:root {
  --sea-deep: #042f3a;
  --sea: #0a5f6c;
  --sea-mid: #14808f;
  --foam: #dff3f2;
  --mist: #f3f7f8;
  --ink: #102429;
  --ink-soft: #3d555b;
  --coral: #ff6a4a;
  --sun: #ffc857;
  --white: #ffffff;
  --line: rgba(16, 36, 41, 0.12);
  --shadow: 0 24px 60px rgba(4, 47, 58, 0.16);
  --radius: 1.25rem;
  --header-h: 4.5rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font-sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  --font-display: "Sora", "Pretendard Variable", Pretendard, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(20, 128, 143, 0.12), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(255, 106, 74, 0.08), transparent 55%),
    var(--mist);
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

button {
  font: inherit;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 100;
  background: var(--sea-deep);
  color: var(--white);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
}

.skip-link:focus {
  top: 1rem;
}

.container {
  width: min(1120px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.desktop-br {
  display: none;
}

@media (min-width: 768px) {
  .desktop-br {
    display: block;
  }
}

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: var(--header-h);
  transition: background 0.35s var(--ease), backdrop-filter 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(243, 247, 248, 0.88);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--line);
}

.header-inner {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  z-index: 2;
}

.brand-mark {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 1.15rem;
  color: var(--white);
  transition: color 0.3s ease;
}

.brand-sub {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.78);
  transition: color 0.3s ease;
}

.site-header.is-scrolled .brand-mark,
.site-header.menu-open .brand-mark {
  color: var(--sea-deep);
}

.site-header.is-scrolled .brand-sub,
.site-header.menu-open .brand-sub {
  color: var(--ink-soft);
}

.nav {
  display: none;
  gap: 1.5rem;
}

.nav a {
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.88);
  transition: color 0.25s ease, opacity 0.25s ease;
}

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

.site-header.is-scrolled .nav a {
  color: var(--ink-soft);
}

.site-header.is-scrolled .nav a:hover {
  color: var(--sea);
}

.header-cta {
  display: none;
  padding: 0.65rem 1.1rem;
  border-radius: 999px;
  background: var(--coral);
  color: var(--white);
  font-size: 0.88rem;
  font-weight: 600;
  transition: transform 0.25s var(--ease), background 0.25s ease;
}

.header-cta:hover {
  transform: translateY(-1px);
  background: #ff5535;
}

.nav-toggle {
  width: 2.5rem;
  height: 2.5rem;
  border: 0;
  background: transparent;
  display: grid;
  place-content: center;
  gap: 0.4rem;
  cursor: pointer;
  z-index: 2;
}

.nav-toggle span {
  display: block;
  width: 1.35rem;
  height: 2px;
  background: var(--white);
  transition: background 0.25s ease, transform 0.25s var(--ease);
}

.site-header.is-scrolled .nav-toggle span,
.site-header.menu-open .nav-toggle span {
  background: var(--sea-deep);
}

.site-header.menu-open .nav-toggle span:first-child {
  transform: translateY(3px) rotate(45deg);
}

.site-header.menu-open .nav-toggle span:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

.mobile-nav {
  position: fixed;
  inset: 0;
  background: rgba(243, 247, 248, 0.97);
  display: grid;
  align-content: center;
  justify-items: start;
  gap: 1.25rem;
  padding: 6rem 2rem 2rem;
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav a {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--sea-deep);
}

.mobile-cta {
  margin-top: 0.5rem;
  padding: 0.85rem 1.25rem;
  border-radius: 999px;
  background: var(--coral);
  color: var(--white) !important;
}

@media (min-width: 900px) {
  .nav,
  .header-cta {
    display: flex;
  }

  .nav-toggle,
  .mobile-nav {
    display: none !important;
  }
}

/* Hero */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  overflow: hidden;
  color: var(--white);
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.06);
  animation: hero-ken 18s ease-in-out infinite alternate;
}

@keyframes hero-ken {
  from {
    transform: scale(1.06) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.12) translate3d(-1.5%, -1%, 0);
  }
}

