:root {
  --seo-navy: #080a32;
  --seo-indigo: #27234d;
  --seo-blue: #3460fc;
  --seo-mint: #5bd2b1;
  --seo-ink: #171824;
  --seo-muted: #676b7c;
  --seo-line: #e7e9f2;
  --seo-soft: #f5f7ff;
  --seo-white: #fff;
  --seo-radius: 22px;
  --seo-shadow: 0 24px 70px -42px rgba(19, 24, 73, .45);
}

.seo-deadline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 9px;
  margin: 22px 0 0;
  padding: 10px 16px;
  border: 1px solid rgba(255, 255, 255, .28);
  border-radius: 999px;
  background: rgba(10, 12, 50, .52);
  color: #fff;
  font-size: .92rem;
  font-weight: 700;
  text-align: center;
  backdrop-filter: blur(10px);
}

.seo-deadline a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.seo-deadline::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #78e4bf;
  box-shadow: 0 0 0 5px rgba(120, 228, 191, .16);
}

.seo-resource-section {
  padding: clamp(70px, 8vw, 110px) 0;
  background: linear-gradient(180deg, #fff, #f5f7ff);
}

.seo-resource-head {
  max-width: 790px;
  margin: 0 auto 38px;
  text-align: center;
}

.seo-resource-head .seo-kicker {
  display: inline-block;
  color: var(--seo-blue);
  font-weight: 800;
  font-size: .9rem;
  letter-spacing: .02em;
}

.seo-resource-head h2 {
  margin: 12px 0 14px;
  font-size: clamp(2rem, 4.4vw, 3.2rem);
  line-height: 1.15;
  letter-spacing: -.04em;
}

.seo-resource-head p {
  color: var(--seo-muted);
  font-size: 1.06rem;
}

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

.seo-resource-card {
  display: flex;
  min-height: 210px;
  flex-direction: column;
  padding: 28px;
  border: 1px solid var(--seo-line);
  border-radius: 20px;
  background: #fff;
  box-shadow: var(--seo-shadow);
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}

.seo-resource-card:hover {
  transform: translateY(-5px);
  border-color: rgba(52, 96, 252, .45);
  box-shadow: 0 28px 70px -38px rgba(52, 96, 252, .5);
}

.seo-resource-card small {
  color: var(--seo-blue);
  font-weight: 800;
}

.seo-resource-card h3 {
  margin: 10px 0;
  font-size: 1.28rem;
  line-height: 1.35;
}

.seo-resource-card p {
  margin: 0 0 18px;
  color: var(--seo-muted);
  font-size: .96rem;
}

.seo-resource-card b {
  margin-top: auto;
  color: var(--seo-blue);
  font-size: .92rem;
}

.seo-mobile-cta {
  display: none;
}

.seo-site {
  margin: 0;
  background: #fff;
  color: var(--seo-ink);
  font-family: "Pretendard Variable", Pretendard, Inter, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  word-break: keep-all;
  overflow-wrap: break-word;
}

.seo-site *, .seo-site *::before, .seo-site *::after { box-sizing: border-box; }
.seo-site a { color: inherit; text-decoration: none; }
.seo-site img { display: block; max-width: 100%; }
.seo-shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.seo-topbar {
  background: var(--seo-navy);
  color: rgba(255,255,255,.9);
}

.seo-topbar .seo-shell {
  display: flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  text-align: center;
  font-size: .9rem;
  font-weight: 700;
}

.seo-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--seo-line);
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(14px);
}

.seo-header .seo-shell {
  display: flex;
  min-height: 76px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.seo-brand { display: flex; align-items: center; gap: 10px; font-weight: 900; letter-spacing: -.03em; }
.seo-brand img:first-child { width: 36px; height: 36px; border-radius: 50%; }
.seo-brand img:last-child { width: 72px; height: auto; }
.seo-nav { display: flex; align-items: center; gap: 22px; font-size: .92rem; font-weight: 700; }
.seo-nav a:hover { color: var(--seo-blue); }
.seo-nav .seo-nav-cta { padding: 10px 17px; border-radius: 999px; background: var(--seo-blue); color: #fff; }
.seo-nav .seo-nav-cta:hover { color: #fff; filter: brightness(1.07); }

