:root {
  --ei-ink: #111111;
  --ei-muted-a: #333333;
  --ei-muted-b: #565b62;
  --ei-line: #cbd3db;
  --ei-blue-deep: #0b4198;
  --ei-blue-light: #c9ebfb;
  --ei-blue-strong: #246cf2;
  --ei-teal: #2b6678;
  --ei-teal-hover: #1a45d3;
  --ei-max: 1200px;
}

.ei-page,
.ei-page * {
  box-sizing: border-box;
}

.ei-page {
  overflow: hidden;
  color: var(--ei-ink);
  font-family: "Pretendard", "Noto Sans KR", Arial, sans-serif;
  word-break: keep-all;
}

.ei-page h1,
.ei-page h2,
.ei-page h3,
.ei-page p {
  margin-top: 0;
  letter-spacing: 0;
}

.ei-page img {
  display: block;
  max-width: 100%;
  height: auto;
}

.ei-container {
  width: min(var(--ei-max), calc(100% - 48px));
  margin: 0 auto;
}

/* Product bar */
.ei-product-bar {
  border-top: 1px solid #cbd3db;
  background: #f3f3f3;
}

.ei-product-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  gap: 24px;
  font-size: 30px;
}

.ei-product-bar strong {
  font-size: inherit;
  font-weight: 600;
}

/* Hero */
.ei-hero {
  color: #fff;
  background: var(--ei-blue-deep);
}

.ei-hero-inner {
  display: grid;
  min-height: 600px;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.9fr);
  gap: 70px;
  align-items: center;
}

.ei-hero-copy {
  max-width: 650px;
}

.ei-hero-copy h1 {
  margin: 0 0 28px;
  color: #fff;
  font-size: 44px;
  font-weight: 700;
  line-height: 1.3;
}

.ei-hero-copy h1 sup {
  font-size: 0.5em;
  vertical-align: super;
}

.ei-hero-copy p {
  max-width: 560px;
  margin: 0;
  color: #fff;
  font-size: 18px;
  line-height: 1.75;     word-break: keep-all;
}

.ei-hero-media img {
  display: block;
  width: 100%;
  border-radius: 4px;
  aspect-ratio: 1.55 / 1;
  object-fit: cover;
}

/* Overview (light blue, illustration + copy) */
.ei-overview {
  background: var(--ei-blue-light);
}

.ei-overview-inner {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 70px;
  align-items: center;
  padding: 90px 0;
}

.ei-overview-media img {
  width: 100%;
  height: auto;
}

.ei-overview-copy p {
  margin: 0 0 22px;
  color: var(--ei-ink);
  font-size: 18px;
  line-height: 1.75;     word-break: keep-all;
}

.ei-overview-copy p:last-child {
  margin-bottom: 0;
}

/* Document panel */
.ei-document {
  padding: 100px 0;
}

.ei-document-panel {
  display: grid;
  min-height: 320px;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  padding: 60px 74px;
  border-radius: 20px;
  color: #fff;
  background: var(--ei-blue-strong);
}

.ei-document-panel span,
.ei-document-panel strong {
  display: block;
}

.ei-document-panel span {
  margin-bottom: 10px;
  font-size: 18px;
}

.ei-document-panel strong {
  font-size: 40px;
}

.ei-document-panel p {
  margin: 0 0 20px;
  font-size: 18px;
  line-height: 1.65;
}

.ei-document-panel a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.85);
  padding-bottom: 4px;
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.5;
  text-decoration: none;
}

.ei-document-panel a svg {
  flex-shrink: 0;
}

/* Platform / tabs */
.ei-platform {
  padding: 0 0 110px;
  text-align: center;
}

.ei-platform h2 {
  margin: 0 0 18px;
  font-size: 36px;
  line-height: 1.35;
}

.ei-platform-intro {
  margin: 0 0 56px;
  color: var(--ei-muted-b);
  font-size: 18px;
  line-height: 1.7;
}

.ei-tabs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-bottom: 1px solid var(--ei-line);
}

.ei-tab {
  position: relative;
  min-height: 62px;
  padding: 0 8px;
  border: 0;
  color: #111111;
  background: transparent;
  font: inherit;
  font-size: 22px;
  font-weight: 700;
  cursor: pointer;
}

.ei-tab::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 3px;
  background: transparent;
  content: '';
}

.ei-tab.is-active::after {
  background: var(--ei-blue-strong);
}

.ei-tab:focus-visible {
  outline: 2px solid var(--ei-blue-strong);
  outline-offset: -4px;
}

.ei-tab-panels {
  min-height: 420px;
}

.ei-tab-panel {
  padding: 52px 0 0;
}

.ei-tab-panel[hidden] {
  display: none;
}

.ei-tab-panel.is-active {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 70px;
  align-items: start;
  text-align: left;
}

.ei-context-copy h3 {
  margin: 0 0 22px;
  font-size: 27px;
  line-height: 1.4;
}

.ei-context-copy p {
  margin: 0;
  color: var(--ei-muted-b);
  font-size: 18px;
  line-height: 1.75;
}

.ei-tab-panel > img {
  display: block;
  width: 100%;
  height: auto;
}

/* Full-bleed banner */
.ei-banner img {
  display: block;
  width: 100%;
  height: min(520px, 46vw);
  object-fit: cover;
}

/* Use cases */
.ei-usecases {
  padding: 100px 0;
  text-align: center;
  background: #f3f3f3;
}

.ei-usecases h2 {
  margin: 0 0 60px;
  font-size: 36px;
  line-height: 1.3;
}

.ei-usecase-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 76px;
  row-gap: 48px;
  margin: 0 auto 56px;
  max-width: 940px;
}

.ei-usecase img {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  object-fit: contain;
}

