/* ========== RESET & BASE ========== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --navy: #0a0e27;
  --navy-light: #111638;
  --navy-card: #151a3a;
  --blue: #60a5fa;
  --purple: #a78bfa;
  --gradient: linear-gradient(135deg, #60a5fa, #a78bfa);
  --gradient-bg: linear-gradient(135deg, #0a0e27 0%, #1a1050 50%, #0a0e27 100%);
  --text: #e2e8f0;
  --text-muted: #c0cbda;
  --white: #ffffff;
  --border: rgba(255, 255, 255, 0.08);
  --glass: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.06);
  --radius: 16px;
  --radius-sm: 8px;
  --font-jp: 'Noto Sans JP', sans-serif;
  --font-en: 'Inter', sans-serif;
  --font-serif: 'DM Serif Display', serif;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-jp);
  background: var(--navy);
  color: var(--text);
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body.no-scroll {
  overflow: hidden;
}

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

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

ul {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.pc-only {
  display: inline;
}

/* ========== FADE-IN ANIMATION ========== */
.fade-in {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.9s cubic-bezier(0.23, 1, 0.32, 1), transform 0.9s cubic-bezier(0.23, 1, 0.32, 1);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== CHAR-BY-CHAR ANIMATION ========== */
.char-animate > span,
.char-animate .gradient-text span {
  display: inline-block;
  opacity: 0;
  transform: translateY(20px);
  animation: charFadeIn 0.5s cubic-bezier(0.23, 1, 0.32, 1) forwards;
  animation-delay: calc(var(--char-index) * 0.04s);
}

.char-animate .gradient-text span {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.char-animate br {
  display: block;
}

@keyframes charFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========== GRADIENT TEXT ========== */
.gradient-text {
  color: #333; /* フォールバック：非対応ブラウザではこの色で表示 */
  background: linear-gradient(90deg, #色1, #色2); /* 実際のグラデーション色に置換 */
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 36px;
  border-radius: 100px;
  font-weight: 700;
  font-size: 1rem;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  font-family: var(--font-jp);
}

.btn-primary {
  background: var(--gradient);
  color: var(--white);
  box-shadow: 0 4px 24px rgba(96, 165, 250, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 8px 32px rgba(96, 165, 250, 0.5);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid var(--glass-border);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  border-color: var(--blue);
  background: rgba(96, 165, 250, 0.1);
}

/* ========== HEADER ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all 0.3s ease;
  background: #ffffff;
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
}

.header.scrolled {
  background: #ffffff;
  backdrop-filter: none;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
  padding: 10px 0;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.logo-img {
  height: 56px;
  width: auto;
}

.logo-service-name {
  font-size: 1rem;
  font-weight: 700;
  color: #333;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: #555;
  transition: color 0.3s ease;
  white-space: nowrap;
}

.nav-link:hover {
  color: #111;
}

.nav-link--cta {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: #333;
  transition: all 0.3s ease;
  border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* ========== HERO ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
  animation: heroKenBurns 10s ease-in-out infinite alternate;
}

@keyframes heroKenBurns {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(1.06);
  }
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg,
    rgba(10, 14, 39, 0.6) 0%,
    rgba(10, 14, 39, 0.4) 40%,
    rgba(10, 14, 39, 0.85) 80%,
    rgba(10, 14, 39, 1) 100%
  );
}

.hero-gradient-anim {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.25;
  background:
    radial-gradient(ellipse 600px 600px at 20% 30%, rgba(96, 165, 250, 0.6), transparent),
    radial-gradient(ellipse 500px 500px at 80% 60%, rgba(167, 139, 250, 0.5), transparent),
    radial-gradient(ellipse 400px 400px at 50% 80%, rgba(56, 189, 248, 0.4), transparent);
  background-size: 100% 100%;
  animation: heroGradientMove 12s ease-in-out infinite alternate;
}

@keyframes heroGradientMove {
  0% {
    transform: scale(1) translate(0, 0);
    filter: blur(60px);
  }
  33% {
    transform: scale(1.1) translate(5%, -3%);
    filter: blur(70px);
  }
  66% {
    transform: scale(0.95) translate(-3%, 5%);
    filter: blur(55px);
  }
  100% {
    transform: scale(1.05) translate(3%, 2%);
    filter: blur(65px);
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 120px 24px 80px;
  max-width: 900px;
}

.hero-label {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 400;
  font-style: italic;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 16px;
}

.hero-service-name {
  font-size: clamp(1.25rem, 3.5vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--white);
  margin-bottom: 32px;
  border-bottom: 2px solid rgba(96, 165, 250, 0.4);
  display: inline-block;
  padding-bottom: 12px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 24px;
  color: var(--white);
}

.hero-subtitle {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--text-muted);
  margin-bottom: 48px;
  line-height: 2;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-actions .btn {
  font-size: 1.125rem;
}

.hero-actions .btn-primary {
  background: #c0392b;
  color: var(--white);
  box-shadow: 0 4px 20px rgba(192, 57, 43, 0.3);
}

.hero-actions .btn-primary:hover {
  background: #a93226;
  box-shadow: 0 8px 28px rgba(192, 57, 43, 0.45);
}

