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

:root {
  --color-primary: #2D6A4F;
  --color-primary-light: #40916C;
  --color-primary-dark: #1B4332;
  --color-secondary: #D4A373;
  --color-secondary-light: #E9C89B;
  --color-accent: #E76F51;
  --color-accent-light: #F4A261;
  --color-bg: #FEFAE0;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #F5F0DC;
  --color-text: #1A1A2E;
  --color-text-secondary: #6B7280;
  --color-text-tertiary: #9CA3AF;
  --color-text-on-primary: #FFFFFF;
  --color-border: #E5E1D8;
  --color-border-light: #F0ECE3;
  --color-mineral: #6B8E23;
  --color-rock: #8B7355;
  --color-gemstone: #9370DB;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Hiragino Sans", "Noto Sans JP", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;
  --max-width: 960px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 8px 40px rgba(0, 0, 0, 0.12);
  --transition: 0.2s 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-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  color: var(--color-primary-dark);
}

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

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

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--color-primary);
  color: var(--color-text-on-primary);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  z-index: 1000;
  font-size: 14px;
}

.skip-link:focus {
  top: 16px;
}

header.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(254, 250, 224, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-text);
}

.header-brand:hover {
  color: var(--color-text);
}

.header-logo {
  width: 36px;
  height: 36px;
  color: var(--color-primary);
}

.header-title {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  transition: all var(--transition);
  cursor: pointer;
  background: var(--color-surface);
}

.lang-switch:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(45, 106, 79, 0.04);
}

.lang-switch svg {
  width: 16px;
  height: 16px;
}

.hero {
  padding: 80px 0 64px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    rgba(45, 106, 79, 0.07) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.hero-icon {
  width: 96px;
  height: 96px;
  margin: 0 auto 24px;
  color: var(--color-primary);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.2;
}

.hero-tagline {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--color-text-secondary);
  max-width: 480px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-badges {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-lg);
  font-size: 14px;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.store-badge svg {
  width: 20px;
  height: 20px;
}

.store-badge.app-store {
  background: var(--color-text);
  color: var(--color-text-on-primary);
}

.store-badge.app-store:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.store-badge.google-play {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.store-badge.google-play:hover {
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.section {
  padding: 64px 0;
}

.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  line-height: 1.3;
}

.section-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 560px;
  line-height: 1.7;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header .section-desc {
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
  opacity: 0;
  transition: opacity var(--transition);
}

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

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

.feature-icon {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
}

.feature-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 640px;
  margin: 0 auto;
  position: relative;
}

.steps-list::before {
  content: "";
  position: absolute;
  left: 28px;
  top: 48px;
  bottom: 48px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--color-primary),
    var(--color-secondary)
  );
  border-radius: 2px;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 24px 0;
  position: relative;
}

.step-number {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-text-on-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
  position: relative;
  z-index: 1;
  box-shadow: 0 0 0 6px var(--color-bg);
}

.step-content {
  flex: 1;
  padding-top: 6px;
}

.step-content h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.step-content p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.step-icon {
  width: 24px;
  height: 24px;
  color: var(--color-primary-light);
  margin-right: 6px;
  vertical-align: middle;
}

.faq-list {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item.active {
  border-color: var(--color-primary);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 18px 20px;
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  text-align: left;
  line-height: 1.5;
  transition: color var(--transition);
}

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

.faq-chevron {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-left: 12px;
  color: var(--color-text-tertiary);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

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

.faq-answer-inner {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.contact-section {
  text-align: center;
}

.contact-card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 48px 32px;
  max-width: 480px;
  margin: 0 auto;
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-md);
}

.contact-icon {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  margin: 0 auto 16px;
}

.contact-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.contact-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--color-primary);
  color: var(--color-text-on-primary);
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  transition: all var(--transition);
}

.contact-email:hover {
  background: var(--color-primary-dark);
  color: var(--color-text-on-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.contact-email svg {
  width: 18px;
  height: 18px;
}

.divider {
  width: 48px;
  height: 3px;
  background: linear-gradient(
    to right,
    var(--color-primary),
    var(--color-secondary)
  );
  border-radius: 3px;
  margin: 0 auto 16px;
}

footer.site-footer {
  background: var(--color-primary-dark);
  color: var(--color-text-on-primary);
  padding: 48px 0 32px;
}

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

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  margin-bottom: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.footer-logo {
  width: 32px;
  height: 32px;
  color: var(--color-text-on-primary);
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 800;
}

.footer-desc {
  font-size: 13px;
  opacity: 0.7;
  max-width: 280px;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.footer-links-group h4 {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.5;
  margin-bottom: 12px;
}

.footer-links-group ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links-group a {
  font-size: 14px;
  color: var(--color-text-on-primary);
  opacity: 0.8;
  transition: opacity var(--transition);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  opacity: 0.5;
}

.footer-bottom a {
  color: var(--color-text-on-primary);
  opacity: 0.8;
}

.footer-bottom a:hover {
  opacity: 1;
  color: var(--color-text-on-primary);
}

.page-template {
  padding: 64px 0 80px;
}

.page-template .container {
  max-width: 720px;
}

.page-template h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-border);
}

.page-template h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 36px 0 12px;
  padding-top: 8px;
}

.page-template h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 24px 0 8px;
}

.page-template p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.page-template ul,
.page-template ol {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  padding-left: 24px;
}

.page-template li {
  margin-bottom: 6px;
}

.page-template a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-template a:hover {
  color: var(--color-primary-dark);
}

.page-template strong {
  color: var(--color-text);
  font-weight: 600;
}

.page-template .last-updated {
  display: inline-block;
  font-size: 13px;
  color: var(--color-text-tertiary);
  margin-bottom: 32px;
}

.placeholder-notice {
  background: var(--color-surface);
  border: 1.5px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 24px;
  text-align: center;
}

.placeholder-notice svg {
  width: 40px;
  height: 40px;
  color: var(--color-text-tertiary);
  margin-bottom: 12px;
}

.placeholder-notice p {
  font-size: 14px;
  color: var(--color-text-tertiary);
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .hero {
    padding: 48px 0 40px;
  }

  .hero-icon {
    width: 72px;
    height: 72px;
  }

  .hero-badges {
    flex-direction: column;
    align-items: center;
  }

  .store-badge {
    width: 100%;
    max-width: 260px;
    justify-content: center;
  }

  .section {
    padding: 48px 0;
  }

  .section-header {
    margin-bottom: 32px;
  }

  .steps-list::before {
    left: 27px;
  }

  .step-number {
    width: 54px;
    height: 54px;
    font-size: 18px;
  }

  .footer-top {
    flex-direction: column;
    gap: 24px;
  }

  .footer-links {
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .header-inner {
    padding: 12px 20px;
  }

  .feature-card {
    padding: 24px 20px;
  }

  .contact-card {
    padding: 32px 24px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .step-item {
    gap: 16px;
  }

  .step-number {
    width: 48px;
    height: 48px;
    font-size: 16px;
  }

  .steps-list::before {
    left: 23px;
  }
}