:root {
  --navy-950: #0b1f3a;
  --navy-900: #102a4d;
  --navy-800: #173564;
  --navy-700: #21487f;
  --gold: #c59a33;
  --gold-text: #8f6814;
  --gold-soft: #ead9ad;
  --ink: #172235;
  --muted: #657085;
  --line: #dfe4ec;
  --paper: #f5f7fa;
  --white: #ffffff;
  --shadow: 0 22px 70px rgba(11, 31, 58, .12);
  --radius-lg: 28px;
  --radius-md: 18px;
  --container: min(1180px, calc(100% - 40px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Pretendard, "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", Arial, sans-serif;
  line-height: 1.7;
  word-break: keep-all;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea { font: inherit; }
ul, ol { margin: 0; padding: 0; }
li { list-style: none; }

.container { width: var(--container); margin: 0 auto; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; left: 16px; top: -60px; z-index: 9999;
  background: var(--white); padding: 10px 16px; border-radius: 8px;
}
.skip-link:focus { top: 16px; }

.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255, 255, 255, .9);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(223, 228, 236, .9);
}
.nav-wrap {
  height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 30px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; }

.primary-nav { display: flex; align-items: center; gap: 28px; font-size: 14px; font-weight: 650; }
.primary-nav a { position: relative; }
.primary-nav a:not(.nav-cta)::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -7px; height: 2px;
  background: var(--gold); transition: right .25s ease;
}
.primary-nav a:hover::after, .primary-nav a.active::after { right: 0; }
.nav-cta {
  padding: 11px 18px; border-radius: 999px; background: var(--navy-800); color: var(--white);
}
.menu-button { display: none; background: transparent; border: 0; padding: 8px; }
.menu-button span:not(.sr-only) {
  display: block; width: 25px; height: 2px; margin: 5px 0; background: var(--navy-900);
}

.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(circle at 84% 12%, rgba(197,154,51,.15), transparent 28%),
    linear-gradient(180deg, #f8fafc 0%, #fff 100%);
  padding: 92px 0 0;
}
.hero::before {
  content: ""; position: absolute; width: 520px; height: 520px; border-radius: 50%;
  border: 1px solid rgba(23, 53, 100, .08); right: -170px; top: -140px;
}
.hero-grid { display: grid; grid-template-columns: 1.12fr .88fr; gap: 70px; align-items: center; }
.eyebrow {
  margin: 0 0 16px; color: var(--gold); font-weight: 800; font-size: 12px;
  letter-spacing: .16em; text-transform: uppercase;
}
.hero h1 {
  margin: 0; color: var(--navy-950); font-size: clamp(42px, 6vw, 72px);
  line-height: 1.16; letter-spacing: -.055em;
}
.hero h1 span { color: var(--navy-700); }
.hero-lead { max-width: 690px; margin: 28px 0 0; color: var(--muted); font-size: 18px; }
.hero-actions { display: flex; gap: 12px; margin-top: 34px; }
.button {
  min-height: 52px; padding: 0 24px; border-radius: 999px;
  display: inline-flex; align-items: center; justify-content: center; font-weight: 750;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button.primary { color: var(--white); background: var(--navy-800); box-shadow: 0 14px 30px rgba(23,53,100,.22); }
.button.secondary { color: var(--navy-800); background: var(--white); border: 1px solid var(--line); }
.trust-row { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-top: 30px; color: var(--muted); font-size: 13px; }
.trust-row span::before { content: "✓"; margin-right: 7px; color: var(--gold); font-weight: 800; }

