/* ============================================
   酒丸シリーズ ホームページ - スタイルシート
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* カラーパレット */
  --color-navy: #1e293b;
  --color-navy-dark: #0f172a;
  --color-crimson: #c53d43;
  --color-crimson-dark: #a33038;
  --color-gold: #c69c3f;
  --color-amber: #d97706;
  --color-washi: #f7f4ed;
  --color-card-bg: #fefcf6;
  --color-text-dark: #1a1a1a;
  --color-text-light: #6b7280;
  --color-white: #ffffff;
  --color-border: #e5e1d8;

  /* システムカラー */
  --color-kanjoshu: #c53d43;
  --color-kura: #2563eb;
  --color-noren: #059669;
  --color-hikyaku: #d97706;
  --color-senrigan: #7c3aed;
  --color-soroban: #0891b2;
  --color-choba: #dc2626;

  /* フォント */
  --font-heading: 'Shippori Mincho', serif;
  --font-body: 'Noto Sans JP', sans-serif;

  /* スペーシング */
  --section-padding: 100px;
  --container-max: 1200px;

  /* その他 */
  --header-height: 72px;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-dark);
  background-color: var(--color-washi);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.4;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section-title {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 16px;
  color: var(--color-navy);
}

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

.section-subtitle {
  text-align: center;
  color: var(--color-text-light);
  font-size: 1.1rem;
  margin-bottom: 48px;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 14px 36px;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  text-align: center;
}

.btn-primary {
  background: var(--color-crimson);
  color: var(--color-white);
  border-color: var(--color-crimson);
}

.btn-primary:hover {
  background: var(--color-crimson-dark);
  border-color: var(--color-crimson-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(197, 61, 67, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

.btn-outline:hover {
  background: var(--color-white);
  color: var(--color-navy);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 44px;
  font-size: 1.1rem;
}

/* ============================================
   ヘッダー
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(30, 41, 59, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--transition);
}

.site-header.scrolled {
  background: rgba(30, 41, 59, 0.98);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.logo-main {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-gold);
}

.logo-sub {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.8);
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 32px;
}

.main-nav a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9rem;
  font-weight: 400;
  transition: color var(--transition);
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-gold);
  transition: width var(--transition);
}

.main-nav a:hover {
  color: var(--color-white);
}

.main-nav a:hover::after {
  width: 100%;
}

.nav-cta {
  background: var(--color-crimson) !important;
  color: var(--color-white) !important;
  padding: 8px 20px !important;
  border-radius: 6px !important;
}

.nav-cta::after {
  display: none !important;
}

.nav-cta:hover {
  background: var(--color-crimson-dark) !important;
}

/* ハンバーガー */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   ヒーローセクション
   ============================================ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(198, 156, 63, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(197, 61, 67, 0.1) 0%, transparent 50%),
    linear-gradient(160deg, #0f172a 0%, #1e293b 40%, #1e3a4a 70%, #0f172a 100%);
}

.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: rgba(15, 23, 42, 0.55);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 24px;
}

.hero-main-copy {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
  letter-spacing: 0.08em;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1s 0.3s forwards;
}

.hero-sub-copy {
  font-family: var(--font-heading);
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  color: var(--color-gold);
  margin-bottom: 24px;
  font-weight: 500;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1s 0.6s forwards;
}

.hero-lead {
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 40px;
  line-height: 1.9;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1s 0.9s forwards;
}

.hero-cta {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1s 1.2s forwards;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  opacity: 0;
  animation: fadeIn 1s 2s forwards;
}

.hero-scroll-indicator span {
  display: block;
  width: 24px;
  height: 40px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-radius: 12px;
  position: relative;
}

.hero-scroll-indicator span::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: rgba(255, 255, 255, 0.6);
  border-radius: 2px;
  animation: scrollBounce 2s infinite;
}

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

@keyframes fadeIn {
  to { opacity: 1; }
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
  50% { transform: translateX(-50%) translateY(12px); opacity: 0.3; }
}

/* ============================================
   セクション2: 酒丸シリーズとは
   ============================================ */
.about {
  background: var(--color-white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 64px;
}

.about-text h2 {
  text-align: left;
  margin-bottom: 24px;
}

.about-text p {
  margin-bottom: 16px;
  color: var(--color-text-dark);
  line-height: 2;
}

.about-image img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.stat-card {
  text-align: center;
  padding: 32px 16px;
  background: var(--color-card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.stat-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--color-crimson);
  line-height: 1.2;
}

.stat-label {
  display: block;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-navy);
  margin-top: 8px;
}

.stat-desc {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: 4px;
}

/* ============================================
   セクション3: アーキテクチャ図
   ============================================ */
.architecture {
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  padding: var(--section-padding) 0;
  overflow: hidden;
}

.architecture .section-title {
  color: var(--color-white);
  margin-bottom: 48px;
}

.architecture-diagram {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.arch-layer {
  display: flex;
  justify-content: center;
  gap: 24px;
  width: 100%;
}

.arch-layer-core {
  width: 100%;
}

.arch-node {
  position: relative;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(198, 156, 63, 0.25);
  border-radius: 12px;
  padding: 20px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  min-width: 140px;
}

