:root {
  --color-bg: #f4fbff;
  --color-bg-soft: #eaf7ff;
  --color-surface: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.78);
  --color-primary: #1268d6;
  --color-primary-deep: #0b4e8a;
  --color-primary-dark: #102f63;
  --color-cyan: #5ee7ff;
  --color-cyan-soft: #dff8ff;
  --color-amber: #f4b65c;
  --color-text: #102033;
  --color-muted: #5e7087;
  --color-line: #d7eaff;
  --shadow-card: 0 18px 45px rgba(18, 104, 214, 0.13);
  --shadow-button: 0 12px 28px rgba(18, 104, 214, 0.28);
  --gradient-page: linear-gradient(180deg, #f4fbff 0%, #ffffff 45%, #eef9ff 100%);
  --gradient-primary: linear-gradient(135deg, #1268d6 0%, #45cfff 100%);
  --gradient-cta: linear-gradient(135deg, rgba(18, 104, 214, 0.95), rgba(69, 207, 255, 0.86));
  --font-heading: "M PLUS Rounded 1c", "Noto Sans JP", sans-serif;
  --font-body: "Noto Sans JP", sans-serif;
  --font-en: "Outfit", sans-serif;
  --text-hero: clamp(42px, 5.2vw, 84px);
  --text-section: clamp(28px, 3.2vw, 48px);
  --text-card-title: 22px;
  --text-body: 16px;
  --text-small: 13px;
  --line-body: 1.9;
  --container: 1180px;
  --section-y: 104px;
  --section-y-mobile: 64px;
  --radius-lg: 34px;
  --radius-md: 24px;
  --radius-sm: 16px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: var(--line-body);
  background: var(--gradient-page);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -2;
  background:
    radial-gradient(circle at 12% 10%, rgba(94, 231, 255, 0.22), transparent 28%),
    radial-gradient(circle at 88% 24%, rgba(18, 104, 214, 0.14), transparent 28%),
    linear-gradient(180deg, #f4fbff 0%, #ffffff 56%, #eef9ff 100%);
}

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

a {
  color: inherit;
}

.container {
  width: min(calc(100% - 48px), var(--container));
  margin-inline: auto;
}

.site-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 30;
  padding: 14px 0;
  transition: background .2s ease, box-shadow .2s ease, backdrop-filter .2s ease;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 10px 30px rgba(16, 32, 51, 0.08);
  backdrop-filter: blur(16px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 210px;
  color: var(--color-primary-dark);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  overflow: hidden;
  border: 1px solid rgba(18, 104, 214, .16);
  border-radius: 50%;
  background: white;
  box-shadow: 0 10px 24px rgba(18, 104, 214, .14);
}

.brand-mark img {
  width: 46px;
  transform: translateY(7px) scale(1.38);
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.25;
}

.brand strong {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: .04em;
}

.brand small {
  color: var(--color-primary-dark);
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: .08em;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex: 1;
}

.nav a {
  color: var(--color-text);
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 800;
  line-height: 1.15;
  text-align: center;
  text-decoration: none;
}

.nav span {
  display: block;
  margin-top: 4px;
  color: var(--color-muted);
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 700;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 54px;
  padding: 0 28px;
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  white-space: nowrap;
}

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

.btn-primary {
  color: white;
  background: var(--gradient-primary);
  box-shadow: var(--shadow-button);
}

.btn-secondary {
  color: var(--color-primary-deep);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(18, 104, 214, 0.26);
  box-shadow: 0 12px 28px rgba(18, 104, 214, .08);
}

.btn-light {
  color: var(--color-primary-deep);
  background: #fff;
  box-shadow: 0 16px 36px rgba(16, 32, 51, .16);
}

.btn-outline-light {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, .56);
  background: rgba(255, 255, 255, .13);
}

.btn-green {
  color: #fff;
  background: linear-gradient(135deg, #27bf58, #7fe28d);
  box-shadow: 0 12px 26px rgba(39, 191, 88, .28);
}

.hero {
  position: relative;
  min-height: 720px;
  padding: 126px 0 64px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(244, 251, 255, .98) 0%, rgba(244, 251, 255, .93) 43%, rgba(244, 251, 255, .54) 100%),
    url("assets/hero_background.png") center / cover no-repeat;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -8% -55px -8%;
  height: 180px;
  z-index: -1;
  background: linear-gradient(180deg, transparent, var(--color-bg));
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(380px, .95fr);
  align-items: center;
  gap: 40px;
}

.eyebrow,
.section-kicker {
  color: var(--color-primary-deep);
  font-weight: 900;
  letter-spacing: .08em;
}