.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(4, 47, 58, 0.55) 0%, rgba(4, 47, 58, 0.28) 38%, rgba(4, 47, 58, 0.78) 100%),
    linear-gradient(90deg, rgba(4, 47, 58, 0.55) 0%, transparent 55%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 2.5rem));
  margin: 0 auto 5.5rem;
  padding-top: calc(var(--header-h) + 3rem);
}

.hero-brand {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 1.4vw, 1.1rem);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sun);
}

.hero-title {
  margin: 0;
  font-size: clamp(2.35rem, 7vw, 4.6rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  font-weight: 700;
}

.hero-title em {
  font-style: normal;
  color: var(--sun);
}

.hero-lead {
  margin: 1.25rem 0 0;
  max-width: 36rem;
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: rgba(255, 255, 255, 0.9);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.8rem 1.35rem;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.25s var(--ease), background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--coral);
  color: var(--white);
}

.btn-primary:hover {
  background: #ff5535;
}

.btn-ghost {
  border: 1px solid rgba(255, 255, 255, 0.55);
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.16);
}

.hero-scroll {
  position: absolute;
  left: 50%;
  bottom: 1.4rem;
  transform: translateX(-50%);
  z-index: 1;
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.75);
  animation: bob 2.4s ease-in-out infinite;
}

@keyframes bob {
  0%,
  100% {
    transform: translate(-50%, 0);
    opacity: 0.7;
  }
  50% {
    transform: translate(-50%, -6px);
    opacity: 1;
  }
}

/* Sections */
.section {
  padding: clamp(4.5rem, 10vw, 7.5rem) 0;
}

.section-heading {
  max-width: 40rem;
  margin-bottom: clamp(2.5rem, 5vw, 3.5rem);
}

.section-heading h2 {
  margin: 0.55rem 0 0;
  font-size: clamp(1.85rem, 4.2vw, 2.85rem);
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.section-heading.light,
.section-heading.light .section-desc {
  color: var(--white);
}

.section-heading.light .eyebrow {
  color: var(--sun);
}

.eyebrow {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sea-mid);
}

.section-desc {
  margin: 1rem 0 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

/* About pillars */
.pillars {
  display: grid;
  gap: 1rem;
}

@media (min-width: 700px) {
  .pillars {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .pillars {
    grid-template-columns: repeat(4, 1fr);
  }
}

.pillar {
  padding: 1.5rem 1.35rem 1.6rem;
  border-top: 2px solid var(--sea);
  background: transparent;
}

.pillar-num {
  display: block;
  margin-bottom: 1.4rem;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--coral);
}

.pillar h3 {
  margin: 0 0 0.65rem;
  font-size: 1.15rem;
}

.pillar p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

/* Programs */
.programs {
  background:
    linear-gradient(180deg, rgba(223, 243, 242, 0.55), transparent 28%),
    var(--white);
}

.program-list {
  display: grid;
  gap: 1.25rem;
}

.program {
  display: grid;
  gap: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--mist);
  outline: none;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.program:hover,
.program:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.program-visual {
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.program-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s var(--ease);
}

.program:hover .program-visual img,
.program:focus-visible .program-visual img {
  transform: scale(1.05);
}

.program-body {
  padding: 1.4rem 1.4rem 1.6rem;
}

.program-tag {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sea-mid);
}

.program-body h3 {
  margin: 0 0 0.55rem;
  font-size: 1.4rem;
}

.program-body p {
  margin: 0;
  color: var(--ink-soft);
}

.program-body ul {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.45rem;
}

.program-body li {
  position: relative;
  padding-left: 1rem;
  color: var(--ink);
  font-size: 0.95rem;
}

.program-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--coral);
}

@media (min-width: 800px) {
  .program {
    grid-template-columns: 0.95fr 1.05fr;
    align-items: stretch;
  }

  .program:nth-child(even) .program-visual {
    order: 2;
  }

  .program-visual {
    aspect-ratio: auto;
    min-height: 100%;
  }

  .program-body {
    display: grid;
    align-content: center;
    padding: 2rem 2.1rem;
  }
}

/* Outcomes */
.outcomes {
  position: relative;
  color: var(--white);
  overflow: hidden;
}

.outcomes-bg {
  position: absolute;
  inset: 0;
}

.outcomes-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) brightness(0.55);
}

.outcomes-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(4, 47, 58, 0.72), rgba(4, 47, 58, 0.88)),
    linear-gradient(90deg, rgba(4, 47, 58, 0.45), transparent 60%);
}

