:root {
  --ink: #102c37;
  --ink-muted: #536b74;
  --primary: #0b3d4b;
  --primary-deep: #082f3b;
  --accent: #d9a73f;
  --accent-soft: #fff3d2;
  --surface: #f6f4ed;
  --surface-soft: #edf3f1;
  --line: #d8e1de;
  --white: #fff;
  --shadow: 0 22px 70px rgba(12, 50, 62, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: Inter, "Noto Sans", "Noto Sans SC", "Noto Sans JP", "Noto Sans Arabic", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
.guide-shell { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: fixed; inset-block-start: 10px; inset-inline-start: 10px; z-index: 100; transform: translateY(-150%); padding: 10px 14px; border-radius: 6px; background: var(--white); }
.skip-link:focus { transform: none; }

.site-header { position: sticky; inset-block-start: 0; z-index: 50; border-block-end: 1px solid rgba(216, 225, 222, .9); background: rgba(255, 255, 255, .92); backdrop-filter: blur(16px); }
.header-inner { min-width: 0; min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.brand { min-width: 0; flex: 1 1 auto; }
.brand img { width: min(250px, 43vw); max-height: 48px; object-fit: contain; object-position: left center; }
[dir="rtl"] .brand img { object-position: right center; }
.header-actions { min-width: 0; flex: 0 1 auto; display: flex; align-items: center; justify-content: flex-end; gap: 12px; font-size: .86rem; font-weight: 800; }
.quiet-link { text-decoration: none; color: var(--ink-muted); }
.quiet-link:hover { color: var(--primary); }
.language-menu { position: relative; }
.language-menu summary { list-style: none; cursor: pointer; border: 1px solid var(--line); border-radius: 999px; padding: 9px 14px; background: var(--white); white-space: nowrap; }
.language-menu summary::-webkit-details-marker { display: none; }
.language-panel { position: absolute; inset-block-start: calc(100% + 10px); inset-inline-end: 0; width: min(230px, calc(100vw - 24px)); max-height: min(68vh, 560px); overflow: auto; display: grid; gap: 3px; padding: 9px; border: 1px solid var(--line); border-radius: 10px; background: var(--white); box-shadow: var(--shadow); }
.language-panel a { padding: 8px 10px; border-radius: 6px; text-decoration: none; font-weight: 700; }
.language-panel a:hover, .language-panel a.is-current { color: var(--primary); background: var(--surface-soft); }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: 12px 20px; border: 1px solid var(--primary); border-radius: 6px; color: var(--white); background: var(--primary); text-decoration: none; font-weight: 900; line-height: 1.25; box-shadow: 0 12px 30px rgba(11, 61, 75, .18); transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); background: var(--primary-deep); }
.button-small { min-height: 42px; padding: 9px 15px; font-size: .82rem; }

.hero { position: relative; overflow: hidden; padding: clamp(68px, 9vw, 120px) 0 72px; color: var(--white); background: linear-gradient(132deg, #082f3b 0%, #0d5361 70%, #146b73 100%); }
.hero::after { content: ""; position: absolute; inset: 0; opacity: .2; background: radial-gradient(circle at 15% 20%, #fff 0 1px, transparent 2px) 0 0 / 34px 34px; pointer-events: none; }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(320px, .75fr); align-items: center; gap: clamp(40px, 7vw, 86px); }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: .76rem; font-weight: 950; letter-spacing: .18em; text-transform: uppercase; }
.hero-copy { min-width: 0; }
.hero h1 { max-width: 820px; margin: 0; font-size: clamp(2.4rem, 5vw, 5rem); line-height: 1.05; letter-spacing: -.035em; overflow-wrap: anywhere; }
.hero-lead { max-width: 730px; margin: 24px 0 0; color: rgba(255, 255, 255, .82); font-size: clamp(1.02rem, 1.6vw, 1.28rem); line-height: 1.8; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 20px; margin-block-start: 32px; }
.hero .button { color: var(--primary-deep); border-color: var(--accent); background: var(--accent); box-shadow: 0 16px 35px rgba(0, 0, 0, .2); }
.text-link { color: var(--white); font-weight: 900; text-decoration-thickness: 2px; text-underline-offset: 5px; }
.hero-card { border: 1px solid rgba(255,255,255,.24); border-radius: 16px; padding: 12px; background: rgba(255,255,255,.08); box-shadow: 0 30px 80px rgba(0,0,0,.25); transform: rotate(1.5deg); }
.hero-card img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 10px; }

