/* ============================================================
   TaskFlow — styles
   ============================================================ */

/* --- Reset & base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --sidebar-w: 230px;
  --sidebar-bg: #1a1d27;
  --sidebar-text: #9ba3b8;
  --sidebar-active-bg: #2e3347;
  --sidebar-active-text: #ffffff;
  --sidebar-hover-bg: #232636;
  --sidebar-logo-color: #7c6af7;
  --accent: #7c6af7;
  --accent-hover: #6a58e0;
  --accent-light: #ece9ff;
  --bg: #f4f5f9;
  --surface: #ffffff;
  --border: #e3e5ed;
  --text: #1e2131;
  --text-muted: #7a7f96;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 2px 12px rgba(0,0,0,0.07);
  --priority-high: #ef4444;
  --priority-high-bg: #fef2f2;
  --priority-normal: #7c6af7;
  --priority-normal-bg: #ece9ff;
  --priority-low: #22c55e;
  --priority-low-bg: #f0fdf4;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --orange: #f59e0b;
  --orange-light: #fffbeb;
  --orange-border: #fcd34d;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
}

/* --- Shell layout --- */
.shell {
  display: flex;
  width: 100%;
  min-height: 100vh;
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar {
  width: var(--sidebar-w);
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  flex-shrink: 0;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 1.35rem 1.25rem 1.1rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  letter-spacing: -0.01em;
}

.sidebar-logo i {
  color: var(--sidebar-logo-color);
  font-size: 1.25rem;
}

.sidebar-nav {
  list-style: none;
  padding: 0.75rem 0;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.62rem 1.25rem;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 0;
  transition: background 0.15s, color 0.15s;
  cursor: pointer;
}

.nav-item i {
  width: 18px;
  text-align: center;
  font-size: 0.95rem;
  opacity: 0.8;
}

.nav-item:hover {
  background: var(--sidebar-hover-bg);
  color: #fff;
}

.nav-item.active {
  background: var(--sidebar-active-bg);
  color: var(--sidebar-active-text);
  font-weight: 600;
}

.nav-item.active i { opacity: 1; color: var(--accent); }

.nav-divider {
  height: 1px;
  background: rgba(255,255,255,0.06);
  margin: 0.5rem 1rem;
}

.sidebar-footer {
  padding: 1rem 1.25rem;
  font-size: 0.78rem;
  opacity: 0.4;
  border-top: 1px solid rgba(255,255,255,0.06);
}

/* ============================================================
   MAIN CONTENT
   ============================================================ */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-height: 100vh;
  padding: 2.5rem 2.75rem;
  max-width: 900px;
}

.page { display: block; }
.page.hidden { display: none; }

/* Page header */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 2rem;
  gap: 1rem;
}

.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text);
}

.page-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  background: var(--surface);
  color: var(--text);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  white-space: nowrap;
  text-decoration: none;
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }

/* ============================================================
   INLINE DOCS (integrated documentation panels)
   ============================================================ */
.inline-docs {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
  overflow: hidden;
  transition: all 0.2s;
}

.inline-docs-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.1rem;
  cursor: pointer;
  user-select: none;
  background: var(--accent-light);
  border-bottom: 1.5px solid transparent;
  transition: background 0.15s;
}
.inline-docs-header:hover {
  background: #e0dbff;
}

.inline-docs-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--accent-hover);
}
.inline-docs-title i {
  font-size: 0.95rem;
}

.inline-docs-toggle {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.8rem;
  padding: 0.25rem;
  transition: transform 0.25s;
}

.inline-docs.collapsed .inline-docs-toggle {
  transform: rotate(-90deg);
}
.inline-docs.collapsed .inline-docs-body {
  display: none;
}
.inline-docs.collapsed .inline-docs-header {
  border-bottom-color: transparent;
}
.inline-docs:not(.collapsed) .inline-docs-header {
  border-bottom-color: var(--border);
}

.inline-docs-body {
  padding: 1.1rem 1.25rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: #3a3e52;
}

/* Orange accent variant for Work page */
.inline-docs-accent-orange .inline-docs-header {
  background: var(--orange-light);
}
.inline-docs-accent-orange .inline-docs-header:hover {
  background: #fef3c7;
}
.inline-docs-accent-orange .inline-docs-title {
  color: #92400e;
}
.inline-docs-accent-orange .inline-docs-toggle {
  color: var(--orange);
}

