;
  font-family: Inter, sans-serif;
  font-size: 12px;
  font-weight: 900;
  color: #ff4f69;
  letter-spacing: .12em;
}

.frequency {
  font: 800 12px/1 Inter, sans-serif;
  color: #777;
}

.cover-art {
  min-height: 280px;
  border-radius: 22px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background:
    radial-gradient(circle at 75% 25%, rgba(255,255,255,.9), transparent 25%),
    linear-gradient(145deg, #fff7cb 0%, #ffe57a 52%, #fff0a1 100%);
}

.cover-icon {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: rgba(255,255,255,.7);
  font-size: 29px;
  font-weight: 900;
  box-shadow: 0 10px 30px rgba(0,0,0,.10);
}

.cover-copy strong {
  display: block;
  font: 900 28px/1 Inter, sans-serif;
  letter-spacing: -.04em;
}

.cover-copy span {
  font-size: 13px;
  color: #66728a;
}

.wave {
  height: 58px;
  margin: 18px 2px 12px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.wave i {
  flex: 1;
  height: var(--h);
  min-height: 7px;
  border-radius: 99px;
  background: linear-gradient(to top, var(--primary), var(--cyan));
  animation: wave 1.6s ease-in-out infinite alternate;
  animation-delay: calc(var(--h) * -0.015);
}

@keyframes wave {
  from { transform: scaleY(.55); opacity: .65; }
  to { transform: scaleY(1); opacity: 1; }
}

.radio-tools {
  display: flex;
  gap: 8px;
}

.radio-tools span {
  flex: 1;
  padding: 10px 8px;
  text-align: center;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: white;
  font: 800 11px/1 Inter, sans-serif;
  color: #666;
}

.impact-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.impact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.impact-item {
  padding: 34px 20px;
  text-align: center;
  border-right: 1px solid var(--line);
}

.impact-item:last-child { border-right: 0; }

.impact-item strong {
  display: block;
  font: 900 clamp(28px, 4vw, 48px)/1 Inter, sans-serif;
  letter-spacing: -.05em;
  color: var(--primary);
}

.impact-item span {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
}

.section {
  padding: 100px 0;
}

.section-heading {
  max-width: 760px;
  margin: 0 auto 48px;
  text-align: center;
}

.section-heading.left {
  margin-left: 0;
  text-align: left;
}

.section-kicker {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 12px;
}

.section-heading h2 {
  margin: 0 0 18px;
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.15;
  letter-spacing: -.045em;
}

.section-heading p:not(.section-kicker) {
  margin: 0;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feature-card {
  position: relative;
  min-height: 285px;
  padding: 28px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: #fff;
  box-shadow: 0 8px 28px rgba(0,0,0,.045);
}

.feature-card.featured {
  color: #fff;
  background: linear-gradient(145deg, #6577ff, #7654fb);
  border-color: transparent;
}

.feature-card.wide {
  min-height: 220px;
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 190px 1fr;
  align-items: center;
  gap: 28px;
  background: linear-gradient(120deg, #fffef8, #fff9dc);
}

.feature-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: #fff7cf;
  color: var(--primary);
  font: 900 21px/1 Inter, sans-serif;
}

.featured .feature-icon {
  color: #fff;
  background: rgba(255,255,255,.16);
}

.mini-label {
  margin: 22px 0 7px;
  font-size: 10px;
  color: #8a8a8a;
}

.featured .mini-label { color: rgba(255,255,255,.72); }

.feature-card h3 {
  margin: 0 0 12px;
  font-size: 21px;
  letter-spacing: -.025em;
}

.feature-card p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.featured p { color: rgba(255,255,255,.86); }
.featured p strong { color: #fff; }

.feature-card small {
  display: block;
  margin-top: 12px;
  color: #888;
  font-size: 11px;
}

.big-number {
  position: absolute;
  right: 22px;
  bottom: 18px;
  font: 900 62px/1 Inter, sans-serif;
  letter-spacing: -.07em;
  opacity: .18;
}

.big-number span { font-size: .5em; }

.wide-visual {
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  border-radius: 20px;
  background: linear-gradient(145deg, #fff6bf, #ffe77a 55%, #fff3b0);
}

.picture-icon {
  width: 76px;
  height: 76px;
  display: grid;
  place-items: center;
  border-radius: 20px;
  background: rgba(255,255,255,.72);
  box-shadow: var(--shadow);
  color: var(--primary);
  font-size: 38px;
}