.guide-layout { display: grid; grid-template-columns: 255px minmax(0, 1fr); align-items: start; gap: 54px; padding-block: 70px 90px; }
.toc-card { position: sticky; inset-block-start: 104px; padding: 22px; border: 1px solid var(--line); border-radius: 10px; background: rgba(255,255,255,.82); box-shadow: 0 15px 45px rgba(14, 54, 66, .08); }
.toc-card > p { margin: 0 0 13px; color: var(--primary); font-size: .74rem; font-weight: 950; letter-spacing: .12em; text-transform: uppercase; }
.toc-card nav { display: grid; gap: 5px; }
.toc-card a { display: block; padding: 7px 9px; border-radius: 5px; color: var(--ink-muted); text-decoration: none; font-size: .84rem; font-weight: 750; line-height: 1.45; }
.toc-card a:hover { color: var(--primary); background: var(--surface-soft); }
.toc-faq { margin-block-start: 12px; border-block-start: 1px solid var(--line); padding-block-start: 14px !important; color: var(--primary) !important; }
.guide-content { min-width: 0; padding: clamp(28px, 5vw, 64px); border: 1px solid var(--line); border-radius: 12px; background: var(--white); box-shadow: var(--shadow); }
.guide-content h2 { margin: 78px 0 22px; color: var(--primary); font-size: clamp(1.8rem, 3vw, 2.75rem); line-height: 1.18; letter-spacing: -.025em; scroll-margin-top: 110px; }
.guide-content h2:first-child { margin-block-start: 0; }
.guide-content h3 { margin: 42px 0 16px; padding-block-start: 7px; color: var(--ink); font-size: clamp(1.22rem, 2vw, 1.58rem); line-height: 1.35; scroll-margin-top: 110px; }
.guide-content p { margin: 0 0 18px; color: var(--ink-muted); }
.guide-content ul { margin: 0 0 24px; padding-inline-start: 1.3rem; color: var(--ink-muted); }
.guide-content li { margin-block: 7px; padding-inline-start: 4px; }
.guide-content strong { color: var(--ink); }
.guide-content code { display: inline-block; max-width: 100%; padding: 6px 10px; border: 1px solid #c9d8d4; border-radius: 5px; color: var(--primary-deep); background: var(--surface-soft); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .88em; overflow-wrap: anywhere; }
.guide-content blockquote { margin: 24px 0; padding: 18px 22px; border-inline-start: 4px solid var(--accent); border-radius: 6px; color: var(--ink); background: var(--accent-soft); font-weight: 750; }
.guide-content h2, .guide-content h3, .guide-content p, .guide-content li, .faq-list summary, .faq-answer { overflow-wrap: anywhere; }

.faq-section { padding: 90px 0 110px; border-block-start: 1px solid var(--line); background: #eef3f1; }
.section-heading { max-width: 760px; margin-block-end: 48px; }
.section-heading h2 { margin: 0; font-size: clamp(2.2rem, 4vw, 3.8rem); line-height: 1.08; letter-spacing: -.03em; }
.section-heading > p:last-child { color: var(--ink-muted); font-size: 1.05rem; }
.faq-group { margin-block-start: 54px; }
.faq-group > h2 { margin: 0 0 18px; color: var(--primary); font-size: clamp(1.45rem, 2.5vw, 2rem); }
.faq-list { border-block-start: 1px solid #cbd8d4; }
.faq-list details { border-block-end: 1px solid #cbd8d4; background: rgba(255,255,255,.44); }
.faq-list details[open] { background: var(--white); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 20px 22px; cursor: pointer; list-style: none; color: var(--ink); font-weight: 850; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-plus { flex: 0 0 auto; color: var(--accent); font-size: 1.65rem; font-weight: 400; transition: transform .2s ease; }
.faq-list details[open] .faq-plus { transform: rotate(45deg); }
.faq-answer { padding: 0 22px 22px; color: var(--ink-muted); }
.faq-answer p { max-width: 900px; margin: 0; }

.final-cta { color: var(--white); background: var(--primary-deep); }
.final-cta-inner { min-height: 260px; display: flex; align-items: center; justify-content: space-between; gap: 36px; padding-block: 60px; }
.final-cta h2 { max-width: 760px; margin: 0; font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.1; }
.button-light { color: var(--primary-deep); border-color: var(--white); background: var(--white); }
.site-footer { padding: 50px 0; color: var(--ink-muted); background: var(--white); }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 38px; align-items: end; }
.site-footer img { width: min(260px, 70vw); }
.site-footer p { margin: 10px 0 0; }
.footer-contact { text-align: end; }
.footer-contact a { color: var(--primary); font-weight: 800; }

@media (max-width: 940px) {
  .header-actions .quiet-link { display: none; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-card { display: none; }
  .guide-layout { grid-template-columns: 1fr; gap: 22px; }
  .toc-card { position: static; }
  .toc-card nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 680px) {
  .guide-shell { width: min(100% - 24px, 1180px); }
  .header-inner { min-height: 68px; }
  .header-actions { gap: 7px; }
  .header-actions > .button { display: none; }
  .brand img { width: min(190px, 50vw); }
  .language-menu { min-width: 0; }
  .language-menu summary { max-width: 39vw; overflow: hidden; text-overflow: ellipsis; }
  .hero { padding-block: 58px; }
  .hero h1 { font-size: clamp(2.18rem, 12vw, 3.6rem); }
  .guide-layout { padding-block: 34px 60px; }
  .toc-card nav { grid-template-columns: 1fr; }
  .guide-content { padding: 25px 20px 36px; border-radius: 8px; }
  .guide-content h2 { margin-block-start: 58px; }
  .faq-section { padding-block: 64px 80px; }
  .faq-list summary { padding: 17px 14px; }
  .faq-answer { padding: 0 14px 18px; }
  .final-cta-inner { min-height: 0; display: grid; padding-block: 48px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-contact { text-align: start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}