/* Inline docs rendered markdown */
.inline-docs-body h1 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.45rem;
  letter-spacing: -0.02em;
}
.inline-docs-body h2 {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}
.inline-docs-body h3 {
  font-size: 0.8rem;
  font-weight: 700;
  margin-top: 1rem;
  margin-bottom: 0.35rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.inline-docs-body p { margin-bottom: 0.75rem; }
.inline-docs-body ul, .inline-docs-body ol {
  padding-left: 1.35rem;
  margin-bottom: 0.75rem;
}
.inline-docs-body li { margin-bottom: 0.25rem; }
.inline-docs-body code {
  background: #f0eeff;
  color: var(--accent-hover);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.86em;
  font-family: 'Fira Code', 'Cascadia Code', monospace;
}
.inline-docs-body blockquote {
  border-left: 3px solid var(--accent);
  margin: 0.75rem 0;
  padding: 0.4rem 0.9rem;
  background: var(--accent-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: #4a4080;
  font-style: italic;
}
.inline-docs-body hr {
  border: none;
  border-top: 1.5px solid var(--border);
  margin: 1.25rem 0;
}
.inline-docs-body strong { color: var(--text); }

/* Docs feature grid inside inline docs */
.docs-feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.65rem;
  margin: 0.75rem 0 0.5rem;
}
.docs-feature-item {
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.85rem;
  text-align: center;
}
.docs-feature-item .feat-icon {
  font-size: 1.25rem;
  margin-bottom: 0.3rem;
}
.docs-feature-item h4 {
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 0.15rem;
}
.docs-feature-item p {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0;
}

/* ============================================================
   TODO PAGE
   ============================================================ */
.todo-add-bar {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 1.1rem;
}

.todo-add-bar input {
  flex: 1;
  padding: 0.65rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font);
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.15s;
}
.todo-add-bar input:focus { outline: none; border-color: var(--accent); }
.todo-add-bar input::placeholder { color: var(--text-muted); }

.todo-add-bar select {
  padding: 0.65rem 0.8rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-family: var(--font);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
.todo-add-bar select:focus { outline: none; border-color: var(--accent); }

.todo-add-bar button {
  padding: 0.65rem 1.2rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: background 0.15s;
}
.todo-add-bar button:hover { background: var(--accent-hover); }

/* Filters */
.todo-filters {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.filter-btn {
  padding: 0.35rem 0.9rem;
  border: 1.5px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  color: var(--text-muted);
  font-size: 0.83rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.filter-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Todo list */
.todo-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.todo-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.1rem;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: border-color 0.15s, opacity 0.2s;
  animation: slideIn 0.18s ease;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.todo-item.completed { opacity: 0.55; }
.todo-item.completed .todo-text { text-decoration: line-through; color: var(--text-muted); }

.todo-check {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-radius: 50%;
  flex-shrink: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  background: transparent;
}
.todo-check:hover { border-color: var(--accent); }
.todo-check.checked { background: var(--accent); border-color: var(--accent); }
.todo-check.checked::after {
  content: '';
  display: block;
  width: 5px; height: 9px;
  border: 2px solid #fff;
  border-top: none; border-left: none;
  transform: rotate(45deg) translateY(-1px);
}

.todo-text {
  flex: 1;
  font-size: 0.95rem;
  word-break: break-word;
}

.priority-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
.priority-badge.high   { color: var(--priority-high);   background: var(--priority-high-bg); }
.priority-badge.normal { color: var(--priority-normal); background: var(--priority-normal-bg); }
.priority-badge.low    { color: var(--priority-low);    background: var(--priority-low-bg); }

.todo-delete {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  transition: color 0.15s, background 0.15s;
  opacity: 0;
}
.todo-item:hover .todo-delete { opacity: 1; }
.todo-delete:hover { color: #ef4444; background: #fef2f2; }

.todo-empty {
  text-align: center;
  padding: 3.5rem 1rem;
  color: var(--text-muted);
}
.todo-empty i { font-size: 2.5rem; margin-bottom: 0.75rem; opacity: 0.35; display: block; }
.todo-empty p { font-size: 0.95rem; }

.todo-bulk-actions {
  margin-top: 1.25rem;
  display: flex;
  justify-content: flex-end;
}