.usecases {
  background: var(--soft);
}

.usecase-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.usecase {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 18px;
  align-items: start;
  padding: 26px;
  border: 1px solid #e9e9e9;
  border-radius: 20px;
  background: #fff;
}

.usecase:last-child {
  grid-column: 1 / -1;
}

.usecase-no {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: #fff7cf;
  color: var(--primary);
  font: 900 12px/1 Inter, sans-serif;
}

.usecase h3 {
  margin: 1px 0 7px;
  font-size: 18px;
}

.usecase p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.step-card {
  position: relative;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
}

.step-card:not(:last-child)::after {
  content: "→";
  position: absolute;
  top: 50%;
  right: -23px;
  transform: translateY(-50%);
  z-index: 2;
  color: #999;
  font-size: 22px;
  font-weight: 900;
}

.step-card span {
  display: block;
  margin-bottom: 18px;
  font: 900 11px/1 Inter, sans-serif;
  letter-spacing: .12em;
  color: var(--primary);
}

.step-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 20px;
}

.step-card p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.final-cta {
  padding: 0 0 90px;
}

.final-cta-box {
  position: relative;
  overflow: hidden;
  padding: 76px 70px;
  border-radius: 34px;
  color: white;
  text-align: center;
  background:
    radial-gradient(circle at 15% 15%, rgba(255,216,61,.28), transparent 28%),
    radial-gradient(circle at 85% 25%, rgba(245,196,0,.20), transparent 30%),
    linear-gradient(135deg, #161616 0%, #252525 58%, #3b3b3b 100%);
}

.final-cta-box h2 {
  margin: 10px 0 18px;
  font-size: clamp(37px, 5vw, 58px);
  line-height: 1.18;
  letter-spacing: -.045em;
}

.final-cta-box > p:not(.section-kicker) {
  margin: 0 0 28px;
  color: rgba(255,255,255,.82);
}

.final-cta .section-kicker { color: #ffe876; }

.final-actions {
  justify-content: center;
}

.final-cta small {
  display: block;
  margin-top: 22px;
  color: rgba(255,255,255,.58);
  font-size: 11px;
}

footer {
  padding: 34px 0;
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-inner p {
  margin: 0;
  color: #888;
  font-size: 12px;
}

.sp-only { display: none; }

@media (max-width: 900px) {
  .hero {
    padding-top: 66px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 46px;
  }

  .radio-card {
    max-width: 620px;
    margin: 0 auto;
    transform: none;
  }

  .feature-grid {
    grid-template-columns: 1fr 1fr;
  }

  .feature-card.featured {
    grid-column: span 2;
  }

  .impact-grid {
    grid-template-columns: 1fr 1fr;
  }

  .impact-item:nth-child(2) { border-right: 0; }
  .impact-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }

  .step-card:not(:last-child)::after { display: none; }
}

@media (max-width: 680px) {
  .container {
    width: min(100% - 28px, 1120px);
  }

  .header-inner { height: 64px; }
  .brand-mark { font-size: 22px; }
  .brand-radio { font-size: 18px; }

  .header-cta {
    padding: 9px 13px;
    font-size: 12px;
  }

  .hero {
    padding: 54px 0 58px;
  }

  .hero h1 {
    font-size: clamp(48px, 15vw, 68px);
  }

  .hero-lead {
    font-size: 15px;
  }

  .hero-actions {
    display: grid;
  }

  .btn {
    width: 100%;
  }

  .cover-art {
    min-height: 225px;
  }

  .section {
    padding: 74px 0;
  }

  .section-heading {
    margin-bottom: 34px;
  }

  .feature-grid,
  .usecase-list,
  .step-grid {
    grid-template-columns: 1fr;
  }

  .feature-card.featured,
  .feature-card.wide,
  .usecase:last-child {
    grid-column: auto;
  }

  .feature-card.wide {
    grid-template-columns: 1fr;
  }

  .wide-visual {
    max-width: 160px;
  }

  .impact-item {
    padding: 26px 10px;
  }

  .impact-item strong {
    font-size: 34px;
  }

  .impact-item span {
    padding: 0 6px;
    font-size: 11px;
  }

  .usecase {
    grid-template-columns: 44px 1fr;
    padding: 20px;
  }

  .usecase-no {
    width: 44px;
    height: 44px;
    border-radius: 13px;
  }

  .final-cta {
    padding: 0 0 56px;
  }

  .final-cta-box {
    padding: 56px 22px;
    border-radius: 24px;
  }

  .footer-inner {
    gap: 14px;
    align-items: flex-start;
    flex-direction: column;
  }

  .sp-only { display: block; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .wave i { animation: none; }
  .btn { transition: none; }
}