.hero-card {
  position: relative;
  min-height: 410px;
  padding: 40px;
  display: flex;
  align-items: center;
  border-radius: 34px;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: linear-gradient(145deg, var(--navy-800), var(--navy-950));
  color: var(--white);
}
.hero-card::after {
  content: ""; position: absolute; width: 260px; height: 260px; right: -70px; bottom: -80px;
  border-radius: 50%; background: rgba(197,154,51,.15);
}
.profile-summary { position: relative; z-index: 2; width: 100%; padding: 0 4px; }
.profile-label { margin: 0 0 4px; color: var(--gold-soft); font-size: 13px; font-weight: 750; }
.profile-summary h2 { margin: 0; font-size: 25px; line-height: 1.38; letter-spacing: -.03em; }
.profile-summary ul { margin-top: 18px; display: grid; gap: 5px; color: rgba(255,255,255,.75); font-size: 13px; }
.profile-summary li::before { content: "—"; color: var(--gold); margin-right: 8px; }

.metric-grid {
  position: relative; z-index: 3; display: grid; grid-template-columns: repeat(4, 1fr);
  margin-top: 76px; border: 1px solid var(--line); border-bottom: 0;
  background: var(--white); border-radius: 22px 22px 0 0; overflow: hidden;
}
.metric-grid article { padding: 28px 30px; border-right: 1px solid var(--line); }
.metric-grid article:last-child { border-right: 0; }
.metric-grid strong { display: block; color: var(--navy-800); font-size: 35px; line-height: 1.2; letter-spacing: -.04em; }
.metric-grid strong span { font-size: .55em; margin-left: 3px; }
.metric-grid p { margin: 7px 0 0; color: var(--muted); font-size: 13px; }
.metric-grid .metric-accent { background: var(--navy-800); }
.metric-grid .metric-accent strong { color: var(--gold-soft); }
.metric-grid .metric-accent p { color: rgba(255,255,255,.65); }

.section { padding: 120px 0; }
.section-heading { max-width: 680px; margin-bottom: 50px; }
.section-heading h2 {
  margin: 0; color: var(--navy-950); font-size: clamp(34px, 4.5vw, 52px);
  line-height: 1.25; letter-spacing: -.045em;
}
.section-heading > p:last-child:not(.eyebrow) { color: var(--muted); margin: 18px 0 0; font-size: 16px; }

.split-layout { display: grid; grid-template-columns: .82fr 1.18fr; gap: 90px; }
.sticky-heading { align-self: start; position: sticky; top: 120px; margin-bottom: 0; }
.intro-text { margin: 0 0 34px; color: var(--navy-800); font-size: 23px; font-weight: 700; line-height: 1.55; }
.principle-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.principle-grid article {
  min-height: 210px; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius-md);
  background: var(--white); transition: transform .2s ease, box-shadow .2s ease;
}
.principle-grid article:hover { transform: translateY(-4px); box-shadow: 0 18px 40px rgba(11,31,58,.08); }
.principle-grid span { color: var(--gold); font-weight: 850; font-size: 12px; letter-spacing: .1em; }
.principle-grid h3 { margin: 24px 0 10px; color: var(--navy-900); font-size: 21px; }
.principle-grid p { margin: 0; color: var(--muted); font-size: 14px; }

.services { background: var(--paper); }
.service-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.service-card {
  position: relative; min-height: 310px; padding: 34px; border-radius: var(--radius-lg);
  background: var(--white); border: 1px solid rgba(223,228,236,.9); overflow: hidden;
}
.service-card::after {
  content: ""; position: absolute; width: 110px; height: 110px; border-radius: 50%;
  background: rgba(197,154,51,.08); right: -35px; bottom: -35px;
}
.service-number { color: var(--gold); font-weight: 850; font-size: 13px; letter-spacing: .14em; }
.service-card h3 { margin: 24px 0 10px; color: var(--navy-900); font-size: 26px; }
.service-card > p { max-width: 520px; margin: 0; color: var(--muted); }
.service-card ul { margin-top: 24px; display: flex; flex-wrap: wrap; gap: 8px; }
.service-card li {
  padding: 7px 12px; border-radius: 999px; background: var(--paper);
  color: var(--navy-700); font-size: 12px; font-weight: 700;
}

