/* ==========================================================================
   BathTimeFish corporate site — shared stylesheet
   Used by every page under www.bathtimefish.com.
   Page-specific rules live next to each page (kraken/kraken.css, ...).
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  --primary: #0f4c81;
  --primary-dark: #0a3559;
  --primary-light: #e6f0fa;
  --accent: #00b894;
  --accent-light: #e0f8f3;

  --text-main: #2d3436;
  --text-muted: #636e72;
  --text-inverse: #ffffff;

  --bg-main: #ffffff;
  --bg-alt: #f8f9fa;
  --bg-dark: #1f2933;
  --border: #dfe6e9;

  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.12);
  --shadow-soft: 0 2px 6px rgba(0, 0, 0, 0.05);

  --font-sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP",
               "Yu Gothic", Meiryo, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, "Courier New", monospace;

  --radius: 8px;
  --radius-pill: 999px;
  --container: 1000px;
  --header-h: 60px;
  --section-y: 80px;
  --transition: 0.2s ease;
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 56px); }
body {
  font-family: var(--font-sans);
  color: var(--text-main);
  background: var(--bg-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: inline-block; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { list-style: none; }
button { font: inherit; color: inherit; }
h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; }
strong { font-weight: 700; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }
.mt-lg { margin-top: 40px; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* ---------- Site header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  height: var(--header-h);
  background: var(--bg-main);
  border-bottom: 1px solid var(--border);
}
.site-header-inner {
  position: relative;
  height: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
.site-brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--text-main); font-weight: 700; letter-spacing: 0.02em;
}
.site-brand:hover { text-decoration: none; opacity: 0.8; }
.site-brand img { width: 32px; height: 32px; }
.site-brand-name { font-size: 1rem; }

.site-nav-list { display: flex; align-items: center; gap: 4px; }
.site-nav-list a,
.nav-dropdown > summary {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius);
  color: var(--text-main);
  font-size: 0.92rem; font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.site-nav-list a:hover,
.nav-dropdown > summary:hover,
.nav-dropdown[open] > summary { background: var(--bg-alt); color: var(--primary); text-decoration: none; }

.nav-dropdown { position: relative; }
.nav-dropdown > summary { list-style: none; }
.nav-dropdown > summary::-webkit-details-marker { display: none; }
.nav-dropdown > summary::after {
  content: ""; display: inline-block; margin-left: 8px; vertical-align: 2px;
  width: 6px; height: 6px;
  border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg); transition: transform var(--transition);
}
.nav-dropdown[open] > summary::after { transform: rotate(-135deg); vertical-align: -2px; }
.nav-dropdown-menu {
  position: absolute; top: calc(100% + 6px); left: 0;
  min-width: 200px;
  padding: 8px;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.nav-dropdown-menu a { padding: 10px 12px; white-space: nowrap; }
.nav-dropdown-menu a small { display: block; font-size: 0.78rem; font-weight: 400; color: var(--text-muted); }

.nav-toggle {
  display: none;
  flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 44px;
  background: none; border: none; cursor: pointer; padding: 10px;
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text-main); transition: transform var(--transition), opacity var(--transition); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Product page sub-navigation ---------- */
.page-nav {
  position: sticky; top: var(--header-h); z-index: 900;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}
.page-nav-inner { display: flex; align-items: center; gap: 24px; height: 52px; }
.page-nav-brand {
  display: flex; align-items: center; gap: 8px; flex-shrink: 0;
  color: var(--text-main); font-weight: 700; font-size: 1.05rem;
}
.page-nav-brand:hover { text-decoration: none; opacity: 0.8; }
.page-nav-brand img { height: 26px; width: auto; }
.page-nav-links { display: flex; align-items: center; gap: 2px; flex: 1; min-width: 0; overflow-x: auto; scrollbar-width: none; }
.page-nav-links::-webkit-scrollbar { display: none; }
.page-nav-links a {
  padding: 6px 10px; border-radius: var(--radius);
  color: var(--text-muted); font-size: 0.85rem; font-weight: 500; white-space: nowrap;
}
.page-nav-links a:hover { background: var(--bg-alt); color: var(--primary); text-decoration: none; }
.page-nav-links a.nav-cta { color: var(--primary); font-weight: 600; }
.lang-switch {
  flex-shrink: 0;
  padding: 4px 10px;
  border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text-muted); font-size: 0.8rem;
}
.lang-switch:hover { background: var(--bg-alt); text-decoration: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border: 2px solid transparent; border-radius: var(--radius);
  font-size: 1rem; font-weight: 600; text-align: center; line-height: 1.4;
  cursor: pointer; transition: background var(--transition), color var(--transition), box-shadow var(--transition);
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--primary); color: var(--text-inverse); border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: var(--text-inverse); box-shadow: var(--shadow-hover); }
.btn-secondary { background: var(--bg-main); color: var(--primary); border-color: var(--primary); }
.btn-secondary:hover { background: var(--primary-light); }
.btn-large { padding: 16px 36px; font-size: 1.1rem; }
.btn-group { display: flex; flex-wrap: wrap; gap: 14px; }
.btn-group.is-center { justify-content: center; }