.hero-actions .btn-outline {
  border-color: rgba(255, 255, 255, 0.4);
  color: var(--white);
}

.hero-actions .btn-outline:hover {
  border-color: var(--white);
  background: rgba(255, 255, 255, 0.08);
}

.hero-video {
  max-width: 640px;
  margin: 0 auto;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.hero-video video {
  width: 100%;
  display: block;
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 1;
}

.hero-scroll span {
  font-family: var(--font-en);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--text-muted);
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: var(--gradient);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ========== SECTIONS ========== */
.section {
  padding: 160px 0;
  border-top: 1px solid var(--border);
}

.section-label {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  font-style: italic;
  text-transform: uppercase;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
  text-align: center;
}

.section-title {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 28px;
  color: var(--white);
}

.section-desc {
  text-align: center;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto 88px;
  font-size: 1.125rem;
  line-height: 2;
}

/* ========== SERVICE ========== */
.section--service {
  background: var(--gradient-bg);
}

.service-image {
  margin-bottom: 60px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--glass-border);
}

.features-list {
  max-width: 700px;
  margin: 0 auto 60px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
}

.feature-item:first-child {
  border-top: 1px solid var(--border);
}

.feature-item-number {
  font-family: var(--font-en);
  font-size: 0.975rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  flex-shrink: 0;
  padding-top: 2px;
}

.feature-item-body {
  flex: 1;
}

.feature-item-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}

.feature-item-text {
  font-size: 1.025rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.service-video {
  max-width: 800px;
  margin: 0 auto;
}

.video-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--blue);
  margin-bottom: 12px;
  text-align: center;
}

.service-video video {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
}

/* ========== PROBLEMS ========== */
.section--problems {
  background: var(--navy);
}

.problems-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 60px;
}

.problem-card {
  background: var(--navy-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.problem-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient);
}

.problem-number {
  font-family: var(--font-en);
  font-size: 3.5rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
  line-height: 1;
  opacity: 0.7;
}

.problem-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 24px;
}

.problem-compare {
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
}

.problem-before {
  flex: 1;
}

.compare-label {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 8px;
}

.compare-label--before {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
}

.compare-label--after {
  background: rgba(52, 211, 153, 0.15);
  color: #34d399;
}

.problem-before {
  min-height: 120px;
}

.problem-before ul,
.problem-after ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.problem-before li,
.problem-after li {
  font-size: 0.975rem;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
}

.problem-before li::before {
  content: '×';
  position: absolute;
  left: 0;
  color: #f87171;
  font-weight: 700;
}

.problem-after li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #34d399;
  font-weight: 700;
}


/* ========== REASONS ========== */
.section--reasons {
  background: var(--gradient-bg);
}

.reasons-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-bottom: 60px;
}

.reason-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 40px 32px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.reason-card:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-4px) scale(1.02);
}

.reason-number {
  font-family: var(--font-en);
  font-size: 3.5rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.7;
}

.reason-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
  line-height: 1.5;
}

.reason-sub {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
}

.reason-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}


/* ========== USE CASES ========== */
.section--usecases {
  background: var(--navy);
}

.usecases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.usecase-card {
  background: var(--navy-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.usecase-card--link {
  display: block;
  cursor: pointer;
}

.usecase-card--link:hover {
  border-color: var(--blue);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(96, 165, 250, 0.15);
}

.usecase-card--image {
  padding: 0;
  position: relative;
  overflow: hidden;
}

a.usecase-card--image {
  display: block;
  cursor: pointer;
}

a.usecase-card--image:hover {
  border-color: var(--blue);
  transform: translateY(-4px) scale(1.03);
  box-shadow: 0 12px 40px rgba(96, 165, 250, 0.15);
}

.usecase-card--image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 280px;
  transition: transform 0.4s ease;
}

a.usecase-card--image:hover img {
  transform: scale(1.05);
}

.usecase-card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 60px 24px 24px;
  background: linear-gradient(transparent, rgba(10, 14, 39, 0.95));
}

.usecase-card-overlay .usecase-title,
.usecase-card-overlay .usecase-text {
  color: var(--white);
}

.usecase-card-overlay .usecase-link-text {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue);
  transition: color 0.3s ease;
}

a.usecase-card--image:hover .usecase-link-text {
  color: var(--purple);
}

.usecase-icon {
  width: 48px;
  height: 48px;
  color: var(--blue);
  margin-bottom: 20px;
}

.usecase-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}

.usecase-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.usecase-link-text {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue);
  transition: color 0.3s ease;
}

.usecase-card--link:hover .usecase-link-text,
.usecase-card--thumb:hover .usecase-link-text {
  color: var(--purple);
}

/* Thumbnail use case cards */
.usecase-card--thumb {
  padding: 0;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  overflow: hidden;
}

.usecase-card--thumb:hover {
  border-color: var(--blue);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(96, 165, 250, 0.15);
}

.usecase-thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.usecase-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.usecase-card--thumb:hover .usecase-thumb img {
  transform: scale(1.05);
}

