:root {
  --ink: #17202a;
  --muted: #5c6673;
  --line: #dce2ea;
  --paper: #ffffff;
  --soft: #f5f8fc;
  --navy: #0f2d4a;
  --navy-2: #071b2d;
  --blue: #1769aa;
  --green: #1f8a5b;
  --amber: #d89222;
  --red: #c6534a;
  --shadow: 0 18px 55px rgba(10, 28, 45, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, "Noto Sans KR", "Malgun Gothic", sans-serif;
  line-height: 1.65;
}

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

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

button,
input,
select,
textarea {
  font: inherit;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 1000;
  padding: 10px 14px;
  background: #fff;
  border: 1px solid var(--ink);
}

.skip-link:focus {
  top: 16px;
}

.wrap {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.topline {
  background: var(--navy-2);
  color: #fff;
  font-size: 13px;
}

.topline .wrap {
  min-height: 38px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topline a {
  color: rgba(255,255,255,0.86);
  margin-left: 14px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(15,45,74,0.12);
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(12px);
}

.nav-wrap {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 250px;
}

.brand img {
  width: 152px;
  height: auto;
  max-height: 48px;
  object-fit: contain;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  display: none;
}

.brand small {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 700;
}

.main-nav a:hover,
.footer-grid a:hover {
  color: var(--blue);
}

.nav-cta,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 7px;
  border: 1px solid transparent;
  font-weight: 800;
  cursor: pointer;
}

.nav-cta,
.btn.primary {
  background: var(--green);
  color: #fff;
}

.btn.secondary {
  color: var(--navy);
  border-color: rgba(15,45,74,0.22);
  background: #fff;
}

.btn.dark {
  background: var(--navy);
  color: #fff;
}

.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(120deg, var(--navy-2), var(--navy));
  color: #fff;
}

.hero-grid {
  min-height: 670px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.82fr);
  gap: 44px;
  align-items: center;
  padding: 72px 0 62px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0;
}

.hero .eyebrow {
  color: #75c9ff;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.18;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  font-size: 54px;
}

.hero-lead {
  max-width: 690px;
  margin: 24px 0 0;
  color: rgba(255,255,255,0.82);
  font-size: 19px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.proof-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 12px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
}

.proof-strip li {
  padding: 17px;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 8px;
  background: rgba(255,255,255,0.08);
}

.proof-strip strong,
.proof-strip span {
  display: block;
}

.proof-strip span {
  margin-top: 5px;
  color: rgba(255,255,255,0.72);
  font-size: 14px;
}

.hero-visual {
  overflow: hidden;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 30px 90px rgba(0,0,0,0.28);
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.hero-product-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: #fff;
  overflow: hidden;
}

.hero-product-pair img {
  aspect-ratio: 1 / 1;
  object-fit: contain;
  padding: 18px;
}

.hero-visual figcaption {
  padding: 18px 20px;
  color: var(--ink);
  font-weight: 800;
}

.quick-bar {
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.quick-grid a {
  min-height: 66px;
  display: grid;
  place-items: center;
  border-left: 1px solid var(--line);
  color: var(--navy);
  font-weight: 900;
  text-align: center;
}

.quick-grid a:last-child {
  border-right: 1px solid var(--line);
}

.section {
  padding: 86px 0;
}

.section.compact {
  padding: 64px 0;
}

.band {
  background: var(--soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head {
  max-width: 820px;
  margin-bottom: 32px;
}

.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-head h2,
.split h2,
.article h1 {
  font-size: 38px;
}

.section-head p,
.split p,
.article-intro,
.muted {
  color: var(--muted);
}

.section-head p,
.split p,
.article-intro {
  margin: 15px 0 0;
  font-size: 17px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.product-card,
.info-card,
.channel-card,
.review-card,
.article,
.toc,
.table-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  box-shadow: var(--shadow);
}

.product-card {
  overflow: hidden;
  display: grid;
}

.product-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  padding: 18px;
  background: #fff;
}

.product-card .body {
  padding: 20px;
  border-top: 1px solid var(--line);
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 27px;
  padding: 0 9px;
  border-radius: 999px;
  background: #eaf6ef;
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
}

.product-card h3 {
  margin-top: 12px;
  font-size: 23px;
}

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

.product-card .btn {
  width: 100%;
  margin-top: 10px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 44px;
  align-items: center;
}

.split img {
  width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
}

.check-list strong {
  color: var(--ink);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.info-card {
  padding: 24px;
}

.info-card h3 {
  font-size: 22px;
}

.info-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.contact-band {
  background: var(--navy);
  color: #fff;
}

.contact-band .section-head p {
  color: rgba(255,255,255,0.72);
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0,1fr));
  gap: 16px;
}

.channel-card {
  padding: 22px;
  box-shadow: none;
  color: var(--ink);
}

.channel-card strong {
  display: block;
  color: var(--ink);
  font-size: 19px;
}

.channel-card span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
}

.channel-card.primary-channel {
  border-color: rgba(31,138,91,0.35);
  background: #f0fbf5;
}

.contact-band .channel-card {
  color: var(--ink);
}

.breadcrumbs {
  padding: 22px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumbs a {
  color: var(--blue);
}

.page-hero {
  padding: 58px 0 66px;
  background: linear-gradient(120deg, #eef5fb, #fff);
  border-bottom: 1px solid var(--line);
}

