/* ============================================
   MCP Build LP — Stylesheet
   Color: Dark Blue + White, Enterprise Tone
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --color-primary: #0A1628;
  --color-primary-light: #1E3A5F;
  --color-primary-mid: #15294a;
  --color-accent: #3B82F6;
  --color-accent-light: #60A5FA;
  --color-accent-dark: #2563EB;
  --color-accent-glow: rgba(59, 130, 246, 0.15);
  --color-white: #FFFFFF;
  --color-gray-50: #F8FAFC;
  --color-gray-100: #F1F5F9;
  --color-gray-200: #E2E8F0;
  --color-gray-300: #CBD5E1;
  --color-gray-400: #94A3B8;
  --color-gray-500: #64748B;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1E293B;
  --color-gray-900: #0F172A;
  --color-success: #10B981;
  --color-error: #EF4444;

  --font-ja: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  --font-en: "Inter", sans-serif;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
  --shadow-xl: 0 24px 64px rgba(0,0,0,0.16);

  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  --header-height: 72px;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-ja);
  color: var(--color-gray-800);
  background: var(--color-white);
  line-height: 1.8;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul, ol { list-style: none; }

/* ---------- Utility ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.container--narrow {
  max-width: 880px;
}

.sp-only { display: none; }
.pc-only { display: inline; }

@media (max-width: 768px) {
  .sp-only { display: inline; }
  .pc-only { display: none; }
}

/* ---------- Animations ---------- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.spinner {
  animation: spin 1s linear infinite;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-ja);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  text-decoration: none;
  line-height: 1;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
}
.btn--primary:hover {
  background: var(--color-accent-dark);
  box-shadow: 0 6px 24px rgba(59, 130, 246, 0.4);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  color: var(--color-white);
  border: 1.5px solid rgba(255,255,255,0.3);
}
.btn--ghost:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.6);
}

.btn--sm {
  padding: 8px 20px;
  font-size: 0.875rem;
}

.btn--lg {
  padding: 16px 36px;
  font-size: 1rem;
}

.btn--full {
  width: 100%;
}

/* ---------- HEADER ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: transparent;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.header.scrolled {
  background: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.05);
}

.header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-white);
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 1.25rem;
  z-index: 10;
}

.header__logo-icon {
  font-size: 1.5rem;
  color: var(--color-accent);
}

.header__logo-accent {
  color: var(--color-accent);
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.header__nav-link {
  color: rgba(255,255,255,0.7);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}
.header__nav-link:hover {
  color: var(--color-white);
}

.header__cta {
  z-index: 10;
}

.header__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 10;
}

.header__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.header__hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.header__hamburger.active span:nth-child(2) {
  opacity: 0;
}
.header__hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 1024px) {
  .header__nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 22, 40, 0.98);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
  }
  .header__nav.open {
    opacity: 1;
    pointer-events: auto;
  }
  .header__nav-list {
    flex-direction: column;
    gap: var(--space-2xl);
  }
  .header__nav-link {
    font-size: 1.25rem;
  }
  .header__hamburger {
    display: flex;
  }
  .header__cta {
    display: none;
  }
}

/* ---------- HERO ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--color-primary);
  overflow: hidden;
  padding: calc(var(--header-height) + var(--space-3xl)) 0 var(--space-3xl);
}

.hero__bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
}
.hero__glow--1 {
  width: 600px;
  height: 600px;
  background: rgba(59, 130, 246, 0.12);
  top: -200px;
  right: -100px;
}
.hero__glow--2 {
  width: 400px;
  height: 400px;
  background: rgba(59, 130, 246, 0.08);
  bottom: -100px;
  left: -100px;
}

.hero__inner {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 16px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-full);
  color: var(--color-accent-light);
  font-size: 0.8125rem;
  font-weight: 500;
  margin-bottom: var(--space-2xl);
  font-family: var(--font-en);
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero__title {
  font-size: clamp(1.5rem, 4.5vw, 3.25rem);
  font-weight: 900;
  color: var(--color-white);
  line-height: 1.4;
  margin-bottom: var(--space-xl);
  letter-spacing: 0.02em;
}

.hero__title-accent {
  background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: clamp(0.9375rem, 1.5vw, 1.125rem);
  color: var(--color-gray-400);
  line-height: 1.8;
  margin-bottom: var(--space-3xl);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-4xl);
  flex-wrap: wrap;
}

.hero__stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xl);
  flex-wrap: wrap;
}

.hero__stat {
  text-align: center;
}

.hero__stat-number {
  display: block;
  font-family: var(--font-en);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent-light);
  margin-bottom: 4px;
}