.todo-bulk-actions button {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.83rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background 0.15s;
}
.todo-bulk-actions button:hover { color: #ef4444; background: #fef2f2; }

/* ============================================================
   EDITOR PAGE
   ============================================================ */
.editor-actions {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

.editor-tabs {
  display: flex;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.editor-tab {
  padding: 0.45rem 1rem;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.83rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.editor-tab:hover { border-color: var(--accent); color: var(--accent); }
.editor-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.editor-panel {
  margin-bottom: 1.25rem;
}
.editor-panel.hidden { display: none; }

.preview-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.preview-card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.preview-card-label {
  padding: 0.65rem 1rem;
  background: var(--accent-light);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-hover);
  border-bottom: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.preview-card-orange .preview-card-label {
  background: var(--orange-light);
  color: #92400e;
}
.preview-card-content {
  padding: 1rem 1.15rem;
  font-size: 0.85rem;
  line-height: 1.65;
  max-height: 300px;
  overflow-y: auto;
  color: #3a3e52;
}
.preview-card-content h1 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.35rem; border-bottom: 1.5px solid var(--border); padding-bottom: 0.35rem; }
.preview-card-content h2 { font-size: 0.92rem; font-weight: 700; margin-top: 1rem; margin-bottom: 0.4rem; }
.preview-card-content h3 { font-size: 0.75rem; font-weight: 700; margin-top: 0.8rem; margin-bottom: 0.3rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }
.preview-card-content p { margin-bottom: 0.6rem; }
.preview-card-content ul { padding-left: 1.2rem; margin-bottom: 0.6rem; }
.preview-card-content li { margin-bottom: 0.2rem; }
.preview-card-content code { background: #f0eeff; color: var(--accent-hover); padding: 0.1rem 0.35rem; border-radius: 3px; font-size: 0.85em; }
.preview-card-content blockquote { border-left: 3px solid var(--accent); padding: 0.35rem 0.75rem; background: var(--accent-light); margin: 0.5rem 0; border-radius: 0 4px 4px 0; font-style: italic; color: #4a4080; }
.preview-card-content hr { border: none; border-top: 1.5px solid var(--border); margin: 1rem 0; }
.preview-card-content strong { color: var(--text); }

.info-banner {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  background: var(--accent-light);
  border: 1.5px solid #d4ccff;
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  font-size: 0.9rem;
  color: #3b2fa0;
}
.info-banner i {
  font-size: 1.3rem;
  margin-top: 0.1rem;
  flex-shrink: 0;
  color: var(--accent);
}
.info-banner strong {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
}
.info-banner p {
  margin: 0;
  color: #5a4fb0;
  line-height: 1.6;
}

.editor-wrap {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.editor-toolbar {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.55rem 0.75rem;
  background: #f9f9fc;
  border-bottom: 1.5px solid var(--border);
  flex-wrap: wrap;
}

.tb-btn {
  padding: 0.3rem 0.6rem;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text);
  transition: all 0.12s;
  min-width: 32px;
  text-align: center;
}
.tb-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }

.tb-sep {
  width: 1px; height: 20px;
  background: var(--border);
  margin: 0 0.25rem;
}

.editor-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

#docs-editor {
  width: 100%;
  min-height: 420px;
  padding: 1.5rem 1.75rem;
  border: none;
  resize: vertical;
  font-family: 'Fira Code', 'Cascadia Code', 'Courier New', monospace;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--text);
  background: var(--surface);
  outline: none;
}
#docs-editor::placeholder { color: var(--text-muted); }

.editor-status {
  padding: 0.45rem 1rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: #f9f9fc;
  border-top: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.editor-status.saved   { color: #16a34a; }
.editor-status.unsaved { color: #d97706; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  :root { --sidebar-w: 60px; }

  .sidebar-logo span,
  .nav-item span,
  .sidebar-footer { display: none; }

  .sidebar-logo { justify-content: center; padding: 1rem; }
  .nav-item { justify-content: center; padding: 0.75rem; }
  .nav-item i { width: auto; font-size: 1.1rem; }
  .nav-divider { margin: 0.4rem 0.5rem; }

  .main-content { padding: 1.5rem 1.25rem; }
  .todo-add-bar { flex-wrap: wrap; }
  .todo-add-bar input { min-width: 0; }

  .preview-split {
    grid-template-columns: 1fr;
  }
}