/* ========================
   Notes Pages — Redesigned
   참고: Vercel Docs, Linear, GitBook 스타일
   ======================== */

/* ========================
   1. 허브 레이아웃
   ======================== */
.notes-hub {
  max-width: 1100px;
  margin: 0 auto;
  padding: calc(var(--nav-height) + 4rem) 2rem 5rem;
}

.notes-hub-header {
  margin-bottom: 3rem;
}

.notes-hub-header h1 {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
  letter-spacing: -0.02em;
}

.notes-hub-header h1 span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.notes-hub-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.6;
}

/* ========================
   2. 뷰 탭
   ======================== */
.notes-view-tabs {
  display: inline-flex;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px;
  gap: 4px;
  margin-bottom: 2.5rem;
}

.view-tab {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-family: inherit;
  font-weight: 500;
  padding: 0.45rem 1rem;
  cursor: pointer;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}

.view-tab:hover {
  color: var(--text-primary);
}

.view-tab.active {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
}

/* ========================
   3. Gallery View
   ======================== */
.notes-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.notes-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  text-decoration: none;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
  position: relative;
  overflow: hidden;
}

.notes-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity 0.2s;
}

.notes-card:hover {
  border-color: rgba(0, 212, 255, 0.4);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(0, 212, 255, 0.1);
  transform: translateY(-3px);
  color: var(--text-primary);
}

.notes-card:hover::before {
  opacity: 1;
}

.notes-card-icon {
  font-size: 2.2rem;
  line-height: 1;
}

.notes-card-body {
  flex: 1;
}

.notes-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
  letter-spacing: -0.01em;
}

.notes-card-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.notes-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.25rem;
}

.notes-card-arrow {
  font-size: 1rem;
  color: var(--text-muted);
  transition: color 0.2s, transform 0.2s;
}

.notes-card:hover .notes-card-arrow {
  color: var(--accent-cyan);
  transform: translateX(3px);
}

/* ========================
   4. Table View
   ======================== */
.notes-table-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.notes-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.notes-table thead {
  background: var(--bg-secondary);
}

.notes-table th {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.85rem 1.25rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.notes-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: middle;
}

.notes-table td strong {
  font-weight: 600;
  color: var(--text-primary);
}

.notes-table tr:last-child td {
  border-bottom: none;
}

.notes-table tbody tr {
  cursor: pointer;
  transition: background 0.15s;
}

.notes-table tbody tr:hover {
  background: var(--bg-card-hover);
}

/* ========================
   5. 상태 배지
   ======================== */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
  border-radius: 20px;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.status-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-badge.done {
  background: rgba(34, 197, 94, 0.15);
  color: #4ade80;
  border: 1px solid rgba(34, 197, 94, 0.2);
}
.status-badge.done::before { background: #4ade80; }

.status-badge.in-progress {
  background: rgba(0, 212, 255, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 212, 255, 0.2);
}
.status-badge.in-progress::before { background: var(--accent-cyan); }

.status-badge.not-started {
  background: rgba(100, 100, 100, 0.12);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.status-badge.not-started::before { background: var(--text-muted); }

/* ========================
   6. 개별 페이지 — 레이아웃
   ======================== */
.notes-page {
  padding-top: var(--nav-height);
  min-height: 100vh;
}

.notes-page-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  gap: 3rem;
  align-items: flex-start;
}

/* ========================
   7. 사이드바
   ======================== */
.notes-sidebar {
  width: 240px;
  flex-shrink: 0;
  padding-top: 2.5rem;
}

.notes-sidebar-nav {
  position: sticky;
  top: calc(var(--nav-height) + 1.5rem);
  max-height: calc(100vh - var(--nav-height) - 3rem);
  overflow-y: auto;
  padding-bottom: 2rem;
}

.notes-sidebar-nav::-webkit-scrollbar {
  width: 3px;
}

.sidebar-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
  text-decoration: none;
  transition: color 0.2s;
  padding: 0.3rem 0;
}

.sidebar-back:hover { color: var(--accent-cyan); }

.sidebar-section-title {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  padding: 0 0.5rem;
}

.sidebar-chapter {
  display: flex;
  align-items: center;
  padding: 0.4rem 0.75rem;
  font-size: 0.83rem;
  color: var(--text-secondary);
  border-left: 2px solid transparent;
  text-decoration: none;
  transition: all 0.15s;
  border-radius: 0 6px 6px 0;
  line-height: 1.4;
  margin-bottom: 1px;
}