/* ---------- Sections ---------- */
.section { padding: var(--section-y) 0; }
.section-alt { background: var(--bg-alt); }
.section-highlight { background: var(--primary-light); }
.section-band { background: linear-gradient(180deg, var(--bg-main) 0%, var(--primary-light) 50%, var(--bg-main) 100%); }
.section-cta { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); color: var(--text-inverse); }
.section-cta a:not(.btn) { color: var(--text-inverse); }

.section-header { text-align: center; margin-bottom: 48px; }
.section-title { text-align: center; font-size: 2rem; color: var(--primary); margin-bottom: 16px; }
.section-header .section-title:last-child { margin-bottom: 0; }
.section-lead {
  text-align: center; max-width: 780px; margin: 0 auto 48px;
  font-size: 1.05rem; line-height: 1.8; color: var(--text-muted);
}
.section-header .section-lead { margin-bottom: 0; }
.section-note { text-align: center; margin-top: 32px; color: var(--text-muted); }
.section-cta .section-title, .section-cta .section-lead { color: var(--text-inverse); }
.section-cta .section-lead { opacity: 0.92; }

/* ---------- Product hero ---------- */
.hero { padding: 64px 0; background: linear-gradient(135deg, var(--primary-light) 0%, var(--bg-main) 100%); }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.hero-title { font-size: 2.5rem; line-height: 1.2; color: var(--primary); margin-bottom: 16px; }
.hero-sub { font-size: 1.2rem; font-weight: 400; color: var(--text-muted); margin-bottom: 20px; line-height: 1.5; }
.hero-text { font-size: 1rem; line-height: 1.8; margin-bottom: 20px; }
.hero-note { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 28px; }
.hero-content > .btn-group { margin-top: 28px; }
.hero-visual { text-align: center; }
.hero-visual img { border-radius: var(--radius); }
.hero-visual .is-photo { box-shadow: var(--shadow); }

/* ---------- Grids ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; }
.grid-auto-sm { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; }
.grid-auto-lg { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

/* ---------- Cards ---------- */
.card {
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.card h3, .card-title { font-size: 1.15rem; color: var(--primary); margin-bottom: 10px; }
.card p, .card-text { font-size: 0.95rem; color: var(--text-muted); line-height: 1.7; }
.card p + p { margin-top: 10px; }
.card-icon { font-size: 2.5rem; line-height: 1; margin-bottom: 16px; display: block; }
.card-hover:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.card-center { text-align: center; }
.card-alt { background: var(--bg-alt); }
.card-accent { border-left: 4px solid var(--accent); }
.card-highlight { background: var(--primary-light); border-color: var(--primary); }
.card-outline { border-color: var(--primary); }
.card-top { border-top: 4px solid var(--primary); }
.card-span { grid-column: 1 / -1; }

/* ---------- Small components ---------- */
.badge {
  display: inline-block; padding: 4px 12px;
  background: var(--primary); color: var(--text-inverse);
  border-radius: var(--radius-pill);
  font-size: 0.75rem; font-weight: 600; line-height: 1.4; letter-spacing: 0.02em;
}
.badge-soft { background: var(--primary-light); color: var(--primary); padding: 2px 8px; }

.tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.tag-list.is-center { justify-content: center; }
.tag {
  font-size: 0.8rem; padding: 4px 12px;
  background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius-pill);
}

.notice {
  padding: 14px 16px;
  background: var(--accent-light);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  margin-bottom: 16px;
}
.notice-info { background: var(--primary-light); border-left-color: var(--primary); }
.notice-inverse { background: rgba(255, 255, 255, 0.18); border-left-color: rgba(255, 255, 255, 0.7); }

