/* ── RESET & VARIABLES ───────────────────────────────────────── */
:root {
  --bg:      #0b0f19;
  --panel:   #111827;
  --border:  #1f2d40;
  --border2: #263348;
  --text:    #e2e8f0;
  --muted:   #64748b;
  --cyan:    #00d4ff;
  --cyan2:   #0ea5e9;
  --amber:   #f59e0b;
  --green:   #10b981;
  --purple:  #a78bfa;
  --red:     #f87171;
  --orange:  #fb923c;
  --mono:    'JetBrains Mono', monospace;
  --sans:    'Plus Jakarta Sans', sans-serif;
}
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── HEADER ─────────────────────────────────────────────────── */
header {
  position: sticky; top: 0; z-index: 50;
  display: grid; grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 28px; height: 52px;
  background: rgba(11,15,25,.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}
.logo {
  font-family: var(--mono); font-size: .9rem; font-weight: 700;
  color: var(--cyan); letter-spacing: 3px;
  display: flex; align-items: center; gap: 8px;
  text-decoration: none;
}
.logo span { color: var(--muted); }
.logo-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 8px var(--cyan);
  animation: blink 2s ease-in-out infinite;
}
@keyframes blink {
  0%,100% { opacity: 1; } 50% { opacity: .4; }
}
nav { display: flex; align-items: center; gap: 20px; justify-content: center; }
nav a {
  font-family: var(--mono); font-size: .65rem; font-weight: 500;
  color: var(--muted); text-decoration: none;
  letter-spacing: .5px; transition: color .2s;
}
nav a:hover { color: var(--cyan); }
.lang-switcher { position: relative; display: flex; align-items: center; justify-content: flex-end; }
.lang-toggle { display: flex; align-items: center; gap: 5px; background: transparent; border: 1px solid var(--border2); font-family: var(--mono); font-size: .62rem; font-weight: 700; color: var(--muted); cursor: pointer; padding: 4px 9px; border-radius: 6px; transition: all .2s; letter-spacing: .5px; }
.lang-toggle:hover, .lang-toggle.open { color: var(--cyan); border-color: rgba(0,212,255,.4); }
.lang-caret { transition: transform .2s; }
.lang-toggle.open .lang-caret { transform: rotate(180deg); }
.lang-dropdown { display: none; position: absolute; top: calc(100% + 8px); right: 0; background: var(--panel); border: 1px solid var(--border2); border-radius: 10px; padding: 6px; min-width: 150px; z-index: 200; box-shadow: 0 8px 24px rgba(0,0,0,.4); }
.lang-dropdown.open { display: block; }
.lang-item { display: block; font-family: var(--mono); font-size: .65rem; color: var(--muted); text-decoration: none; padding: 7px 10px; border-radius: 6px; transition: all .2s; white-space: nowrap; }
.lang-item:hover { background: var(--border); color: var(--text); }
.lang-item.active { color: var(--cyan); background: rgba(0,212,255,.08); }

/* ── FOOTER ─────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  margin-top: 0;
}
.footer-logo {
  font-family: var(--mono); font-size: .85rem; font-weight: 700;
  color: var(--cyan); letter-spacing: 3px;
}
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; }
.footer-links a {
  font-family: var(--mono); font-size: .65rem;
  color: var(--muted); text-decoration: none; transition: color .2s;
}
.footer-links a:hover { color: var(--cyan); }
.footer-copy { font-family: var(--mono); font-size: .62rem; color: var(--border2); }

/* ── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  header {
    padding: 0 16px;
    grid-template-columns: 1fr auto; /* 모바일: 로고 + 언어버튼만 */
  }
  nav { display: none; }
  .lang-switcher { justify-content: flex-end; }
  .lang-dropdown {
    right: 0; left: auto;
    min-width: 140px;
  }
}
@media (max-width: 480px) {
  .hero { padding: 24px 16px 20px; }
  .hero h1 { font-size: 1.3rem; }
  .hero-sub { font-size: .65rem; }
  .container { padding: 20px 16px 48px; }
}

/* ── TOOL PAGE HERO ─────────────────────────────────────────── */
.hero {
  max-width: 900px; margin: 0 auto;
  padding: 36px 24px 28px;
  border-bottom: 1px solid var(--border);
}
.breadcrumb {
  font-family: var(--mono); font-size: .65rem;
  color: var(--muted); margin-bottom: 10px; letter-spacing: .3px;
}
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--cyan); }
.hero h1 {
  font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 700;
  color: var(--text); margin-bottom: 8px; line-height: 1.3;
}
.hero h1 span { color: var(--cyan); }
.hero-sub {
  font-family: var(--mono); font-size: .7rem;
  color: var(--muted); line-height: 1.7; letter-spacing: .2px;
}

/* ── TOOL PAGE CONTAINER ────────────────────────────────────── */
.container {
  max-width: 900px; margin: 0 auto;
  padding: 28px 24px 64px;
}

