:root {
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F7F8;
  --color-bg-dark: #0F0F11;
  --color-text: #0F0F11;
  --color-text-sub: #525252;
  --color-text-mute: #A3A3A3;
  --color-line: #E5E5E5;

  --color-accent: #8B5CF6;
  --color-accent-2: #EC4899;
  --color-accent-3: #F97316;
  --color-accent-4: #06B6D4;

  --gradient-brand: linear-gradient(120deg, #8B5CF6 0%, #EC4899 40%, #F97316 75%, #06B6D4 100%);
  --gradient-purple: linear-gradient(135deg, #8B5CF6 0%, #EC4899 100%);
  --gradient-warm: linear-gradient(135deg, #EC4899 0%, #F97316 100%);

  --font-jp: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  --font-en: "Inter", "Helvetica Neue", system-ui, sans-serif;

  --max-width: 1120px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-jp);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* 日本語の自然な改行 (対応ブラウザでは禁則処理込みで意味のある単位で折り返し) */
  word-break: auto-phrase;
  line-break: strict;
  overflow-wrap: anywhere;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}


/* ========== Header ========== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s var(--ease);
}
.site-header.is-scrolled {
  border-bottom-color: var(--color-line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  line-height: 1;
}
.brand-logo {
  height: 36px;
  width: auto;
}
.site-nav ul {
  display: flex;
  gap: clamp(1rem, 3vw, 2.5rem);
}
.site-nav a {
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-text);
  position: relative;
  padding: 0.5rem 0;
  transition: color 0.3s var(--ease);
  white-space: nowrap; /* メニュー項目が2段にならないよう強制 */
}
.site-nav a::after {
  content: "";
  position: absolute;
  inset: auto 0 0.25rem 0;
  height: 2px;
  background: var(--gradient-purple);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
  border-radius: 2px;
}
.site-nav a:hover { color: var(--color-accent); }
.site-nav a:hover::after { transform: scaleX(1); }

@media (max-width: 720px) {
  .brand-logo { height: 28px; }
  .site-nav ul { gap: 0.9rem; }
  .site-nav a { font-size: 0.72rem; }
}

@media (max-width: 480px) {
  .header-inner { min-height: 60px; gap: 0.5rem; }
  .brand-logo { height: 24px; }
  .site-nav ul { gap: 0.6rem; }
  .site-nav a { font-size: 0.68rem; padding: 0.35rem 0; }
  /* 横幅がタイトな時は最低限のパディング */
  .container { padding-inline: 1rem; }
}


/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 72px;
  background: var(--color-bg);
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.hero-bg::before,
.hero-bg::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0;
  animation: orb-fade-in 2s var(--ease) 0.3s forwards;
}
.hero-bg::before {
  width: 520px;
  height: 520px;
  top: -10%;
  left: -8%;
  background: radial-gradient(circle, #8B5CF6 0%, #EC4899 60%, transparent 80%);
}
.hero-bg::after {
  width: 600px;
  height: 600px;
  bottom: -20%;
  right: -12%;
  background: radial-gradient(circle, #F97316 0%, #06B6D4 70%, transparent 85%);
  animation-delay: 0.6s;
}

@keyframes orb-fade-in {
  to { opacity: 0.35; }
}

.hero-bg svg { display: none; }

.hero-inner {
  position: relative;
  z-index: 2;
  padding-block: clamp(4rem, 10vw, 7rem);
}
.hero-eyebrow {
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 1.75rem;
  opacity: 0;
  animation: fade-up 0.9s var(--ease) 0.3s forwards;
  display: inline-block;
  padding: 0.4em 0.9em;
  border: 1px solid var(--color-accent);
  border-radius: 999px;
  background: rgba(139, 92, 246, 0.06);
}
.hero-title {
  font-family: var(--font-jp);
  font-weight: 800;
  font-size: clamp(2.4rem, 7.5vw, 5rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 2rem;
}
.hero-line {
  display: block;
  opacity: 0;
  transform: translateY(28px);
  animation: fade-up 1s var(--ease) forwards;
}
.hero-line:nth-child(1) { animation-delay: 0.55s; }
.hero-line:nth-child(2) { animation-delay: 0.8s; }
.hero-title em {
  font-style: normal;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  padding: 0 0.05em;
}
.hero-title em::after { display: none; }

.hero-lead {
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  color: var(--color-text-sub);
  line-height: 2;
  letter-spacing: 0.04em;
  opacity: 0;
  animation: fade-up 1s var(--ease) 1.05s forwards;
  font-weight: 400;
}

@keyframes fade-up {
  to { opacity: 1; transform: translateY(0); }
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 56px;
  background: var(--color-line);
  overflow: hidden;
}
.hero-scroll span {
  position: absolute;
  inset: 0;
  background: var(--gradient-purple);
  transform-origin: top;
  animation: scroll-bar 2.4s var(--ease) infinite;
}
@keyframes scroll-bar {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}


