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

html {
  scroll-behavior: smooth;
}

body,
h1,
h2,
h3,
p,
ul,
li {
  margin: 0;
  padding: 0;
}

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

:root {
  --sumi: #080809;
  --sumi-panel: #141516;

  --washi: #f7f0df;
  --washi-deep: #eadbb8;
  --washi-ink: #17130f;

  --gold: #d8ad2f;
  --gold-bright: #ffd86b;
  --gold-deep: #9b7119;

  --vermillion: #b3312b;
  --vermillion-bright: #d84537;

  --jade: #1f8a5b;
  --jade-bright: #54c28a;

  --text: #f8f1df;
  --text-muted: #c9bea6;
  --text-dark: #17130f;

  --border: rgba(255, 216, 107, 0.28);
  --paper-border: rgba(23, 19, 15, 0.22);

  --shadow-dark: 0 20px 60px rgba(0, 0, 0, 0.45);
  --shadow-gold: 0 0 30px rgba(216, 173, 47, 0.34);
}

[data-theme="light"] {
  --sumi: #f7f0df;
  --sumi-panel: #fff8e8;

  --washi: #fff8e8;
  --washi-deep: #eadbb8;
  --washi-ink: #17130f;

  --text: #17130f;
  --text-muted: #5e5140;
  --text-dark: #17130f;

  --border: rgba(155, 113, 25, 0.3);
  --paper-border: rgba(23, 19, 15, 0.18);

  --shadow-dark: 0 18px 45px rgba(23, 19, 15, 0.14);
  --shadow-gold: 0 0 24px rgba(216, 173, 47, 0.24);
}

body {
  min-height: 100vh;
  background: radial-gradient(
      circle at 82% 8%,
      rgba(255, 216, 107, 0.22),
      transparent 28%
    ),
    radial-gradient(circle at 8% 18%, rgba(179, 49, 43, 0.18), transparent 24%),
    radial-gradient(circle at 72% 72%, rgba(31, 138, 91, 0.13), transparent 26%),
    linear-gradient(135deg, #050506, var(--sumi));
  color: var(--text);
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.7;
}

[data-theme="light"] body {
  background: radial-gradient(
      circle at 82% 8%,
      rgba(216, 173, 47, 0.22),
      transparent 28%
    ),
    radial-gradient(circle at 8% 18%, rgba(179, 49, 43, 0.1), transparent 24%),
    radial-gradient(circle at 72% 72%, rgba(31, 138, 91, 0.1), transparent 26%),
    var(--sumi);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.16;
  background: repeating-linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.035) 0,
      rgba(255, 255, 255, 0.035) 1px,
      transparent 1px,
      transparent 9px
    ),
    repeating-linear-gradient(
      0deg,
      rgba(255, 255, 255, 0.025) 0,
      rgba(255, 255, 255, 0.025) 1px,
      transparent 1px,
      transparent 11px
    );
}

a {
  color: inherit;
}

.site-header,
main,
.site-footer {
  padding-left: 24px;
  padding-right: 24px;
}

.section-inner {
  width: min(1120px, 100%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(8, 8, 9, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
  box-shadow: 0 8px 34px rgba(0, 0, 0, 0.32);
}

[data-theme="light"] .site-header {
  background: rgba(247, 240, 223, 0.94);
}

.header-inner {
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.logo-img {
  width: 80px;
  height: 80px;
  object-fit: contain;
  filter: drop-shadow(0 0 12px rgba(216, 173, 47, 0.55))
    drop-shadow(0 0 22px rgba(255, 216, 107, 0.22));
}

.logo-text {
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--gold-bright);
  text-shadow: 0 0 18px rgba(216, 173, 47, 0.35);
}

[data-theme="light"] .logo-text {
  color: var(--washi-ink);
  text-shadow: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.language-toggle {
  display: flex;
  gap: 6px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 216, 107, 0.06);
}

.lang-link {
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 800;
  transition: 0.22s ease;
}

.lang-link.active {
  background: linear-gradient(
    135deg,
    var(--gold-bright),
    var(--gold),
    var(--gold-deep)
  );
  color: #17130f;
  box-shadow: var(--shadow-gold);
}

.theme-toggle,
.menu-toggle {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: radial-gradient(
      circle at 30% 25%,
      rgba(255, 216, 107, 0.18),
      transparent 40%
    ),
    var(--sumi-panel);
  color: var(--gold-bright);
  cursor: pointer;
}

[data-theme="light"] .theme-toggle,
[data-theme="light"] .menu-toggle {
  color: var(--washi-ink);
  background: var(--washi);
}

.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--gold-bright);
  margin: 0 auto;
}

[data-theme="light"] .menu-toggle span {
  background: var(--washi-ink);
}

.site-nav {
  display: none;
  flex-direction: column;
  position: absolute;
  top: 90px;
  left: 0;
  right: 0;
  background: var(--sumi-panel);
  border-bottom: 1px solid var(--border);
}

.site-nav.active {
  display: flex;
}

.nav-link {
  padding: 1rem;
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-weight: 800;
}

.nav-link:hover,
.nav-link.active {
  color: var(--gold-bright);
}

[data-theme="light"] .nav-link {
  color: var(--washi-ink);
}

.hero-section {
  padding: 6.5rem 0;
  position: relative;
}

.hero-section::before {
  content: "";
  position: absolute;
  top: 12%;
  right: 8%;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(255, 216, 107, 0.38),
    transparent 68%
  );
  filter: blur(28px);
  animation: kamiGlow 6s ease-in-out infinite;
  pointer-events: none;
}

