:root {
  --bg: #ffffff;
  --surface: #f7f9fc;
  --surface-strong: #eef4ff;
  --text: #172033;
  --muted: #5f6b7a;
  --line: #dce3ee;
  --main: #2563eb;
  --sub: #14b8a6;
  --accent: #f97316;
  --violet: #7c3aed;
  --ok: #0f766e;
  --danger: #b42318;
  --shadow: 0 18px 40px rgba(17, 31, 54, 0.08);
  --radius: 8px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  word-break: keep-all;
}

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

img,
svg {
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}

.header-inner,
.container {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}

.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: var(--main);
  color: #fff;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  color: #344156;
  font-size: 15px;
}

.site-nav a {
  padding: 8px 0;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 70px 0 52px;
  border-bottom: 1px solid var(--line);
  background: #fbfdff;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.9) 45%, rgba(255, 255, 255, 0.28) 73%, rgba(255, 255, 255, 0.1) 100%),
    linear-gradient(180deg, rgba(251, 253, 255, 0.2), rgba(251, 253, 255, 0.78));
}

.hero-bg-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center right;
}

.hero-grid {
  position: relative;
  z-index: 1;
  min-height: 390px;
  display: flex;
  align-items: center;
}

.hero-copy {
  max-width: 690px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--ok);
  font-weight: 800;
  font-size: 14px;
}

h1,
h2,
h3 {
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 5vw, 58px);
}

h2 {
  margin: 0 0 16px;
  font-size: 28px;
}

h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.lead {
  margin: 18px 0 0;
  color: #3e4a5e;
  font-size: 18px;
  max-width: 680px;
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.btn,
button.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--text);
  font-weight: 800;
  cursor: pointer;
}

.btn.primary {
  border-color: var(--main);
  background: var(--main);
  color: #fff;
}

.btn.subtle {
  background: var(--surface);
}

.visual-panel {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.visual-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px;
  border-bottom: 1px solid var(--line);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--main);
}

.dot:nth-child(2) {
  background: var(--sub);
}

.dot:nth-child(3) {
  background: var(--accent);
}

.visual-list {
  display: grid;
  gap: 12px;
  padding: 18px;
}

.visual-item {
  display: grid;
  grid-template-columns: 46px 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfdff;
}

.visual-icon,
.icon-box {
  width: 42px;
  height: 42px;
  border-radius: var(--radius);
  display: grid;
  place-items: center;
  background: var(--surface-strong);
  color: var(--main);
  font-weight: 900;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 9px;
  border-radius: 999px;
  background: #eef4ff;
  color: #1d4ed8;
  font-size: 13px;
  font-weight: 800;
}

.section {
  padding: 48px 0;
}

.section.alt {
  background: var(--surface);
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 24px;
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 18px;
}

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

.grid.cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 18px;
}

.card:hover {
  border-color: #b8c8e2;
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.06);
}

.post-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 100%;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  color: var(--muted);
  font-size: 13px;
}

.category-band {
  padding: 42px 0;
  border-bottom: 1px solid var(--line);
  background: #fbfdff;
}

.hub-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 32px;
}

.hub-panel,
.next-read-box {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 18px;
}

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

.compact-link-list {
  display: grid;
  gap: 8px;
}

.compact-link-list a {
  display: block;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: #1d4ed8;
  font-weight: 800;
}

.compact-link-list a:hover {
  border-color: #b8c8e2;
  background: #eef4ff;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--main);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 34px;
  align-items: start;
}

.article {
  max-width: 790px;
}

.article h1 {
  font-size: clamp(30px, 4vw, 48px);
}

.article-body h2 {
  margin-top: 34px;
}

.summary-box,
.notice-box {
  border: 1px solid var(--line);
  border-left: 4px solid var(--sub);
  border-radius: var(--radius);
  background: #f8fffd;
  padding: 16px;
  margin: 24px 0;
}

.toc {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.toc ol {
  margin: 8px 0 0;
  padding-left: 20px;
}

.comparison-box {
  margin: 24px 0;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

th,
td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface);
  color: #243447;
  font-weight: 900;
}

tr:last-child td {
  border-bottom: 0;
}

.next-read-box {
  margin: 22px 0;
  background: #fbfdff;
}

.next-read-box strong {
  display: block;
  margin-bottom: 10px;
}

.tool-progress {
  margin: 24px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.progress-track {
  height: 10px;
  margin-top: 10px;
  border-radius: 999px;
  background: var(--surface);
  overflow: hidden;
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--sub);
  transition: width 0.2s ease;
}

