/* ═══════════════ Drifting Clouds — shared styles ═══════════════ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #ffffff;
  --bg-soft: #f4f5f7;
  --ink: #1a1c20;
  --ink-soft: #5c616b;
  --ink-muted: #9aa0aa;
  --line: #e6e8ec;
  --accent: #3b6fb0;
  --accent-soft: #6f9bd1;
  --radius: 12px;
  --font-display: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --font-body: 'DM Sans', system-ui, -apple-system, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ─── Nav ─── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}
nav.scrolled { border-bottom-color: var(--line); }

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.4rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  gap: 2.4rem;
  list-style: none;
  align-items: center;
}
.nav-links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 400;
  transition: color 0.25s;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.nav-en { font-size: 0.78rem; color: var(--ink-muted); letter-spacing: 0.05em; }

.menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.4rem; }
.menu-toggle span { display: block; width: 22px; height: 1.5px; background: var(--ink); margin: 5px 0; transition: transform 0.3s, opacity 0.3s; }

/* ─── Buttons ─── */
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  background: transparent;
  color: var(--ink);
  padding: 0.75rem 1.8rem;
  border: 1px solid var(--ink);
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: background 0.25s, color 0.25s;
  cursor: pointer;
}
.btn-outline:hover { background: var(--ink); color: #fff; }

.btn-solid {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  background: var(--ink);
  color: #fff;
  padding: 0.75rem 1.8rem;
  border: 1px solid var(--ink);
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: background 0.25s;
  cursor: pointer;
}
.btn-solid:hover { background: #000; }

/* ─── Subpage hero ─── */
.subhero {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--line);
}
.crumb {
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-bottom: 1.4rem;
}
.crumb a { color: var(--ink-soft); text-decoration: none; }
.crumb a:hover { color: var(--ink); }

.subhero-label {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}
.subhero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5vw, 4rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin-bottom: 1.3rem;
  max-width: 760px;
}
.subhero p {
  font-size: 1.15rem;
  color: var(--ink-soft);
  font-weight: 300;
  line-height: 1.75;
  max-width: 620px;
}

/* ─── Content ─── */
.content { padding: 4rem 0 5rem; }

.content-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 4rem;
  align-items: start;
}

.prose h2 {
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 600;
  margin: 2.4rem 0 0.8rem;
  color: var(--ink);
}
.prose h2:first-child { margin-top: 0; }
.prose p {
  font-size: 1rem;
  color: var(--ink-soft);
  font-weight: 300;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.feature-list { list-style: none; display: grid; gap: 1rem; margin: 1rem 0 0; }
.feature-list li {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
  font-size: 0.98rem;
  color: var(--ink-soft);
  line-height: 1.6;
}
.feature-list li svg { flex-shrink: 0; margin-top: 0.2rem; color: var(--accent); }
.feature-list li strong { color: var(--ink); font-weight: 500; }

/* ─── Process steps ─── */
.steps { list-style: none; counter-reset: step; display: grid; gap: 1.5rem; margin-top: 1.2rem; }
.steps li { position: relative; padding-left: 3.4rem; }
.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute; left: 0; top: -0.1rem;
  width: 2.4rem; height: 2.4rem;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-size: 1.15rem; font-weight: 600;
}
.steps li h4 { font-size: 1.04rem; font-weight: 600; color: var(--ink); margin-bottom: 0.2rem; }
.steps li p { font-size: 0.95rem; color: var(--ink-soft); font-weight: 300; margin: 0; line-height: 1.7; }

/* ─── FAQ ─── */
.faq { display: grid; gap: 0.6rem; margin-top: 1.2rem; }
.faq details { border: 1px solid var(--line); border-radius: 10px; padding: 0 1.2rem; }
.faq summary {
  cursor: pointer; padding: 1rem 0; font-weight: 500; color: var(--ink);
  list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--accent); font-size: 1.4rem; line-height: 1; flex-shrink: 0; }
.faq details[open] summary::after { content: '\2212'; }
.faq details p { font-size: 0.95rem; color: var(--ink-soft); font-weight: 300; padding-bottom: 1.1rem; margin: 0; line-height: 1.75; }

/* ─── Aside card ─── */
.aside-card {
  background: var(--bg-soft);
  border-radius: 16px;
  padding: 2.2rem;
  position: sticky;
  top: 6rem;
}
.aside-card h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}
.aside-card p {
  font-size: 0.95rem;
  color: var(--ink-soft);
  font-weight: 300;
  margin-bottom: 1.4rem;
}
.aside-card .meta {
  display: grid;
  gap: 0.5rem;
  margin-top: 1.4rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.aside-card .meta a { color: var(--ink); text-decoration: none; }
.aside-card .meta a:hover { color: var(--accent); }

/* ─── Related services ─── */
.related { background: var(--bg-soft); padding: 4rem 0; }
.related h2 {
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 600;
  margin-bottom: 2rem;
  text-align: center;
}
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.related-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.8rem;
  text-decoration: none;
  transition: border-color 0.25s, transform 0.25s;
  display: block;
}
.related-card:hover { border-color: var(--accent-soft); transform: translateY(-3px); }
.related-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.4rem;
}
.related-card p { font-size: 0.9rem; color: var(--ink-soft); font-weight: 300; }
.related-card.current { border-color: var(--accent); background: #fbfcfe; }

/* ─── Footer ─── */
footer { border-top: 1px solid var(--line); padding: 2.4rem 0; }
.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.footer-left { display: flex; align-items: center; gap: 0.7rem; color: var(--ink-soft); }
.footer-left svg { color: var(--ink); }
.footer-nav { display: flex; gap: 2rem; list-style: none; }
.footer-nav a { font-size: 0.9rem; color: var(--ink-soft); text-decoration: none; transition: color 0.25s; }
.footer-nav a:hover { color: var(--ink); }
.footer-copy { font-size: 0.85rem; color: var(--ink-muted); }

/* ─── Reveal ─── */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ─── Responsive ─── */
@media (max-width: 900px) {
  .content-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .aside-card { position: static; }
  .related-grid { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
}
@media (max-width: 600px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: 1.2rem;
    padding: 1.5rem 2rem 2rem;
  }
  .nav-links.open { display: flex; }
  .menu-toggle { display: block; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}