.ei-usecase h3 {
  margin: 0 0 14px;
  font-size: 20px;
  line-height: 1.4;
}

.ei-usecase p {
  margin: 0 auto;
  max-width: 380px;
  color: var(--ei-muted-a);
  font-size: 18px;
  line-height: 1.7;
}

.ei-usecase-cta {
  text-align: center;
}

.ei-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 28px;
  border: 1px solid transparent;
  border-radius: 999px;
  color: #fff;
  background: var(--ei-teal);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background-color .2s ease, border-color .2s ease;
}

.ei-btn:hover {
  background: var(--ei-teal-hover);
}

/* Resources */
.ei-resources {
  padding: 100px 0;
  color: #111111;
  background: #fff;
}

.ei-resource-heading {
  margin-bottom: 52px;
}

.ei-resource-heading p {
  margin: 0 0 18px;
  color: #333333;
  font-size: 15px;
  line-height: 1.4;
}

.ei-resource-heading h2 {
  margin: 0;
  color: #111111;
  font-size: 36px;
  line-height: 1.35; text-align:center;
}

.ei-resource-grid {
  display: grid;
  grid-template-columns: repeat(3, 370px);
  justify-content: center;
  column-gap: 34px;
  row-gap: 42px;
}

.ei-resource-card {
  display: flex;
  min-width: 0;
  min-height: 480px;
  flex-direction: column;
  overflow: hidden;
  border-radius: 8px;
  color: var(--ei-ink);
  background: #f3f3f3;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .05);
}

.ei-resource-card > img {
  width: 100%;
  aspect-ratio: 1.62 / 1;
  object-fit: cover;
}

.ei-resource-card > div {
  display: flex;
  flex: 1;
  flex-direction: column;
  align-items: flex-start;
  padding: 20px 28px;
}

.ei-resource-card span {
  margin-bottom: 12px;
  color: #515151;
  font-size: 15px;
  font-weight: 400;
}

.ei-resource-card h3 {
  margin-bottom: 24px;
  font-size: 18px;
  line-height: 1.4;
}

.ei-resource-card a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  margin-top: auto;
  padding: 0 20px;
  border: 1px solid #111111;
  border-radius: 999px;
  color: var(--ei-ink);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
}

.ei-resource-card a:hover {
  color: #fff;
  background: var(--ei-ink);
}

/* Tech zone */
.ei-tech-zone {
  color: #fff;
  background: var(--ei-blue-strong);
}

.ei-tech-zone-inner {
  display: flex;
  min-height: 300px;
  align-items: center;
  justify-content: space-between;
  padding: 70px 0;
  gap: 60px;
}

.ei-tech-zone h2 {
  margin: 0 0 18px;
  font-size: 36px;
}

.ei-tech-zone p {
  max-width: 620px;
  margin: 0 0 30px;
  font-size: 18px;
  line-height: 1.7;
}

.ei-tech-zone a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 0 26px;
  border-radius: 22px;
  color: #111111;
  background: #fff;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.ei-tech-zone img {
  width: min(30%, 310px);
  height: auto;
}

/* Responsive */
@media (max-width: 1024px) {
  .ei-hero-inner {
    min-height: 0;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 0.9fr);
    gap: 44px;
  }

  .ei-hero-copy h1 {
    font-size: 34px;
  }

  .ei-overview-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 64px 0;
  }

  .ei-overview-media {
    max-width: 360px;
    margin: 0 auto;
  }

  .ei-document-panel {
    grid-template-columns: 1fr;
    gap: 30px;
    padding: 44px 48px;
    text-align: left;
  }

  .ei-tab-panel.is-active {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .ei-usecase-grid {
    column-gap: 40px;
  }

  .ei-resource-grid {
    grid-template-columns: repeat(2, minmax(0, 285px));
  }
}

@media (max-width: 768px) {
  .ei-container {
    width: min(100% - 32px, 620px);
  }

  .ei-product-bar-inner {
    min-height: 64px;
    font-size: 22px;
  }

  .ei-hero-inner {
    grid-template-columns: 1fr;
    gap: 34px;
    padding: 56px 0;
  }

  .ei-hero-copy h1 {
    font-size: 29px;
  }

  .ei-hero-copy p {
    font-size: 16px;
  }

  .ei-overview-inner {
    padding: 48px 0;
  }

  .ei-document {
    padding: 60px 0;
  }

  .ei-document-panel {
    padding: 36px 28px;
    border-radius: 12px;
  }

  .ei-document-panel strong {
    font-size: 32px;
  }

  .ei-document-panel span,
  .ei-document-panel p {
    font-size: 16px;
  }

  .ei-platform {
    padding-bottom: 64px;
  }

  .ei-platform h2,
  .ei-usecases h2,
  .ei-resource-heading h2 {
    font-size: 26px;
  }

  .ei-tabs {
    overflow-x: auto;
    grid-template-columns: repeat(5, minmax(140px, 1fr));
  }

  .ei-usecases {
    padding: 60px 0;
  }

  .ei-usecase-grid {
    grid-template-columns: 1fr;
    row-gap: 40px;
  }

  .ei-resources {
    padding: 60px 0;
  }

  .ei-resource-grid {
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .ei-resource-card,
  .ei-resource-card > img {
    width: 100%;
    max-width: 340px;
  }

  .ei-tech-zone-inner {
    flex-direction: column;
    align-items: flex-start;
    min-height: 0;
    padding: 48px 0;
    gap: 28px;
  }

  .ei-tech-zone h2 {
    font-size: 28px;
  }

  .ei-tech-zone p {
    font-size: 16px;
  }

  .ei-tech-zone img {
    align-self: center;
    width: min(60%, 260px);
  }
}