/* ==========================================================================
   মেঘা (Megha) নোটস অ্যাপ — আধুনিক ও অনন্য বাংলা সিএসএস স্টাইলশিট
   ========================================================================== */

@import url('https://cdn.msar.me/fonts/adorsho-lipi/font.css');

:root {
  /* থিম ভেরিয়েবলস (লাইট মোড) */
  --bg-primary: #f1f5f9;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f8fafc;
  --bg-glass: rgba(255, 255, 255, 0.82);
  --bg-glass-subtle: rgba(255, 255, 255, 0.6);
  --bg-hover: #e0f2fe;
  --bg-active: #bae6fd;

  --border-color: #e2e8f0;
  --border-subtle: rgba(226, 232, 240, 0.7);
  --border-focus: #0284c7;

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  /* মেঘা অনন্য ক্লাউড গ্রেডিয়েন্ট প্যালেট */
  --cloud-gradient: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 50%, #6366f1 100%);
  --cloud-gradient-hover: linear-gradient(135deg, #0284c7 0%, #2563eb 50%, #4f46e5 100%);
  --cloud-gradient-subtle: linear-gradient(135deg, rgba(14, 165, 233, 0.08) 0%, rgba(99, 102, 241, 0.08) 100%);
  --cloud-glow: 0 10px 25px -5px rgba(14, 165, 233, 0.35);

  --accent-color: #0284c7;
  --accent-light: #e0f2fe;
  --accent-hover: #0369a1;

  --danger-color: #ef4444;
  --danger-light: #fee2e2;
  --danger-hover: #dc2626;

  --success-color: #10b981;
  --success-light: #d1fae5;

  --shadow-sm: 0 2px 4px 0 rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 14px -2px rgba(15, 23, 42, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 14px 30px -4px rgba(15, 23, 42, 0.12), 0 4px 12px -2px rgba(15, 23, 42, 0.06);

  --font-main: 'AdorshoLipi', 'Adorsho Lipi', 'Hind Siliguri', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --sidebar-width: 330px;
  --header-height: 68px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
}

[data-theme="dark"] {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1e293b;
  --bg-glass: rgba(15, 23, 42, 0.85);
  --bg-glass-subtle: rgba(30, 41, 59, 0.6);
  --bg-hover: #1e293b;
  --bg-active: #334155;

  --border-color: #1e293b;
  --border-subtle: rgba(51, 65, 85, 0.6);
  --border-focus: #38bdf8;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #090d16;

  --cloud-gradient: linear-gradient(135deg, #0284c7 0%, #3b82f6 50%, #8b5cf6 100%);
  --cloud-gradient-hover: linear-gradient(135deg, #0369a1 0%, #2563eb 50%, #7c3aed 100%);
  --cloud-gradient-subtle: linear-gradient(135deg, rgba(56, 189, 248, 0.12) 0%, rgba(139, 92, 246, 0.12) 100%);
  --cloud-glow: 0 10px 25px -5px rgba(56, 189, 248, 0.25);

  --accent-color: #38bdf8;
  --accent-light: #082f49;
  --accent-hover: #7dd3fc;

  --danger-color: #f87171;
  --danger-light: #451a1a;
  --danger-hover: #ef4444;

  --success-color: #34d399;
  --success-light: #064e3b;

  --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 6px 16px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 36px -4px rgba(0, 0, 0, 0.65);
}

/* বেস রিসেট */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow: hidden;
  transition: background-color 0.25s ease, color 0.25s ease;
  letter-spacing: 0.1px;
}

/* ব্যাকগ্রাউন্ড ক্লাউড এফেক্ট (ফিট টু স্ক্রিন, ৩০% অপ্যাসিটি) */
.app-cloud-bg {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  /* লোকাল অ্যাসেট ও ব্যাকআপ ইউআরএল */
  background-image: url('../assets/clouds-bg.jpg'), url('https://png.pngtree.com/thumb_back/fh260/background/20230930/pngtree-a-blue-sky-above-clouds-with-clouds-image_13313410.jpg');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  opacity: 0.30;
  transform: translateZ(0);
}

body::before {
  content: "";
  position: fixed;
  top: -200px;
  right: -200px;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.12) 0%, rgba(99, 102, 241, 0.05) 50%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: "";
  position: fixed;
  bottom: -200px;
  left: -200px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, rgba(14, 165, 233, 0.03) 50%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

/* অ্যাপ লেআউট */
.app-layout {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   সাইডবার (Glassmorphism & Sleek Cards)
   ========================================================================== */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background-color: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 100%;
  z-index: 100;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
}

.sidebar-header {
  padding: 1.25rem 1.25rem 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.brand-icon {
  font-size: 2.2rem;
  line-height: 1;
  filter: drop-shadow(0 4px 10px rgba(14, 165, 233, 0.4));
  animation: floatCloud 4s ease-in-out infinite alternate;
}

