/* ===== 라이트 테마 · 한투 + n8n 컬러 시스템 ===== */
:root {
  --bg: #ffffff;
  --bg-soft: #f7f9fc;
  --bg-card: #ffffff;
  --border: #e3e8ef;
  --border-strong: #c8d1dd;
  --text: #1a2332;
  --text-soft: #5a6a7a;
  --text-muted: #8a98a8;

  --kis-blue: #0067ac;
  --kis-blue-soft: #e8f1f9;
  --kis-blue-dark: #004f86;
  --n8n-coral: #ea4b71;
  --n8n-coral-soft: #fde7ed;

  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;

  --code-bg: #f3f5f8;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06), 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.08), 0 4px 8px rgba(15, 23, 42, 0.04);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --max-content: 760px;
  --sidebar-w: 280px;
  --header-h: 64px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo',
    'Noto Sans KR', 'Malgun Gothic', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--kis-blue);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover { color: var(--kis-blue-dark); text-decoration: underline; }

/* ===== 헤더 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
  display: flex;
  align-items: center;
}
.header-inner {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
}
.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--kis-blue) 0%, var(--n8n-coral) 100%);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 14px;
  letter-spacing: -0.02em;
}
.brand-text small { display: block; color: var(--text-soft); font-weight: 500; font-size: 12px; }
.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}
.header-nav a {
  padding: 8px 14px;
  font-size: 14px;
  color: var(--text-soft);
  border-radius: var(--radius-sm);
  font-weight: 500;
}
.header-nav a:hover { background: var(--bg-soft); color: var(--text); text-decoration: none; }
.gh-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--text);
  color: #fff !important;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
}
.gh-link:hover { background: #000; text-decoration: none !important; }

/* ===== 레이아웃 ===== */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  max-width: 1280px;
  margin: 0 auto;
  min-height: calc(100vh - var(--header-h));
}
.sidebar {
  border-right: 1px solid var(--border);
  padding: 32px 20px;
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
}
.sidebar h4 {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 12px 4px;
  font-weight: 700;
}
.sidebar-nav { list-style: none; padding: 0; margin: 0 0 24px; }
.sidebar-nav li { margin: 2px 0; }
.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 500;
}
.sidebar-nav a:hover { background: var(--bg-soft); color: var(--text); text-decoration: none; }
.sidebar-nav a.active {
  background: var(--kis-blue-soft);
  color: var(--kis-blue-dark);
  font-weight: 600;
}
.sidebar-nav .num {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--bg-soft);
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-soft);
  flex-shrink: 0;
}
.sidebar-nav a.active .num { background: var(--kis-blue); color: #fff; }
.sidebar-nav a.done .num { background: var(--success); color: #fff; }
.sidebar-nav .done-mark {
  margin-left: auto;
  color: var(--success);
  font-size: 14px;
  display: none;
}
.sidebar-nav a.done .done-mark { display: inline; }

.content {
  padding: 48px 56px;
  max-width: calc(var(--max-content) + 112px);
  width: 100%;
}
.content-inner { max-width: var(--max-content); }

/* ===== 진도바 ===== */
.progress-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 20px;
}
.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-soft);
  margin-bottom: 8px;
  font-weight: 600;
}
.progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--kis-blue) 0%, var(--n8n-coral) 100%);
  border-radius: 999px;
  transition: width 0.4s ease;
}

/* ===== 모듈 메타 헤더 ===== */
.module-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 16px 20px;
  background: var(--kis-blue-soft);
  border-radius: var(--radius-md);
  margin-bottom: 32px;
  font-size: 13px;
  color: var(--kis-blue-dark);
}
.module-meta strong { font-weight: 600; }
.module-meta .meta-item { display: flex; align-items: center; gap: 6px; }

.module-complete-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  color: var(--text-soft);
  font-weight: 600;
  transition: all 0.15s;
  margin-bottom: 24px;
}
.module-complete-toggle:hover { border-color: var(--border-strong); }
.module-complete-toggle.checked {
  background: #ecfdf5;
  border-color: var(--success);
  color: #047857;
}

/* ===== 본문 타이포 ===== */
.content h1 {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  line-height: 1.3;
}
.content h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 48px 0 16px;
  letter-spacing: -0.01em;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.content h3 {
  font-size: 19px;
  font-weight: 700;
  margin: 32px 0 12px;
}
.content h4 {
  font-size: 16px;
  font-weight: 700;
  margin: 24px 0 8px;
}
.content p { margin: 0 0 16px; }
.content ul, .content ol { padding-left: 24px; margin: 0 0 16px; }
.content li { margin: 4px 0; }
.content strong { color: var(--text); font-weight: 700; }
.content em { font-style: normal; background: linear-gradient(180deg, transparent 60%, #fef3c7 60%); padding: 0 2px; }

.content blockquote {
  margin: 20px 0;
  padding: 16px 20px;
  border-left: 4px solid var(--kis-blue);
  background: var(--kis-blue-soft);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text);
}
.content blockquote p:last-child { margin-bottom: 0; }
.content blockquote strong:first-child { color: var(--kis-blue-dark); }

/* 콜아웃: ⚠️ 경고 / 💡 팁 / ✅ 체크 */
.content blockquote:has(strong:first-child:where(:contains("⚠️"))) {
  border-color: var(--warning);
  background: #fffbeb;
}

