:root {
  --ink: #111111;
  --paper: #FFFFFF;
  --accent: #FF5A1F;
  --line: #DDDDDD;
  --max: 760px;
}

* { box-sizing: border-box; }

html { font-display: swap; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Pretendard Variable', 'Pretendard', sans-serif;
  font-weight: 300;
  line-height: 1.85;
  font-size: 16px;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: 'Pretendard Variable', 'Pretendard', sans-serif;
  font-weight: 500;
  color: var(--ink);
  line-height: 1.4;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

a { color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.section-inner {
  max-width: var(--max);
  margin-inline: auto;
  padding: 56px 20px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--paper);
  z-index: 20;
}

.header-inner {
  max-width: 1000px;
  margin-inline: auto;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  position: relative;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.wordmark {
  font-weight: 500;
  color: var(--ink);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
}

.hamburger {
  background: none;
  border: none;
  display: none;
  cursor: pointer;
  padding: 6px;
}

.main-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin: 0;
  padding: 0;
}

.main-nav a {
  text-decoration: none;
  color: var(--ink);
  font-weight: 300;
  font-size: 0.88rem;
}

.main-nav a:hover { color: var(--accent); }

@media (max-width: 720px) {
  .hamburger { display: block; }
  .main-nav {
    display: none;
    width: 100%;
    order: 3;
  }
  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding-top: 10px;
  }
  .main-nav ul li {
    border-top: 1px solid var(--line);
  }
  .main-nav ul li a {
    display: block;
    padding: 12px 4px;
  }
  .main-nav.is-open { display: block; }
}

/* Hero: minimal, left-aligned, generous whitespace, no image */
.hero {
  max-width: 640px;
  margin: 0 auto;
  padding: 100px 20px 80px;
}

.hero-label {
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  color: var(--accent);
  margin: 0 0 20px;
  font-weight: 500;
}

.hero h1 {
  font-size: clamp(1.6rem, 3.4vw, 2.1rem);
  margin: 0 0 24px;
  font-weight: 500;
  border-bottom: 1px solid var(--ink);
  display: inline-block;
  padding-bottom: 14px;
}

.hero-lead {
  margin: 0 0 32px;
  font-size: 1rem;
  font-weight: 300;
  color: #3A3A3A;
  max-width: 520px;
}

/* CTA buttons */
.cta {
  display: inline-block;
  text-decoration: none;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  padding: 12px 26px;
  font-weight: 400;
  font-size: 0.92rem;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.cta:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.cta--alt {
  border-color: var(--accent);
  color: var(--accent);
}

.cta--alt:hover {
  background: var(--accent);
  color: #fff;
}

/* Section numbering */
.content-section { border-top: 1px solid var(--line); }

.section-num {
  display: block;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 14px;
  font-weight: 500;
}

.content-section h2 {
  font-size: 1.25rem;
  margin: 0 0 20px;
  font-weight: 500;
}

/* Factor list (minimal, no table borders) */
.factor-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 22px;
}

.factor-list li {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  display: grid;
  gap: 6px;
}

.factor-title {
  font-weight: 500;
  display: block;
}

.factor-desc {
  display: block;
  color: #4A4A4A;
  font-size: 0.95rem;
  font-weight: 300;
}

/* Checklist */
.checklist {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 14px;
}

.checklist li {
  padding-left: 24px;
  position: relative;
  font-weight: 300;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 1px;
  background: var(--accent);
}

/* FAQ */
.faq-list {
  margin-top: 16px;
  display: grid;
  gap: 0;
}

.faq-list details {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}

.faq-list details:last-child {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--ink);
}

.faq-list p {
  margin: 12px 0 0;
  font-weight: 300;
  color: #4A4A4A;
}

/* Images */
.shot {
  margin-inline: auto;
  max-width: 760px;
  padding: 0 20px;
}

.shot img {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
}

.shot figcaption {
  font-size: 0.85rem;
  color: #777;
  margin-top: 10px;
  text-align: center;
  font-weight: 300;
}

/* CTA block (bottom) */
.cta-block {
  border-top: 1px solid var(--line);
  text-align: left;
}

.cta-heading {
  font-size: 1.3rem;
  margin: 0 0 14px;
  font-weight: 500;
}

.cta-block p { color: #4A4A4A; }

/* Related links */
.related-heading {
  font-size: 1.25rem;
  margin: 0 0 18px;
  font-weight: 500;
}

.related-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0;
}

.related-list a {
  display: block;
  border-top: 1px solid var(--line);
  padding: 16px 0;
  text-decoration: none;
  color: var(--ink);
  font-weight: 300;
}

.related-list li:last-child a {
  border-bottom: 1px solid var(--line);
}

.related-list a:hover { color: var(--accent); }

/* Footer */
footer {
  background: var(--ink);
  color: #DDDDDD;
  margin-top: 24px;
}

footer address {
  font-style: normal;
  line-height: 1.9;
  font-weight: 300;
}

footer small {
  display: block;
  margin-top: 16px;
  opacity: 0.6;
  font-weight: 300;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}