:root { color-scheme: light; --ink: #181818; --yellow: #ffdc36; --red: #db1e32; --ivory: #f5f3ee; --muted: #64635f; }
* { box-sizing: border-box; }
html { background: #111; scroll-behavior: smooth; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif; font-size: 19px; line-height: 1.65; letter-spacing: -.035em; color: var(--ink); word-break: keep-all; overflow-wrap: anywhere; }
main { width: min(100%, 860px); margin-inline: auto; background: var(--ink); }
h1,h2,h3,p,ul,ol,figure,dl,dd { margin: 0; }
h1,h2,h3 { line-height: 1.35; letter-spacing: -.055em; text-wrap: balance; }
h1 { font-size: clamp(30px, 5.2vw, 52px); font-weight: 850; }
h2 { font-size: clamp(29px, 4.8vw, 46px); font-weight: 800; }
h3 { font-size: 24px; font-weight: 750; }
ul,ol { padding: 0; list-style: none; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
.section-pad { padding: 88px 68px; }
.light { background: #fff; }
.ivory { background: var(--ivory); }
.dark { color: #fff; background: var(--ink); }
.yellow { color: var(--yellow); }
.red { color: var(--red); }
.eyebrow { font-size: 15px; font-weight: 750; letter-spacing: -.025em; margin-bottom: 25px; }
.lead { font-size: 21px; margin-top: 26px; }
.section-note { margin-top: 40px; color: var(--muted); font-size: 18px; }
.dark .section-note { color: #c7c7c2; }
.dark .section-note.yellow { color: var(--yellow); }
.event-info { font-weight: 650; font-size: 19px; line-height: 1.7; }
.hero { color: #fff; text-align: center; background: #080808; }
.hero-intro { padding-bottom: 0; position: relative; z-index: 1; }
.hero-intro .eyebrow { margin-bottom: 38px; }
.hero .lead { color: #e3e3e0; }
.task-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 9px; margin: 35px auto 0; max-width: 580px; }
.task-tags li { font-size: 16px; line-height: 1.4; padding: 9px 16px; border: 1px solid #5a5542; border-radius: 5px; background: #141410; color: var(--yellow); font-weight: 650; }
.hero-visual { position: relative; margin-top: -30px; isolation: isolate; }
.hero-visual img { width: 100%; aspect-ratio: 4 / 5; max-height: 820px; object-fit: cover; object-position: center 44%; }
.hero-video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 44%; opacity: 0; pointer-events: none; }
.hero-visual.video-visible .hero-video { opacity: 1; }
.hero-visual::before,.hero-visual::after { content: ""; position: absolute; z-index: 2; left: 0; right: 0; height: 17%; pointer-events: none; }
.hero-visual::before { top: 0; background: linear-gradient(#080808,transparent); }
.hero-visual::after { bottom: 0; height: 23%; background: linear-gradient(transparent,var(--ink)); }
.hero-outro { padding-top: 48px; background: var(--ink); }
.hero-outro .event-info { margin-top: 30px; }
.profile { display: grid; grid-template-columns: 46% 1fr; align-items: end; gap: 32px; margin-top: 42px; background: #f0f0ed; overflow: hidden; }
.portrait { width: 100%; aspect-ratio: 2 / 3; object-fit: cover; }
.profile-copy { padding: 28px 22px 36px 0; }
.profile-copy .eyebrow { font-size: 13px; margin-bottom: 12px; }
.profile-copy h3 { font-size: 31px; }
.profile-copy > p:last-child { margin-top: 25px; font-size: 17px; }
.credentials { display: grid; grid-template-columns: repeat(3,1fr); margin-top: 30px; padding: 25px 0; border-block: 1px solid #deddd8; }
.credentials > div,.resource-stats > div { display: flex; flex-direction: column-reverse; text-align: center; }
.credentials > div + div { border-left: 1px solid #deddd8; }
.credentials dd { font-size: 35px; line-height: 1.3; font-weight: 800; }
.credentials dt { font-size: 15px; margin-top: 8px; color: var(--muted); }
.special .profile { background: #242424; color: #fff; }
.special .profile-copy { padding-bottom: 32px; }
.speaker-facts { display: grid; gap: 20px; margin-top: 28px; }
.speaker-facts > div { display: flex; flex-direction: column-reverse; }
.speaker-facts dd { font-size: 32px; font-weight: 750; line-height: 1.2; }
.speaker-facts dt { color: #d1d1cf; font-size: 14px; margin-top: 5px; }
.lecture-card { margin-top: 28px; padding: 38px; background: #fff; border: 1px solid #e7e4dd; text-align: center; }
.lecture-card .eyebrow { margin-bottom: 15px; }
.lecture-card h3 { font-size: 34px; }
.special .section-note,.instructor .section-note { text-align: center; }