.usecase-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  opacity: 0.85;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.usecase-card--thumb:hover .usecase-play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1.1);
}

.usecase-thumb-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 8px 16px;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--white);
}

.usecase-thumb-body {
  padding: 20px 24px 24px;
}

.usecase-thumb-body .usecase-title {
  margin-bottom: 8px;
}

.usecase-thumb-body .usecase-text {
  margin-bottom: 12px;
}

/* ========== CASE STUDIES ========== */
.section--cases {
  background: var(--gradient-bg);
}

.cases-list {
  max-width: 700px;
  margin: 0 auto 40px;
  display: flex;
  flex-direction: column;
}

.case-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.case-item:first-child {
  border-top: 1px solid var(--border);
}

.case-item-category {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
}

.case-item-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}


.cases-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ========== FLOW ========== */
.section--flow {
  background: var(--gradient-bg);
}

.flow-timeline {
  max-width: 700px;
  margin: 60px auto 0;
  position: relative;
  padding-left: 40px;
}

/* Vertical line */
.flow-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 27px;
  width: 2px;
  background: linear-gradient(180deg, var(--blue), var(--purple));
  opacity: 0.25;
}

.flow-step {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 0 0 48px;
}

.flow-step:last-child {
  padding-bottom: 0;
}

.flow-step-marker {
  position: relative;
  flex-shrink: 0;
}

.flow-step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en);
  font-size: 1rem;
  font-weight: 800;
  color: var(--white);
  position: relative;
  z-index: 1;
  box-shadow: 0 0 20px rgba(96, 165, 250, 0.3);
}

.flow-step-content {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 24px 28px;
  backdrop-filter: blur(10px);
  flex: 1;
  transition: all 0.3s ease;
}

.flow-step-content:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(96, 165, 250, 0.3);
  box-shadow: 0 8px 32px rgba(96, 165, 250, 0.1);
}

.flow-step-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 6px;
}

.flow-step-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ========== PRICING ========== */
.section--pricing {
  background: var(--gradient-bg);
}

.pricing-box {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 60px 40px;
  backdrop-filter: blur(10px);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  margin-bottom: 20px;
}

.pricing-from {
  font-family: var(--font-en);
  font-size: 1rem;
  color: var(--text-muted);
}

.pricing-amount {
  font-family: var(--font-en);
  font-size: 4rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.pricing-unit {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
}

.pricing-note {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.8;
}

/* ========== FAQ ========== */
.section--faq {
  background: var(--navy);
}

.faq-list {
  max-width: 800px;
  margin: 60px auto 0;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--white);
  font-family: var(--font-jp);
  font-size: 1rem;
  font-weight: 700;
  text-align: left;
  padding: 24px 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: color 0.3s ease;
}

.faq-question:hover {
  color: var(--blue);
}

.faq-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 24px;
}

.faq-answer p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ========== CONTACT ========== */
.section--contact {
  background: var(--gradient-bg);
}

.contact-cta {
  text-align: center;
  margin-top: 40px;
}

.contact-cta + .contact-cta {
  margin-top: 20px;
}

.btn-cta-large {
  display: inline-block;
  font-size: 1.375rem;
  padding: 24px 64px;
  border-radius: var(--radius);
  letter-spacing: 0.05em;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  width: 100%;
  max-width: 480px;
  background: #c0392b;
  color: var(--white);
  box-shadow: 0 4px 24px rgba(192, 57, 43, 0.3);
}

.btn-cta-large:hover {
  transform: translateY(-3px);
  background: #a93226;
  box-shadow: 0 8px 32px rgba(192, 57, 43, 0.45);
}

/* ========== FOOTER ========== */
.footer {
  background: #ffffff;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  padding: 60px 0 40px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.footer-logo {
  text-align: center;
}

.footer-logo img {
  height: 56px;
  margin: 0 auto 12px;
}

.footer-tagline {
  font-size: 1rem;
  color: #666;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 1.05rem;
  color: #555;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: #111;
}

.footer-copy {
  font-family: var(--font-en);
  font-size: 0.75rem;
  color: #999;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  .pc-only {
    display: none;
  }

  .logo-service-name {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 14, 39, 0.98);
    backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 1000;
  }

  .nav.active {
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    gap: 28px;
  }

  .nav-link {
    font-size: 1.125rem;
  }

  .section {
    padding: 100px 0;
  }

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

  .case-item {
    flex-direction: column;
    gap: 4px;
  }

  .flow-timeline {
    padding-left: 28px;
  }

  .flow-timeline::before {
    left: 18px;
  }

  .flow-step-number {
    width: 40px;
    height: 40px;
    font-size: 0.85rem;
  }

  .flow-step {
    gap: 16px;
  }

  .reasons-grid,
  .usecases-grid {
    grid-template-columns: 1fr;
  }

  .hero-content {
    padding: 100px 20px 60px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 320px;
  }

  .pricing-amount {
    font-size: 3rem;
  }

  .pricing-box {
    padding: 40px 24px;
  }

  .footer-links {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .problem-card,
  .reason-card,
  .feature-card {
    padding: 28px 20px;
  }
}