:root {
  color-scheme: dark;
  --bg: #050608;
  --panel: rgba(15, 18, 24, 0.84);
  --panel-strong: rgba(24, 28, 38, 0.96);
  --line: rgba(255, 255, 255, 0.13);
  --text: #f4f7fb;
  --muted: #a6afbd;
  --blue: #26a8ff;
  --green: #6cff8f;
  --pink: #ff4fd8;
  --yellow: #f8e86a;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 20% 10%, rgba(38, 168, 255, 0.15), transparent 26rem),
    radial-gradient(circle at 80% 0%, rgba(108, 255, 143, 0.11), transparent 24rem),
    var(--bg);
  color: var(--text);
  font-family: "Noto Sans KR", system-ui, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

body.modal-open {
  overflow: hidden;
}

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

button {
  font: inherit;
}

.cursor {
  position: fixed;
  z-index: 100;
  width: 22px;
  height: 22px;
  border: 1px solid rgba(108, 255, 143, 0.8);
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
  mix-blend-mode: difference;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(5, 6, 8, 0.68);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  font-weight: 900;
  letter-spacing: 0;
}

.brand span {
  color: var(--green);
}

nav {
  display: flex;
  gap: clamp(0.75rem, 3vw, 1.8rem);
  color: var(--muted);
  font-size: 0.9rem;
}

nav a:hover,
nav a:focus-visible {
  color: var(--text);
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 360px);
  align-items: end;
  gap: clamp(1.5rem, 4vw, 4rem);
  padding: 8rem clamp(1rem, 5vw, 4rem) 5rem;
  isolation: isolate;
}

#hero-canvas {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(5, 6, 8, 0.88), rgba(5, 6, 8, 0.38)),
    linear-gradient(0deg, var(--bg), transparent 42%);
}

.hero-copy,
.hero-panel,
.section,
.footer {
  max-width: var(--max);
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--green);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 980px;
  margin: 0;
  font-size: clamp(4.4rem, 12vw, 5.8rem);
  line-height: 0.88;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 span {
  font-family: "Noto Serif KR", serif;
  font-style: normal;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.82);
}

.hero-lead {
  max-width: 650px;
  margin: 2rem 0 0;
  color: #d8dee8;
  font-size: clamp(1rem, 2vw, 1.35rem);
  font-weight: 500;
}

.hero-panel {
  justify-self: end;
  width: 100%;
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(5, 6, 8, 0.54);
  backdrop-filter: blur(16px);
}

.hero-panel p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-panel dl {
  margin: 0;
  display: grid;
  gap: 0.75rem;
}

.hero-panel div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
}

.hero-panel dt {
  color: var(--muted);
}

.hero-panel dd {
  margin: 0;
  font-weight: 900;
}

.section {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 8rem) 0;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.25fr);
  gap: clamp(1.5rem, 5vw, 5rem);
  align-items: end;
  margin-bottom: 2rem;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2.0rem, 2vw, 2.0rem);
  line-height: 1;
  letter-spacing: 0;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.course-grid article {
  min-height: 100px;
  padding: 1.25rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
}

.course-grid span {
  display: block;
  margin-bottom: 1.4rem;
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
}

.course-grid strong {
  display: block;
  font-size: clamp(1.05rem, 1.6vw, 1.35rem);
  line-height: 1.45;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.filter,
.project-card,
.modal-close {
  cursor: pointer;
}

.filter {
  min-height: 42px;
  padding: 0.55rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
}

.filter.active,
.filter:hover,
.filter:focus-visible {
  border-color: rgba(108, 255, 143, 0.7);
  background: rgba(108, 255, 143, 0.12);
  color: var(--text);
}

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

.project-card {
  position: relative;
  min-height: 430px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  text-align: left;
  transition: transform 220ms ease, border-color 220ms ease, background 220ms ease;
}

.project-card:hover,
.project-card:focus-visible {
  transform: translateY(-6px);
  border-color: rgba(38, 168, 255, 0.55);
  background: var(--panel-strong);
}

