@import url('https://fonts.googleapis.com/css2?family=Zen+Kaku+Gothic+New:wght@500;700&display=swap');

:root {
  /* Hirakutabi Subtle Accent Color System */
  --primary: #0d5c63;              /* 青緑 (Teal Accent) */
  --primary-hover: #084348;
  --primary-light: #f0f7f7;
  
  --bg-warm: #f7f3eb;             /* ベージュ (Beige Accent) */
  --bg-warm-border: #e8e2d5;
  
  --bg-main: #ffffff;
  --bg-sub: #faf9f6;
  --bg-card: #ffffff;
  
  --text-main: #1f2937;            /* やわらかいダークグレー */
  --text-muted: #6b7280;
  --text-light: #9ca3af;
  
  --border-color: #f3f4f6;
  --border-strong: #e5e7eb;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

/* 本文・ナビ・ボタンは OS標準 system-ui */
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* ブランド名および主要見出しは Zen Kaku Gothic New */
.site-brand,
h1,
h2,
.hero-app-name,
.page-title,
.section-title-minimal {
  font-family: 'Zen Kaku Gothic New', sans-serif;
  font-weight: 600;
}

/* Accessibility: Focus Visible */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

button:focus:not(:focus-visible),
a:focus:not(:focus-visible),
summary:focus:not(:focus-visible) {
  outline: none;
}

/* Header & Navigation */
.site-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 920px;
  margin: 0 auto;
  padding: 1.1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ヘッダーブランド: 「お」アイコン削除、文字のみで構成 */
.site-brand {
  text-decoration: none;
  color: var(--text-main);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: opacity var(--transition-fast);
}

.site-brand:hover {
  opacity: 0.75;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  font-weight: 600;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.35rem;
  cursor: pointer;
  padding: 0.25rem;
}

/* Main Container */
main.main-content {
  flex: 1;
  max-width: 920px;
  width: 100%;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

/* Brand Top */
.brand-page {
  min-height: 0;
}

.brand-header {
  position: static;
  background: var(--bg-main);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.brand-header .header-container {
  max-width: 760px;
  padding-top: 0.8rem;
  padding-bottom: 0.8rem;
}

.brand-header .site-brand {
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.03em;
}

main.brand-home {
  flex: none;
  max-width: 760px;
  padding-top: 3.4rem;
  padding-bottom: 0;
}

.brand-intro {
  padding-bottom: 2.75rem;
  margin-bottom: 2.25rem;
  border-bottom: 1px solid var(--border-color);
}

.brand-title {
  margin-bottom: 0.75rem;
  color: var(--text-main);
  font-size: clamp(2rem, 4vw, 2.65rem);
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.brand-lead {
  max-width: 700px;
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.8;
}

.products-section .section-header-minimal {
  margin-bottom: 0.9rem;
}

.products-section .section-title-minimal {
  font-size: 1rem;
}

.product-list {
  display: grid;
  gap: 0.85rem;
}

.product-item {
  display: flex;
  align-items: flex-start;
  gap: 1.1rem;
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
}

.product-link-icon {
  width: 58px;
  height: 58px;
  flex-shrink: 0;
  object-fit: cover;
  border: 1px solid var(--bg-warm-border);
  border-radius: 13px;
}

.product-link-body {
  flex: 1;
  min-width: 0;
}

.product-link-body h3 {
  margin-bottom: 0.15rem;
  font-family: 'Zen Kaku Gothic New', sans-serif;
  font-size: 1.08rem;
  font-weight: 600;
}

.product-catch {
  margin-bottom: 0.15rem;
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 600;
}

.product-description {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.65;
}

.product-detail-link {
  display: inline-block;
  margin-top: 0.45rem;
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
}

.product-detail-link:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.brand-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  padding-bottom: 2rem;
}

.brand-footer .footer-container {
  max-width: 760px;
  gap: 0;
}

.survey-standalone main.main-content {
  padding-top: 5rem;
}

/* Hirakutabi-Focused Minimal Hero Section */
.hero-section-hirakutabi {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-bottom: 3.5rem;
}

.hero-app-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

/* 「ひらくたび」アプリアイコン: 存在感をしっかり出すサイズ (72px) */
.hero-app-icon {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--bg-warm-border);
}

.hero-app-title-group {
  display: flex;
  flex-direction: column;
}

.hero-app-name {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--text-main);
}

.hero-app-catch {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  margin-top: 0.2rem;
}

.hero-app-sub {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.7;
  margin-bottom: 1.75rem;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Accent Buttons & Badges */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.25rem;
  background: var(--primary);
  color: #ffffff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

