:root {
  --iu-navy: #061018;
  --iu-blue: #2563eb;
  --iu-blue-deep: #123c92;
  --iu-blue-soft: #3b82f6;
  --iu-line: #d7e2ef;
  --iu-bg: #f5f8fc;
  --iu-bg-soft: #eef4fb;
  --iu-panel: #ffffff;
  --iu-text: #152033;
  --iu-muted: #5b6b82;
  --iu-shadow: 0 16px 42px rgba(15, 33, 61, 0.08);
  --iu-fs-min: 20px;
  --iu-guest-fs-min: 20px;
}

html {
  font-size: 20px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
}

.iu-guest-body {
  min-height: 100vh;
  background: linear-gradient(180deg, #f7faff 0%, #f4f7fb 100%);
  color: var(--iu-text);
  font-size: 20px;
  font-family: "Pretendard", "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
}

.iu-guest-body .small,
.iu-guest-body small,
.iu-guest-body .form-text {
  font-size: var(--iu-guest-fs-min) !important;
  line-height: 1.45;
}

.iu-guest-body .iu-business-footer,
.iu-guest-body .iu-business-footer.small,
.iu-guest-body .iu-business-footer .small {
  font-size: 18px !important;
  line-height: 1.45;
}

.iu-guest-view {
  display: none;
}

.iu-guest-view.is-active {
  display: block;
}

.iu-guest-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.iu-guest-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(247, 250, 255, 0.92);
  border-bottom: 1px solid rgba(215, 226, 239, 0.88);
}

.iu-guest-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 78px;
}

.iu-hero-brand {
  display: inline-flex;
  flex-direction: column;
  gap: 6px;
}

.iu-hero-brand-inline {
  align-items: flex-start;
}

.iu-hero-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--iu-text);
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
}

.iu-hero-lockup-center {
  justify-content: center;
}

.iu-hero-logo {
  display: block;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: contain;
  flex: 0 0 auto;
}

.iu-hero-brand-ko {
  display: block;
  color: var(--iu-muted);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.iu-hero-lockup-center + .iu-hero-brand-ko {
  margin-top: 8px;
}

.iu-guest-menu {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.iu-guest-menu a {
  color: var(--iu-text);
  text-decoration: none;
  font-size: 20px;
  font-weight: 600;
}

.iu-guest-menu a:hover {
  color: var(--iu-blue);
}

.iu-guest-menu a.iu-guest-login-btn,
.iu-guest-menu a.iu-guest-login-btn:hover,
.iu-guest-menu a.iu-guest-login-btn:focus {
  color: #fff;
}

.iu-guest-login-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding-inline: 1rem;
}

.iu-guest-menu-toggle {
  display: none;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 1px solid var(--iu-line);
  border-radius: 14px;
  background: #fff;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.iu-guest-menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: var(--iu-text);
}

.iu-hero {
  padding: 3.5rem 0 2.5rem;
}

.iu-hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: 1.5rem;
  align-items: stretch;
}

.iu-hero-copy,
.iu-hero-side {
  min-width: 0;
}

.iu-hero-copy {
  padding: 1rem 0 0;
}

.iu-hero-eyebrow {
  margin: 0 0 0.9rem;
  color: var(--iu-blue-soft);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.iu-hero-title {
  margin: 0 0 1rem;
  color: var(--iu-text);
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.035em;
}

.iu-hero-title-xl {
  font-size: clamp(30px, 5vw, 50px);
  line-height: 1.08;
  max-width: none;
}

.iu-hero-lead {
  max-width: 760px;
  margin: 0 0 0.85rem;
  color: var(--iu-muted);
  font-size: clamp(20px, 1.9vw, 22px);
  line-height: 1.72;
  font-weight: 500;
}

.iu-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.iu-hero-actions .btn {
  flex: 0 1 auto;
}

.iu-hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.iu-hero-trust span {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0.45rem 0.8rem;
  border: 1px solid #d6e1f2;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--iu-blue-deep);
  font-size: 20px;
  font-weight: 700;
}


.iu-side-card,
.iu-copy-card,
.iu-contact-panel,
.iu-subpage {
  background: var(--iu-panel);
  border: 1px solid var(--iu-line);
  border-radius: 24px;
  box-shadow: var(--iu-shadow);
}

