:root {
  --navy: #061524;
  --navy-2: #0b2740;
  --navy-3: #122f48;
  --gold: #e0a93a;
  --gold-2: #f5c96b;
  --paper: #eef4f7;
  --ink: #112033;
  --muted: #65758a;
  --line: rgba(255, 255, 255, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: #fff;
  background: var(--navy);
  font-family: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", Arial, sans-serif;
  word-break: keep-all;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(18px, 5vw, 72px);
  background: rgba(3, 11, 20, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 900;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  color: #141006;
  background: linear-gradient(135deg, var(--gold-2), var(--gold));
  border-radius: 50%;
  font-weight: 1000;
}

.brand span:last-child {
  display: grid;
  gap: 2px;
  line-height: 1.05;
}

.brand b {
  font-size: 19px;
}

.brand small {
  color: rgba(255, 255, 255, 0.55);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.topbar nav {
  display: flex;
  gap: 26px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 15px;
  font-weight: 900;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 520px);
  gap: clamp(28px, 5vw, 68px);
  align-items: center;
  min-height: 720px;
  padding: clamp(62px, 8vw, 108px) clamp(20px, 6vw, 86px);
  background:
    radial-gradient(circle at 82% 18%, rgba(224, 169, 58, 0.22), transparent 23%),
    linear-gradient(135deg, #030b14 0%, #061524 48%, #0b2740 100%);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--gold-2);
  font-size: 13px;
  font-weight: 1000;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.hero h1,
.section-title h2,
.data-copy h2,
.coach-copy h2,
.apply-copy h2 {
  margin: 0;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 860px;
  font-size: clamp(40px, 5vw, 72px);
  line-height: 1.12;
}

.hero h1 strong {
  color: var(--gold-2);
}

.hero-copy > p:not(.eyebrow) {
  max-width: 760px;
  margin: 26px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: clamp(18px, 2vw, 25px);
  font-weight: 750;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 38px;
}

.primary,
.secondary,
.submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 58px;
  padding: 15px 24px;
  border: 0;
  border-radius: 10px;
  font-size: 18px;
  font-weight: 1000;
  cursor: pointer;
}

.primary,
.submit {
  color: #151006;
  background: linear-gradient(135deg, var(--gold-2), var(--gold));
  box-shadow: 0 22px 44px rgba(224, 169, 58, 0.24);
}

.secondary {
  border: 1px solid rgba(245, 201, 107, 0.64);
}

.hero-card {
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(245, 201, 107, 0.34);
  border-radius: 18px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.3);
}

.hero-card img {
  width: 100%;
  height: 450px;
  object-fit: cover;
  object-position: center 14%;
}

.hero-card div {
  padding: 26px;
}

.hero-card span {
  color: var(--gold-2);
  font-size: 14px;
  font-weight: 1000;
}

.hero-card b {
  display: block;
  margin-top: 8px;
  font-size: 30px;
}

.hero-card p {
  margin: 12px 0 0;
  color: rgba(255, 255, 255, 0.74);
  font-size: 17px;
  font-weight: 750;
  line-height: 1.7;
}

.section {
  padding: clamp(64px, 8vw, 104px) clamp(20px, 6vw, 86px);
}

.section-title {
  max-width: 920px;
  margin: 0 auto 38px;
  text-align: center;
}

.section-title h2,
.data-copy h2,
.coach-copy h2,
.apply-copy h2 {
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.2;
}

.section-title p:not(.eyebrow),
.data-copy p,
.coach-copy p,
.apply-copy p {
  color: rgba(255, 255, 255, 0.74);
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 750;
  line-height: 1.75;
}

.lecture-section {
  background: linear-gradient(180deg, #e6eef3 0%, #f6f8fa 100%);
  color: var(--ink);
}

.lecture-section .section-title p:not(.eyebrow) {
  color: var(--muted);
}

.lecture-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.lecture-grid article {
  min-height: 280px;
  padding: 28px;
  background: #fff;
  border: 1px solid rgba(17, 32, 51, 0.08);
  border-radius: 12px;
  box-shadow: 0 18px 36px rgba(16, 35, 55, 0.08);
}

.lecture-grid span {
  display: inline-grid;
  place-items: center;
  width: 58px;
  height: 44px;
  color: #151006;
  background: var(--gold-2);
  border-radius: 999px;
  font-weight: 1000;
}