.hero__stat-label {
  font-size: 0.8125rem;
  color: var(--color-gray-400);
}

.hero__stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(255,255,255,0.1);
}

@media (max-width: 768px) {
  .hero__stats {
    gap: var(--space-lg);
    flex-wrap: nowrap;
    justify-content: center;
  }

  .hero__stat-divider {
    height: 32px;
  }

  .hero__stat-number {
    font-size: 1.0625rem;
  }

  .hero__stat-label {
    font-size: 0.6875rem;
  }
}

.hero__scroll-indicator {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-gray-500);
  font-size: 0.6875rem;
  font-family: var(--font-en);
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-gray-500), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

@media (max-width: 768px) {
  .hero__scroll-indicator {
    display: none;
  }
}

/* ---------- SECTIONS (Common) ---------- */
.section {
  padding: var(--space-5xl) 0;
}

.section--light {
  background: var(--color-white);
}

.section--gray {
  background: var(--color-gray-50);
}

.section--dark {
  background: var(--color-primary);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.section__label {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}
.section__label--light {
  color: var(--color-accent-light);
}

.section__title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  color: var(--color-gray-900);
  line-height: 1.4;
  margin-bottom: var(--space-lg);
}
.section__title--light {
  color: var(--color-white);
}

.section__desc {
  font-size: 1rem;
  color: var(--color-gray-500);
  line-height: 1.8;
  max-width: 680px;
  margin: 0 auto;
}
.section__desc--light {
  color: var(--color-gray-400);
}

/* ---------- PAIN POINTS ---------- */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.pain-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
}
.pain-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg), 0 0 0 1px var(--color-accent);
  transform: translateY(-4px);
}

.pain-card__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-glow);
  border-radius: var(--radius-md);
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
}
.pain-card__icon svg {
  width: 28px;
  height: 28px;
}

.pain-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-sm);
}

.pain-card__desc {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  line-height: 1.7;
}

@media (max-width: 768px) {
  .pain-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- SOLUTION ---------- */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.solution-card {
  position: relative;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
}
.solution-card:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-4px);
}

.solution-card__number {
  font-family: var(--font-en);
  font-size: 3rem;
  font-weight: 800;
  color: rgba(59, 130, 246, 0.1);
  line-height: 1;
  margin-bottom: var(--space-md);
}

.solution-card__icon {
  color: var(--color-accent-light);
  margin-bottom: var(--space-lg);
}

.solution-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-md);
  line-height: 1.5;
}

.solution-card__desc {
  font-size: 0.9375rem;
  color: var(--color-gray-400);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.solution-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.solution-card__list li {
  font-size: 0.8125rem;
  color: var(--color-gray-300);
  padding-left: var(--space-lg);
  position: relative;
}
.solution-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  transform: translateY(-50%);
}

@media (max-width: 768px) {
  .solution-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- ABOUT MCP ---------- */
.mcp-architecture {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: var(--space-4xl);
  padding: var(--space-3xl);
  background: var(--color-gray-50);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-gray-200);
}

.mcp-arch__row {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
}
.mcp-arch__row--spread {
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.mcp-arch__arrow {
  color: var(--color-gray-400);
  padding: var(--space-sm) 0;
}

.mcp-arch__box {
  padding: var(--space-lg) var(--space-2xl);
  border-radius: var(--radius-md);
  text-align: center;
  border: 2px solid;
  min-width: 180px;
}

.mcp-arch__box--host {
  border-color: var(--color-gray-300);
  background: var(--color-white);
}
.mcp-arch__box--client {
  border-color: var(--color-gray-300);
  background: var(--color-white);
}
.mcp-arch__box--server {
  border-color: var(--color-accent);
  background: rgba(59, 130, 246, 0.05);
}
.mcp-arch__box--highlight {
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}
.mcp-arch__box--resource {
  border-color: var(--color-gray-200);
  background: var(--color-white);
  min-width: 140px;
  padding: var(--space-md) var(--space-lg);
}

.mcp-arch__box-label {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-gray-800);
  margin-bottom: 4px;
  font-family: var(--font-en);
}

.mcp-arch__badge {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  margin-left: var(--space-sm);
  font-family: var(--font-ja);
}

.mcp-arch__box-desc {
  font-size: 0.8125rem;
  color: var(--color-gray-500);
}
.mcp-arch__box-desc small {
  font-size: 0.6875rem;
  color: var(--color-gray-400);
}

