/* デザインシステム & 変数定義 */
:root {
  --font-primary: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --bg-primary: #f8fafc;
  --bg-card: rgba(255, 255, 255, 0.75);
  --border-color: rgba(226, 232, 240, 0.8);
  --text-main: #0f172a;
  --text-muted: #475569;
  
  /* グラデーションパレット */
  --grad-primary: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --grad-hover: linear-gradient(135deg, #4f46e5 0%, #9333ea 50%, #db2777 100%);
  --grad-glow-1: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(255, 255, 255, 0) 70%);
  --grad-glow-2: radial-gradient(circle, rgba(236, 72, 153, 0.12) 0%, rgba(255, 255, 255, 0) 70%);
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 40px -15px rgba(99, 102, 241, 0.1);
  
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
  
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 基本スタイル */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
  position: relative;
  line-height: 1.6;
}

/* 背景の光るオーブ */
.glow-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: -1;
  pointer-events: none;
}

.glow-sphere {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation: float 12s ease-in-out infinite alternate;
}

.glow-sphere-1 {
  top: -10%;
  right: -5%;
  width: 600px;
  height: 600px;
  background: var(--grad-glow-1);
}

.glow-sphere-2 {
  bottom: -10%;
  left: -5%;
  width: 500px;
  height: 500px;
  background: var(--grad-glow-2);
  animation-delay: -6s;
}

@keyframes float {
  0% { transform: translateY(0px) scale(1); }
  100% { transform: translateY(40px) scale(1.1); }
}

/* メインコンテナ */
.app-container {
  width: 100%;
  max-width: 1100px;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  gap: 60px;
  z-index: 1;
}

/* ヘッダー */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  font-size: 28px;
  animation: pulse 2s infinite ease-in-out;
}

.logo-text {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.badge {
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  color: var(--text-muted);
  box-shadow: var(--shadow-sm);
}

/* ヒーローセクション */
.hero-section {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
  color: var(--text-main);
}

.gradient-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* カードグリッド */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-md);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--grad-primary);
  opacity: 0;
  transition: var(--transition-smooth);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(99, 102, 241, 0.2);
}

.feature-card:hover::before {
  opacity: 1;
}

.card-icon {
  font-size: 40px;
  width: 70px;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
}

.feature-card:hover .card-icon {
  transform: scale(1.1) rotate(5deg);
}

.card-title {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.5px;
}

.card-description {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
}

.card-btn {
  margin-top: auto;
  align-self: flex-start;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border: none;
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  background: var(--text-main);
  color: #ffffff;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-sm);
}

.card-btn:hover {
  background: var(--grad-primary);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -10px rgba(99, 102, 241, 0.5);
}

/* フッター */
.app-footer {
  text-align: center;
  border-top: 1px solid var(--border-color);
  padding-top: 32px;
  color: var(--text-muted);
  font-size: 14px;
}

/* アニメーション */
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .hero-title {
    font-size: 40px;
  }
  
  .app-container {
    gap: 40px;
  }
  
  .feature-card {
    padding: 32px 24px;
  }
}

/* カスタムモーダル */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.3);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.modal-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  width: 90%;
  max-width: 500px;
  box-shadow: 0 30px 60px -15px rgba(15, 23, 42, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 20px;
  transform: scale(0.9) translateY(20px);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-card {
  transform: scale(1) translateY(0);
}

.modal-icon {
  font-size: 48px;
  width: 80px;
  height: 80px;
  background: var(--bg-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.modal-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.modal-text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
}

.modal-close-btn {
  width: 100%;
  padding: 14px;
  border-radius: var(--radius-sm);
  border: none;
  font-family: var(--font-primary);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  background: var(--text-main);
  color: #ffffff;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-sm);
}

.modal-close-btn:hover {
  background: var(--grad-primary);
  box-shadow: 0 10px 20px -10px rgba(99, 102, 241, 0.5);
}