/* ============================================
   リセット・基本設定
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-white: #FFFFFF;
  --color-warm-gray: #FAF8F6;
  --color-accent: #ED9D5C;
  --color-accent-hover: #E08A45;
  --color-accent-light: #FDF0E6;
  --color-text: #2B2B2B;
  --color-text-sub: #6B6B6B;
  --color-border: #E8E4E0;
  --radius-large: 20px;
  --radius-medium: 14px;
  --radius-small: 8px;
  --shadow-subtle: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.07);
  --max-width: 720px;
  --spacing-section: 64px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Yu Gothic Medium", "Noto Sans JP", Meiryo, sans-serif;
  --transition: 0.3s ease;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-white);
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--color-accent-hover);
}

/* フォーカスの見た目 */
a:focus-visible,
summary:focus-visible,
details:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-small);
}

/* 共通：コンテナ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 共通：見出し */
.section-heading {
  text-align: center;
  margin-bottom: 40px;
}

.section-heading h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
}

.heading-line {
  display: block;
  width: 40px;
  height: 3px;
  background-color: var(--color-accent);
  border-radius: 2px;
  margin: 0 auto 16px;
}

/* 共通：ボタン */
.btn {
  display: inline-block;
  padding: 14px 36px;
  border-radius: var(--radius-medium);
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  text-align: center;
  cursor: pointer;
  border: none;
  transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition);
  line-height: 1.4;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(237, 157, 92, 0.35);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-large {
  padding: 16px 44px;
  font-size: 1.05rem;
}

/* 共通：スクロール表示アニメーション */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   ヒーロー
   ============================================ */
.section-hero {
  background-color: var(--color-white);
  padding: 48px 24px 32px;
  text-align: center;
}

.hero-inner {
  max-width: 760px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  font-size: 0.7rem;
  color: var(--color-text-sub);
  background-color: var(--color-warm-gray);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.hero-icon {
  width: 88px;
  height: 88px;
  border-radius: var(--radius-large);
  margin: 0 auto 20px;
}

.hero-title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 16px;
  letter-spacing: 0.01em;
}

.hero-catchcopy {
  font-size: 1.05rem;
  color: var(--color-text-sub);
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-image {
  width: 100%;
  max-width: 560px;
  margin: 40px auto 0;
}

/* ============================================
   つくった理由
   ============================================ */
.section-reason {
  background-color: var(--color-warm-gray);
  padding: var(--spacing-section) 0;
}

.reason-text {
  max-width: 620px;
  margin: 0 auto;
}

.reason-text p {
  font-size: 1rem;
  line-height: 2;
  margin-bottom: 20px;
  color: var(--color-text);
}

.reason-note {
  font-size: 0.85rem;
  color: var(--color-text-sub);
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px dashed var(--color-border);
}

/* ============================================
   特長
   ============================================ */
.section-features {
  background-color: var(--color-white);
  padding: var(--spacing-section) 0;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.feature-card {
  background-color: var(--color-warm-gray);
  border-radius: var(--radius-large);
  padding: 32px 24px;
  text-align: center;
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.feature-icon {
  margin-bottom: 16px;
  display: flex;
  justify-content: center;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  text-wrap: balance;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-text-sub);
  line-height: 1.8;
  text-wrap: pretty;
}

.nw {
  display: inline-block;
}

/* ============================================
   画面紹介
   ============================================ */
.section-screens {
  background-color: var(--color-warm-gray);
  padding: var(--spacing-section) 0;
}

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

.screen-item {
  text-align: center;
}

.screen-image {
  width: 220px;
  margin: 0 auto;
}

.screen-caption {
  margin-top: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

/* ============================================
   使い方の流れ
   ============================================ */
.section-how-to {
  background-color: var(--color-white);
  padding: var(--spacing-section) 0;
}

.steps {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.step {
  background-color: var(--color-warm-gray);
  border-radius: var(--radius-large);
  padding: 28px 24px;
  text-align: center;
  width: 100%;
  max-width: 420px;
}

.step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: #FFFFFF;
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.step h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p {
  font-size: 0.95rem;
  color: var(--color-text-sub);
}

.step-arrow {
  display: flex;
  justify-content: center;
  transform: rotate(90deg);
}

/* ============================================
   こんな方に
   ============================================ */
.section-target {
  background-color: var(--color-warm-gray);
  padding: var(--spacing-section) 0;
}

.target-list {
  max-width: 560px;
  margin: 0 auto;
}

.target-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 24px;
  background-color: var(--color-white);
  border-radius: var(--radius-medium);
  margin-bottom: 12px;
}

.target-mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-accent);
  flex-shrink: 0;
}

.target-item p {
  font-size: 1rem;
  font-weight: 500;
}

.target-note {
  text-align: center;
  font-size: 0.95rem;
  color: var(--color-text-sub);
  margin-top: 28px;
  line-height: 1.8;
}

/* ============================================
   はじめかた
   ============================================ */
.section-getting-started {
  background-color: var(--color-white);
  padding: var(--spacing-section) 0;
}

.getting-started-intro {
  text-align: center;
  font-size: 1rem;
  color: var(--color-text-sub);
  margin-bottom: 32px;
}

.start-steps {
  list-style: none;
  counter-reset: step;
  max-width: 480px;
  margin: 0 auto;
}

.start-steps li {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 24px;
  background-color: var(--color-warm-gray);
  border-radius: var(--radius-medium);
  margin-bottom: 12px;
}

.start-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.start-text {
  font-size: 1rem;
  font-weight: 500;
}

