/* ===== APP SHELL ===== */
#app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ===== SIDEBAR ===== */
.sidebar {
  width: 220px;
  flex-shrink: 0;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 0;
}

.sidebar-logo {
  padding: 0 1.5rem 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}

.logo-link {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0 0.75rem;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  width: 100%;
  transition: all 0.15s;
}

.nav-item:hover { background: var(--bg-card-hover); color: var(--text); }

.nav-item.active {
  background: var(--accent-dim);
  color: var(--accent);
}

.nav-icon { font-size: 0.8rem; }

.sidebar-footer {
  padding: 0.75rem;
  border-top: 1px solid var(--border);
}

.sidebar-home {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.5rem;
  display: block;
  border-radius: var(--radius-sm);
  transition: all 0.15s;
}

.sidebar-home:hover { color: var(--text); background: var(--bg-card-hover); }

/* ===== MAIN CONTENT ===== */
.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 2.5rem;
  background: var(--bg);
}

.section { display: none; }
.section.active { display: block; }

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.section-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: #000;
}

.btn-primary:hover { background: #00dfc4; }

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.btn-ghost:hover { border-color: rgba(255,255,255,0.15); color: var(--text); }

.btn-danger {
  background: rgba(239,68,68,0.15);
  color: #ef4444;
  border: 1px solid rgba(239,68,68,0.3);
}

.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.75rem; }

.btn-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1rem;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 4px;
  transition: all 0.15s;
}

.btn-close:hover { color: var(--text); background: var(--bg-card-hover); }

/* ===== CARD LIST ===== */
.card-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: all 0.15s;
}

.card:hover { background: var(--bg-card-hover); border-color: rgba(255,255,255,0.1); }

.card-main { display: flex; flex-direction: column; gap: 0.3rem; flex: 1; min-width: 0; }

.card-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.card-actions { display: flex; gap: 0.5rem; }

.tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  background: var(--accent-dim);
  color: var(--accent);
}

.tag-purple {
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
}

.tag-amber {
  background: rgba(245,158,11,0.12);
  color: #f59e0b;
}

/* ===== KANBAN ===== */
.kanban-board {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1rem;
  align-items: start;
  overflow-x: auto;
  padding-bottom: 1rem;
}

.kanban-column {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-width: 180px;
  overflow: hidden;
}

.kanban-column-header {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.kanban-column-title {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.kanban-column-count {
  font-size: 0.7rem;
  color: var(--text-dim);
  background: var(--bg-card-hover);
  padding: 0.1rem 0.45rem;
  border-radius: 100px;
}

.kanban-column-body {
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 100px;
}

.kanban-card {
  background: var(--bg-card-hover);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  cursor: grab;
  transition: all 0.15s;
}

.kanban-card:hover { border-color: var(--border-accent); }

.kanban-card-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
  line-height: 1.3;
}

.kanban-card-meta {
  font-size: 0.72rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.kanban-card-value {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  margin-top: 0.4rem;
}

/* ===== NOTES ===== */
.notes-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1rem;
}

.note-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  cursor: pointer;
  transition: all 0.15s;
  position: relative;
}

.note-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  border-radius: 3px 0 0 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-purple));
}

.note-card:hover { background: var(--bg-card-hover); border-color: rgba(255,255,255,0.1); }

.note-card-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.note-card-preview {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.note-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.note-card-time {
  font-size: 0.72rem;
  color: var(--text-dim);
}

.note-links {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.note-link-tag {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--accent-purple);
  background: var(--accent-purple-dim);
  padding: 0.15rem 0.5rem;
  border-radius: 100px;
  border: 1px solid rgba(167,139,250,0.2);
}

/* ===== DETAIL PANEL ===== */
.detail-panel {
  width: 400px;
  flex-shrink: 0;
  background: var(--bg-card);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform 0.25s ease;
}

.detail-panel.hidden { transform: translateX(100%); }

.detail-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.detail-panel-header h2 {
  font-size: 1.1rem;
  font-weight: 700;
}

.detail-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
}

.detail-field {
  margin-bottom: 1.25rem;
}

.detail-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  font-family: var(--font-body);
}

.detail-value {
  font-size: 0.95rem;
  color: var(--text);
}

.detail-section {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.detail-section-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.linked-note {
  background: var(--bg-card-hover);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  cursor: pointer;
  transition: all 0.15s;
}

.linked-note:hover { border-color: var(--border-accent); }

.linked-note-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.linked-note-preview {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal-overlay.hidden { display: none; }

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 480px;
  max-width: 90vw;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  font-size: 1.1rem;
  font-weight: 700;
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  font-family: var(--font-body);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  background: var(--bg-card-hover);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 0.6rem 0.85rem;
  outline: none;
  transition: border-color 0.15s;
  box-sizing: border-box;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--accent);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-select {
  appearance: none;
  cursor: pointer;
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  margin-top: 1.5rem;
}

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.empty-state p { font-size: 0.85rem; }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .sidebar { width: 180px; }
  .kanban-board { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 700px) {
  #app { flex-direction: column; }
  .sidebar { width: 100%; flex-direction: row; align-items: center; padding: 0.75rem 1rem; border-right: none; border-bottom: 1px solid var(--border); overflow-x: auto; }
  .sidebar-logo { padding: 0; border: none; margin: 0; }
  .sidebar-nav { flex-direction: row; padding: 0; flex: none; }
  .sidebar-footer { display: none; }
  .main-content { padding: 1.5rem; }
  .kanban-board { grid-template-columns: repeat(2, 1fr); }
}