.seo-hero {
  padding: clamp(70px, 10vw, 118px) 0 clamp(64px, 8vw, 94px);
  background:
    radial-gradient(circle at 82% 15%, rgba(91, 210, 177, .19), transparent 28%),
    radial-gradient(circle at 18% 72%, rgba(80, 105, 255, .22), transparent 32%),
    linear-gradient(145deg, #080a32, #292253);
  color: #fff;
}

.seo-breadcrumb { margin-bottom: 22px; color: rgba(255,255,255,.66); font-size: .88rem; }
.seo-breadcrumb a:hover { color: #fff; }
.seo-label { display: inline-flex; padding: 7px 12px; border: 1px solid rgba(255,255,255,.22); border-radius: 999px; color: #aaf0d8; font-size: .85rem; font-weight: 800; }
.seo-hero h1 { max-width: 850px; margin: 20px 0; font-size: clamp(2.35rem, 6vw, 4.55rem); line-height: 1.1; letter-spacing: -.055em; }
.seo-hero p { max-width: 760px; margin: 0; color: rgba(255,255,255,.78); font-size: clamp(1.03rem, 2vw, 1.2rem); }
.seo-meta { display: flex; flex-wrap: wrap; gap: 10px 20px; margin-top: 25px; color: rgba(255,255,255,.64); font-size: .86rem; }
.seo-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.seo-button { display: inline-flex; min-height: 50px; align-items: center; justify-content: center; padding: 0 22px; border-radius: 999px; background: var(--seo-blue); color: #fff !important; font-weight: 800; }
.seo-button.alt { border: 1px solid rgba(255,255,255,.24); background: rgba(255,255,255,.08); }