.problem-list { margin-top: 40px; display: grid; gap: 16px; }
.problem { display: flex; gap: 22px; padding: 28px; background: var(--ivory); border: 1px solid #e8e6df; border-radius: 6px; }
.number { font-size: 18px; font-weight: 750; letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
.problem .number { color: #77766f; padding-top: 4px; }
.problem p { margin-top: 8px; color: var(--muted); font-size: 17px; }
.callout { margin-top: 36px; padding: 28px; background: #292929; color: #fff; text-align: center; font-size: 24px; font-weight: 750; }
.outputs figure { margin-top: 32px; }
.outputs figure img { width: 100%; border-radius: 6px; }
figcaption { margin-top: 12px; font-size: 12px; color: #aaa9a4; text-align: right; }
.output-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; margin-top: 30px; }
.output-card { border: 1px solid #43433d; background: #242423; padding: 26px; border-radius: 6px; }
.output-card h3 { margin-top: 16px; font-size: 22px; }
.output-card p { margin-top: 10px; color: #d1d1cc; font-size: 17px; }
.outputs .section-note { text-align: center; font-weight: 700; }
.time { display: inline-block; margin-left: 18px; padding-left: 18px; border-left: 1px solid #b6b3aa; }
.lesson-list { margin-top: 40px; }
.lesson-list li { display: grid; grid-template-columns: 86px 1fr; gap: 22px; padding: 28px 0; border-bottom: 1px solid #d9d7d0; }
.lesson-list li:first-child { border-top: 1px solid #d9d7d0; }
.lesson-label { align-self: start; background: #262626; color: #fff; border-radius: 4px; text-align: center; font-size: 15px; padding: 6px; font-weight: 650; }
.lesson-list h3 { font-size: 23px; }
.lesson-list p { margin-top: 8px; color: var(--muted); font-size: 17px; }
.resources { background: var(--yellow); text-align: center; }
.resource-stats { display: grid; grid-template-columns: repeat(3,1fr); margin-top: 42px; }
.resource-stats > div + div { border-left: 1px solid rgb(0 0 0 / 22%); }
.resource-stats dd { font-size: 58px; line-height: 1.15; font-weight: 850; font-variant-numeric: tabular-nums; }
.resource-stats dt { font-size: 18px; font-weight: 650; margin-top: 16px; }
.unit { font-size: 20px; margin-left: 3px; }
.resources .section-note { color: #454025; }
.support .lead { font-size: 19px; color: #d1d1cc; }
.week-track { position: relative; display: flex; justify-content: space-between; margin: 46px 0; isolation: isolate; }
.week-line { position: absolute; top: 50%; height: 2px; background: var(--yellow); left: 10px; right: 10px; z-index: -1; transform-origin: left center; }
.week-track > span { display: grid; place-items: center; border: 1px solid #5d5840; background: #22221f; color: var(--yellow); width: 48px; height: 48px; border-radius: 50%; font-size: 14px; font-weight: 750; }
.support-list { display: grid; gap: 18px; }
.support-list article { display: flex; gap: 18px; padding: 28px; background: #272726; border: 1px solid #44433d; border-radius: 6px; }
.benefit-icon { font-size: 25px; line-height: 1.4; }
.support-list h3 { font-size: 23px; }
.support-list p { margin-top: 12px; font-size: 18px; color: #d1d1cc; }
.check-list { display: grid; gap: 20px; margin-top: 36px; }
.check-list li { position: relative; padding-left: 30px; }
.check-list li::before { content: "✓"; position: absolute; left: 0; font-weight: 800; }
.packing { margin-top: 48px; padding: 36px; background: #fff; border: 1px solid #dfdcd4; }
.packing h3 { font-size: 30px; }
.packing .check-list { font-size: 18px; gap: 16px; margin-top: 25px; }
.prepare .section-note { font-size: 16px; }
.faq-list { margin-top: 38px; }
details { padding: 26px 0; border-bottom: 1px solid #d9d7d0; }
details:first-child { border-top: 1px solid #d9d7d0; }
summary { cursor: pointer; font-size: 21px; font-weight: 750; list-style: none; padding-right: 32px; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 2px; top: 0; font-size: 25px; line-height: 1.3; font-weight: 400; }
details[open] > summary::after { content: "−"; }
details p { padding-top: 16px; color: var(--muted); font-size: 17px; }
.apply-section { text-align: center; }
.apply-section h2 { font-size: clamp(28px,4.6vw,42px); }
.class-name { margin-top: 32px; font-size: 30px; line-height: 1.5; font-weight: 750; }
.apply-section .event-info { margin-top: 32px; margin-bottom: 24px; font-weight: 400; }