.mcp-capabilities {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.mcp-cap {
  display: flex;
  gap: var(--space-xl);
  align-items: flex-start;
  padding: var(--space-xl);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}
.mcp-cap:hover {
  background: var(--color-gray-50);
}

.mcp-cap__icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-glow);
  border-radius: var(--radius-md);
  color: var(--color-accent);
}

.mcp-cap__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-xs);
  font-family: var(--font-en);
}

.mcp-cap__desc {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  line-height: 1.7;
}

.mcp-adopters {
  text-align: center;
  padding: var(--space-2xl);
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-200);
}

.mcp-adopters__label {
  font-size: 0.8125rem;
  color: var(--color-gray-400);
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.mcp-adopters__logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xl);
  flex-wrap: wrap;
}

.mcp-adopters__logo {
  font-family: var(--font-en);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-gray-300);
  transition: color var(--transition-fast);
}
.mcp-adopters__logo:hover {
  color: var(--color-gray-600);
}

@media (max-width: 768px) {
  .mcp-architecture {
    padding: var(--space-xl);
  }
  .mcp-arch__box {
    min-width: 140px;
    padding: var(--space-md) var(--space-lg);
  }
  .mcp-arch__row--spread {
    gap: var(--space-md);
  }
  .mcp-arch__box--resource {
    min-width: 100px;
    padding: var(--space-sm) var(--space-md);
  }
  .mcp-cap {
    flex-direction: column;
    gap: var(--space-md);
  }
}

/* ---------- DEMO ---------- */
.demo-video {
  max-width: 900px;
  margin: 0 auto;
}

.demo-video__wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-gray-900);
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255,255,255,0.1);
  aspect-ratio: 16 / 9;
}

.demo-video__player,
.demo-video__iframe {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.demo-video__iframe {
  position: absolute;
  top: 0;
  left: 0;
}

.demo-video__caption {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-gray-400);
  margin-top: var(--space-lg);
}

/* ---------- FLOW ---------- */
.flow-timeline {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
}

.flow-timeline::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-gray-200);
}

.flow-step {
  position: relative;
  display: flex;
  gap: var(--space-2xl);
  padding-bottom: var(--space-3xl);
}
.flow-step:last-child {
  padding-bottom: 0;
}

.flow-step__marker {
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.flow-step__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  color: var(--color-white);
  border-radius: 50%;
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 1.125rem;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.flow-step__content {
  flex: 1;
  padding-top: var(--space-sm);
}

.flow-step__duration {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-glow);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-sm);
}

.flow-step__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-sm);
}

.flow-step__desc {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.flow-step__tags {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-gray-600);
  background: var(--color-gray-100);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-gray-200);
}

@media (max-width: 768px) {
  .flow-step {
    gap: var(--space-lg);
  }
}

/* ---------- USE CASES ---------- */
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.usecase-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
}
.usecase-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.usecase-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.usecase-card__icon {
  color: var(--color-accent);
}
.usecase-card__icon svg {
  width: 36px;
  height: 36px;
}

.usecase-card__industry {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-glow);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.usecase-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-sm);
}

.usecase-card__desc {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.usecase-card__systems {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.usecase-card__system {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-gray-600);
  background: var(--color-gray-100);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-gray-200);
}

@media (max-width: 768px) {
  .usecase-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- BENEFITS ---------- */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.benefit-card {
  text-align: center;
  padding: var(--space-2xl);
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}
.benefit-card:hover {
  background: rgba(255,255,255,0.06);
  transform: translateY(-4px);
}

.benefit-card__metric {
  font-family: var(--font-en);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent-light);
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

.benefit-card__unit {
  font-size: 1.5rem;
}

.benefit-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.benefit-card__desc {
  font-size: 0.8125rem;
  color: var(--color-gray-400);
  line-height: 1.7;
}

@media (max-width: 1024px) {
  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .benefits-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- SECURITY ---------- */
.security-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.security-item {
  padding: var(--space-2xl);
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
}
.security-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.security-item__icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.security-item__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-sm);
}

.security-item__desc {
  font-size: 0.875rem;
  color: var(--color-gray-500);
  line-height: 1.7;
}

@media (max-width: 768px) {
  .security-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- FAQ ---------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.faq-item {
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-white);
  transition: box-shadow var(--transition-fast);
}
.faq-item:hover {
  box-shadow: var(--shadow-sm);
}

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  width: 100%;
  padding: var(--space-xl);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-ja);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-gray-900);
  line-height: 1.5;
}

.faq-item__icon {
  flex-shrink: 0;
  color: var(--color-gray-400);
  transition: transform var(--transition-base);
}