/* ===== 코드 블록 ===== */
.content code {
  font-family: 'JetBrains Mono', 'D2Coding', Consolas, Monaco, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--n8n-coral);
}
.content pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 20px 0;
  position: relative;
  font-size: 13px;
  line-height: 1.6;
}
.content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: 13px;
}
.code-copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(255, 255, 255, 0.1);
  color: #cbd5e1;
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 5px 10px;
  border-radius: 5px;
  font-size: 11px;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.15s;
}
.code-copy-btn:hover { background: rgba(255, 255, 255, 0.2); color: #fff; }
.code-copy-btn.copied { background: var(--success); color: #fff; border-color: var(--success); }

/* ===== 테이블 ===== */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.content th, .content td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.content th {
  background: var(--bg-soft);
  font-weight: 700;
  color: var(--text);
  font-size: 13px;
}
.content tr:last-child td { border-bottom: none; }

/* ===== 이미지/SVG ===== */
.content img,
.content svg,
.infographic {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 20px auto;
  border-radius: var(--radius-md);
}

.infographic-wrap {
  margin: 32px 0;
  padding: 24px;
  background: var(--bg-soft);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}
.infographic-caption {
  font-size: 13px;
  color: var(--text-soft);
  text-align: center;
  margin-top: 12px;
  font-weight: 500;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}

/* ===== 모듈 푸터 네비 ===== */
.module-footer-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.module-footer-nav a {
  padding: 16px 20px;
  background: var(--bg-soft);
  border-radius: var(--radius-md);
  color: var(--text);
  border: 1px solid var(--border);
  transition: all 0.15s;
}
.module-footer-nav a:hover {
  border-color: var(--kis-blue);
  background: var(--kis-blue-soft);
  text-decoration: none;
  transform: translateY(-2px);
}
.module-footer-nav small { color: var(--text-muted); font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; }
.module-footer-nav strong { display: block; margin-top: 4px; font-size: 14px; }
.module-footer-nav .next { text-align: right; }

/* ===== 랜딩 페이지 ===== */
.hero {
  padding: 64px 0 48px;
  text-align: center;
}
.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  background: var(--kis-blue-soft);
  color: var(--kis-blue-dark);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
}
.hero h1 {
  font-size: 44px;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin: 0 0 16px;
  font-weight: 800;
}
.hero h1 .accent {
  background: linear-gradient(90deg, var(--kis-blue) 0%, var(--n8n-coral) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p { font-size: 18px; color: var(--text-soft); max-width: 640px; margin: 0 auto 32px; }
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  transition: all 0.15s;
}
.btn-primary {
  background: var(--kis-blue);
  color: #fff !important;
}
.btn-primary:hover { background: var(--kis-blue-dark); text-decoration: none !important; transform: translateY(-1px); }
.btn-secondary {
  background: var(--bg-soft);
  color: var(--text) !important;
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: #fff; border-color: var(--border-strong); text-decoration: none !important; }

.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin: 32px 0;
}
.module-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none !important;
  color: var(--text);
  position: relative;
}
.module-card:hover {
  border-color: var(--kis-blue);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.module-card-num {
  display: inline-flex;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--kis-blue) 0%, var(--n8n-coral) 100%);
  color: #fff;
  font-weight: 800;
  font-size: 16px;
  align-items: center;
  justify-content: center;
}
.module-card h3 {
  margin: 8px 0 4px;
  font-size: 17px;
  font-weight: 700;
}
.module-card p {
  margin: 0;
  font-size: 14px;
  color: var(--text-soft);
  line-height: 1.5;
}
.module-card-meta {
  display: flex;
  gap: 12px;
  margin-top: 12px;
  font-size: 12px;
  color: var(--text-muted);
}
.module-card.done::after {
  content: '✓';
  position: absolute;
  top: 16px;
  right: 16px;
  width: 24px;
  height: 24px;
  background: var(--success);
  color: #fff;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 13px;
}

/* 거래량 계산기 (모듈 5) */
.volume-calc {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 32px 0;
}
.volume-calc h4 { margin-top: 0; }
.volume-calc-inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.volume-calc label { display: block; font-size: 12px; color: var(--text-soft); font-weight: 600; margin-bottom: 6px; }
.volume-calc input {
  width: 100%;
  padding: 10px 12px;
  font-size: 16px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: inherit;
}
.volume-calc input:focus { outline: 2px solid var(--kis-blue); border-color: var(--kis-blue); }
.volume-calc-result {
  margin-top: 16px;
  padding: 16px;
  background: #fff;
  border-radius: var(--radius-md);
  font-size: 14px;
  border-left: 4px solid var(--text-muted);
}
.volume-calc-result.alert { border-color: var(--n8n-coral); background: var(--n8n-coral-soft); }
.volume-calc-result.normal { border-color: var(--success); background: #ecfdf5; }
.volume-calc-ratio { font-size: 28px; font-weight: 800; color: var(--text); }

/* ===== 푸터 ===== */
.site-footer {
  margin-top: 64px;
  padding: 32px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}
.site-footer a { color: var(--text-soft); }

/* ===== 반응형 ===== */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .content { padding: 24px 20px; }
  .hero { padding: 32px 0; }
  .hero h1 { font-size: 32px; }
  .header-nav a { display: none; }
  .header-nav .gh-link { display: inline-flex; }
}