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

.status-badge-warm {
  display: inline-flex;
  align-items: center;
  padding: 0.6rem 0.95rem;
  background: var(--bg-warm);
  color: #574d3f;
  border: 1px solid var(--bg-warm-border);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
}

/* Minimal Section Headers */
.section-header-minimal {
  margin-bottom: 1.5rem;
}

.section-title-minimal {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: -0.01em;
  margin-bottom: 0.35rem;
}

.section-desc-minimal {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Minimal Grid Layout for Material Cards */
.materials-grid {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: 1.25rem;
}

@media (min-width: 580px) {
  .materials-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .materials-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* Minimal Material Card */
.material-card {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.material-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.card-image-wrapper {
  width: 100%;
  aspect-ratio: 1 / 1;
  max-height: 160px;
  background: var(--bg-sub);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  padding: 0.75rem;
}

.card-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-title {
  font-size: 0.98rem;
  font-weight: 600;
  font-family: 'Zen Kaku Gothic New', sans-serif;
  line-height: 1.4;
  margin-bottom: 0.35rem;
  color: var(--text-main);
}

.card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  flex: 1;
  line-height: 1.6;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

.file-type-badge {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-light);
}

.download-btn {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.material-card:hover .download-btn {
  color: var(--primary-hover);
}

/* Page Containers */
.page-header {
  margin-bottom: 2.5rem;
}

.page-title {
  font-size: 1.85rem;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}

.page-subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.content-block {
  margin-bottom: 3rem;
}

.content-block h2 {
  font-size: 1.15rem;
  font-weight: 600;
  font-family: 'Zen Kaku Gothic New', sans-serif;
  margin: 1.75rem 0 0.75rem;
  color: var(--text-main);
}

.content-block h2:first-child {
  margin-top: 0;
}

.content-block p {
  margin-bottom: 1rem;
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.8;
}

.content-block ul, .content-block ol {
  margin-bottom: 1rem;
  padding-left: 1.4rem;
}

.content-block li {
  margin-bottom: 0.4rem;
  font-size: 0.95rem;
  color: var(--text-main);
}

/* Native FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

details.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

details.faq-item[open] {
  border-color: var(--primary);
}

summary.faq-question {
  padding: 1.1rem 1.25rem;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  list-style: none;
  user-select: none;
}

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

.faq-q-tag {
  font-weight: 700;
  color: var(--primary);
  margin-right: 0.5rem;
}

.faq-toggle-icon {
  font-size: 0.85rem;
  color: var(--text-light);
  transition: transform var(--transition-normal);
}

details[open] summary.faq-question .faq-toggle-icon {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  padding: 1rem 1.25rem 1.25rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-sub);
}

.faq-answer p {
  color: var(--text-main);
  font-size: 0.92rem;
  line-height: 1.75;
}

/* Minimal Footer */
.site-footer {
  background: var(--bg-main);
  border-top: 1px solid var(--border-color);
  padding: 3rem 1.5rem 2.5rem;
  margin-top: auto;
}

.footer-container {
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.5rem;
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  flex-wrap: wrap;
}

.footer-nav a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

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

.copyright {
  color: var(--text-light);
  font-size: 0.8rem;
}

/* Responsive Overrides */
@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #ffffff;
    flex-direction: column;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-strong);
    gap: 1rem;
    align-items: flex-start;
  }
  
  .nav-links.show {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero-app-header {
    align-items: flex-start;
  }

  .hero-app-icon {
    width: 60px;
    height: 60px;
  }
  
  .hero-app-name {
    font-size: 1.85rem;
  }

  .hero-app-catch {
    font-size: 1.05rem;
  }

  .footer-container {
    align-items: center;
    text-align: center;
  }
  
  .footer-nav {
    justify-content: center;
  }

  main.brand-home {
    padding: 2.6rem 1.25rem 0;
  }

  .brand-intro {
    padding-bottom: 2.25rem;
    margin-bottom: 2rem;
  }

  .brand-title {
    font-size: 1.85rem;
  }

  .brand-lead {
    font-size: 0.95rem;
  }

  .brand-header .header-container {
    padding: 0.75rem 1.25rem;
  }

  .product-item {
    gap: 0.9rem;
    padding: 1rem;
  }

  .product-link-icon {
    width: 52px;
    height: 52px;
  }

  .product-description {
    overflow-wrap: anywhere;
  }

  .brand-footer {
    margin-top: 2.5rem;
    padding: 1.35rem 1.25rem 1.75rem;
  }

  .brand-footer .footer-container {
    align-items: flex-start;
    text-align: left;
  }
}