.iu-side-card {
  height: 100%;
  padding: 1.6rem;
  background: linear-gradient(180deg, #0e2140 0%, #153665 100%);
  border-color: #18375f;
}

.iu-side-card-label {
  margin: 0 0 1rem;
  color: var(--iu-blue-soft);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.iu-side-card .iu-side-card-label {
  color: #9fc0ff;
}

.iu-solution-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.iu-solution-list li {
  padding: 0.95rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  color: #f8fbff;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
}

.iu-solution-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.iu-guest-section {
  padding: 4rem 0;
  border-top: 1px solid rgba(215, 226, 239, 0.9);
}

.iu-guest-section-last {
  padding-bottom: 5rem;
}

.iu-section-heading {
  max-width: none;
  margin-bottom: 1.8rem;
}

.iu-section-title {
  margin: 0;
  color: var(--iu-text);
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.03em;
  word-break: keep-all;
}

.iu-section-lead {
  margin: 0.9rem 0 0;
  color: var(--iu-muted);
  font-size: 20px;
  line-height: 1.7;
}

.iu-two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.iu-copy-card {
  padding: 1.6rem;
}

.iu-copy-card p:last-child {
  margin-bottom: 0;
}

.iu-copy-card p {
  color: var(--iu-text);
  font-size: 20px;
  line-height: 1.75;
}

.iu-copy-emphasis {
  margin-top: 1.1rem;
  color: var(--iu-blue-deep);
  font-weight: 800;
}

.iu-check-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.iu-check-list li {
  position: relative;
  padding: 0.4rem 0 0.4rem 0.8rem;
  border-top: 1px solid #e7eef7;
  color: var(--iu-text);
  font-size: 20px;
  line-height: 1.55;
}

.iu-check-list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.iu-check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.2rem;
  width: 0.48rem;
  height: 0.48rem;
  border-radius: 50%;
  background: var(--iu-blue);
}

.iu-check-list li:first-child::before {
  top: 0.42rem;
}

.iu-solution-grid,
.iu-service-grid,
.iu-support-grid {
  display: grid;
  gap: 1.1rem;
}

.iu-solution-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 1.1rem;
}

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

.iu-feature-card {
  padding: 1.4rem;
  background: #fff;
  border: 1px solid var(--iu-line);
  border-radius: 22px;
  box-shadow: 0 12px 30px rgba(15, 33, 61, 0.05);
}

.iu-feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin-bottom: 1rem;
  border-radius: 16px;
  background: #eef4ff;
  color: var(--iu-blue);
  font-size: 22px;
}

.iu-feature-card h3,
.iu-card-title {
  margin: 0 0 0.65rem;
  color: var(--iu-text);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.iu-feature-card p,
.iu-copy-card p,
.iu-support-link span,
.iu-contact-copy {
  margin: 0;
  color: var(--iu-muted);
  font-size: 20px;
  line-height: 1.7;
}

.iu-contact-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 1.4rem;
  padding: 1.6rem;
}

.iu-contact-actions {
  display: grid;
  gap: 0.75rem;
  align-content: start;
}

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

.iu-support-link {
  display: block;
  padding: 1.35rem;
  background: #fff;
  border: 1px solid var(--iu-line);
  border-radius: 20px;
  color: inherit;
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(15, 33, 61, 0.04);
}

.iu-support-link strong {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--iu-text);
  font-size: 20px;
}

.iu-support-link:hover {
  border-color: #b8cbeb;
  transform: translateY(-1px);
}

.btn-iu-primary {
  --bs-btn-color: #fff;
  --bs-btn-bg: var(--iu-blue);
  --bs-btn-border-color: var(--iu-blue);
  --bs-btn-hover-color: #fff;
  --bs-btn-hover-bg: #1e55c9;
  --bs-btn-hover-border-color: #1e55c9;
  --bs-btn-active-color: #fff;
  --bs-btn-active-bg: #173f9a;
  --bs-btn-active-border-color: #173f9a;
  font-weight: 700;
  white-space: nowrap;
}

