:root {
  --color-primary: #0891B2;
  --color-secondary: #22D3EE;
  --color-accent: #059669;
  --color-neutral-dark: #164E63;
  --color-neutral-light: #ECFEFF;
  --font-heading: 'Gowun Batang', serif;
  --font-body: 'Pretendard', 'Noto Sans KR', sans-serif;
  --sidebar-w: 240px;
}

/* === Reset & base === */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-body);
  color: var(--color-neutral-dark);
  background: #fbfeff;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; height: auto; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { font-family: var(--font-heading); color: var(--color-neutral-dark); line-height: 1.2; margin: 0 0 1rem; font-weight: 700; }
h1 { font-size: clamp(2rem, 5vw, 3rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin-top: 0; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1rem; }

/* === Layout with sidebar === */
.layout { display: block; }
.sidebar {
  background: var(--color-neutral-light);
  border-bottom: 1px solid rgba(22,78,99,0.12);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.logo img { height: 72px; width: auto; display: block; }
.sidebar-nav { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; }
.sidebar-nav a {
  color: var(--color-neutral-dark);
  font-weight: 500;
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
}
.sidebar-nav a.is-current { border-bottom-color: var(--color-primary); color: var(--color-primary); }
.sidebar-nav a:hover { color: var(--color-primary); text-decoration: none; }
.sidebar-foot { font-size: 0.85rem; color: rgba(22,78,99,0.65); margin: 0; }
.main { padding: 2rem 1.25rem 3rem; }

@media (min-width: 900px) {
  .layout {
    display: grid;
    grid-template-columns: var(--sidebar-w) 1fr;
    min-height: 100vh;
  }
  .sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    border-right: 1px solid rgba(22,78,99,0.12);
    border-bottom: none;
    padding: 2rem 1.5rem;
    gap: 2rem;
  }
  .logo img { height: 96px; }
  .sidebar-nav { flex-direction: column; gap: 0.25rem; }
  .sidebar-nav a { padding: 0.5rem 0; border-bottom: none; border-left: 3px solid transparent; padding-left: 0.75rem; }
  .sidebar-nav a.is-current { border-left-color: var(--color-primary); background: rgba(8,145,178,0.06); }
  .sidebar-foot { margin-top: auto; }
  .main { padding: 3rem 3rem 4rem; }
}

/* === Hero === */
.hero { padding: 2rem 0 3rem; max-width: 900px; }
.hero .eyebrow { font-size: 0.85rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-primary); margin-bottom: 0.75rem; }
.hero .sub { font-size: 1.15rem; color: rgba(22,78,99,0.8); max-width: 55ch; margin-bottom: 1.5rem; }
.hero-img { width: 100%; margin-top: 2rem; border-radius: 12px; aspect-ratio: 16/9; object-fit: cover; }

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 0.85rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-family: var(--font-body);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-neutral-dark); }
.btn-light { background: #fff; color: var(--color-primary); }

/* === Sections === */
.section { padding: 3rem 0; }
.section.narrow { max-width: 65ch; }
.section-head { margin-bottom: 2rem; }
.section-head p { color: rgba(22,78,99,0.75); max-width: 55ch; }

/* === Grid & cards === */
.grid { display: grid; gap: 1.25rem; }
.grid-2 { grid-template-columns: 1fr; }
@media (min-width: 720px) { .grid-2 { grid-template-columns: 1fr 1fr; } }

.card {
  background: #fff;
  border: 1px solid rgba(22,78,99,0.1);
  border-radius: 12px;
  padding: 1.75rem;
  display: block;
}
.card h3 { color: var(--color-neutral-dark); margin-top: 0.75rem; }
.card p { color: rgba(22,78,99,0.85); margin-bottom: 0; }
.card .icon { color: var(--color-primary); }
.card-link {
  color: inherit;
  transition: transform 0.15s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.card-link:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 12px 30px -18px rgba(22,78,99,0.35);
  border-color: var(--color-secondary);
}

/* === Testimonial === */
.testimonial-section { text-align: center; }
.testimonial-section blockquote {
  margin: 0 auto;
  max-width: 60ch;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  line-height: 1.6;
  color: var(--color-neutral-dark);
}
.testimonial-section blockquote p { margin-bottom: 1rem; }
.testimonial-section cite {
  display: block;
  font-family: var(--font-body);
  font-style: normal;
  font-size: 0.95rem;
  color: rgba(22,78,99,0.7);
}

/* === CTA band === */
.cta-band {
  background: var(--color-primary);
  color: #fff;
  border-radius: 16px;
  padding: 2.5rem 2rem;
  text-align: center;
  margin: 3rem 0;
}
.cta-band h2 { color: #fff; }
.cta-band p { color: rgba(255,255,255,0.9); margin-bottom: 1.5rem; }

