/* ========================================
   リセット & ベーススタイル
   ======================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* カラーパレット - 落ち着いた類似色アプローチ */
  --color-primary: #D4A5A5;
  --color-primary-dark: #C08B8B;
  --color-primary-light: #E8C4C4;
  --color-secondary: #F5EDE8;
  --color-text-primary: #3E3E3E;
  --color-text-secondary: #6B6B6B;
  --color-text-light: #FFFFFF;
  --color-bg-white: #FAF7F5;
  --color-bg-light: #F0EBE8;
  --color-bg-accent: #E8DDD7;
  --color-border: #E5E5E5;
  
  /* スペーシング */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 40px;
  --spacing-xl: 64px;
  --spacing-xxl: 96px;
  
  /* タイポグラフィ */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Noto Sans JP', Meiryo, sans-serif;
  
  /* トランジション */
  --transition-base: all 0.3s ease;
  
  /* 影 */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.16);
  
  /* ボーダー半径 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

html {
  scroll-behavior: smooth;
}

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

body.menu-open {
  overflow: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}


/* ========================================
   コンテナ
   ======================================== */

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

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
}


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

.btn {
  display: inline-block;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  text-align: center;
  border-radius: var(--radius-full);
  transition: var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

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

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

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

.btn-small {
  padding: 10px 24px;
  font-size: 14px;
}

.btn-large {
  padding: 18px 40px;
  font-size: 18px;
}

@media (max-width: 768px) {
  .btn {
    padding: 12px 24px;
    font-size: 14px;
  }
  
  .btn-large {
    padding: 14px 28px;
    font-size: 16px;
  }
}


/* ========================================
   セクション共通
   ======================================== */

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

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.section-header.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.section-title {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
  line-height: 1.3;
}

.section-description {
  font-size: 18px;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  .section-header {
    margin-bottom: var(--spacing-lg);
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .section-description {
    font-size: 16px;
  }
}


/* ========================================
   ヘッダー
   ======================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--color-bg-white);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: var(--transition-base);
}

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

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
}

.logo-icon {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

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

.nav-link {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text-primary);
}

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

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  width: 32px;
  height: 32px;
  padding: 4px;
}

.mobile-menu-toggle span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: var(--transition-base);
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

@media (max-width: 768px) {
  .nav {
    height: 64px;
  }
  
  .logo {
    font-size: 20px;
  }
  
  .logo-icon {
    width: 28px;
    height: 28px;
  }
  
  .nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg-white);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: var(--spacing-md);
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }
  
  .nav-menu.active {
    transform: translateX(0);
  }
  
  .nav-menu li {
    width: 100%;
    border-bottom: 1px solid var(--color-border);
  }
  
  .nav-link {
    display: block;
    padding: var(--spacing-sm) 0;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
}


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

.hero-banner {
  position: relative;
  width: 100%;
  margin-top: 80px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-secondary) 0%, #FFFFFF 100%);
}

.hero-banner-image {
  width: 100%;
  height: auto;
  display: block;
  /* 画像読み込み高速化 */
  content-visibility: auto;
}

.hero-banner-overlay {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
}

@media (max-width: 768px) {
  .hero-banner {
    margin-top: 64px;
  }
  
  .hero-banner-overlay {
    bottom: 20px;
  }
  
  .hero-banner-overlay .btn {
    padding: 12px 28px;
    font-size: 14px;
  }
}


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

.features-section {
  background: linear-gradient(180deg, var(--color-bg-white) 0%, var(--color-bg-light) 100%);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card {
  padding: var(--spacing-lg);
  text-align: center;
  border-radius: var(--radius-md);
  background-color: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease, box-shadow 0.3s ease;
}

.feature-card.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-sm);
}

.feature-icon-image {
  width: 240px;
  height: 240px;
  margin: 0 auto var(--spacing-sm);
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.feature-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.feature-description {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .feature-card {
    padding: var(--spacing-md);
  }
}


/* ========================================
   使い方セクション
   ======================================== */

.how-to-use-section {
  background: linear-gradient(180deg, var(--color-bg-light) 0%, var(--color-bg-accent) 100%);
}

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

.step-card {
  text-align: center;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.step-card.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.step-image {
  height: 400px;
  margin-bottom: var(--spacing-md);
  align-content: center;
}

.step-placeholder {
  width: 120px;
  height: 120px;
  margin: 0 auto;
  background-color: var(--color-secondary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 64px;
}

.step-image-file {
  /* width: 200px; */
  height: 400px;
  margin: 0 auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.step-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.step-description {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

@media (max-width: 768px) {
  .steps-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}


/* ========================================
   ユーザーの声セクション
   ======================================== */

.voices-section {
  background: linear-gradient(180deg, var(--color-bg-accent) 0%, var(--color-bg-white) 100%);
}

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

.voice-card {
  padding: var(--spacing-lg);
  background-color: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-md);
  text-align: center;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease, box-shadow 0.3s ease;
}

.voice-card.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.voice-card:hover {
  box-shadow: var(--shadow-md);
}

.voice-avatar {
  margin-bottom: var(--spacing-sm);
}

.avatar-placeholder {
  width: 80px;
  height: 80px;
  margin: 0 auto;
  background-color: var(--color-secondary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
}

.avatar-image {
  width: 120px;
  height: 120px;
  margin: 0 auto;
  border-radius: var(--radius-full);
  object-fit: cover;
}

.voice-name {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--color-text-primary);
}

.voice-role {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.voice-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  text-align: left;
  font-style: normal;
}

@media (max-width: 768px) {
  .voices-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .voice-card {
    padding: var(--spacing-md);
  }
}


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

.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-light);
}

.cta-content {
  text-align: center;
}

.cta-title {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: var(--spacing-md);
}

.cta-description {
  font-size: 18px;
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
  opacity: 0.95;
}

@media (max-width: 768px) {
  .cta-title {
    font-size: 28px;
  }
  
  .cta-description {
    font-size: 16px;
  }
}


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

.footer {
  background-color: #4A4A4A;
  color: var(--color-text-light);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary-light);
}

.footer-description {
  font-size: 14px;
  line-height: 1.7;
  opacity: 0.8;
}

.footer-heading {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

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

.footer-links a {
  font-size: 14px;
  opacity: 0.8;
  transition: var(--transition-base);
}

.footer-links a:hover {
  opacity: 1;
  color: var(--color-primary-light);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-md);
  text-align: center;
}

.footer-bottom .footer-legal {
  font-size: 12px;
  opacity: 0.85;
  margin-top: var(--spacing-xs);
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}


/* ========================================
   アニメーション用クラス
   ======================================== */

.animate-in {
  animation: fadeInUp 0.8s ease forwards;
}