.tool-checklist {
  display: grid;
  gap: 22px;
}

.glossary-group + .glossary-group {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.tool-section {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.check-item {
  display: grid;
  grid-template-columns: 20px 1fr;
  align-items: start;
  gap: 10px;
  padding: 10px 0;
  color: var(--text);
  font-weight: 700;
}

.check-item + .check-item {
  border-top: 1px solid var(--line);
}

.check-item input {
  width: 18px;
  height: 18px;
  margin-top: 4px;
  accent-color: var(--sub);
}

.ad-section {
  padding: 18px 0 0;
}

.ad-slot {
  width: 100%;
  min-height: 96px;
  display: grid;
  place-items: center;
  gap: 6px;
  overflow: hidden;
  margin: 24px 0;
  border: 1px solid transparent;
  text-align: center;
}

.ad-slot.preview {
  border-color: var(--line);
  border-radius: var(--radius);
  background: #fbfdff;
  color: var(--muted);
  padding: 18px;
}

.ad-slot.wide {
  margin: 0;
}

.ad-slot.in-article {
  min-height: 240px;
}

.ad-slot.sidebar-ad {
  min-height: 250px;
  margin: 0 0 22px;
}

.ad-label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.adsbygoogle {
  width: 100%;
  min-width: 250px;
}

.side-panel {
  position: sticky;
  top: 92px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  background: #fff;
}

.list {
  padding-left: 20px;
}

.list li + li {
  margin-top: 6px;
}

.faq-item {
  border-top: 1px solid var(--line);
  padding: 14px 0;
}

.author-box {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 14px;
  align-items: start;
  margin-top: 28px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.avatar {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--text);
  color: #fff;
  font-weight: 900;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #101828;
  color: #f8fafc;
  padding: 34px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 24px;
}

.site-footer a {
  color: #dbeafe;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.admin-shell {
  min-height: calc(100vh - 68px);
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  background: var(--surface);
}

.admin-sidebar {
  border-right: 1px solid var(--line);
  background: #111827;
  color: #fff;
  padding: 18px;
}

.admin-sidebar a,
.admin-sidebar button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  min-height: 42px;
  border: 0;
  border-radius: var(--radius);
  background: transparent;
  color: #e5e7eb;
  padding: 10px 12px;
  font-weight: 700;
  cursor: pointer;
}

.admin-sidebar button.active {
  background: #263244;
  color: #fff;
}

.admin-main {
  padding: 24px;
}

.admin-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 20px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.settings-group {
  margin-top: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

label {
  display: grid;
  gap: 6px;
  color: #344156;
  font-weight: 800;
  font-size: 14px;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 11px 12px;
  font: inherit;
  color: var(--text);
  background: #fff;
}

textarea {
  min-height: 140px;
  resize: vertical;
}

.full {
  grid-column: 1 / -1;
}

.table-list {
  display: grid;
  gap: 10px;
}

.row-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: #fff;
}

.login-panel {
  max-width: 520px;
  margin: 56px auto;
}

.status-note {
  color: var(--muted);
  font-size: 14px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 12px;
  z-index: 999;
  background: #fff;
  padding: 10px;
}

.skip-link:focus {
  left: 12px;
}

@media (max-width: 900px) {
  .article-layout,
  .footer-grid,
  .hub-grid,
  .grid.cols-3,
  .grid.cols-4,
  .admin-shell,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .site-nav {
    display: none;
    position: absolute;
    inset: 68px 0 auto 0;
    padding: 14px 16px;
    border-bottom: 1px solid var(--line);
    background: #fff;
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav.open {
    display: flex;
  }

  .nav-toggle {
    display: inline-grid;
    place-items: center;
  }

  .side-panel {
    position: static;
  }

  .admin-sidebar {
    border-right: 0;
  }

  .hero::after {
    background:
      linear-gradient(90deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.94) 56%, rgba(255, 255, 255, 0.66) 100%),
      linear-gradient(180deg, rgba(251, 253, 255, 0.1), rgba(251, 253, 255, 0.88));
  }
}

@media (max-width: 560px) {
  .header-inner,
  .container {
    width: min(100% - 22px, var(--max));
  }

  .hero {
    padding: 38px 0 34px;
  }

  .hero-bg-image {
    object-position: 58% center;
  }

  .hero-grid {
    min-height: 360px;
  }

  h1 {
    font-size: 32px;
  }

  .section {
    padding: 34px 0;
  }

  .visual-item,
  .author-box,
  .row-card {
    grid-template-columns: 1fr;
  }
}