@keyframes kamiGlow {
  0%,
  100% {
    opacity: 0.45;
    transform: scale(1);
  }

  50% {
    opacity: 0.85;
    transform: scale(1.08);
  }
}

.hero-grid {
  display: grid;
  gap: 3rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.eyebrow {
  color: var(--jade-bright);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 2.6px;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(2.3rem, 7vw, 5rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
  color: var(--text);
}

[data-theme="light"] h1 {
  color: var(--washi-ink);
}

h1::first-letter {
  color: var(--gold-bright);
}

h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  margin-bottom: 1rem;
  color: var(--text-dark);
}

h3 {
  margin-bottom: 0.75rem;
}

p {
  color: var(--text-muted);
}

.hero-text {
  margin-top: 1.5rem;
  margin-bottom: 2rem;
  max-width: 680px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.button {
  display: inline-block;
  padding: 15px 30px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 900;
  transition: 0.25s ease;
}

.primary-button {
  background: linear-gradient(
    135deg,
    var(--gold-bright),
    var(--gold),
    var(--gold-deep)
  );
  color: #17130f;
  box-shadow: 0 0 24px rgba(216, 173, 47, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.primary-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 38px rgba(216, 173, 47, 0.65),
    inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.secondary-button {
  border: 2px solid var(--vermillion);
  color: var(--text);
  background: rgba(179, 49, 43, 0.1);
}

.secondary-button:hover {
  background: var(--vermillion);
  color: #fff;
  box-shadow: 0 0 24px rgba(179, 49, 43, 0.45);
}

[data-theme="light"] .secondary-button {
  color: var(--washi-ink);
}

.feature-card .secondary-button {
  color: var(--washi-ink) !important;
}

.feature-card .secondary-button:hover {
  color: #ffffff !important;
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.visual-card {
  width: 320px;
  height: 320px;
  border-radius: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.visual-card,
.feature-card,
.content-section .section-inner {
  background: radial-gradient(
      circle at 18% 18%,
      rgba(255, 255, 255, 0.9),
      transparent 18%
    ),
    repeating-linear-gradient(
      105deg,
      rgba(23, 19, 15, 0.035) 0,
      rgba(23, 19, 15, 0.035) 1px,
      transparent 1px,
      transparent 7px
    ),
    repeating-linear-gradient(
      18deg,
      rgba(179, 49, 43, 0.025) 0,
      rgba(179, 49, 43, 0.025) 1px,
      transparent 1px,
      transparent 13px
    ),
    linear-gradient(135deg, var(--washi), var(--washi-deep));
  color: var(--text-dark);
  border: 1px solid var(--paper-border);
  box-shadow: var(--shadow-dark);
}

.visual-card::before {
  content: "";
  position: absolute;
  inset: 18px;
  border: 3px solid var(--gold);
  border-radius: 24px;
  box-shadow: inset 0 0 24px rgba(216, 173, 47, 0.18);
}

.visual-card::after {
  display: none;
}

.visual-card span {
  font-size: 5.2rem;
  color: var(--jade);
  z-index: 1;
  text-shadow: 0 0 14px rgba(31, 138, 91, 0.28);
}

.content-section {
  padding: 5.5rem 0;
}

.content-section .section-inner {
  padding: 2.7rem;
  border-radius: 26px;
  position: relative;
}

.content-section .section-inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 2rem;
  right: 2rem;
  height: 5px;
  background: linear-gradient(
    90deg,
    var(--vermillion),
    var(--gold),
    var(--jade)
  );
  border-radius: 0 0 999px 999px;
}

.alt-section {
  background: transparent;
}

.card-grid {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
}

.feature-card {
  padding: 2rem;
  border-radius: 22px;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 7px;
  background: var(--vermillion);
}

.feature-card:nth-child(2)::before {
  background: var(--gold);
}

.feature-card:nth-child(3)::before {
  background: var(--jade);
}

.feature-card h3 {
  color: var(--text-dark);
}

.feature-card p,
.content-section p {
  color: #5c4d3b;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding-top: 2.2rem;
  padding-bottom: 2.2rem;
  background: rgba(8, 8, 9, 0.38);
}

[data-theme="light"] .site-footer {
  background: rgba(247, 240, 223, 0.55);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-nav {
  display: flex;
  gap: 1rem;
}

.footer-nav a {
  text-decoration: none;
  color: var(--gold-bright);
  font-weight: 800;
}

[data-theme="light"] .footer-nav a {
  color: var(--gold-deep);
}

@media (max-width: 520px) {
  .site-header,
  main,
  .site-footer {
    padding-left: 20px;
    padding-right: 20px;
  }

  .logo-img {
    width: 64px;
    height: 64px;
  }

  .header-inner {
    min-height: 78px;
  }

  .site-nav {
    top: 78px;
  }

  .language-toggle {
    display: flex;
  }

  .logo-text {
    display: none;
  }

  .lang-link {
    padding: 6px 10px;
    font-size: 0.82rem;
  }

  .hero-section {
    padding: 4.4rem 0;
  }

  .visual-card {
    width: 280px;
    height: 280px;
  }

  .content-section .section-inner {
    padding: 1.7rem;
  }
}

@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }

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

@media (min-width: 1024px) {
  .menu-toggle {
    display: none;
  }

  .site-nav {
    display: flex !important;
    position: static;
    flex-direction: row;
    background: transparent;
    border: none;
    gap: 1rem;
  }

  .nav-link {
    border: none;
    padding: 0.5rem 1rem;
  }
  }
}