.sidebar-chapter:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.04);
}

.sidebar-chapter.active {
  color: var(--accent-cyan);
  border-left-color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.07);
  font-weight: 500;
}

/* ========================
   8. 본문 콘텐츠
   ======================== */
.notes-content {
  flex: 1;
  min-width: 0;
  max-width: 780px;
  padding: 2.5rem 0 5rem;
}

.notes-content-header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.notes-content-header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.notes-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.notes-breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
}

.notes-breadcrumb a:hover { color: var(--accent-cyan); }

.notes-breadcrumb .sep {
  color: var(--text-muted);
}

/* ========================
   9. 본문 타이포그래피
   ======================== */
.notes-body {
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.notes-body section {
  margin-bottom: 0.5rem;
}

.notes-body h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 3rem 0 1.25rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.01em;
  scroll-margin-top: calc(var(--nav-height) + 1rem);
}

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

.notes-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 2rem 0 0.75rem;
  scroll-margin-top: calc(var(--nav-height) + 1rem);
}

.notes-body h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 1.25rem 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.notes-body p {
  margin-bottom: 1.1rem;
  color: var(--text-primary);
}

.notes-body em {
  color: var(--text-secondary);
  font-style: normal;
  font-size: 0.85rem;
}

.notes-body ul,
.notes-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.1rem;
  color: var(--text-primary);
}

.notes-body li {
  margin-bottom: 0.4rem;
  line-height: 1.7;
}

.notes-body .diagram {
  margin: 2rem 0;
  padding: 1.5rem;
  background: #111;
  border: 1px solid #2a2a2a;
  border-radius: var(--radius-md);
  text-align: center;
}

.notes-body .diagram svg {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

.notes-body .diagram figcaption {
  margin-top: 1rem;
  color: var(--text-tertiary, #888);
  font-size: 0.85rem;
  font-style: italic;
}

.notes-body .callout {
  border-left: 3px solid var(--accent-cyan);
  padding: 0.9rem 1.2rem;
  margin: 1.5rem 0;
  background: rgba(0, 212, 255, 0.07);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-size: 0.93rem;
}

.notes-body .callout strong {
  color: var(--accent-cyan);
}

.notes-body blockquote {
  border-left: 3px solid var(--accent-purple);
  padding: 0.9rem 1.2rem;
  margin: 1.5rem 0;
  background: rgba(123, 47, 247, 0.07);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-size: 0.93rem;
}

.notes-body blockquote strong {
  color: var(--text-primary);
}

.notes-body code {
  background: var(--bg-secondary);
  color: #e2b714;
  font-family: var(--font-mono);
  font-size: 0.83em;
  border-radius: 4px;
  padding: 0.15em 0.5em;
  border: 1px solid var(--border);
}

.notes-body pre {
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.4rem 1.5rem;
  overflow-x: auto;
  margin: 1.25rem 0;
  position: relative;
}

.notes-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: 0.86rem;
  line-height: 1.6;
}

.notes-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.notes-body th {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.8rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.notes-body td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: top;
  line-height: 1.6;
}

.notes-body tr:last-child td { border-bottom: none; }

.notes-body tbody tr:hover td {
  background: rgba(255,255,255,0.02);
}

.notes-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* ========================
   10. 모바일
   ======================== */
@media (max-width: 900px) {
  .notes-page-inner {
    flex-direction: column;
    gap: 0;
  }

  .notes-sidebar {
    width: 100%;
    padding-top: 1.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
    margin-bottom: 0;
  }

  .notes-sidebar-nav {
    position: static;
    max-height: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
  }

  .sidebar-back { width: 100%; margin-bottom: 0.75rem; }
  .sidebar-section-title { width: 100%; }

  .sidebar-chapter {
    border-left: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.3rem 0.7rem;
    font-size: 0.78rem;
  }

  .sidebar-chapter.active {
    border-color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.1);
  }

  .notes-content { padding-top: 1.5rem; }
}

@media (max-width: 600px) {
  .notes-hub {
    padding: calc(var(--nav-height) + 2.5rem) 1.25rem 4rem;
  }

  .notes-hub-header h1 { font-size: 1.8rem; }

  .notes-gallery {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .notes-page-inner { padding: 0 1.25rem; }

  .notes-content-header h1 { font-size: 1.6rem; }

  .notes-body h2 { font-size: 1.15rem; }

  .notes-table th,
  .notes-table td { padding: 0.65rem 0.85rem; }
}