/* ========== Sections (shared) ========== */
.section {
  padding-block: clamp(5rem, 10vw, 8rem);
  position: relative;
}
.section-header {
  text-align: center;
  margin-bottom: clamp(3rem, 6vw, 5rem);
}
.section-label {
  font-family: var(--font-en);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  background: var(--gradient-purple);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 1rem;
  text-transform: uppercase;
}
.section-title {
  font-family: var(--font-jp);
  font-weight: 800;
  font-size: clamp(1.85rem, 4vw, 2.6rem);
  letter-spacing: -0.01em;
  line-height: 1.3;
  position: relative;
  display: inline-block;
  padding-bottom: 1.25rem;
}
.section-title::after {
  content: "";
  position: absolute;
  inset: auto 50% 0 50%;
  width: 40px;
  height: 3px;
  background: var(--gradient-purple);
  transform: translateX(-50%);
  border-radius: 3px;
}


/* ========== Concept ========== */
.section-concept {
  background: var(--color-bg);
}
.concept-body {
  max-width: 680px;
  margin-inline: auto;
  text-align: center;
  font-size: 1.02rem;
  line-height: 2.1;
  color: var(--color-text);
  font-weight: 400;
}
.concept-body p + p { margin-top: 1.75rem; }
.concept-body em {
  font-style: normal;
  font-family: var(--font-jp);
  font-weight: 800;
  font-size: 1.4em;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: 0;
  margin: 0 0.1em;
  vertical-align: -0.04em;
}
.concept-mark {
  margin-top: 2.5rem !important;
  padding-top: 2.5rem;
  border-top: 1px solid var(--color-line);
}


/* ========== Services ========== */
.section-services {
  background: var(--color-bg-alt);
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: clamp(1.5rem, 3vw, 2rem);
}
.service-card {
  background: var(--color-bg);
  padding: clamp(1.75rem, 3vw, 2.5rem);
  border: 1px solid var(--color-line);
  border-radius: 16px;
  position: relative;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
}
.service-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 16px;
  padding: 1px;
  background: var(--gradient-purple);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  pointer-events: none;
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px -20px rgba(139, 92, 246, 0.25);
  border-color: transparent;
}
.service-card:hover::before {
  opacity: 1;
}
.service-num {
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  background: var(--gradient-purple);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 1.25rem;
}
.service-title {
  font-family: var(--font-jp);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}
.service-lead {
  font-size: 0.88rem;
  color: var(--color-text-sub);
  letter-spacing: 0.04em;
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-line);
}
.service-list li {
  font-size: 0.92rem;
  line-height: 1.9;
  position: relative;
  padding-left: 1.25rem;
  word-break: auto-phrase;
  overflow-wrap: anywhere;
}
@media (max-width: 480px) {
  .service-list li { font-size: 0.85rem; }
}
.service-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-purple);
}


/* ========== Company ========== */
.section-company {
  background: var(--color-bg);
}
.company-table {
  max-width: 760px;
  margin-inline: auto;
}
.company-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1.5rem;
  padding: 1.5rem 0.5rem;
  border-bottom: 1px solid var(--color-line);
}
.company-row:first-child { border-top: 1px solid var(--color-line); }
.company-row dt {
  font-family: var(--font-jp);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-text);
}
.company-row dd {
  color: var(--color-text);
  line-height: 1.9;
}
@media (max-width: 640px) {
  .company-row {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }
  .company-row dt {
    font-size: 0.78rem;
    background: var(--gradient-purple);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: 0.18em;
    text-transform: uppercase;
  }
}


/* ========== Contact ========== */
.section-contact {
  background: var(--color-bg-alt);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.section-contact::before {
  content: "";
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  filter: blur(80px);
}
.contact-body {
  max-width: 560px;
  margin-inline: auto;
  position: relative;
  z-index: 1;
}
.contact-lead {
  color: var(--color-text-sub);
  margin-bottom: 2rem;
  line-height: 2;
}
.contact-mail {
  display: inline-block;
  font-family: var(--font-en);
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  font-weight: 600;
  letter-spacing: 0;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  padding: 0.5em 0;
  position: relative;
  transition: opacity 0.3s var(--ease);
}
.contact-mail::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: 2px;
  transform: scaleX(0.4);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.contact-mail:hover {
  opacity: 0.85;
}
.contact-mail:hover::after {
  transform: scaleX(1);
}
.contact-note {
  margin-top: 2rem;
  font-size: 0.82rem;
  color: var(--color-text-mute);
  letter-spacing: 0.04em;
}


/* ========== Footer ========== */
.site-footer {
  border-top: 1px solid var(--color-line);
  padding-block: 2.5rem;
  background: var(--color-bg);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}
.footer-brand {
  display: flex;
  align-items: center;
}
.footer-logo {
  height: 32px;
  width: auto;
}
.footer-copy {
  font-family: var(--font-en);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--color-text-mute);
}


/* ========== Reveal on scroll ========== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 1s var(--ease), transform 1s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}


/* ========== Reduced motion ========== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}