:root {
  --bg: #f3f5f8;
  --surface: #ffffff;
  --surface-soft: #eef3f7;
  --surface-deep: #081520;
  --text: #161d26;
  --muted: #637080;
  --line: #d7dfe7;
  --accent: #0dd2ff;
  --accent-soft: rgba(13, 210, 255, 0.14);
  --accent-warm: #ff9a5c;
  --max: 1240px;
  --header-height: 84px;
  --how-card-width: min(880px, 72vw);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans KR", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

a {
  color: inherit;
}

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

.container {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
}

.narrow {
  width: min(calc(100% - 2rem), 980px);
  margin: 0 auto;
}

.section {
  padding: 5rem 0;
}

.tone {
  background: #e9edf1;
}

h1,
h2,
h3 {
  margin: 0 0 1rem;
  line-height: 1.16;
}

h2 {
  font-size: clamp(2rem, 3.4vw, 2.9rem);
}

h3 {
  font-size: clamp(1.32rem, 2vw, 1.95rem);
}

p {
  margin: 0 0 1rem;
}

.section-heading {
  margin-bottom: 1.8rem;
}

.section-kicker {
  margin-bottom: .45rem;
  font-size: .8rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #5b6776;
  font-weight: 700;
}

.section-lead {
  max-width: 58ch;
  color: #51606f;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  background: transparent;
  border-bottom: 0;
  backdrop-filter: none;
}

.site-header-inner {
  display: grid;
  grid-template-columns: auto auto;
  align-items: center;
  justify-content: end;
  gap: 1rem;
}

.site-brand {
  display: none;
  text-decoration: none;
  color: #e7f2fb;
}

.site-version {
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(214, 229, 241, 0.9);
  font-weight: 700;
}

.site-nav {
  display: flex;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: .32rem;
  width: max-content;
  max-width: calc(100vw - 7rem);
  padding: .38rem;
  border-radius: 999px;
  border: 1px solid rgba(168, 205, 229, 0.38);
  background: rgba(7, 17, 27, 0.58);
  box-shadow: 0 14px 32px rgba(3, 10, 18, 0.18);
  backdrop-filter: blur(14px) saturate(130%);
}

.site-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: .55rem .95rem;
  border-radius: 999px;
  text-decoration: none;
  font-size: .85rem;
  font-weight: 700;
  color: rgba(238, 247, 255, 0.95);
  transition: background .18s ease, color .18s ease, transform .18s ease;
}

.site-link:hover,
.site-link:focus-visible,
.site-link.is-active {
  background: rgba(13, 210, 255, 0.24);
  color: #ffffff;
  transform: translateY(-1px);
  outline: none;
}

.site-nav-utility {
  position: relative;
  display: flex;
  justify-content: flex-end;
}

.nav-guide-toggle {
  width: 40px;
  height: 40px;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: .28rem;
  border-radius: 12px;
  border: 1px solid rgba(168, 205, 229, 0.38);
  background: rgba(7, 17, 27, 0.58);
  box-shadow: 0 14px 32px rgba(3, 10, 18, 0.18);
  backdrop-filter: blur(14px) saturate(130%);
}

.nav-guide-toggle span {
  width: 15px;
  height: 2px;
  border-radius: 999px;
  background: #edf6ff;
}

.nav-guide-panel {
  position: absolute;
  top: calc(100% + .8rem);
  right: 0;
  width: 250px;
  padding: 1rem;
  border: 1px solid rgba(172, 194, 213, 0.28);
  border-radius: 18px;
  background: rgba(9, 19, 30, 0.94);
  box-shadow: 0 22px 42px rgba(3, 10, 18, 0.24);
  backdrop-filter: blur(16px);
  color: #eaf4ff;
}

.nav-guide-item + .nav-guide-item {
  margin-top: .75rem;
  padding-top: .75rem;
  border-top: 1px solid rgba(149, 177, 199, 0.18);
}

.nav-guide-item strong {
  display: block;
  margin-bottom: .18rem;
  font-size: .88rem;
  color: #b7ebff;
}

.nav-guide-item span {
  display: block;
  font-size: .79rem;
  line-height: 1.45;
  color: rgba(221, 233, 243, 0.84);
}

