* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Pretendard", "Noto Sans KR", sans-serif;
  color: #10284a;
  background: #f4f4f4;
  word-break: keep-all;
}

a {
  text-decoration: none;
}

/* HEADER */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: background 0.3s ease, backdrop-filter 0.3s ease, border-color 0.3s ease;
}

.header.scrolled {
  background: rgba(10, 20, 35, 0.7);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.nav-inner {
  max-width: 1420px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo img {
  height: 36px;
  display: block;
}

.nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav a {
  position: relative;
  font-size: 17px;
  color: #cbd5e1;
  transition: color 0.25s ease;
}

.nav a:hover {
  color: #ffffff;
}


.nav-right {
  display: flex;
  align-items: center;
}

.btn-cso {
  padding: 12px 18px;
  border-radius: 8px;
  background: linear-gradient(135deg, #4f7cff, #3b5bdb);
  color: #fff !important;
  font-size: 14px !important;
  text-decoration: none;
  transition: 0.2s;
}

.btn-cso:hover {
  opacity: 0.9;
}
/*  */

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: none;
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px auto;
  background: #fff;
  transition: all 0.3s ease;
}

.mobile-nav {
  display: none;
}

/* VISUAL */
.sub-visual {
  position: relative;
  height: 360px;
  background:
    linear-gradient(rgba(10, 16, 28, 0.48), rgba(10, 16, 28, 0.48)),
    url("../assets/cso-visual.jpg") center center / cover no-repeat;
  overflow: hidden;
}

.sub-visual-overlay {
  position: absolute;
  inset: 0;
  background: rgba(4, 10, 20, 0.12);
}

.sub-visual-inner {
  position: relative;
  z-index: 2;
  max-width: 1420px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.sub-visual-inner h1 {
  margin: 0 0 6px;
  font-size: 40px;
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.04em;
}

.sub-visual-inner p {
  margin: 0;
  font-size: 24px;
  font-weight: 400;
  letter-spacing: 1px;
  color:#c2c2c2;
}

/* CSO SECTION */
.cso-section {
  position: relative;
  margin-top: -38px;
  padding: 0 0 90px;
}

.cso-wrap {
  max-width: 1420px;
  margin: 0 auto;
  padding: 80px 50px 40px;
  background: #f8f8f8;
  display: grid;
  grid-template-columns: 360px 1fr;
}

.section-label {
  margin: 0 0 20px;
  font-size: 16px;
  font-weight: 600;
  color: #3b82f6;
}
.cso-intro{
  position: relative;
}
.cso-intro::before{
  content: '';
  width: 60px; height: 60px;
  z-index: -1;
  border-radius: 999px;
  position: absolute;
  top: -20px; left: -20px;
  background: #f0f4ff;
}

.cso-intro h2 {
  margin: 30px 0 50px;
  font-size: 36px;
  font-weight: 500;
  color: #011532;
}

.cso-intro h2 span {
  font-weight: bold;
}

.cso-desc {
  font-size: 18px;
  line-height: 1.6;
  color: #b8b8b8;
}

/* 오른쪽 */
.feature-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 30px 24px 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 90px;
  row-gap: 56px;
}

.feature-card {
  position: relative;
  min-width: 0;
}

.feature-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 18px;
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.06);
  background: #2f4c67;
}

.feature-icon img {
  width: 26px;
  object-fit: contain;
}

.feature-number {
  font-size: 38px;
  font-weight: 300;
  line-height: 1;
  color: #dddddd;
  letter-spacing: -0.04em;
}

.feature-title {
  margin: 0 0 14px;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.45;
  color: #1f344e;
  letter-spacing: -0.03em;
  word-break: keep-all;
}

.feature-desc {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: #666666;
  word-break: keep-all;
  padding-right: 30px;
}

/* 태블릿 */
@media (max-width: 1024px) {
  .feature-grid {
    column-gap: 40px;
    row-gap: 44px;
  }

  .feature-title {
    font-size: 20px;
  }

  .feature-number {
    font-size: 32px;
  }
}

/* 모바일 */
@media (max-width: 768px) {
  .feature-grid-section {
    padding: 72px 0;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 0 20px;
  }

  .feature-card {
    padding-bottom: 8px;
    border-bottom: 1px solid #ebebeb;
  }

  .feature-card:last-child {
    border-bottom: none;
  }

  .feature-top {
    margin-bottom: 14px;
  }

  .feature-icon {
    width: 46px;
    height: 46px;
    border-radius: 14px;
  }

  .feature-icon img {
    width: 20px;
    height: 20px;
  }

  .feature-number {
    font-size: 26px;
  }

  .feature-title {
    font-size: 18px;
    margin-bottom: 10px;
  }

  .feature-desc {
    font-size: 13px;
    line-height: 1.75;
  }
  .cso-wrap {
  padding: 50px 20px 20px;
  grid-template-columns: 1fr;
}
}


/* FOOTER */
.footer {
  background: #081a34;
  padding: 22px 0 18px;
}

.footer-wrap {
  max-width: 1420px;
  margin: 0 auto;
  padding: 0 20px;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-logo img {
  display: block;
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: 34px;
}

.footer-nav a {
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.82);
  transition: color 0.25s ease;
}

.footer-nav a:hover {
  color: #ffffff;
}

.footer-line {
  margin: 16px 0 14px;
  height: 1px;
  background: rgba(255, 255, 255, 0.14);
}

.footer-bottom {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.footer-info p {
  margin: 0;
  font-size: 12px;
  line-height: 1.75;
  color: rgba(255,255,255,0.48);
}

.footer-copy {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: rgba(255,255,255,0.28);
  text-align: right;
  white-space: nowrap;
}

/* REVEAL */
.reveal-up {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal-up.show {
  opacity: 1;
  transform: translateY(0);
}