/* === Article detail === */
.article {
  max-width: 65ch;
  margin: 0 auto;
  padding: 1rem 0 2rem;
}
.article .eyebrow { font-size: 0.85rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-primary); margin-bottom: 0.75rem; }
.article > header h1 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 1rem; }
.article .lede { font-size: 1.2rem; color: rgba(22,78,99,0.75); margin-bottom: 2rem; }
.article-hero { aspect-ratio: 16/9; object-fit: cover; border-radius: 8px; margin: 2rem 0; width: 100%; }
.article h2 { margin-top: 2.5rem; }
.article p { font-size: 1.1rem; line-height: 1.8; margin-bottom: 1.25rem; }
.back { margin-top: 3rem; }
.back-link { font-weight: 500; }

/* === Contact page === */
.contact-card { background: var(--color-neutral-light); border-radius: 12px; padding: 2rem; }
.contact-form { display: flex; flex-direction: column; gap: 1.25rem; max-width: 600px; }
.contact-form label { display: flex; flex-direction: column; gap: 0.4rem; font-weight: 500; }
.contact-form input, .contact-form textarea {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid rgba(22,78,99,0.2);
  border-radius: 8px;
  background: #fff;
  color: var(--color-neutral-dark);
}
.contact-form input:focus, .contact-form textarea:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}
.form-consent {
  flex-direction: row !important;
  align-items: flex-start;
  gap: 0.6rem !important;
  font-size: 0.9rem;
  font-weight: 400;
  color: rgba(22,78,99,0.85);
  flex-wrap: wrap;
}
.form-consent input { margin-top: 0.2rem; }

/* === FAQ === */
.faq details {
  border-bottom: 1px solid rgba(22,78,99,0.12);
  padding: 1rem 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--color-neutral-dark);
  list-style: none;
  position: relative;
  padding-right: 2rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: '+';
  position: absolute;
  right: 0.25rem;
  top: 0;
  color: var(--color-primary);
  font-size: 1.4rem;
  line-height: 1;
}
.faq details[open] summary::after { content: '−'; }
.faq p { margin-top: 0.75rem; color: rgba(22,78,99,0.85); }

/* === Footer === */
.site-footer {
  border-top: 1px solid rgba(22,78,99,0.12);
  margin-top: 4rem;
  padding-top: 2.5rem;
  padding-bottom: 1.5rem;
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}
.foot-col h3 { font-size: 1rem; font-family: var(--font-body); font-weight: 700; }
.foot-col ul { list-style: none; padding: 0; margin: 0; }
.foot-col li { margin-bottom: 0.35rem; }
.foot-col a { color: var(--color-neutral-dark); }
.foot-brand { font-family: var(--font-heading); font-size: 1.25rem; font-weight: 700; margin-bottom: 0.5rem; }
.legal-links { margin-top: 0.75rem; display: flex; flex-wrap: wrap; gap: 0.75rem; }
.legal-links li { margin: 0; }
.copyright {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(22,78,99,0.08);
  padding-top: 1.25rem;
  font-size: 0.85rem;
  color: rgba(22,78,99,0.65);
  margin: 1rem 0 0;
}
@media (min-width: 720px) {
  .site-footer { grid-template-columns: 1.2fr 1fr 1.3fr; }
}

/* === Cookie banner === */
.cookie-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  display: none;
  z-index: 9999;
  background: var(--color-neutral-dark);
  color: var(--color-neutral-light);
  padding: 1.25rem 1.5rem;
  border-radius: 12px;
  box-shadow: 0 20px 45px -15px rgba(0,0,0,0.4);
  max-width: 640px;
  margin: 0 auto;
}
.cookie-banner.is-visible { display: block; }
.cookie-banner p { margin: 0 0 1rem; font-size: 0.95rem; }
.cookie-banner__actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.cookie-banner button {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.6rem 1rem;
  border: 1px solid rgba(236,254,255,0.3);
  background: transparent;
  color: var(--color-neutral-light);
  border-radius: 6px;
  cursor: pointer;
}
.cookie-banner button[data-cookie-accept] {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  font-weight: 600;
}
.cookie-banner button:hover { background: rgba(236,254,255,0.1); }
.cookie-banner button[data-cookie-accept]:hover { background: #047857; }
.cookie-banner__prefs {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.9rem;
}
.cookie-banner__prefs label { display: flex; align-items: center; gap: 0.5rem; }
.cookie-banner__prefs button {
  align-self: flex-start;
  margin-top: 0.5rem;
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}