.btn-iu-ghost {
  --bs-btn-color: var(--iu-blue-deep);
  --bs-btn-bg: #fff;
  --bs-btn-border-color: #9db7de;
  --bs-btn-hover-color: #fff;
  --bs-btn-hover-bg: var(--iu-blue);
  --bs-btn-hover-border-color: var(--iu-blue);
  --bs-btn-active-color: #fff;
  --bs-btn-active-bg: #173f9a;
  --bs-btn-active-border-color: #173f9a;
  font-weight: 700;
  white-space: nowrap;
}

.btn-lg {
  min-height: 52px;
  padding: 0.8rem 1.15rem;
}

.iu-subpage {
  padding: 1.65rem;
  color: var(--iu-text);
}

.iu-subpage .text-white {
  color: var(--iu-text) !important;
}

.iu-auth-code {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--iu-text);
}

.iu-guest-footer {
  border-top: 1px solid #d7e2ef;
  background: #fff;
}

.iu-guest-footer a:hover {
  color: var(--iu-blue) !important;
}

@media (max-width: 991.98px) {
  .iu-guest-shell {
    width: min(100% - 24px, 100%);
  }

  .iu-guest-menu-toggle {
    display: inline-flex;
  }

  .iu-guest-menu {
    position: absolute;
    left: 12px;
    right: 12px;
    top: calc(100% + 8px);
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem;
    border: 1px solid var(--iu-line);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--iu-shadow);
  }

  .iu-guest-menu.is-open {
    display: flex;
  }

  .iu-guest-menu a {
    padding: 0.9rem 0.8rem;
    border-radius: 14px;
  }

  .iu-guest-menu .iu-guest-login-btn {
    margin-top: 0.35rem;
  }

  .iu-hero {
    padding-top: 1.5rem;
    padding-bottom: 1.5rem;
  }

  .iu-hero-layout,
  .iu-two-col,
  .iu-contact-panel,
  .iu-solution-grid,
  .iu-service-grid,
  .iu-support-grid {
    grid-template-columns: 1fr;
  }

  .iu-hero-title-xl {
    max-width: none;
    font-size: clamp(30px, 8vw, 42px);
  }

  .iu-hero-lead {
    font-size: 20px;
    line-height: 1.62;
  }

  .iu-hero-trust {
    gap: 0.55rem;
    margin-top: 1.15rem;
  }

  .iu-copy-card,
  .iu-feature-card,
  .iu-side-card,
  .iu-contact-panel,
  .iu-subpage {
    border-radius: 20px;
  }

  .iu-guest-section {
    padding: 3rem 0;
  }

  .iu-section-heading {
    margin-bottom: 1.25rem;
  }
}

@media (max-width: 575.98px) {
  .iu-guest-shell {
    width: calc(100% - 20px);
  }

  .iu-guest-nav-inner {
    min-height: 68px;
  }

  .iu-guest-menu {
    left: 10px;
    right: 10px;
  }

  .iu-hero {
    padding-top: 1rem;
    padding-bottom: 1.25rem;
  }

  .iu-hero-lockup {
    font-size: 27px;
  }

  .iu-hero-copy {
    padding-top: 0.2rem;
  }

  .iu-hero-actions {
    display: grid;
  }

  .iu-hero-trust span {
    width: 100%;
    justify-content: center;
    min-height: 36px;
    padding: 0.42rem 0.7rem;
    font-size: 20px;
  }

  .iu-side-card,
  .iu-copy-card,
  .iu-feature-card,
  .iu-contact-panel,
  .iu-subpage,
  .iu-support-link {
    padding: 1.1rem;
    border-radius: 18px;
  }

  .iu-guest-section {
    padding: 2.35rem 0;
  }

  .iu-guest-section-last {
    padding-bottom: 3rem;
  }

  .iu-section-title {
    font-size: 28px;
    line-height: 1.18;
  }

  .iu-section-lead,
  .iu-feature-card p,
  .iu-copy-card p,
  .iu-support-link span,
  .iu-contact-copy,
  .iu-check-list li {
    font-size: 20px;
    line-height: 1.6;
  }

  .iu-solution-list li {
    font-size: 20px;
    line-height: 1.4;
    padding: 0.8rem 0;
  }

  .iu-contact-actions {
    gap: 0.6rem;
  }

  .iu-feature-card h3,
  .iu-card-title,
  .iu-support-link strong {
    font-size: 20px;
  }

  .btn-lg {
    min-height: 50px;
    padding: 0.78rem 1rem;
  }
}