.results { color: var(--white); background: var(--navy-950); }
.section-heading.light h2 { color: var(--white); }
.result-layout { display: grid; grid-template-columns: .82fr 1.18fr; gap: 65px; align-items: start; }
.institution-list { display: flex; flex-wrap: wrap; gap: 10px; }
.institution-list span {
  padding: 10px 13px; border: 1px solid rgba(255,255,255,.14); border-radius: 999px;
  color: rgba(255,255,255,.72); font-size: 12px;
}
.result-cards { display: grid; gap: 14px; }
.result-cards article {
  padding: 26px 28px; border-radius: 18px;
  background: linear-gradient(120deg, rgba(255,255,255,.08), rgba(255,255,255,.035));
  border: 1px solid rgba(255,255,255,.08);
}
.result-cards article > p { margin: 0; color: var(--gold-soft); font-size: 12px; font-weight: 750; }
.result-cards h3 { margin: 8px 0 5px; font-size: 21px; }
.result-cards span { color: rgba(255,255,255,.62); font-size: 13px; }

.lecture-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 28px; }
.featured-lecture {
  min-height: 490px; padding: 38px; border-radius: var(--radius-lg);
  color: var(--white); background:
    radial-gradient(circle at 80% 15%, rgba(197,154,51,.25), transparent 28%),
    var(--navy-800);
  display: flex; flex-direction: column; justify-content: space-between;
}
.lecture-label { margin: 0; color: var(--gold-soft); font-size: 13px; font-weight: 750; }
.featured-lecture h3 { margin: 12px 0 0; font-size: 30px; line-height: 1.42; }
.featured-lecture ul { display: grid; gap: 11px; }
.featured-lecture li { color: rgba(255,255,255,.78); font-size: 14px; }
.featured-lecture li::before { content: "✓"; margin-right: 10px; color: var(--gold-soft); font-weight: 850; }
.lecture-history { display: grid; border-top: 1px solid var(--line); }
.lecture-history article {
  display: grid; grid-template-columns: 95px 1fr; gap: 20px; padding: 24px 0;
  border-bottom: 1px solid var(--line);
}
.lecture-history > article > span { color: var(--gold); font-size: 12px; font-weight: 850; }
.lecture-history h3 { margin: 0; color: var(--navy-900); font-size: 18px; }
.lecture-history p { margin: 5px 0 0; color: var(--muted); font-size: 13px; }

.career { background: var(--paper); }
.career-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 55px; }
.subheading { margin: 0 0 24px; color: var(--navy-900); font-size: 22px; }
.timeline { display: grid; gap: 16px; }
.timeline li {
  position: relative; display: grid; grid-template-columns: 145px 1fr; gap: 22px;
  padding: 20px 22px; border-radius: 16px; background: var(--white); border: 1px solid var(--line);
}
.timeline li > span { color: var(--gold); font-size: 12px; font-weight: 800; }
.timeline strong { color: var(--navy-900); }
.timeline p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.education-card { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); }
.education-card article { display: grid; grid-template-columns: 75px 1fr; gap: 18px; padding: 20px 22px; border-bottom: 1px solid var(--line); }
.education-card article:last-child { border-bottom: 0; }
.education-card span { color: var(--gold); font-size: 12px; font-weight: 850; }
.education-card p { margin: 0; color: var(--muted); font-size: 13px; }
.education-card strong { color: var(--navy-900); }
.paper-card {
  margin-top: 18px; padding: 26px; border-radius: var(--radius-md);
  background: var(--navy-900); color: var(--white);
}
.paper-card > p { margin: 0; color: var(--gold-soft); font-size: 12px; }
.paper-card h3 { margin: 7px 0 13px; font-size: 21px; }
.paper-card blockquote { margin: 0; color: rgba(255,255,255,.67); font-size: 13px; font-style: italic; }