.getting-started-note {
  font-size: 0.85rem;
  color: var(--color-text-sub);
  line-height: 1.8;
  margin-top: 28px;
  padding: 20px;
  background-color: var(--color-warm-gray);
  border-radius: var(--radius-medium);
}

/* ============================================
   記録の保管について
   ============================================ */
.section-privacy {
  background-color: var(--color-warm-gray);
  padding: var(--spacing-section) 0;
}

.privacy-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.privacy-item {
  background-color: var(--color-white);
  border-radius: var(--radius-medium);
  padding: 24px;
}

.privacy-item h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.privacy-item h3::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
  margin-right: 10px;
  vertical-align: middle;
}

.privacy-item p {
  font-size: 0.95rem;
  color: var(--color-text-sub);
  line-height: 1.8;
}

/* ============================================
   よくある質問
   ============================================ */
.section-faq {
  background-color: var(--color-white);
  padding: var(--spacing-section) 0;
}

.faq-list {
  max-width: 620px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--color-warm-gray);
  border-radius: var(--radius-medium);
  margin-bottom: 12px;
  overflow: hidden;
  transition: background-color var(--transition);
}

.faq-item[open] {
  background-color: var(--color-accent-light);
}

.faq-item summary {
  padding: 18px 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "";
  width: 12px;
  height: 12px;
  border-right: 2.5px solid var(--color-accent);
  border-bottom: 2.5px solid var(--color-accent);
  transform: rotate(45deg);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-right: 4px;
  margin-top: -4px;
}

.faq-item[open] summary::after {
  transform: rotate(-135deg);
  margin-top: 4px;
}

.faq-answer {
  padding: 0 24px 20px;
}

.faq-answer p {
  font-size: 0.95rem;
  color: var(--color-text-sub);
  line-height: 1.8;
}

/* ============================================
   フッター
   ============================================ */
.section-footer {
  background-color: var(--color-warm-gray);
  padding: 48px 24px;
  text-align: center;
}

.footer-inner {
  max-width: 480px;
  margin: 0 auto;
}

.footer-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-medium);
  margin: 0 auto 16px;
}

.footer-app-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.footer-credit {
  font-size: 0.85rem;
  color: var(--color-text-sub);
  margin-top: 32px;
}

.footer-copyright {
  font-size: 0.8rem;
  color: var(--color-text-sub);
  margin-top: 4px;
}

.footer-disclaimer {
  font-size: 0.8rem;
  color: var(--color-text-sub);
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  line-height: 1.6;
}

.footer-disclaimer,
.footer-analytics,
.footer-notice {
  word-break: auto-phrase;
  text-align: left;
}

.footer-analytics,
.footer-notice {
  font-size: 0.75rem;
  color: var(--color-text-sub);
  margin-top: 12px;
  line-height: 1.6;
}

/* ============================================
   タブレット（768px以上）
   ============================================ */
@media (min-width: 768px) {
  :root {
    --max-width: 800px;
    --spacing-section: 80px;
  }

  .section-heading h2 {
    font-size: 1.75rem;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .hero-catchcopy {
    font-size: 1.15rem;
  }

  .hero-icon {
    width: 100px;
    height: 100px;
  }

  .reason-text p {
    font-size: 1.05rem;
  }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .feature-card {
    padding: 28px 16px;
  }

  .feature-card h3 {
    font-size: 1rem;
  }

  .feature-card p {
    font-size: 0.9rem;
  }

  .screens-grid {
    flex-direction: row;
    justify-content: center;
    gap: 32px;
  }

  .screen-image {
    width: 240px;
  }

  .steps {
    flex-direction: row;
    align-items: stretch;
    gap: 0;
  }

  .step {
    flex: 1;
    max-width: none;
  }

  .step-arrow {
    align-self: center;
    transform: rotate(0deg);
    padding: 0 8px;
  }

  .privacy-list {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
}

/* ============================================
   PC（1024px以上）
   ============================================ */
@media (min-width: 1024px) {
  :root {
    --max-width: 900px;
    --spacing-section: 96px;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-catchcopy {
    font-size: 1.25rem;
  }

  .section-heading h2 {
    font-size: 2rem;
  }

  .features-grid {
    gap: 28px;
  }

  .feature-card {
    padding: 36px 28px;
  }

  .feature-card h3 {
    font-size: 1.1rem;
  }

  .feature-card p {
    font-size: 0.95rem;
  }

  .section-features .container {
    max-width: 1040px;
  }

  .screen-image {
    width: 260px;
  }
}

/* ============================================
   アクセシビリティ：視差効果を減らす
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn,
  .feature-card,
  .faq-item {
    transition: none;
  }

  .btn-primary:hover {
    transform: none;
  }

  .feature-card:hover {
    transform: none;
  }
}
.footer-credit a {
  color: var(--color-text-sub);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-credit a:hover {
  color: var(--color-accent-hover);
}

.section-about {
  padding: 48px 0 var(--spacing-section);
}

.about-header {
  text-align: center;
  margin-bottom: 40px;
}

.about-header .hero-icon {
  margin-bottom: 16px;
}

.about-app-name {
  font-size: 0.95rem;
  color: var(--color-text-sub);
}

.about-block {
  max-width: 620px;
  margin: 0 auto 40px;
}

.about-block h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
  line-height: 1.4;
}

.about-block p {
  line-height: 2;
  margin-bottom: 16px;
}

.about-mail {
  color: var(--color-text);
  font-weight: 700;
  word-break: break-all;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.about-back {
  text-align: center;
  margin-top: 48px;
}