.check-list li {
  position: relative; padding: 8px 0 8px 26px;
  font-size: 0.95rem; line-height: 1.6;
}
.check-list li::before {
  content: "\2713"; position: absolute; left: 0; top: 8px;
  color: var(--accent); font-weight: 700;
}
.check-list.is-muted li { color: var(--text-muted); }
.bullet-list { list-style: disc; padding-left: 22px; }
.bullet-list li { margin-bottom: 6px; font-size: 0.95rem; }

/* Flow diagram: step -> step -> step */
.flow {
  display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 12px;
  padding: 28px; margin: 32px 0;
  background: var(--bg-alt); border-radius: var(--radius);
}
.flow-step {
  padding: 12px 20px;
  background: var(--bg-main);
  border: 2px solid var(--border); border-radius: var(--radius);
  font-size: 0.9rem; font-weight: 600; white-space: nowrap;
}
.flow-step-highlight { background: var(--primary); color: var(--text-inverse); border-color: var(--primary); }
.flow-arrow { color: var(--text-muted); font-size: 1.25rem; font-weight: 700; }
.flow-on-light { background: var(--bg-main); border: 1px solid var(--border); }

/* Data table */
.table-wrap { overflow-x: auto; margin-bottom: 40px; }
.data-table {
  width: 100%; border-collapse: collapse;
  background: var(--bg-main);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow);
}
.data-table thead { background: var(--primary); color: var(--text-inverse); }
.data-table th, .data-table td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
.data-table th { font-weight: 600; }
.data-table tbody tr:hover { background: var(--bg-alt); }
.data-table tbody tr:last-child td { border-bottom: none; }

/* FAQ accordion */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-main);
  border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 14px; overflow: hidden;
  box-shadow: var(--shadow-soft);
}
.faq-q {
  width: 100%; padding: 18px 22px;
  background: none; border: none; text-align: left;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  font-size: 1rem; font-weight: 600; color: var(--primary);
  cursor: pointer; transition: background var(--transition);
}
.faq-q:hover { background: var(--bg-alt); }
.faq-icon { flex-shrink: 0; font-size: 1.5rem; font-weight: 300; line-height: 1; transition: transform var(--transition); }
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-item.active .faq-a { max-height: 600px; }
.faq-a p { padding: 0 22px 20px; font-size: 0.95rem; line-height: 1.7; color: var(--text-muted); }

/* CTA section building blocks */
.cta-content { max-width: 800px; margin: 0 auto; text-align: center; }
.cta-title { font-size: 2rem; margin-bottom: 20px; }
.cta-text { font-size: 1rem; line-height: 1.8; margin-bottom: 20px; opacity: 0.95; }
.cta-box {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  padding: 28px; margin: 28px auto; text-align: left;
}
.cta-box h3 { text-align: center; font-size: 1.2rem; margin-bottom: 16px; }
.cta-box .check-list li::before { color: var(--text-inverse); }

/* ---------- Top page ---------- */
.home-hero { padding: 88px 0 64px; text-align: center; background: linear-gradient(180deg, var(--primary-light) 0%, var(--bg-main) 100%); }
.home-hero img { width: 120px; height: 120px; margin-bottom: 20px; }
.home-hero h1 { font-size: 1.9rem; letter-spacing: 0.02em; margin-bottom: 4px; }
.home-hero .home-name-en { display: block; color: var(--text-muted); font-size: 0.95rem; font-weight: 400; letter-spacing: 0.08em; margin-bottom: 24px; }
.home-hero .home-lead { max-width: 640px; margin: 0 auto; color: var(--text-muted); font-size: 1.05rem; line-height: 1.9; }

.product-card { display: flex; flex-direction: column; padding: 32px; }
.product-card-head { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.product-card-head img { height: 40px; width: auto; }
.product-card-icon { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 9px; background: var(--primary); color: #fff; }
.product-card-icon svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linejoin: round; }
.product-card-icon svg circle { fill: currentColor; stroke: none; }
.product-grid .product-card { padding: 26px; }
.product-grid .product-card-head h3 { font-size: 1.15rem; }
.product-grid .product-card-tagline { font-size: 0.98rem; }
.product-grid .product-card .btn { align-self: stretch; padding: 10px 14px; font-size: 0.9rem; }
.product-card-head h3, .product-card-head .product-card-name { font-size: 1.35rem; color: var(--text-main); margin: 0; }
.product-card-tagline { font-size: 1.05rem; font-weight: 600; color: var(--primary); margin-bottom: 10px; }
.product-card-text { flex: 1; margin-bottom: 22px; }
.product-card .btn { align-self: flex-start; }