.project-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, var(--accent), transparent 38%),
    radial-gradient(circle at 78% 16%, rgba(255, 255, 255, 0.22), transparent 3rem);
  opacity: 0.78;
  transition: transform 360ms ease;
}

.project-card:hover::before,
.project-card:focus-visible::before {
  transform: scale(1.07);
}

.card-art {
  position: relative;
  height: 160px;
  margin: -1rem -1rem 1rem;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.card-art::before,
.card-art::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.card-art::before {
  width: 86px;
  height: 86px;
  right: 18%;
  top: 22%;
  transform: rotate(18deg);
  background: rgba(255, 255, 255, 0.05);
}

.card-art::after {
  width: 180px;
  height: 1px;
  left: 8%;
  bottom: 30%;
  background: rgba(255, 255, 255, 0.4);
  box-shadow: 0 24px 0 rgba(255, 255, 255, 0.24), 0 -24px 0 rgba(255, 255, 255, 0.18);
}

.project-card > * {
  position: relative;
  z-index: 1;
}

.card-index {
  color: var(--green);
  font-weight: 900;
  font-size: 0.82rem;
}

.card-title {
  display: block;
  margin: 0.45rem 0 0.7rem;
  font-size: clamp(1.3rem, 2.4vw, 2rem);
  font-weight: 900;
  line-height: 1.08;
}

.card-copy {
  display: block;
  margin: 0;
  color: #d5dce6;
  font-size: 0.93rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 1.2rem;
}

.tag {
  display: inline-flex;
  max-width: 100%;
  padding: 0.22rem 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.74rem;
}

.footer {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding: 5rem 0 3rem;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(240px, 0.7fr);
  gap: 2rem;
  border-top: 1px solid var(--line);
}

.footer h2 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(2rem, 5vw, 4.8rem);
  line-height: 1;
}

.footer > p {
  align-self: end;
  margin: 0;
  color: var(--muted);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal.is-open {
  display: flex;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.76);
  backdrop-filter: blur(16px);
}

.modal-dialog {
  position: relative;
  width: min(960px, 100%);
  max-height: min(86svh, 900px);
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #0b0e13;
  box-shadow: 0 30px 100px rgba(0, 0, 0, 0.45);
}

.modal-close {
  position: sticky;
  top: 0.8rem;
  z-index: 2;
  float: right;
  width: 42px;
  height: 42px;
  margin: 0.8rem 0.8rem 0 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  font-size: 1.6rem;
  line-height: 1;
}

.modal-hero {
  min-height: 260px;
  padding: 2rem;
  background:
    linear-gradient(135deg, var(--accent), transparent 42%),
    linear-gradient(0deg, rgba(11, 14, 19, 0.92), rgba(11, 14, 19, 0.3));
  border-bottom: 1px solid var(--line);
}

.modal-hero h2 {
  max-width: 780px;
  margin: 0.5rem 0 0;
  font-size: clamp(2.1rem, 6vw, 4.7rem);
  line-height: 1.02;
}

.modal-gallery {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(220px, 0.65fr);
  gap: 0.8rem;
  padding: 0.8rem;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.018)),
    #0b0e13;
}

.project-image {
  position: relative;
  min-height: 260px;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
}

.project-image-main {
  min-height: clamp(320px, 48vw, 520px);
}

.project-image-students {
  min-height: clamp(260px, 34vw, 520px);
}

.project-image img {
  width: 100%;
  height: 100%;
  min-height: inherit;
  display: block;
  object-fit: contain;
  background: rgba(255, 255, 255, 0.03);
}

.project-image figcaption {
  position: absolute;
  left: 0.8rem;
  bottom: 0.8rem;
  padding: 0.24rem 0.55rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  background: rgba(5, 6, 8, 0.72);
  color: #f4f7fb;
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  backdrop-filter: blur(12px);
}