.arch-node:hover {
  background: rgba(198, 156, 63, 0.12);
  border-color: var(--color-gold);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(198, 156, 63, 0.2);
}

.arch-node-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 8px;
  color: var(--color-gold);
}

.arch-node-name {
  display: block;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-white);
}

.arch-node-sub {
  display: block;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 2px;
}

.arch-node-core {
  background: rgba(197, 61, 67, 0.12);
  border-color: rgba(197, 61, 67, 0.4);
  padding: 24px 48px;
  min-width: 100%;
}

.arch-node-core:hover {
  background: rgba(197, 61, 67, 0.2);
  border-color: var(--color-crimson);
  box-shadow: 0 8px 32px rgba(197, 61, 67, 0.2);
}

.arch-node-core .arch-node-icon {
  color: var(--color-crimson);
}

.arch-node-core .arch-node-name {
  font-size: 1.2rem;
}

.arch-node-detail {
  display: block;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
  margin-top: 4px;
}

.arch-node-wide {
  min-width: 100%;
}

/* 接続線 */
.arch-connector {
  display: flex;
  justify-content: center;
  padding: 12px 0;
}

.arch-connector-vertical::before {
  content: '';
  display: block;
  width: 2px;
  height: 24px;
  background: linear-gradient(180deg, rgba(198, 156, 63, 0.5), rgba(198, 156, 63, 0.15));
}

.arch-connector-triple {
  display: flex;
  justify-content: space-around;
  width: 80%;
  padding: 12px 0;
}

.arch-connector-line {
  width: 2px;
  height: 24px;
  background: linear-gradient(180deg, rgba(198, 156, 63, 0.5), rgba(198, 156, 63, 0.15));
}

/* ツールチップ */
.arch-tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-navy-dark);
  color: var(--color-white);
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 0.8rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  z-index: 10;
  border: 1px solid rgba(198, 156, 63, 0.3);
}

.arch-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--color-navy-dark);
}

.arch-node:hover .arch-tooltip {
  opacity: 1;
}

/* ============================================
   セクション4: システム詳細カード
   ============================================ */
.system-details {
  background: var(--color-washi);
}

.system-details .section-title {
  margin-bottom: 48px;
}

.system-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 80px;
  padding: 40px;
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.system-card:last-child {
  margin-bottom: 0;
}

.system-card-reverse {
  direction: rtl;
}

.system-card-reverse > * {
  direction: ltr;
}

.system-card-image img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition);
}

.system-card:hover .system-card-image img {
  transform: scale(1.02);
}

.system-card-image-group {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.system-card-image-group img:first-child {
  flex: 1;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.system-card-image-mobile {
  width: 30%;
  border-radius: var(--radius) !important;
  box-shadow: var(--shadow) !important;
}

.system-card-image-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-placeholder {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, #f0f0f0, #e0e0e0);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--color-text-light);
}

.image-placeholder svg {
  width: 80px;
  height: 80px;
}

.image-placeholder span {
  font-family: var(--font-heading);
  font-size: 1.2rem;
}

.system-card-header {
  margin-bottom: 16px;
}

.system-name {
  font-size: 1.5rem;
  color: var(--color-navy);
  margin-bottom: 4px;
}

.system-reading {
  font-size: 0.85rem;
  color: var(--color-text-light);
  font-weight: 400;
  margin-left: 8px;
}

.system-subtitle {
  display: block;
  font-size: 0.9rem;
  color: var(--color-crimson);
  font-weight: 500;
}

.system-desc {
  margin-bottom: 16px;
  line-height: 1.9;
}

.system-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 16px;
  margin-bottom: 16px;
}

.system-features li {
  font-size: 0.9rem;
  color: var(--color-text-dark);
  padding-left: 16px;
  position: relative;
}

.system-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--color-gold);
  border-radius: 50%;
}

.system-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.system-highlights span {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(30, 41, 59, 0.06);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--color-navy);
}

/* ============================================
   セクション5: 導入メリット
   ============================================ */
.benefits {
  background: var(--color-white);
}

.benefits .section-title {
  margin-bottom: 48px;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.benefit-card {
  padding: 32px 24px;
  background: var(--color-card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.benefit-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.benefit-icon {
  width: 48px;
  height: 48px;
  color: var(--color-crimson);
  margin-bottom: 16px;
}

.benefit-card h3 {
  font-size: 1.15rem;
  color: var(--color-navy);
  margin-bottom: 12px;
}

.benefit-card > p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
  line-height: 1.7;
}

.benefit-card ul {
  padding-left: 0;
}

.benefit-card li {
  font-size: 0.85rem;
  color: var(--color-text-dark);
  padding-left: 16px;
  position: relative;
  margin-bottom: 4px;
}

.benefit-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  background: var(--color-gold);
  border-radius: 50%;
}

/* ============================================
   セクション6: 導入フロー
   ============================================ */
.flow {
  background: var(--color-washi);
}

.flow .section-title {
  margin-bottom: 8px;
}

.timeline {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 32px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold), var(--color-crimson));
}