.contact { background: var(--white); }
.contact-card {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 70px; align-items: center;
  padding: 70px; border-radius: 36px; background:
    radial-gradient(circle at 90% 10%, rgba(197,154,51,.19), transparent 27%),
    var(--navy-950); color: var(--white);
}
.contact-card h2 { margin: 0; font-size: clamp(36px, 4.2vw, 52px); line-height: 1.25; letter-spacing: -.045em; }
.contact-card > div:first-child > p:last-child { margin: 22px 0 0; color: rgba(255,255,255,.65); }
.contact-actions { display: grid; gap: 12px; }
.contact-actions a {
  padding: 18px 20px; border-radius: 15px; border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.06); display: flex; justify-content: space-between; gap: 20px;
  transition: background .2s ease, transform .2s ease;
}
.contact-actions a:hover { background: rgba(255,255,255,.12); transform: translateX(4px); }
.contact-actions span { color: rgba(255,255,255,.55); font-size: 12px; }
.contact-actions strong { font-size: 14px; text-align: right; }
.contact-actions .contact-download { border-color: rgba(234,217,173,.28); }
.contact-actions .contact-download strong { color: var(--gold-soft); }

.site-footer { padding: 34px 0; border-top: 1px solid var(--line); }
.footer-wrap { display: flex; align-items: center; justify-content: space-between; gap: 24px; color: var(--muted); font-size: 12px; }
.footer-wrap strong { color: var(--navy-900); }
.footer-wrap p { margin: 2px 0 0; }
.footer-wrap > a { color: var(--navy-800); font-weight: 750; }

@media (max-width: 980px) {
  .primary-nav {
    position: fixed; inset: 78px 0 auto 0; display: none; padding: 18px 20px 26px;
    background: var(--white); border-bottom: 1px solid var(--line); box-shadow: 0 18px 38px rgba(11,31,58,.08);
  }
  .primary-nav.open { display: grid; gap: 8px; }
  .primary-nav a { padding: 10px 4px; }
  .nav-cta { text-align: center; margin-top: 8px; }
  .menu-button { display: block; }
  .hero { padding-top: 65px; }
  .hero-grid, .split-layout, .result-layout, .lecture-grid, .career-grid, .contact-card { grid-template-columns: 1fr; }
  .hero-grid { gap: 42px; }
  .hero-card { min-height: auto; }
  .metric-grid { grid-template-columns: repeat(2, 1fr); }
  .metric-grid article:nth-child(2) { border-right: 0; }
  .metric-grid article:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .sticky-heading { position: static; }
  .result-layout { gap: 35px; }
  .featured-lecture { min-height: 420px; }
  .contact-card { padding: 50px; gap: 38px; }
}

@media (max-width: 680px) {
  :root { --container: min(100% - 28px, 1180px); }
  .nav-wrap { height: 68px; }
  .primary-nav { inset: 68px 0 auto 0; }
  .brand-text small { display: none; }
  .hero { padding-top: 50px; }
  .hero h1 { font-size: 41px; }
  .hero-lead { font-size: 16px; }
  .hero-actions { flex-direction: column; }
  .button { width: 100%; }
  .hero-card { padding: 22px; border-radius: 26px; }
  .portrait { height: 205px; }
  .portrait-ring { width: 145px; height: 145px; }
  .portrait-monogram { font-size: 58px; }
  .metric-grid { margin-top: 45px; }
  .metric-grid article { padding: 22px 18px; }
  .metric-grid strong { font-size: 27px; }
  .section { padding: 82px 0; }
  .section-heading { margin-bottom: 34px; }
  .section-heading h2 { font-size: 34px; }
  .principle-grid, .service-grid { grid-template-columns: 1fr; }
  .principle-grid article, .service-card { min-height: auto; }
  .service-card { padding: 28px; }
  .lecture-history article { grid-template-columns: 75px 1fr; }
  .timeline li { grid-template-columns: 1fr; gap: 6px; }
  .contact-card { padding: 34px 24px; border-radius: 26px; }
  .contact-card h2 { font-size: 34px; }
  .contact-actions a { align-items: flex-start; flex-direction: column; gap: 5px; }
  .contact-actions strong { text-align: left; }
  .footer-wrap { align-items: flex-start; flex-direction: column; }
}