.page-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 38px;
  align-items: center;
}

.page-hero h1 {
  color: var(--navy);
}

.page-hero img {
  width: 100%;
  max-height: 360px;
  object-fit: contain;
  padding: 18px;
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--shadow);
}

.article-layout {
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 96px;
  padding: 22px;
  box-shadow: none;
}

.toc strong {
  display: block;
  margin-bottom: 12px;
}

.toc a {
  display: block;
  padding: 8px 0;
  color: var(--muted);
}

.article {
  padding: 34px;
}

.article h2 {
  margin-top: 34px;
  font-size: 28px;
}

.article h2:first-child {
  margin-top: 0;
}

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

.article ul {
  color: var(--muted);
}

.article li + li {
  margin-top: 8px;
}

.notice-box,
.cta-panel {
  margin: 24px 0;
  padding: 22px;
  border: 1px solid rgba(23,105,170,0.2);
  border-radius: 10px;
  background: #f3f8fc;
}

.notice-box strong,
.cta-panel strong {
  display: block;
  color: var(--navy);
  font-size: 18px;
}

.notice-box p,
.cta-panel p {
  margin-bottom: 0;
}

.step-grid,
.related-grid,
.metric-grid {
  display: grid;
  gap: 14px;
}

.step-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 24px 0;
}

.step-card,
.related-card,
.metric-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.step-card {
  padding: 18px;
}

.step-card span,
.metric-card span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  min-height: 34px;
  margin-bottom: 10px;
  border-radius: 999px;
  background: #eaf6ef;
  color: var(--green);
  font-weight: 900;
}

.step-card h3,
.metric-card h3 {
  margin: 0;
  font-size: 18px;
}

.step-card p,
.metric-card p {
  margin-bottom: 0;
  font-size: 15px;
}

.related-grid,
.metric-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 20px;
}

.related-card,
.metric-card {
  padding: 20px;
}

.related-card strong {
  display: block;
  color: var(--navy);
  font-size: 18px;
}

.related-card span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
}

.cta-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.cta-panel p {
  margin-top: 6px;
}

.table-card {
  overflow: hidden;
  box-shadow: none;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 15px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--soft);
  color: var(--navy);
}

.faq-list {
  display: grid;
  gap: 12px;
}

details {
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
}

summary {
  cursor: pointer;
  padding: 18px 20px;
  color: var(--navy);
  font-weight: 900;
}

details p {
  margin: 0;
  padding: 0 20px 20px;
  color: var(--muted);
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.review-card {
  padding: 22px;
}

.stars {
  color: var(--amber);
  font-weight: 900;
}

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

.review-card cite {
  color: var(--ink);
  font-style: normal;
  font-weight: 900;
}

.site-footer {
  background: var(--navy-2);
  color: #fff;
  padding: 46px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: start;
}

.footer-grid strong {
  display: block;
  font-size: 22px;
}

.footer-grid p {
  max-width: 650px;
  color: rgba(255,255,255,0.68);
}

.footer-grid nav {
  display: grid;
  gap: 9px;
  color: rgba(255,255,255,0.76);
}

.disclaimer {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,0.14);
  color: rgba(255,255,255,0.62);
  font-size: 13px;
}

@media (max-width: 1040px) {
  .main-nav {
    display: none;
  }

  .hero-grid,
  .split,
  .page-hero-grid,
  .article-layout {
    grid-template-columns: 1fr;
  }

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

  .info-grid,
  .review-grid,
  .step-grid,
  .related-grid,
  .metric-grid,
  .quick-grid {
    grid-template-columns: repeat(2, minmax(0,1fr));
  }

  .toc {
    position: static;
  }

  h1 {
    font-size: 42px;
  }
}

@media (max-width: 640px) {
  .wrap {
    width: min(100% - 28px, 1180px);
  }

  .topline .wrap {
    align-items: flex-start;
    flex-direction: column;
    padding: 10px 0;
  }

  .topline a {
    margin: 0 12px 0 0;
  }

  .brand {
    min-width: 0;
  }

  .brand small,
  .nav-cta {
    display: none;
  }

  .hero-grid {
    min-height: 0;
    padding: 48px 0;
  }

  h1 {
    font-size: 34px;
  }

  .hero-lead {
    font-size: 17px;
  }

  .proof-strip {
    display: none;
  }

  .hero-visual {
    margin-top: 8px;
  }

  .hero-product-pair img {
    padding: 10px;
  }

  .hero-visual figcaption {
    padding: 14px 16px;
    font-size: 14px;
  }

  .hero-actions,
  .product-grid,
  .info-grid,
  .channel-grid,
  .review-grid,
  .step-grid,
  .related-grid,
  .metric-grid,
  .quick-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .cta-panel {
    align-items: stretch;
    flex-direction: column;
  }

  .btn,
  .hero-actions .btn {
    width: 100%;
  }

  .quick-grid a,
  .quick-grid a:last-child {
    border-right: 1px solid var(--line);
  }

  .section {
    padding: 58px 0;
  }

  .section-head h2,
  .split h2,
  .article h1 {
    font-size: 30px;
  }

  .article {
    padding: 24px;
  }

  th,
  td {
    padding: 12px;
  }
}