.timeline-item {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  position: relative;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  flex-shrink: 0;
  width: 64px;
  display: flex;
  justify-content: center;
}

.timeline-step {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-navy);
  color: var(--color-gold);
  border-radius: 50%;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  position: relative;
  z-index: 1;
  border: 3px solid var(--color-washi);
}

.timeline-content {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  flex: 1;
}

.timeline-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.timeline-header h3 {
  font-size: 1.1rem;
  color: var(--color-navy);
}

.timeline-duration {
  display: inline-block;
  padding: 3px 12px;
  background: rgba(198, 156, 63, 0.12);
  color: var(--color-amber);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

.timeline-content p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ============================================
   セクション7: FAQ
   ============================================ */
.faq {
  background: var(--color-white);
}

.faq .section-title {
  margin-bottom: 48px;
}

.faq-category {
  margin-bottom: 32px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.faq-category:last-child {
  margin-bottom: 0;
}

.faq-category-title {
  font-size: 1.1rem;
  color: var(--color-crimson);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(197, 61, 67, 0.15);
}

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

.faq-item:last-child {
  border-bottom: none;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-dark);
  transition: color var(--transition);
}

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

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-text-light);
  transition: transform var(--transition);
}

.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(180deg);
}

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

.faq-answer.open {
  max-height: 300px;
}

.faq-answer p {
  padding: 0 0 18px;
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ============================================
   セクション8: お問い合わせ
   ============================================ */
.contact {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  text-align: center;
}

.contact-inner {
  max-width: 600px;
  margin: 0 auto;
}

.contact .section-title {
  margin-bottom: 16px;
}

.contact-text {
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 32px;
  line-height: 1.9;
}

.contact-cta-group {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 40px;
}

.contact-email {
  margin-top: 24px;
}

.contact-email img {
  max-width: 280px;
  margin: 0 auto 12px;
}

.contact-email-note {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.45);
}

/* ============================================
   フッター
   ============================================ */
.site-footer {
  background: var(--color-navy-dark);
  color: rgba(255, 255, 255, 0.6);
  padding: 48px 0 24px;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 32px;
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-gold);
}

.footer-company {
  font-size: 0.85rem;
  margin-top: 4px;
}

.footer-nav ul {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 0.85rem;
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: var(--color-white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 0.8rem;
}

/* ============================================
   スクロールアニメーション
   ============================================ */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   レスポンシブ
   ============================================ */

/* タブレット */
@media (max-width: 1023px) {
  :root {
    --section-padding: 72px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-text h2 {
    text-align: center;
  }

  .system-card {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 28px;
  }

  .system-card-reverse {
    direction: ltr;
  }

  .system-card-image {
    order: -1;
  }

  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .arch-layer-operations {
    flex-wrap: wrap;
  }
}

/* モバイル */
@media (max-width: 767px) {
  :root {
    --section-padding: 56px;
    --header-height: 60px;
  }

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

  /* ハンバーガーメニュー */
  .hamburger {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 48px;
    transform: translateX(100%);
    transition: transform 0.4s ease;
  }

  .main-nav.open {
    transform: translateX(0);
  }

  .main-nav ul {
    flex-direction: column;
    align-items: center;
    gap: 24px;
  }

  .main-nav a {
    font-size: 1.1rem;
  }

  .nav-cta {
    padding: 12px 28px !important;
  }

  /* ヒーロー */
  .hero {
    min-height: 500px;
  }

  .hero-lead br {
    display: none;
  }

  /* 統計 */
  .stats-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .stat-number {
    font-size: 2.5rem;
  }

  /* アーキテクチャ図 */
  .arch-layer {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

  .arch-layer-top,
  .arch-layer-operations {
    flex-direction: column;
    align-items: center;
  }

  .arch-node {
    min-width: 200px;
    width: 100%;
    max-width: 280px;
  }

  .arch-node-core {
    min-width: unset;
    max-width: 100%;
  }

  .arch-connector-triple {
    flex-direction: column;
    align-items: center;
    width: auto;
    gap: 0;
  }

  .arch-connector-triple .arch-connector-line:not(:first-child) {
    display: none;
  }

  .arch-tooltip {
    display: none;
  }

  /* システムカード */
  .system-card {
    padding: 20px;
    margin-bottom: 32px;
    gap: 16px;
  }

  .system-features {
    grid-template-columns: 1fr;
  }

  .system-card-image-group {
    flex-direction: column;
    align-items: center;
  }

  .system-card-image-mobile {
    width: 60%;
  }

  /* メリット */
  .benefits-grid {
    grid-template-columns: 1fr;
  }

  /* タイムライン */
  .timeline::before {
    left: 24px;
  }

  .timeline-marker {
    width: 48px;
  }

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

  .timeline-content {
    padding: 18px;
  }

  .timeline-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  /* お問い合わせ */
  .contact-cta-group {
    flex-direction: column;
    align-items: center;
  }

  .contact-text br {
    display: none;
  }

  /* フッター */
  .footer-grid {
    flex-direction: column;
    gap: 24px;
    align-items: center;
    text-align: center;
  }

  .footer-nav ul {
    justify-content: center;
  }
}

/* prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .animate-on-scroll {
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }
}