.back-to-top {
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--navy-800);
  font: inherit;
  font-weight: 750;
  cursor: pointer;
}
.back-to-top:hover {
  color: var(--gold);
}
.back-to-top:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 5px;
  border-radius: 4px;
}

.credential-card {
  overflow: hidden;
  margin-bottom: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--white);
}
.credential-card article {
  display: grid;
  grid-template-columns: 75px 1fr;
  gap: 18px;
  padding: 21px 22px;
  border-bottom: 1px solid var(--line);
}
.credential-card article:last-child {
  border-bottom: 0;
}
.credential-card span {
  color: var(--gold);
  font-size: 12px;
  font-weight: 850;
}
.credential-card strong {
  color: var(--navy-900);
}
.credential-card p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}
.education-heading {
  margin-top: 34px;
}

@media (min-width: 1100px) {
  .service-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}


/* Brand symbol */
.brand-logo-only { min-width: 64px; gap: 0; }
.brand-symbol-image {
  width: 64px;
  height: 64px;
  display: block;
  object-fit: contain;
}
.footer-brand p { margin: 5px 0 0; }
.footer-symbol {
  width: 68px;
  height: auto;
  display: block;
  object-fit: contain;
}

/* Representative cases */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.case-grid article {
  min-height: 285px;
  padding: 30px;
  border: 1px solid rgba(255,255,255,.10);
  border-radius: 22px;
  background: linear-gradient(145deg, rgba(255,255,255,.10), rgba(255,255,255,.035));
}
.case-label {
  margin: 0;
  color: var(--gold-soft);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .04em;
}
.case-grid h3 {
  margin: 20px 0 12px;
  font-size: 24px;
  line-height: 1.35;
}
.case-grid article > p:last-child {
  margin: 0;
  color: rgba(255,255,255,.68);
  font-size: 14px;
}
.result-subheading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  margin: 72px 0 22px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255,255,255,.12);
}
.result-subheading h3 { margin: 0; font-size: 24px; }
.result-subheading p { margin: 0; color: rgba(255,255,255,.55); font-size: 12px; }
.institution-list-wide { margin-bottom: 42px; }
.result-cards-grid { grid-template-columns: repeat(2, 1fr); }

/* Scroll reveal — progressive enhancement */
.motion-ready .reveal-section,
.motion-ready .reveal-item,
.motion-ready .reveal-group > * {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .7s ease, transform .7s ease;
  will-change: opacity, transform;
}
.motion-ready .reveal-section.is-visible,
.motion-ready .reveal-item.is-visible,
.motion-ready .reveal-group > *.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 1100px) {
  .service-grid { grid-template-columns: repeat(3, 1fr); }
  .service-grid .service-card:nth-child(4),
  .service-grid .service-card:nth-child(5) { min-height: 290px; }
}

@media (max-width: 980px) {
  .case-grid { grid-template-columns: 1fr; }
  .case-grid article { min-height: auto; }
  .result-cards-grid { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .brand-logo-only { min-width: 56px; }
  .brand-symbol-image { width: 56px; height: 56px; }
  .footer-symbol { width: 62px; }
  .result-subheading { align-items: flex-start; flex-direction: column; gap: 8px; }
  .case-grid article { padding: 25px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .motion-ready .reveal-section,
  .motion-ready .reveal-item,
  .motion-ready .reveal-group > * {
    opacity: 1;
    transform: none;
    transition: none;
  }
}


@media (max-width: 768px) {
  .hero-card {
    min-height: 0;
    padding: 32px 26px;
  }
}


/* Final readability tuning: darker gold on light backgrounds */
.hero-copy .eyebrow,
.section-heading:not(.light) .eyebrow,
.principle-grid article > span,
.service-number,
.timeline > li > span,
.credential-card span,
.education-card span {
  color: var(--gold-text);
}


/* Keep gold readable on dark backgrounds */
.results .case-label,
.featured-lecture .lecture-label,
.paper-card > p {
  color: var(--gold-soft);
}