.modal-body {
  padding: 2rem;
}

.modal-summary {
  max-width: 780px;
  margin: 0 0 2rem;
  color: #dce3ec;
  font-size: 1.05rem;
}

.modal-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin-bottom: 2rem;
}

.modal-meta div,
.detail-block {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.035);
}

.modal-meta span,
.detail-block h3 {
  display: block;
  margin: 0 0 0.55rem;
  color: var(--green);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.modal-meta p,
.detail-block p {
  margin: 0;
  color: #dce3ec;
}

.detail-stack {
  display: grid;
  gap: 0.8rem;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 700ms ease, transform 700ms ease;
}

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

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    align-items: end;
  }

  .hero-panel {
    justify-self: stretch;
  }

  .section-heading,
  .footer {
    grid-template-columns: 1fr;
  }

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

  .modal-gallery {
    grid-template-columns: 1fr;
  }

  .project-image,
  .project-image-main,
  .project-image-students {
    min-height: 300px;
  }
}

@media (max-width: 640px) {
  .cursor {
    display: none;
  }

  .site-header {
    align-items: flex-start;
  }

  nav {
    gap: 0.75rem;
    font-size: 0.82rem;
  }

  .hero {
    min-height: 92svh;
    padding-top: 6.5rem;
  }

  h1 {
    font-size: clamp(3.4rem, 17vw, 5.8rem);
  }

  .course-grid,
  .project-grid,
  .modal-meta {
    grid-template-columns: 1fr;
  }

  .project-card {
    min-height: 380px;
  }

  .modal {
    padding: 0.5rem;
  }

  .modal-hero,
  .modal-body {
    padding: 1.25rem;
  }

  .modal-gallery {
    padding: 0.5rem;
  }

  .project-image,
  .project-image-main,
  .project-image-students {
    min-height: 230px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }
}

/* Sketch Section */
.sketch-video-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  margin-top: 2rem;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.4s ease, box-shadow 0.4s ease;
}

.sketch-video-container:hover {
  transform: translateY(-4px) scale(1.005);
  border-color: rgba(38, 168, 255, 0.45);
  box-shadow: 0 24px 48px rgba(38, 168, 255, 0.15);
}

.sketch-video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* Demo Day Section */
.demoday-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.demoday-card {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  cursor: pointer;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.4s ease, box-shadow 0.4s ease;
}

.demoday-card:hover {
  transform: translateY(-6px) scale(1.02);
  border-color: rgba(108, 255, 143, 0.45);
  box-shadow: 0 16px 36px rgba(108, 255, 143, 0.12);
}

.demoday-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.demoday-card:hover img {
  transform: scale(1.05);
}

.demoday-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, rgba(5, 6, 8, 0.72) 0%, transparent 60%);
  display: flex;
  align-items: flex-end;
  padding: 1.25rem;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 1;
}

.demoday-card:hover .demoday-overlay {
  opacity: 1;
}

.demoday-number {
  color: var(--green);
  font-family: "Noto Serif KR", serif;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

/* Lightbox Modal */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.lightbox.is-open {
  display: flex;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(5, 6, 8, 0.94);
  backdrop-filter: blur(16px);
}

.lightbox-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 152;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  font-size: 1.8rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.35);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 152;
  width: 52px;
  height: 52px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.25s ease;
}

.lightbox-nav:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(108, 255, 143, 0.65);
  color: var(--green);
}

.lightbox-prev {
  left: 2rem;
}

.lightbox-next {
  right: 2rem;
}

.lightbox-content {
  position: relative;
  z-index: 151;
  max-width: min(100%, 1200px);
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  animation: lightboxFadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes lightboxFadeIn {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.lightbox-content img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.lightbox-counter {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  font-weight: 500;
}

/* Responsiveness for Demo Day */
@media (max-width: 980px) {
  .demoday-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .demoday-grid {
    grid-template-columns: 1fr;
  }
  .lightbox-nav {
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }
  .lightbox-prev {
    left: 0.5rem;
  }
  .lightbox-next {
    right: 0.5rem;
  }
}