.hero h1 {
  margin: 18px 0 22px;
  font-family: var(--font-heading);
  font-size: var(--text-hero);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: .06em;
  color: var(--color-primary-dark);
}

.hero-lead {
  margin: 0;
  color: var(--color-primary-dark);
  font-size: 20px;
  font-weight: 700;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 36px;
}

.trust-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.trust-chips span {
  display: inline-flex;
  align-items: center;
  min-height: 54px;
  padding: 0 20px;
  color: var(--color-primary-dark);
  font-weight: 800;
  border: 1px solid rgba(18, 104, 214, .14);
  border-radius: 18px;
  background: rgba(255, 255, 255, .82);
  box-shadow: 0 14px 30px rgba(18, 104, 214, .1);
  backdrop-filter: blur(14px);
}

.hero-visual {
  position: relative;
  min-height: 560px;
  display: grid;
  place-items: end center;
}

.kohaku-hero {
  position: relative;
  z-index: 3;
  width: min(455px, 90%);
  filter: drop-shadow(0 24px 35px rgba(18, 104, 214, .24));
}

.hero-platform {
  position: absolute;
  right: 10%;
  bottom: 24px;
  width: 74%;
  height: 96px;
  border: 1px solid rgba(94, 231, 255, .5);
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(94, 231, 255, .28), transparent 64%),
    rgba(255, 255, 255, .36);
  box-shadow: 0 0 48px rgba(94, 231, 255, .34);
}

.holo-card {
  position: absolute;
  z-index: 4;
  width: 178px;
  padding: 16px;
  color: var(--color-primary-deep);
  border: 1px solid rgba(18, 104, 214, .18);
  border-radius: 18px;
  background: rgba(255, 255, 255, .46);
  box-shadow: 0 16px 40px rgba(18, 104, 214, .12);
  backdrop-filter: blur(14px);
}

.holo-card small {
  display: block;
  margin-bottom: 8px;
  color: #6ca5d8;
  font-family: var(--font-en);
  font-weight: 800;
}

.holo-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  font-weight: 800;
  line-height: 1.8;
}

.holo-card li::before {
  content: "✓";
  margin-right: 7px;
  color: var(--color-primary);
}

.task-card {
  top: 96px;
  right: -10px;
}

.create-card {
  right: 12px;
  bottom: 118px;
}

.section {
  padding: var(--section-y) 0;
}

.section-heading {
  max-width: 780px;
  margin-bottom: 44px;
}

.section-heading.center {
  margin-inline: auto;
  text-align: center;
}

.section-kicker {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-en);
  font-size: 13px;
}

.section-heading h2,
.message-copy h2,
.final-panel h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-section);
  font-weight: 800;
  line-height: 1.38;
  letter-spacing: .04em;
}

.section-heading h2 span,
.message-copy h2 span {
  color: var(--color-primary);
}

.glass-card {
  background: var(--color-surface-glass);
  border: 1px solid rgba(18, 104, 214, 0.12);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(14px);
}

.problems {
  padding-top: 70px;
}

.problems .container {
  padding: 56px;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 0 30%, rgba(94, 231, 255, .16), transparent 28%),
    linear-gradient(180deg, rgba(255, 255, 255, .86), rgba(234, 247, 255, .72));
}

.problem-grid,
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}

.problem-card,
.feature-card {
  min-height: 232px;
  padding: 28px 24px;
  text-align: center;
}

.problem-card img {
  width: 76px;
  height: 76px;
  margin: 0 auto 16px;
  border-radius: 50%;
}

.problem-card h3,
.feature-card h3,
.project-card h3,
.step-card h3,
.recommend-card h3,
.product-card h3 {
  margin: 0 0 10px;
  color: var(--color-primary-dark);
  font-family: var(--font-heading);
  font-size: var(--text-card-title);
  font-weight: 800;
  line-height: 1.42;
}

.problem-card p,
.feature-card p,
.project-card p,
.step-card p,
.recommend-card p,
.product-card p,
.faq-item p {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.75;
}

.message-inner {
  display: grid;
  grid-template-columns: .78fr 1.22fr;
  align-items: center;
  gap: 60px;
}

.message-visual {
  position: relative;
  display: grid;
  min-height: 260px;
  place-items: center;
}

.message-visual img {
  position: relative;
  z-index: 2;
  width: 220px;
  filter: drop-shadow(0 20px 28px rgba(18, 104, 214, .18));
}

.orbit {
  position: absolute;
  width: 280px;
  height: 180px;
  border: 2px solid rgba(94, 231, 255, .42);
  border-radius: 50%;
  transform: rotate(-18deg);
  box-shadow: 0 0 40px rgba(94, 231, 255, .18);
}