.lecture-grid h3 {
  margin: 34px 0 14px;
  font-size: 25px;
}

.lecture-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  font-weight: 750;
  line-height: 1.7;
}

.data-section {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  gap: clamp(28px, 5vw, 68px);
  align-items: center;
  background:
    radial-gradient(circle at 15% 22%, rgba(245, 201, 107, 0.15), transparent 22%),
    linear-gradient(180deg, #071a2b, #09243a);
}

.metric-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.metric-list div {
  min-height: 150px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
}

.metric-list b {
  display: block;
  color: var(--gold-2);
  font-size: 24px;
}

.metric-list span {
  display: block;
  margin-top: 14px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 17px;
  font-weight: 750;
}

.coach-section {
  display: grid;
  grid-template-columns: minmax(280px, 430px) minmax(0, 760px);
  gap: clamp(28px, 5vw, 64px);
  justify-content: center;
  align-items: center;
  background: linear-gradient(180deg, #f7f9fb 0%, #e4edf3 100%);
  color: var(--ink);
}

.coach-image img {
  width: 100%;
  max-height: 560px;
  object-fit: cover;
  object-position: center top;
  border-radius: 14px;
  box-shadow: 0 28px 54px rgba(14, 33, 52, 0.18);
}

.coach-copy p {
  color: #435469;
}

.coach-copy ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.coach-copy li {
  padding: 14px 16px;
  color: #17253a;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(17, 32, 51, 0.1);
  border-radius: 10px;
  font-size: 16px;
  font-weight: 900;
}

.apply-section {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(340px, 1fr);
  gap: clamp(28px, 5vw, 62px);
  align-items: start;
  padding: clamp(64px, 8vw, 104px) clamp(20px, 6vw, 86px);
  background: linear-gradient(180deg, #061524 0%, #08233a 100%);
}

.apply-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 15px;
  padding: clamp(22px, 4vw, 34px);
  background: rgba(255, 255, 255, 0.94);
  border-radius: 16px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.28);
}

.apply-form label,
.choice-row span {
  color: #17253a;
  font-size: 15px;
  font-weight: 1000;
}

.apply-form input,
.apply-form select,
.apply-form textarea {
  width: 100%;
  margin-top: 8px;
  padding: 14px;
  color: #17253a;
  background: #fff;
  border: 1px solid #d5dee8;
  border-radius: 8px;
  font: inherit;
  font-size: 16px;
  font-weight: 750;
}

.apply-form textarea {
  resize: vertical;
}

.full {
  grid-column: 1 / -1;
}

.choice-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
}

.choice-row label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  background: #f4f7fa;
  border: 1px solid #d5dee8;
  border-radius: 999px;
}

.choice-row input {
  width: auto;
  margin: 0;
}

.submit {
  width: 100%;
}

.submit:disabled {
  cursor: wait;
  opacity: 0.76;
}

.form-message {
  margin: 0;
  color: #596b7d;
  font-size: 15px;
  font-weight: 800;
  line-height: 1.6;
  text-align: center;
}

.form-message.is-success {
  color: #11684a;
}

footer {
  padding: 28px clamp(20px, 6vw, 86px);
  color: rgba(255, 255, 255, 0.62);
  background: #030b14;
  text-align: center;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.7;
}

@media (max-width: 1020px) {
  .topbar nav {
    display: none;
  }

  .hero,
  .data-section,
  .coach-section,
  .apply-section {
    grid-template-columns: 1fr;
  }

  .lecture-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-card {
    max-width: 620px;
  }
}

@media (max-width: 640px) {
  .topbar {
    padding: 14px 18px;
  }

  .brand b {
    font-size: 17px;
  }

  .brand small {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 46px;
  }

  .hero h1 {
    font-size: clamp(34px, 10.8vw, 48px);
  }

  .hero-copy > p:not(.eyebrow) {
    font-size: 17px;
  }

  .hero-actions {
    display: grid;
  }

  .primary,
  .secondary,
  .submit {
    width: 100%;
    font-size: 17px;
  }

  .hero-card img {
    height: 340px;
  }

  .section-title {
    text-align: left;
  }

  .lecture-grid,
  .metric-list,
  .coach-copy ul,
  .apply-form {
    grid-template-columns: 1fr;
  }

  .lecture-grid article {
    min-height: auto;
  }

  .choice-row {
    display: grid;
  }
}