.outcomes .container {
  position: relative;
  z-index: 1;
}

.outcome-grid {
  display: grid;
  gap: 1rem;
  margin-bottom: 2rem;
}

@media (min-width: 800px) {
  .outcome-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.outcome {
  padding: 1.4rem 1.35rem;
  border-left: 2px solid rgba(255, 200, 87, 0.8);
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(8px);
}

.outcome h3 {
  margin: 0 0 0.55rem;
  font-size: 1.15rem;
}

.outcome p {
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.98rem;
}

.focus-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.focus-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  align-items: start;
  padding: 0.85rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  font-size: 0.98rem;
}

.focus-list li:last-child {
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.focus-list span {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--sun);
}

/* Downloads */
.downloads {
  background: var(--foam);
}

.downloads-layout {
  display: grid;
  gap: 2rem;
}

@media (min-width: 900px) {
  .downloads-layout {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: start;
    gap: 3rem;
  }

  .downloads-layout .section-heading {
    margin-bottom: 0;
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }
}

.download-list {
  display: grid;
  gap: 0.75rem;
}

.download-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 1.2rem;
  border-radius: 1rem;
  background: var(--white);
  border: 1px solid transparent;
  transition: border-color 0.25s ease, transform 0.25s var(--ease), box-shadow 0.25s ease;
}

.download-item:hover {
  border-color: rgba(10, 95, 108, 0.25);
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(4, 47, 58, 0.08);
}

.download-item strong {
  display: block;
  margin-bottom: 0.2rem;
  font-size: 1.05rem;
}

.download-item span {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.download-action {
  flex-shrink: 0;
  padding: 0.55rem 0.95rem;
  border-radius: 999px;
  background: var(--sea);
  color: var(--white) !important;
  font-size: 0.82rem !important;
  font-weight: 600;
}

.download-item.is-empty {
  opacity: 0.92;
}

.download-item.is-empty .download-action {
  background: #8aa6ac;
}

.download-item.is-pulse {
  animation: pulse-soft 0.45s var(--ease);
}

@keyframes pulse-soft {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(0.985);
  }
  100% {
    transform: scale(1);
  }
}

/* Contact */
.contact-panel {
  display: grid;
  gap: 2rem;
  padding: clamp(1.75rem, 4vw, 2.75rem);
  border-radius: calc(var(--radius) + 0.25rem);
  background:
    linear-gradient(135deg, rgba(10, 95, 108, 0.08), rgba(255, 106, 74, 0.08)),
    var(--white);
  border: 1px solid var(--line);
}

@media (min-width: 860px) {
  .contact-panel {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
}

.contact-panel h2 {
  margin: 0.55rem 0 0.9rem;
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.contact-panel > div > p:last-child {
  margin: 0;
  color: var(--ink-soft);
}

.contact-meta dl {
  margin: 0;
  display: grid;
  gap: 1.15rem;
}

.contact-meta div {
  display: grid;
  gap: 0.25rem;
}

.contact-meta dt {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sea-mid);
}

.contact-meta dd {
  margin: 0;
  font-size: 1.02rem;
}

.contact-meta a {
  color: var(--sea);
  font-weight: 600;
  border-bottom: 1px solid transparent;
}

.contact-meta a:hover {
  border-bottom-color: currentColor;
}

/* Footer */
.site-footer {
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--line);
  background: var(--mist);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (min-width: 700px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: end;
  }
}

.footer-brand {
  margin: 0 0 0.25rem;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.06em;
}

.site-footer p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.copyright {
  font-size: 0.85rem !important;
}

/* Reveal motion */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.delay-1 {
  transition-delay: 0.1s;
}
.delay-2 {
  transition-delay: 0.18s;
}
.delay-3 {
  transition-delay: 0.26s;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  z-index: 80;
  transform: translate(-50%, 12px);
  padding: 0.85rem 1.15rem;
  border-radius: 999px;
  background: var(--sea-deep);
  color: var(--white);
  font-size: 0.92rem;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s var(--ease);
}

.toast.is-show {
  opacity: 1;
  transform: translate(-50%, 0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-image,
  .hero-scroll,
  .reveal {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}