.faq-item.active .faq-item__icon {
  transform: rotate(180deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base), padding var(--transition-base);
}

.faq-item.active .faq-item__answer {
  max-height: 500px;
}

.faq-item__answer p {
  padding: 0 var(--space-xl) var(--space-xl);
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  line-height: 1.8;
}

/* ---------- CONTACT FORM ---------- */
.contact-form {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
}

.contact-form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.contact-form__field {
  display: flex;
  flex-direction: column;
}

.contact-form__field--full {
  margin-bottom: var(--space-xl);
}

.contact-form__label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-gray-200);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.contact-form__required {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-accent-light);
  background: rgba(59, 130, 246, 0.15);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.contact-form__input,
.contact-form__select,
.contact-form__textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-md);
  font-family: var(--font-ja);
  font-size: 0.9375rem;
  color: var(--color-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.contact-form__input::placeholder,
.contact-form__textarea::placeholder {
  color: var(--color-gray-500);
}

.contact-form__input:focus,
.contact-form__select:focus,
.contact-form__textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.contact-form__input.error,
.contact-form__select.error,
.contact-form__textarea.error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.contact-form__select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%2394A3B8' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.contact-form__select option {
  background: var(--color-primary);
  color: var(--color-white);
}

.contact-form__textarea {
  resize: vertical;
  min-height: 120px;
}

.contact-form__checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.875rem;
  color: var(--color-gray-300);
  cursor: pointer;
}

.contact-form__checkbox {
  display: none;
}

.contact-form__checkbox-custom {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.2);
  border-radius: 4px;
  transition: all var(--transition-fast);
  position: relative;
}

.contact-form__checkbox:checked + .contact-form__checkbox-custom {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.contact-form__checkbox:checked + .contact-form__checkbox-custom::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 6px;
  width: 5px;
  height: 9px;
  border: solid var(--color-white);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.contact-form__link {
  color: var(--color-accent-light);
  text-decoration: underline;
}

.contact-form__error {
  font-size: 0.75rem;
  color: var(--color-error);
  margin-top: 4px;
  min-height: 1rem;
}

.contact-form__submit {
  margin-top: var(--space-xl);
}

.contact-form__message {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  text-align: center;
}

.contact-form__message.success {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--color-success);
}

.contact-form__message.error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--color-error);
}

@media (max-width: 768px) {
  .contact-form {
    padding: var(--space-xl);
  }
  .contact-form__row {
    grid-template-columns: 1fr;
  }
}

/* ---------- COMPANY ---------- */
.company-table {
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-200);
}

.company-table table {
  width: 100%;
  border-collapse: collapse;
}

.company-table th,
.company-table td {
  padding: var(--space-lg) var(--space-xl);
  text-align: left;
  font-size: 0.9375rem;
  border-bottom: 1px solid var(--color-gray-200);
}

.company-table tr:last-child th,
.company-table tr:last-child td {
  border-bottom: none;
}

.company-table th {
  width: 160px;
  font-weight: 600;
  color: var(--color-gray-700);
  background: var(--color-gray-50);
}

.company-table td {
  color: var(--color-gray-600);
}

.company-table td a {
  color: var(--color-accent);
}
.company-table td a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .company-table th {
    width: 100px;
  }
  .company-table th,
  .company-table td {
    padding: var(--space-md);
    font-size: 0.875rem;
  }
}

/* ---------- FOOTER ---------- */
.footer {
  background: var(--color-gray-900);
  padding: var(--space-4xl) 0 var(--space-xl);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-white);
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: var(--space-md);
}

.footer__desc {
  font-size: 0.8125rem;
  color: var(--color-gray-500);
  line-height: 1.8;
}

.footer__links {
  display: flex;
  gap: var(--space-4xl);
}

.footer__link-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-gray-300);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.footer__link-group ul li {
  margin-bottom: var(--space-sm);
}

.footer__link-group ul li a {
  font-size: 0.875rem;
  color: var(--color-gray-500);
  transition: color var(--transition-fast);
}
.footer__link-group ul li a:hover {
  color: var(--color-white);
}

.footer__bottom {
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-gray-600);
}

@media (max-width: 768px) {
  .footer__inner {
    flex-direction: column;
    gap: var(--space-2xl);
  }
  .footer__links {
    gap: var(--space-2xl);
  }
}

/* ---------- Screen Reader Only (LLMO / Accessibility) ---------- */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  clip-path: inset(50%) !important;
  white-space: nowrap !important;
  border: 0 !important;
  visibility: hidden !important;
}