.seo-main { padding: 64px 0 100px; }
.seo-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 54px; align-items: start; }
.seo-article h2 { margin: 58px 0 18px; font-size: clamp(1.65rem, 3vw, 2.3rem); line-height: 1.25; letter-spacing: -.04em; }
.seo-article h2:first-child { margin-top: 0; }
.seo-article h3 { margin: 30px 0 10px; font-size: 1.28rem; line-height: 1.4; }
.seo-article p { margin: 0 0 18px; color: #414553; }
.seo-article a:not(.seo-button) { color: #254fdd; text-decoration: underline; text-underline-offset: 3px; }
.seo-lead { padding: 24px 26px; border-left: 5px solid var(--seo-blue); border-radius: 0 16px 16px 0; background: var(--seo-soft); font-size: 1.08rem; }
.seo-note { padding: 20px 22px; border: 1px solid #dfe4ff; border-radius: 16px; background: #f7f8ff; color: #3d4568; }
.seo-warning { padding: 20px 22px; border: 1px solid #ffdfb2; border-radius: 16px; background: #fff9ef; color: #6c4d1f; }
.seo-checklist { display: grid; gap: 12px; margin: 22px 0; padding: 0; list-style: none; }
.seo-checklist li { position: relative; padding: 17px 18px 17px 52px; border: 1px solid var(--seo-line); border-radius: 15px; background: #fff; }
.seo-checklist li::before { content: "✓"; position: absolute; left: 18px; top: 17px; display: grid; width: 24px; height: 24px; place-items: center; border-radius: 50%; background: #e5f9f2; color: #168a69; font-weight: 900; }
.seo-table-wrap { overflow-x: auto; margin: 22px 0; border: 1px solid var(--seo-line); border-radius: 16px; }
.seo-table { width: 100%; border-collapse: collapse; min-width: 620px; }
.seo-table th, .seo-table td { padding: 15px 17px; border-bottom: 1px solid var(--seo-line); text-align: left; vertical-align: top; }
.seo-table th { background: #f3f5fc; font-size: .92rem; }
.seo-table tr:last-child td { border-bottom: 0; }
.seo-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 22px 0; }
.seo-card { padding: 24px; border: 1px solid var(--seo-line); border-radius: 18px; background: #fff; box-shadow: var(--seo-shadow); }
.seo-card h3 { margin-top: 0; }
.seo-card p:last-child { margin-bottom: 0; }
.seo-aside { position: sticky; top: 100px; }
.seo-aside-box { padding: 24px; border: 1px solid var(--seo-line); border-radius: 20px; background: #fff; box-shadow: var(--seo-shadow); }
.seo-aside-box + .seo-aside-box { margin-top: 16px; }
.seo-aside h2 { margin: 0 0 12px; font-size: 1.2rem; }
.seo-aside p { margin: 0 0 16px; color: var(--seo-muted); font-size: .93rem; }
.seo-aside ul { display: grid; gap: 9px; margin: 0; padding: 0; list-style: none; }
.seo-aside li a { color: #39405d; font-size: .92rem; }
.seo-aside li a:hover { color: var(--seo-blue); }
.seo-cta-box { margin-top: 58px; padding: 34px; border-radius: 24px; background: linear-gradient(135deg, #25204d, #0b0e3c); color: #fff; }
.seo-cta-box h2 { margin-top: 0; }
.seo-cta-box p { color: rgba(255,255,255,.72); }
.seo-portfolio-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.seo-portfolio-card { overflow: hidden; border: 1px solid var(--seo-line); border-radius: 18px; background: #fff; box-shadow: var(--seo-shadow); }
.seo-portfolio-card img { width: 100%; aspect-ratio: 16/10; object-fit: cover; object-position: top; background: #eef1fa; }
.seo-portfolio-card div { padding: 18px; }
.seo-portfolio-card h2 { margin: 0 0 5px; font-size: 1.08rem; }
.seo-portfolio-card span { color: var(--seo-muted); font-size: .88rem; }
.seo-footer { padding: 48px 0; background: var(--seo-navy); color: rgba(255,255,255,.7); }
.seo-footer .seo-shell { display: flex; justify-content: space-between; gap: 28px; flex-wrap: wrap; }
.seo-footer strong { display: block; color: #fff; margin-bottom: 7px; }
.seo-footer p { margin: 0; max-width: 620px; font-size: .9rem; }

@media (max-width: 900px) {
  .seo-resource-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .seo-layout { grid-template-columns: 1fr; }
  .seo-aside { position: static; }
  .seo-portfolio-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .seo-nav a:not(.seo-nav-cta) { display: none; }
}

@media (max-width: 640px) {
  .seo-resource-grid, .seo-cards, .seo-portfolio-grid { grid-template-columns: 1fr; }
  .seo-resource-card { min-height: 0; }
  .seo-shell { width: min(100% - 28px, 1120px); }
  .seo-topbar .seo-shell { padding: 8px 0; font-size: .82rem; }
  .seo-header .seo-shell { min-height: 66px; }
  .seo-nav-cta { font-size: .86rem; }
  .seo-main { padding: 46px 0 90px; }
  .seo-mobile-cta { position: fixed; z-index: 80; right: 12px; bottom: 12px; left: 12px; display: grid; grid-template-columns: 1fr 1.4fr; gap: 8px; padding: 8px; border: 1px solid rgba(255,255,255,.14); border-radius: 18px; background: rgba(8,10,50,.94); box-shadow: 0 16px 42px rgba(0,0,0,.28); backdrop-filter: blur(14px); }
  .seo-mobile-cta a { display: flex; min-height: 48px; align-items: center; justify-content: center; border-radius: 12px; color: #fff; font-weight: 800; }
  .seo-mobile-cta a:last-child { background: var(--seo-blue); }
  .seo-site { padding-bottom: 76px; }
}

@media (prefers-reduced-motion: reduce) {
  .seo-resource-card { transition: none; }
}