/* ============================================
   Smartbit デザインシステム
   ============================================ */

/* カスタムプロパティ（CSS変数） */
:root {
  /* カラーパレット - ダークグレー基調 */
  --color-primary: #3B82F6;
  --color-primary-dark: #2563EB;
  --color-primary-light: #60A5FA;
  --color-secondary: #475569;
  --color-accent: #22D3EE;
  
  /* グラデーション - 落ち着いたダークグレー */
  --gradient-primary: linear-gradient(135deg, #1E293B 0%, #334155 100%);
  --gradient-hero: linear-gradient(135deg, #0F172A 0%, #1E293B 50%, #334155 100%);
  --gradient-card: linear-gradient(180deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
  
  /* テキストカラー */
  --color-text-primary: #1E293B;
  --color-text-secondary: #64748B;
  --color-text-light: #F8FAFC;
  --color-text-muted: #94A3B8;
  
  /* 背景カラー */
  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #F1F5F9;
  --color-bg-dark: #0F172A;
  --color-bg-card: #FFFFFF;
  
  /* ボーダー */
  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;
  
  /* シャドウ */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.2);
  
  /* スペーシング */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* フォント */
  --font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 4rem;
  
  /* ボーダー半径 */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* トランジション */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal: 400;
  --z-tooltip: 500;
}

/* リセット & ベース */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ============================================
   ユーティリティ
   ============================================ */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-md);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--spacing-2xl);
}

/* ============================================
   ヘッダー & ナビゲーション
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
  background: rgba(79, 70, 229, 0.1);
}

.nav-link.active {
  color: var(--color-primary);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-xs);
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: var(--transition-fast);
}

/* ============================================
   ボタン
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition-normal);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-secondary {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
}

.btn-secondary:hover {
  background: var(--color-border);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: white;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: var(--font-size-base);
}

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

.btn-white:hover {
  background: var(--color-bg-secondary);
}

/* ============================================
   ヒーローセクション
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  padding-top: 72px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--color-text-light);
}

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
  backdrop-filter: blur(4px);
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

.hero-title-gradient {
  background: linear-gradient(135deg, #60A5FA 0%, #A78BFA 50%, #F472B6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.8);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.hero-visual {
  position: absolute;
  right: -100px;
  top: 50%;
  transform: translateY(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.3) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(60px);
}

/* ============================================
   サービスカード
   ============================================ */

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.service-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  border: 1px solid var(--color-border);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: var(--transition-normal);
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary-light);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-2xl);
}

.service-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.service-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  transition: var(--transition-fast);
}

.service-link:hover {
  gap: var(--spacing-sm);
}

/* ============================================
   プライシングカード
   ============================================ */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  max-width: 1000px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  border: 1px solid var(--color-border);
  text-align: center;
  transition: var(--transition-normal);
  position: relative;
}

.pricing-card.featured {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
  transform: scale(1.05);
}

.pricing-card.featured::before {
  content: 'おすすめ';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-primary);
  color: white;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

.pricing-plan {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.pricing-price {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.pricing-price span {
  font-size: var(--font-size-base);
  font-weight: 400;
  color: var(--color-text-secondary);
}

.pricing-features {
  text-align: left;
  margin-bottom: var(--spacing-lg);
}

.pricing-feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.pricing-feature::before {
  content: '✓';
  color: var(--color-accent);
  font-weight: 700;
}

/* ============================================
   フッター
   ============================================ */

.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.footer-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.8;
}

.footer-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transition: var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ============================================
   フォーム
   ============================================ */

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
}

.form-label .required {
  color: #EF4444;
  margin-left: 4px;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: var(--font-size-base);
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-primary);
  transition: var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1rem;
  padding-right: 2.5rem;
  cursor: pointer;
}

.form-select:hover {
  border-color: var(--color-primary-light);
}

.form-select option {
  padding: 0.75rem;
  background: var(--color-bg-primary);
}

.form-textarea {
  resize: vertical;
  min-height: 150px;
}

/* ============================================
   特徴セクション
   ============================================ */

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.feature-item {
  text-align: center;
  padding: var(--spacing-lg);
}

.feature-icon {
  width: 80px;
  height: 80px;
  background: rgba(79, 70, 229, 0.1);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
  font-size: var(--font-size-3xl);
}

.feature-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.feature-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ============================================
   CTAセクション
   ============================================ */

.cta {
  background: var(--gradient-primary);
  padding: var(--spacing-3xl) 0;
  text-align: center;
  color: white;
}

.cta-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.cta-description {
  font-size: var(--font-size-lg);
  opacity: 0.9;
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   会社概要ページ
   ============================================ */

.about-hero {
  padding: calc(72px + var(--spacing-3xl)) 0 var(--spacing-3xl);
  background: var(--gradient-hero);
  color: white;
  text-align: center;
}

.about-hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
}

.about-hero-description {
  font-size: var(--font-size-lg);
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

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

.info-table tr {
  border-bottom: 1px solid var(--color-border);
}

.info-table th,
.info-table td {
  padding: var(--spacing-md);
  text-align: left;
}

.info-table th {
  width: 200px;
  font-weight: 600;
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
}

.info-table td {
  color: var(--color-text-secondary);
}

/* ============================================
   アニメーション
   ============================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }
.animate-delay-5 { animation-delay: 0.5s; }

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

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-card.featured {
    transform: none;
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
  }
  
  .nav-list {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
  }
  
  .nav-list.active {
    display: flex;
  }
  
  .hamburger {
    display: flex;
  }
  
  .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);
  }
  
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-brand {
    max-width: none;
  }
  
  .footer-links {
    align-items: center;
  }
  
  .info-table th,
  .info-table td {
    display: block;
    width: 100%;
  }
  
  .info-table th {
    border-bottom: none;
  }

  .timeline {
    padding-left: var(--spacing-md);
  }

  .timeline-item::before {
    left: 0;
  }

  .timeline-content {
    padding-left: var(--spacing-xl);
  }
}

/* ============================================
   タイムライン
   ============================================ */

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

.timeline-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-lg);
  position: relative;
  padding-bottom: var(--spacing-xl);
}

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

/* 縦線 */
.timeline-item:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 80px;
  top: 24px;
  bottom: -12px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-border) 100%);
}

.timeline-marker {
  flex-shrink: 0;
  width: 160px;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.timeline-marker::before {
  content: '';
  width: 12px;
  height: 12px;
  background: var(--color-primary);
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
  transition: var(--transition-normal);
}

.timeline-marker.future::before {
  background: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.2);
  animation: pulse-simple 2s infinite;
}

@keyframes pulse-simple {
  0%, 100% {
    box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.2);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(34, 211, 238, 0.1);
  }
}

.timeline-item:hover .timeline-marker::before {
  transform: scale(1.3);
}

.timeline-content {
  flex: 1;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  border: 1px solid var(--color-border);
  transition: var(--transition-normal);
}

.timeline-item:hover .timeline-content {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.timeline-date {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

.timeline-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 4px;
}

.timeline-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

@media (max-width: 768px) {
  .timeline-item {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .timeline-marker {
    width: auto;
  }

  .timeline-item:not(:last-child)::after {
    display: none;
  }
}