/* ===== STST top-page inspired header / footer ===== */
.site-header {
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid #ececec;
  box-shadow: 0 4px 18px rgba(0,0,0,.04);
}

.header-inner {
  gap: 22px;
}

.brand-logo-slot {
  flex: 0 0 auto;
}

.logo-img {
  display: block;
  width: 150px;
  height: auto;
  object-fit: contain;
}

.logo-placeholder {
  min-width: 138px;
  height: 42px;
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed #d6d6d6;
  border-radius: 10px;
  color: #8a8a8a;
  background: #fafafa;
  font: 800 12px/1 Inter, sans-serif;
  letter-spacing: .12em;
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  position: relative;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 700;
  color: #333;
  transition: background .2s ease, color .2s ease;
}

.site-nav a:hover {
  background: #fff6c5;
  color: #111;
}

.site-nav .nav-apply {
  background: #ffd633;
  color: #111;
}

.header-cta {
  background: #171717;
  color: #fff;
}

.hero {
  background:
    radial-gradient(circle at 85% 22%, rgba(245,196,0,.16), transparent 32%),
    linear-gradient(180deg, #fff 0%, #fffdf3 100%);
}

.hero h1 span {
  background: linear-gradient(135deg, #f1b900 0%, #ffd633 52%, #f0b600 100%);
  -webkit-background-clip: text;
  color: transparent;
}

.btn-primary {
  color: #151515;
  background: linear-gradient(135deg, #f2bd00, #ffd83d);
  box-shadow: 0 10px 30px rgba(245,196,0,.28);
}

.btn-primary:hover {
  filter: brightness(.98);
}

.impact-item strong,
.section-kicker,
.eyebrow,
.step-card span,
.usecase-no {
  color: #d9a900;
}

.feature-card.featured {
  color: #171717;
  background: linear-gradient(145deg, #ffd633, #f4bd00);
}

.featured .feature-icon {
  color: #171717;
  background: rgba(255,255,255,.48);
}

.featured .mini-label,
.featured p,
.featured p strong {
  color: #262626;
}

.big-number {
  color: #111;
  opacity: .12;
}

.feature-icon {
  background: #fff5bd;
  color: #c99600;
}

.radio-card {
  background: linear-gradient(145deg, rgba(255,255,255,.97), rgba(255,250,227,.92));
}

.cover-art {
  background:
    radial-gradient(circle at 75% 25%, rgba(255,255,255,.9), transparent 25%),
    linear-gradient(145deg, #fff6c4 0%, #ffe16d 52%, #fff0a8 100%);
}

.wave i {
  background: linear-gradient(to top, #e1ab00, #ffd633);
}

.radio-tools span {
  color: #555;
}

.feature-card.wide {
  background: linear-gradient(120deg, #fffef9, #fff8d8);
}

.wide-visual {
  background: linear-gradient(145deg, #fff5bd, #ffe06b 55%, #fff0aa);
}

.picture-icon {
  color: #c79200;
}

.final-cta-box {
  color: #171717;
  background:
    radial-gradient(circle at 15% 15%, rgba(255,255,255,.42), transparent 28%),
    radial-gradient(circle at 85% 25%, rgba(255,241,166,.34), transparent 30%),
    linear-gradient(135deg, #f1bb00 0%, #ffd633 58%, #ffe46b 100%);
}

.final-cta-box > p:not(.section-kicker),
.final-cta small {
  color: rgba(23,23,23,.72);
}

.final-cta .section-kicker {
  color: #6f5600;
}

.final-cta .btn-primary {
  background: #171717;
  color: #fff;
  box-shadow: none;
}

.final-cta .btn-light {
  border: 1px solid rgba(0,0,0,.16);
}

.site-footer {
  padding: 28px 0;
  border-top: 1px solid #e7e7e7;
  background: #fff;
}

.footer-inner {
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 12px;
  text-align: center;
}

.footer-inner p {
  margin: 0;
  color: #555;
  font-size: 12px;
}

.footer-links {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  font-size: 12px;
  color: #555;
}

.footer-links a:hover {
  text-decoration: underline;
}

.footer-links span {
  color: #aaa;
}

@media (max-width: 900px) {
  .site-nav {
    display: none;
  }

  .header-inner {
    justify-content: space-between;
  }
}

@media (max-width: 680px) {
  .logo-placeholder {
    min-width: 112px;
    height: 38px;
  }

  .header-cta {
    padding: 9px 12px;
  }

  .footer-inner {
    flex-direction: column;
  }
}