.hero {
  position: relative;
  min-height: 100vh;
  margin-top: calc(var(--header-height) * -1);
  background: #07121d;
}

.hero-stage {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
}

.hero-version {
  position: absolute;
  z-index: 2;
  top: calc(var(--header-height) + .45rem);
  left: clamp(1rem, 3.8vw, 3rem);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(232, 243, 252, 0.94);
  font-weight: 700;
  text-shadow: 0 2px 12px rgba(3, 10, 18, 0.42);
}

.hero-visual {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(7, 16, 27, 0.04) 0%, rgba(7, 16, 27, 0.18) 58%, rgba(7, 16, 27, 0.46) 100%),
    url("../assets/hero-system-flow.png");
  background-position: 60% 48%;
  background-size: min(94vw, 1680px) auto;
  background-repeat: no-repeat;
  background-color: #07121d;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(3, 10, 18, 0.68) 0%, rgba(3, 10, 18, 0.42) 24%, rgba(3, 10, 18, 0.08) 58%, rgba(3, 10, 18, 0.18) 100%),
    linear-gradient(180deg, rgba(3, 10, 18, 0.02) 0%, rgba(3, 10, 18, 0.1) 100%);
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 32%;
  background:
    linear-gradient(180deg, rgba(3, 10, 18, 0) 0%, rgba(3, 10, 18, 0.28) 100%),
    repeating-linear-gradient(90deg, rgba(56, 168, 223, 0.04) 0, rgba(56, 168, 223, 0.04) 1px, transparent 1px, transparent 88px),
    repeating-linear-gradient(0deg, rgba(56, 168, 223, 0.04) 0, rgba(56, 168, 223, 0.04) 1px, transparent 1px, transparent 88px);
  transform: perspective(900px) rotateX(80deg);
  transform-origin: bottom;
  opacity: .58;
}

.hero-overlay {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  align-items: start;
  padding: calc(var(--header-height) + 1.55rem) 0 1.5rem;
}

.hero-overlay-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .8rem;
  width: 100%;
  margin: 0;
  padding-inline: clamp(1rem, 3.8vw, 3rem);
}

.hero-profile-card {
  width: 100%;
  max-width: 430px;
  padding: 1.15rem 1.25rem 1.2rem;
  border-radius: 22px;
  border: 1px solid rgba(155, 211, 241, 0.3);
  background: rgba(8, 18, 29, 0.82);
  box-shadow: 0 20px 40px rgba(4, 10, 16, 0.32);
  backdrop-filter: blur(16px) saturate(120%);
  color: #f3f8ff;
}

.hero-card-label {
  display: block;
  margin-bottom: .35rem;
  font-size: .64rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #8edcff;
  font-weight: 700;
}

.hero-profile-card strong {
  display: block;
  margin-bottom: .3rem;
  font-size: 1.45rem;
}

.hero-card-role {
  margin-bottom: .62rem;
  color: rgba(224, 236, 246, 0.84);
  font-size: 1.02rem;
}

.hero-mini-meta {
  display: grid;
  gap: .5rem;
  margin: 0 0 .85rem;
}

.hero-mini-meta div {
  display: grid;
  gap: .15rem;
}

.hero-mini-meta dt {
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(145, 220, 255, 0.84);
  font-weight: 700;
}

.hero-mini-meta dd {
  margin: 0;
  color: #e6f2fc;
  font-size: 1.02rem;
}

.hero-mini-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  padding: 0;
  margin: 0 0 .75rem;
}

.hero-mini-tags li {
  padding: .34rem .66rem;
  border-radius: 999px;
  border: 1px solid rgba(149, 192, 219, 0.22);
  background: rgba(15, 31, 47, 0.68);
  font-size: .82rem;
  color: #dceaf7;
}

.hero-mini-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: .6rem 1rem;
  border-radius: 999px;
  border: 1px solid rgba(156, 195, 222, 0.38);
  background: rgba(10, 21, 32, 0.58);
  color: #f0f7ff;
  text-decoration: none;
  font-weight: 700;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.hero-copy {
  max-width: min(860px, 72vw);
  flex: 0 0 auto;
}