/* ── SEO DESCRIPTION SECTION (tool pages) ────────────────────── */
.seo-section {
  max-width: 900px;
  margin: 0 auto;
  padding: 56px 24px 72px;
}
.seo-section h2 {
  font-size: 1.4rem; font-weight: 700;
  margin-bottom: 12px; color: var(--text);
}
.seo-section h3 {
  font-size: 1rem; font-weight: 700;
  margin: 28px 0 8px; color: var(--text);
}
.seo-section p {
  font-size: .9rem; color: var(--muted);
  line-height: 1.8; margin-bottom: 12px;
}
.seo-section ul, .seo-section ol {
  padding-left: 20px; margin-bottom: 12px;
}
.seo-section li {
  font-size: .9rem; color: var(--muted);
  line-height: 1.8; margin-bottom: 4px;
}
.seo-eyebrow {
  font-family: var(--mono); font-size: .58rem;
  letter-spacing: 3px; text-transform: uppercase;
  color: var(--cyan); margin-bottom: 10px;
}
.seo-divider {
  height: 1px; background: var(--border);
  margin: 0 0 48px;
}
.seo-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 20px; margin: 20px 0;
}
.seo-card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 18px 20px;
}
.seo-card h4 {
  font-family: var(--mono); font-size: .72rem;
  font-weight: 700; color: var(--cyan);
  margin-bottom: 6px; letter-spacing: .5px;
}
.seo-card p { margin: 0; font-size: .82rem; }
.seo-faq-item { border-bottom: 1px solid var(--border); padding: 16px 0; }
.seo-faq-item:last-child { border: none; }
.seo-faq-item h4 { font-size: .9rem; font-weight: 700; margin-bottom: 6px; color: var(--text); }
.seo-faq-item p { margin: 0; font-size: .85rem; }
@media(max-width: 600px) { .seo-grid { grid-template-columns: 1fr; } }

/* ── BLOG POST ───────────────────────────────────────────────── */
.blog-hero {
  border-bottom: 1px solid var(--border);
  padding: 48px 24px 40px;
  text-align: center;
}
.blog-cat-tag {
  display: inline-block;
  font-family: var(--mono); font-size: .6rem;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--cyan); border: 1px solid rgba(0,212,255,.3);
  border-radius: 20px; padding: 4px 12px; margin-bottom: 16px;
}
.blog-hero h1 {
  font-size: 2rem; font-weight: 700; max-width: 700px;
  margin: 0 auto 14px; line-height: 1.3;
}
.blog-hero .blog-meta {
  font-family: var(--mono); font-size: .65rem;
  color: var(--muted); letter-spacing: .5px;
}
.blog-layout {
  max-width: 1100px; margin: 0 auto;
  padding: 48px 24px;
  display: grid; grid-template-columns: 1fr 280px;
  gap: 48px; align-items: start;
}
.blog-content h2 {
  font-size: 1.25rem; font-weight: 700;
  margin: 36px 0 12px; color: var(--text);
  padding-top: 8px; border-top: 1px solid var(--border);
}
.blog-content h3 {
  font-size: 1rem; font-weight: 700;
  margin: 24px 0 8px; color: var(--text);
}
.blog-content p {
  font-size: .92rem; color: var(--muted);
  line-height: 1.85; margin-bottom: 16px;
}
.blog-content ul, .blog-content ol {
  padding-left: 22px; margin-bottom: 16px;
}
.blog-content li {
  font-size: .92rem; color: var(--muted);
  line-height: 1.8; margin-bottom: 6px;
}
.blog-content strong { color: var(--text); }
.blog-table {
  width: 100%; border-collapse: collapse;
  margin: 20px 0; font-size: .85rem;
}
.blog-table th {
  background: var(--panel); font-family: var(--mono);
  font-size: .65rem; letter-spacing: 1px; text-transform: uppercase;
  color: var(--muted); padding: 10px 14px; text-align: left;
  border-bottom: 2px solid var(--border);
}
.blog-table td {
  padding: 10px 14px; border-bottom: 1px solid var(--border);
  color: var(--muted); font-size: .88rem;
}
.blog-table tr:last-child td { border: none; }
.blog-highlight {
  background: rgba(0,212,255,.06); border-left: 3px solid var(--cyan);
  border-radius: 0 8px 8px 0; padding: 14px 18px;
  margin: 20px 0;
}
.blog-highlight p { margin: 0; font-size: .88rem; color: var(--text); }
.blog-sidebar { position: sticky; top: 72px; display: flex; flex-direction: column; gap: 16px; }
.sidebar-card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 18px 20px;
}
.sidebar-card-title {
  font-family: var(--mono); font-size: .6rem;
  letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--muted); margin-bottom: 12px;
  display: flex; align-items: center; gap: 8px;
}
.sidebar-card-title::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.sidebar-link {
  display: block; padding: 8px 0;
  border-bottom: 1px solid var(--border);
  color: var(--muted); text-decoration: none;
  font-size: .82rem; line-height: 1.4;
  transition: color .2s;
}
.sidebar-link:last-child { border: none; }
.sidebar-link:hover { color: var(--cyan); }
.sidebar-tool-btn {
  display: block; padding: 12px 16px;
  background: linear-gradient(135deg,rgba(0,212,255,.12),rgba(10,165,233,.06));
  border: 1.5px solid var(--cyan); border-radius: 10px;
  color: var(--cyan); text-decoration: none;
  font-family: var(--mono); font-size: .75rem;
  font-weight: 700; letter-spacing: 1px;
  text-align: center; transition: all .2s;
}
.sidebar-tool-btn:hover { background: rgba(0,212,255,.18); }
@media(max-width: 800px) {
  .blog-layout { grid-template-columns: 1fr; }
  .blog-sidebar { position: static; }
  .blog-hero h1 { font-size: 1.5rem; }
}