.message-copy p {
  max-width: 680px;
  color: var(--color-muted);
  font-size: 17px;
}

.features {
  padding-top: 20px;
}

.feature-icon {
  display: grid;
  width: 54px;
  height: 54px;
  margin: 0 auto 18px;
  place-items: center;
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 900;
  border-radius: 18px;
  background: var(--color-cyan-soft);
}

.projects {
  padding-top: 76px;
}

.project-grid,
.product-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 16px;
}

.project-card {
  min-height: 230px;
  padding: 22px 18px;
  text-align: center;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease;
}

.project-card:hover,
.product-card:hover {
  transform: translateY(-4px);
}

.project-icon {
  display: grid;
  width: 52px;
  height: 52px;
  margin: 0 auto 14px;
  place-items: center;
  color: var(--color-primary);
  font-family: var(--font-en);
  font-size: 24px;
  font-weight: 900;
  border-radius: 17px;
  background: #eef9ff;
}

.line-icon {
  color: #19bd4f;
}

.project-card strong {
  display: inline-flex;
  margin-top: 15px;
  color: var(--color-primary);
  font-size: 13px;
}

.discord-band {
  padding: 20px 0 72px;
}

.discord-panel {
  display: grid;
  grid-template-columns: auto minmax(0, 1.2fr) minmax(0, .9fr) auto;
  align-items: center;
  gap: 24px;
  padding: 28px;
  overflow: hidden;
  color: white;
  border-radius: 32px;
  background:
    radial-gradient(circle at 10% 50%, rgba(255, 255, 255, .28), transparent 24%),
    linear-gradient(135deg, #1268d6, #45cfff);
  box-shadow: 0 24px 56px rgba(18, 104, 214, .28);
}

.discord-mark {
  display: grid;
  width: 86px;
  height: 86px;
  place-items: center;
  font-size: 48px;
  border-radius: 28px;
  background: rgba(255, 255, 255, .16);
}

.discord-copy h2 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 28px;
}

.discord-copy p {
  margin: 0;
  color: rgba(255, 255, 255, .85);
  font-size: 14px;
  line-height: 1.7;
}

.discord-features {
  display: grid;
  gap: 8px;
}

.discord-features span {
  padding: 8px 12px;
  color: var(--color-primary-dark);
  font-size: 13px;
  font-weight: 800;
  border-radius: 999px;
  background: rgba(255, 255, 255, .82);
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.step-card {
  position: relative;
  min-height: 230px;
  padding: 52px 22px 24px;
}

.step-number {
  position: absolute;
  top: -18px;
  left: 24px;
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  color: white;
  font-family: var(--font-en);
  font-size: 24px;
  font-weight: 800;
  border-radius: 50%;
  background: var(--gradient-primary);
  box-shadow: var(--shadow-button);
}

.recommended {
  padding-top: 40px;
}

.recommend-grid,
.voice-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.recommend-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px;
}

.recommend-card img {
  width: 82px;
  height: 82px;
  object-fit: cover;
  border-radius: 50%;
  background: #fff;
}

.recommend-card:last-child img {
  object-fit: contain;
  transform: scale(1.25) translateY(8px);
}

.voices {
  padding-top: 48px;
}

.voices .section-heading h2 span {
  color: var(--color-muted);
  font-size: .58em;
}

.voice-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.voice-card {
  position: relative;
  margin: 0;
  padding: 36px 30px 26px;
}

.voice-card::before {
  content: "“";
  position: absolute;
  top: 8px;
  left: 22px;
  color: rgba(18, 104, 214, .24);
  font-family: serif;
  font-size: 60px;
  line-height: 1;
}

.voice-card p {
  margin: 0 0 16px;
  color: var(--color-primary-dark);
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
}

.voice-card cite {
  color: var(--color-muted);
  font-size: 13px;
  font-style: normal;
}

.products {
  padding-top: 48px;
}

.product-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.product-card {
  padding: 28px;
  transition: transform .18s ease;
}

.product-card a {
  display: inline-flex;
  margin-top: 18px;
  color: var(--color-primary);
  font-weight: 900;
  text-decoration: none;
}

.status {
  display: inline-flex;
  margin-bottom: 16px;
  padding: 5px 12px;
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 900;
  border-radius: 999px;
  background: var(--color-cyan-soft);
}

.status.soon {
  color: #a16a00;
  background: #fff3d9;
}

.faq-inner {
  display: grid;
  grid-template-columns: .42fr .58fr;
  gap: 46px;
  align-items: start;
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item {
  padding: 0;
  overflow: hidden;
}