.hero-copy h1 {
  margin-bottom: 0;
  color: #f4f9ff;
  font-size: clamp(1.2rem, 5.25vw, 6rem);
  line-height: .96;
  letter-spacing: -.04em;
  text-shadow: 0 10px 30px rgba(0, 0, 0, 0.32);
}

.hero-title-line {
  display: block;
  white-space: nowrap;
}

.hero-mini-link:hover,
.hero-mini-link:focus-visible {
  transform: translateY(-2px);
  outline: none;
}

.section-evidence {
  padding-top: 4rem;
}

.grid {
  display: grid;
  gap: 1rem;
}

.grid.tools {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  padding: 1.2rem;
}

.card.emphasis {
  padding: 1.3rem;
}

.tool-card,
.how-slide,
.editorial-copy,
.vision-panel,
.resource-card,
.process-step,
.principle-card,
.case-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(243, 247, 251, 0.98));
}

.card.compact p {
  color: var(--muted);
}

.tool-media-slot,
.card-media-slot {
  overflow: hidden;
  border: 1px solid #ccd7e2;
  background: #f7fafc;
  color: #545b65;
  display: grid;
  place-items: center;
  text-align: center;
}

.modal-media {
  border: 1.5px dashed #aab0b8;
  background: repeating-linear-gradient(
    -45deg,
    #f3f4f6,
    #f3f4f6 10px,
    #ebeef1 10px,
    #ebeef1 20px
  );
  color: #545b65;
  display: grid;
  place-items: center;
  text-align: center;
}

.tool-media-slot,
.card-media-slot {
  aspect-ratio: 16 / 9;
  height: auto;
  margin-bottom: .9rem;
  border-radius: 14px;
}

.tool-media-slot img,
.tool-media-slot iframe,
.tool-media-slot video,
.card-media-slot img,
.card-media-slot iframe,
.card-media-slot video {
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 14px;
  object-fit: contain;
  background: #ffffff;
}

.editorial-story {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 1.25rem;
  align-items: stretch;
}

.editorial-visual {
  min-height: 420px;
  padding: 1.4rem;
  display: grid;
  align-content: end;
  gap: .75rem;
  border-radius: 24px;
  border: 1px solid rgba(71, 105, 136, 0.22);
  background:
    radial-gradient(circle at 28% 30%, rgba(13, 210, 255, 0.22), transparent 22%),
    linear-gradient(160deg, rgba(8, 26, 41, 0.22), rgba(8, 26, 41, 0.72)),
    linear-gradient(135deg, #15304a 0%, #09131d 74%);
  box-shadow: 0 24px 46px rgba(14, 23, 34, 0.12);
  color: #edf6ff;
}

.editorial-visual::before {
  content: "";
  align-self: stretch;
  display: block;
  border-radius: 16px;
  border: 1px solid rgba(135, 199, 233, 0.18);
  background:
    linear-gradient(180deg, rgba(8, 18, 29, 0.18), rgba(8, 18, 29, 0.62)),
    repeating-linear-gradient(90deg, rgba(83, 214, 255, 0.08) 0, rgba(83, 214, 255, 0.08) 1px, transparent 1px, transparent 48px),
    repeating-linear-gradient(0deg, rgba(83, 214, 255, 0.08) 0, rgba(83, 214, 255, 0.08) 1px, transparent 1px, transparent 48px);
  min-height: 220px;
}

.editorial-label {
  font-size: .8rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #9fe6ff;
  font-weight: 700;
}

.editorial-visual strong {
  max-width: 16ch;
  font-size: clamp(1.5rem, 2.6vw, 2.15rem);
  line-height: 1.2;
}

.editorial-copy,
.vision-panel,
.resource-card {
  border: 1px solid var(--line);
  border-radius: 18px;
}

.editorial-copy {
  padding: 1.2rem 1.25rem;
}

.how-group {
  background: linear-gradient(180deg, #e8edf1 0%, #f4f6f8 100%);
  padding: 5rem 0;
}