.apply-note { margin-top: 28px; font-size: 16px; color: #d8c986; }
.apply-link { display: flex; align-items: center; justify-content: center; gap: 16px; margin-top: 28px; padding: 20px 18px; min-height: 58px; background: var(--red); color: #fff; border-radius: 6px; font-weight: 750; font-size: 21px; line-height: 1.5; text-decoration: none; transition: transform .2s, background .2s; }
.apply-link:hover { transform: translateY(-3px); background: #bf1628; }
.apply-link:active { transform: translateY(0); }
:focus-visible { outline: 3px solid #9b6300; outline-offset: 5px; }
.dark :focus-visible { outline-color: var(--yellow); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: fixed; z-index: 10; top: 12px; left: 12px; transform: translateY(-200%); padding: 14px 20px; background: var(--yellow); color: #111; border-radius: 4px; font-weight: 700; }
.skip-link:focus { transform: translateY(0); }
@media (max-width: 600px) {
  body { font-size: 17px; }
  .section-pad { padding: 58px 28px; }
  .eyebrow { font-size: 12px; margin-bottom: 23px; }
  .lead { font-size: 17px; margin-top: 22px; }
  .hero-intro { padding-top: 44px; padding-bottom: 0; }
  .hero-intro .eyebrow { font-size: 11px; margin-bottom: 28px; }
  .hero-intro .lead { font-size: 15px; }
  .task-tags { gap: 7px; margin-top: 28px; }
  .task-tags li { font-size: 12px; padding: 7px 10px; }
  .hero-visual { margin-top: -10px; }
  .hero-visual img { max-height: 540px; }
  .hero-outro { padding-top: 24px; }
  .event-info { font-size: 16px; }
  .profile { grid-template-columns: 44% 1fr; gap: 18px; margin-top: 30px; align-items: center; }
  .profile-copy { padding: 20px 12px 20px 0; }
  .profile-copy .eyebrow { font-size: 11px; margin-bottom: 8px; }
  .profile-copy h3 { font-size: 22px; }
  .profile-copy > p:last-child { margin-top: 12px; font-size: 13px; }
  .portrait { height: 100%; min-height: 245px; }
  .credentials { margin-top: 24px; padding: 20px 0; }
  .credentials dd { font-size: 28px; }
  .credentials dt { font-size: 12px; }
  .section-note { font-size: 15px; margin-top: 28px; }
  .special .profile-copy { padding-bottom: 20px; }
  .speaker-facts { gap: 16px; margin-top: 20px; }
  .speaker-facts dd { font-size: 26px; }
  .speaker-facts dt { font-size: 11px; }
  .lecture-card { padding: 28px 20px; }
  .lecture-card h3 { font-size: 27px; }
  .problem-list { margin-top: 28px; gap: 12px; }
  .problem { padding: 22px 18px; gap: 14px; }
  .problem h3 { font-size: 19px; }
  .problem p { font-size: 15px; }
  .number { font-size: 15px; }
  .callout { font-size: 19px; padding: 24px 16px; }
  .output-grid { gap: 12px; margin-top: 22px; }
  .output-card { padding: 21px 16px; }
  .output-card h3 { font-size: 18px; margin-top: 12px; }
  .output-card p { font-size: 14px; }
  .lesson-list { margin-top: 30px; }
  .lesson-list li { grid-template-columns: 62px 1fr; gap: 16px; padding: 24px 0; }
  .lesson-label { font-size: 12px; padding: 5px; }
  .lesson-list h3 { font-size: 19px; }
  .lesson-list p { font-size: 15px; }
  .resource-stats { margin-top: 32px; }
  .resource-stats dd { font-size: 41px; }
  .resource-stats dt { font-size: 14px; margin-top: 12px; }
  .unit { font-size: 15px; }
  .support .lead { font-size: 16px; }
  .support-list article { padding: 22px 18px; gap: 12px; }
  .support-list h3 { font-size: 19px; }
  .support-list p { font-size: 15px; }
  .benefit-icon { font-size: 21px; }
  .week-track { margin-block: 32px; }
  .check-list { gap: 18px; margin-top: 28px; font-size: 16px; }
  .packing { padding: 26px 22px; margin-top: 36px; }
  .packing h3 { font-size: 25px; }
  .packing .check-list { font-size: 15px; }
  .prepare .section-note { font-size: 14px; }
  .faq-list { margin-top: 28px; }
  summary { font-size: 18px; }
  details p { font-size: 15px; }
  .class-name { font-size: 24px; }
  .apply-note { font-size: 14px; }
  .apply-link { font-size: 17px; padding: 17px 12px; }
}
@media (max-width: 360px) {
  .section-pad { padding-inline: 20px; }
  h1 { font-size: 28px; }
  h2 { font-size: 27px; }
  .resource-stats dd { font-size: 35px; }
  .output-grid { grid-template-columns: 1fr; }
  .profile { gap: 12px; }
  .profile-copy h3 { font-size: 20px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .apply-link { transition: none; }
  .apply-link:hover { transform: none; }
}