.home-company { text-align: center; }
.home-company p { max-width: 640px; margin: 0 auto 28px; color: var(--text-muted); }

/* ---------- Company profile page ---------- */
.page-header { padding: 56px 0 40px; text-align: center; }
.page-header h1 { font-size: 1.9rem; color: var(--primary); margin-bottom: 8px; }
.page-header .page-subtitle { color: var(--text-muted); font-size: 0.95rem; letter-spacing: 0.06em; }
.article { max-width: 760px; margin: 0 auto; padding: 0 20px 80px; }
.article h2 {
  margin: 48px 0 16px; padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  font-size: 1.15rem; color: var(--primary); letter-spacing: 0.04em;
}
.article h2:first-child { margin-top: 0; }
.profile-table { width: 100%; border-collapse: collapse; }
.profile-table th, .profile-table td {
  padding: 14px 4px; border-bottom: 1px solid var(--border);
  text-align: left; vertical-align: top; font-size: 0.95rem;
}
.profile-table th { width: 34%; font-weight: 600; color: var(--text-muted); white-space: nowrap; }
.profile-table th .en { display: block; margin-top: -2px; font-size: 0.78rem; font-weight: 400; letter-spacing: 0.02em; }
.profile-table td .en { display: block; color: var(--text-muted); font-size: 0.85rem; }
.article .bullet-list li .en { display: block; color: var(--text-muted); font-size: 0.85rem; }

/* ---------- Site footer ---------- */
.site-footer { background: var(--bg-dark); color: rgba(255, 255, 255, 0.85); padding: 56px 0 28px; font-size: 0.9rem; }
.site-footer a { color: rgba(255, 255, 255, 0.85); }
.site-footer a:hover { color: #fff; }
.site-footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.site-footer-brand img { width: 40px; height: 40px; margin-bottom: 12px; }
.site-footer-name { font-weight: 700; font-size: 1rem; color: #fff; }
.site-footer-name span { display: block; font-weight: 400; font-size: 0.8rem; letter-spacing: 0.06em; opacity: 0.75; }
.site-footer-address { margin-top: 10px; font-size: 0.85rem; opacity: 0.75; }
.site-footer h4 { color: #fff; font-size: 0.95rem; margin-bottom: 14px; }
.site-footer li { margin-bottom: 8px; }
.site-footer-bottom { padding-top: 24px; border-top: 1px solid rgba(255, 255, 255, 0.12); text-align: center; font-size: 0.8rem; opacity: 0.7; }
.site-footer-bottom p + p { margin-top: 6px; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  :root { --section-y: 56px; }
  .nav-toggle { display: flex; }
  .site-nav {
    display: none;
    position: absolute; top: var(--header-h); left: 0; right: 0;
    background: var(--bg-main);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 8px 12px 16px;
  }
  .site-nav.is-open { display: block; }
  .site-nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav-list a, .nav-dropdown > summary { padding: 12px 14px; font-size: 1rem; }
  .nav-dropdown-menu { position: static; min-width: 0; border: none; box-shadow: none; padding: 0 0 4px 12px; }
  .nav-dropdown-menu a { padding: 10px 14px; }

  .page-nav-inner { gap: 12px; }
  .page-nav-brand .badge { display: none; }

  .hero { padding: 40px 0; }
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero-title { font-size: 1.9rem; }
  .section-title, .cta-title { font-size: 1.55rem; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .btn-group { flex-direction: column; }
  .btn-group .btn { width: 100%; }
  .flow { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
  .data-table th, .data-table td { padding: 10px 8px; font-size: 0.8rem; }

  .home-hero { padding: 56px 0 40px; }
  .home-hero h1 { font-size: 1.5rem; }
  .profile-table th, .profile-table td { display: block; width: 100%; }
  .profile-table th { padding-bottom: 0; border-bottom: none; }
  .profile-table td { padding-top: 4px; }

  .site-footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

@media print {
  .site-header, .page-nav, .nav-toggle, .btn, .site-footer { display: none; }
  .section { page-break-inside: avoid; }
}