.how-intro {
  padding-bottom: 1.2rem;
}

.how-slider-shell {
  perspective: 1800px;
}

.slider-shell {
  position: relative;
  padding: 0 3.5rem;
  overflow: hidden;
}

.slider-track {
  display: grid;
  grid-auto-flow: column;
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  scrollbar-width: none;
}

.slider-track::-webkit-scrollbar {
  display: none;
}

.slider-track > * {
  scroll-snap-align: center;
}

.how-slider {
  position: relative;
  display: block;
  min-height: clamp(560px, 58vw, 720px);
  padding: 1.25rem 0 3rem;
  overflow: visible;
}

.how-slide {
  position: absolute;
  top: 1.25rem;
  left: 50%;
  width: var(--how-card-width);
  min-height: 100%;
  border-radius: 24px;
  border: 1px solid rgba(127, 152, 176, 0.38);
  box-shadow: 0 20px 36px rgba(20, 31, 45, 0.12);
  transform-origin: center center;
  transition: transform .35s ease, opacity .35s ease, filter .35s ease, box-shadow .35s ease;
  opacity: .28;
  filter: saturate(.75);
  z-index: 1;
  pointer-events: none;
}

.how-slide.is-active {
  opacity: 1;
  transform: translateX(-50%) scale(1) rotateY(0deg);
  box-shadow: 0 28px 54px rgba(20, 31, 45, 0.2);
  filter: saturate(1);
  z-index: 3;
  pointer-events: auto;
}

.how-slide.is-prev {
  opacity: .54;
  transform: perspective(1800px) translateX(-62%) rotateY(38deg) scale(.92);
  z-index: 2;
}

.how-slide.is-next {
  opacity: .54;
  transform: perspective(1800px) translateX(-30%) rotateY(-38deg) scale(.92);
  z-index: 2;
}

.how-slide-head {
  margin-bottom: 1.2rem;
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.principle-card {
  position: relative;
  min-height: 220px;
}

.principle-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  min-height: 30px;
  margin-bottom: 1.1rem;
  padding: 0 .7rem;
  border-radius: 999px;
  background: #16344d;
  color: #eff8ff;
  font-size: .78rem;
  font-weight: 700;
}

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

.process-step {
  position: relative;
  padding: 1.15rem;
  border: 1px solid var(--line);
  border-radius: 18px;
}

.process-step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 2.1rem;
  right: -1rem;
  width: 1rem;
  height: 1px;
  background: #b8c7d3;
}

.process-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  min-height: 42px;
  margin-bottom: .9rem;
  border-radius: 14px;
  background: #0f2940;
  color: #f2f9ff;
  font-size: .84rem;
  font-weight: 800;
  letter-spacing: .08em;
}

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

.case-card {
  min-height: 100%;
}

.slider-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid #9daab7;
  background: rgba(255, 255, 255, 0.94);
  color: #24394f;
  font-size: 1.8rem;
  line-height: 1;
  box-shadow: 0 12px 26px rgba(21, 32, 46, 0.12);
}

.slider-nav-prev {
  left: .6rem;
}

.slider-nav-next {
  right: .6rem;
}

.slider-dots {
  display: flex;
  justify-content: center;
  gap: .55rem;
  margin-top: 1rem;
}

.scene-dot {
  width: 10px;
  height: 10px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: #b7c1cb;
}

.scene-dot.is-active {
  width: 28px;
  background: #244a69;
}

.vision-panel {
  padding: 1.35rem 1.4rem;
}

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

.resource-card {
  padding: 1.2rem;
}

.resource-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-top: .4rem;
  padding: .7rem 1.05rem;
  border-radius: 999px;
  border: 1px solid rgba(36, 74, 105, 0.24);
  background: #173a55;
  color: #f2f8ff;
  text-decoration: none;
  font-weight: 800;
}

.resource-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0 .65rem;
  margin-bottom: .9rem;
  border-radius: 999px;
  background: rgba(36, 74, 105, 0.1);
  color: #244a69;
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .04em;
}