.faq-item summary {
  position: relative;
  padding: 22px 58px 22px 24px;
  color: var(--color-primary-dark);
  font-weight: 900;
  cursor: pointer;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 24px;
  transform: translateY(-50%);
  color: var(--color-primary);
  font-size: 24px;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  padding: 0 24px 24px;
}

.final-cta {
  padding: 44px 0 70px;
}

.final-panel {
  position: relative;
  overflow: hidden;
  padding: 52px;
  color: white;
  border-radius: 34px;
  background:
    linear-gradient(135deg, rgba(7, 52, 112, .68), rgba(18, 104, 214, .5)),
    url("assets/final_cta_background.png") center / cover no-repeat;
  box-shadow: 0 24px 70px rgba(18, 104, 214, .32);
}

.final-panel h2 {
  max-width: 900px;
  color: white;
}

.final-panel p {
  margin: 14px 0 30px;
  color: rgba(255, 255, 255, .88);
  font-size: 18px;
  font-weight: 700;
}

.final-panel .section-kicker {
  color: rgba(255, 255, 255, .84);
}

.final-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.site-footer {
  padding: 0 0 34px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.operator {
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 580px;
  padding: 16px 20px;
}

.operator img {
  width: 72px;
  height: 72px;
  object-fit: cover;
  border-radius: 50%;
}

.operator strong {
  display: block;
  color: var(--color-primary-dark);
}

.operator p {
  margin: 2px 0 0;
  color: var(--color-muted);
  font-size: 13px;
}

.footer-links {
  display: grid;
  gap: 8px;
  text-align: right;
}

.footer-links a {
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 900;
  text-decoration: none;
}

.copyright {
  margin: 26px 0 0;
  color: var(--color-muted);
  font-size: 12px;
  text-align: center;
}

@media (max-width: 1080px) {
  .nav {
    display: none;
  }

  .header-cta {
    min-height: 46px;
    padding: 0 18px;
    font-size: 13px;
  }

  .hero-inner,
  .message-inner,
  .faq-inner {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 760px;
  }

  .hero-visual {
    min-height: 460px;
  }

  .problem-grid,
  .feature-grid,
  .project-grid,
  .step-grid,
  .recommend-grid,
  .product-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .discord-panel {
    grid-template-columns: auto 1fr;
  }

  .discord-features,
  .discord-panel .btn {
    grid-column: 2;
  }

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

@media (max-width: 720px) {
  .container {
    width: min(calc(100% - 40px), var(--container));
  }

  .brand {
    min-width: auto;
  }

  .brand strong {
    font-size: 16px;
  }

  .brand small {
    font-size: 11px;
  }

  .header-cta {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: 106px 0 42px;
  }

  .hero-inner {
    gap: 18px;
  }

  .hero h1 {
    font-size: clamp(38px, 13vw, 58px);
    line-height: 1.18;
  }

  .eyebrow {
    font-size: 13px;
  }

  .hero-lead {
    font-size: 17px;
  }

  .hero-actions,
  .final-actions {
    display: grid;
  }

  .btn {
    width: 100%;
    min-height: 52px;
  }

  .trust-chips {
    display: grid;
    gap: 10px;
  }

  .trust-chips span {
    min-height: 48px;
    justify-content: center;
    text-align: center;
  }

  .hero-visual {
    min-height: 390px;
    place-items: center;
  }

  .kohaku-hero {
    width: min(320px, 88vw);
  }

  .holo-card {
    display: none;
  }

  .hero-platform {
    right: auto;
    bottom: 26px;
    width: 86%;
    height: 64px;
  }

  .section {
    padding: var(--section-y-mobile) 0;
  }

  .problems .container {
    width: calc(100% - 24px);
    padding: 40px 18px;
    border-radius: 28px;
  }

  .problem-grid,
  .feature-grid,
  .project-grid,
  .step-grid,
  .recommend-grid,
  .product-grid {
    grid-template-columns: 1fr;
  }

  .problem-card,
  .feature-card {
    min-height: auto;
  }

  .message-inner {
    gap: 22px;
  }

  .message-visual {
    min-height: 210px;
  }

  .message-visual img {
    width: 170px;
  }

  .orbit {
    width: 220px;
    height: 132px;
  }

  .discord-panel {
    grid-template-columns: 1fr;
    padding: 26px 20px;
    text-align: center;
  }

  .discord-mark {
    margin: 0 auto;
  }

  .discord-features,
  .discord-panel .btn {
    grid-column: auto;
  }

  .step-card {
    min-height: auto;
    padding: 46px 22px 24px;
  }

  .recommend-card {
    align-items: flex-start;
  }

  .final-panel {
    padding: 36px 22px;
    border-radius: 26px;
  }

  .footer-inner {
    display: grid;
  }

  .footer-links {
    text-align: left;
  }
}