.interactive-card {
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.interactive-card:hover,
.interactive-card:focus-visible {
  transform: translateY(-4px);
  border-color: #8ca8c2;
  box-shadow: 0 18px 34px rgba(25, 40, 58, 0.1);
  outline: none;
}

button {
  border: 1px solid #aeb7bf;
  background: #f8fafc;
  padding: .5rem .75rem;
  border-radius: 8px;
  cursor: pointer;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(17, 20, 24, 0.58);
  z-index: 99;
}

.modal-backdrop[hidden] {
  display: none;
}

.modal {
  position: relative;
  width: min(100%, 740px);
  max-height: 88vh;
  overflow: auto;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
}

.modal-close {
  position: absolute;
  top: .65rem;
  right: .65rem;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  font-size: 1.25rem;
  line-height: 1;
  z-index: 2;
}

.modal-media {
  min-height: 170px;
  margin-bottom: .8rem;
  border-radius: 12px;
}

.modal-description-label {
  margin-bottom: .35rem;
  font-size: .85rem;
  letter-spacing: .08em;
  color: var(--muted);
  font-weight: 700;
}

#modalTitle {
  margin-bottom: .55rem;
  padding-right: 2rem;
  font-size: 1.35rem;
}

#modalBody {
  margin: 0;
  min-height: 92px;
  padding: .9rem;
  border: 1px dashed #b6bcc5;
  border-radius: 12px;
  background: #fafbfc;
}

body.modal-open {
  overflow: hidden;
}

@media (max-width: 1180px) {
  :root {
    --max: 1080px;
    --how-card-width: 900px;
  }

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

  .hero-overlay-inner {
    padding-inline: clamp(1rem, 3vw, 2rem);
  }

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

  .process-step:nth-child(2)::after,
  .process-step:nth-child(4)::after {
    display: none;
  }

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

  .slider-shell {
    overflow: visible;
  }

  .how-slider {
    min-height: 0;
    padding-bottom: 1rem;
  }

  .how-slide {
    position: relative;
    top: auto;
    left: auto;
    display: none;
    width: 100%;
    min-height: auto;
    transform: none;
    opacity: 1;
    filter: none;
  }

  .how-slide.is-active {
    display: block;
    transform: none;
  }

  .how-slide.is-prev,
  .how-slide.is-next {
    display: none;
  }
}

@media (max-width: 980px) {
  :root {
    --how-card-width: 86vw;
  }

  .site-header-inner {
    grid-template-columns: auto auto;
    align-items: center;
    justify-content: end;
  }

  .site-nav {
    grid-column: auto;
    order: 0;
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .site-nav::-webkit-scrollbar {
    display: none;
  }

  .site-nav-utility {
    order: 0;
  }

  .hero-overlay-inner {
    gap: 1.25rem;
    padding-inline: 1rem;
  }

  .editorial-story,
  .resource-grid,
  .principle-grid {
    grid-template-columns: 1fr;
  }

  .process-flow {
    grid-template-columns: 1fr;
  }

  .process-step::after {
    display: none;
  }

}

@media (max-width: 640px) {
  :root {
    --header-height: 74px;
    --how-card-width: 88vw;
  }

  .container,
  .narrow {
    width: min(calc(100% - 1.25rem), var(--max));
  }

  .site-header-inner {
    gap: .75rem;
  }

  .site-nav {
    gap: .25rem;
    padding: .3rem;
    flex-wrap: nowrap;
    justify-content: flex-start;
    overflow-x: auto;
    max-width: calc(100vw - 5.5rem);
    scrollbar-width: none;
  }

  .site-nav::-webkit-scrollbar {
    display: none;
  }

  .site-link {
    min-height: 34px;
    padding: .45rem .75rem;
    font-size: .8rem;
  }

  .nav-guide-panel {
    width: min(240px, calc(100vw - 2rem));
  }

  .hero-overlay {
    padding: calc(var(--header-height) + .8rem) 0 2.25rem;
  }

  .hero-visual {
    background-position: 58% bottom;
    background-size: auto 100%;
  }

  .hero-copy h1 {
    font-size: clamp(.95rem, 5.5vw, 2.8rem);
  }

  .grid.tools {
    grid-template-columns: 1fr;
  }

  .case-grid {
    grid-template-columns: 1fr;
  }

  .slider-shell {
    padding: 0 2.75rem;
  }
}