@keyframes floatCloud {
  0% { transform: translateY(0px) scale(1); }
  100% { transform: translateY(-4px) scale(1.04); }
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.65rem;
  font-weight: 700;
  background: var(--cloud-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
  letter-spacing: -0.5px;
}

.brand-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.5px;
}

.mobile-close-btn {
  display: none;
}

.sidebar-actions {
  padding: 0.5rem 1.25rem 0.75rem;
}

/* বাটন স্টাইলস */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
  user-select: none;
}

.btn-block {
  width: 100%;
}

.btn-primary {
  background: var(--cloud-gradient);
  color: #ffffff;
  box-shadow: var(--cloud-glow);
  border: none;
}

.btn-primary:hover {
  background: var(--cloud-gradient-hover);
  box-shadow: 0 12px 28px -4px rgba(14, 165, 233, 0.45);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-hover);
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.btn-danger {
  background-color: var(--danger-light);
  color: var(--danger-color);
  border: 1px solid transparent;
}

.btn-danger:hover {
  background-color: var(--danger-color);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.25);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

/* সার্চ বক্স */
.search-box {
  position: relative;
  margin: 0 1.25rem 0.75rem;
}

.search-box input {
  width: 100%;
  padding: 0.65rem 0.85rem 0.65rem 2.4rem;
  font-family: var(--font-main);
  font-size: 0.92rem;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: all 0.2s ease;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.03);
}

.search-box input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.18);
  background-color: var(--bg-secondary);
}

.search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  font-size: 0.95rem;
}

/* ক্যাটাগরি ফিল্টার চিপস */
.category-filter-container {
  padding: 0 1.25rem 0.6rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.category-filter-container::-webkit-scrollbar {
  display: none;
}

.filter-chips {
  display: flex;
  gap: 0.45rem;
  padding-bottom: 0.25rem;
}

.chip {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  font-family: var(--font-main);
  font-size: 0.8rem;
  padding: 0.3rem 0.8rem;
  border-radius: 9999px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
}

.chip:hover {
  background-color: var(--bg-hover);
  color: var(--accent-color);
  border-color: var(--accent-color);
  transform: translateY(-1px);
}

.chip.active {
  background: var(--cloud-gradient);
  color: #ffffff;
  border-color: transparent;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

/* নোট তালিকা */
.notes-list-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0.5rem 1.25rem;
}

.notes-section-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.text-link-btn {
  background: none;
  border: none;
  font-family: var(--font-main);
  font-size: 0.775rem;
  color: var(--accent-color);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  transition: background-color 0.15s;
}

.text-link-btn:hover {
  background-color: var(--accent-light);
  text-decoration: none;
}

.notes-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-right: 0.25rem;
}

.notes-list::-webkit-scrollbar {
  width: 5px;
}

.notes-list::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: 10px;
}

.note-item {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-secondary);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.note-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: transparent;
  transition: background-color 0.2s;
}

.note-item:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.note-item.active {
  background: var(--cloud-gradient-subtle);
  border-color: var(--accent-color);
  box-shadow: 0 4px 16px rgba(14, 165, 233, 0.15);
}

.note-item.active::before {
  background: var(--cloud-gradient);
}

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

.note-item-title {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

.note-item.active .note-item-title {
  color: var(--accent-color);
  font-weight: 700;
}

.note-item-snippet {
  font-size: 0.835rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.4;
}

.note-item-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.note-item-tag {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.72rem;
  border: 1px solid var(--border-subtle);
}

.empty-notes-message {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* সাইডবার ফুটার */
.sidebar-footer {
  padding: 0.9rem 1.25rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-secondary);
}

.theme-switch-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  min-width: 44px;
  min-height: 44px;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all 0.2s ease;
}

.icon-btn:hover {
  background-color: var(--bg-hover);
  color: var(--accent-color);
}

.footer-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  background-color: var(--bg-tertiary);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

/* ==========================================================================
   মূল কনটেন্ট এরিয়া
   ========================================================================== */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-primary);
}

/* টপবার */
.topbar {
  height: var(--header-height);
  background-color: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  gap: 1rem;
  z-index: 10;
  box-shadow: var(--shadow-sm);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex: 1;
  min-width: 0;
}

.mobile-menu-btn {
  display: none;
}

.current-note-meta {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1;
  min-width: 0;
}

.note-title-input {
  font-family: var(--font-main);
  font-size: 1.35rem;
  font-weight: 700;
  border: 1px solid transparent;
  outline: none;
  background: transparent;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 0.15rem 0.4rem;
  width: 100%;
  max-width: 520px;
  transition: all 0.2s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.note-title-input:hover {
  background-color: var(--bg-hover);
}

.note-title-input:focus {
  background-color: var(--bg-secondary);
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(14, 165, 233, 0.2);
}

.note-meta-badges {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.775rem;
  flex-wrap: wrap;
}

.meta-badge {
  padding: 0.15rem 0.6rem;
  border-radius: 9999px;
  font-weight: 500;
}

.category-badge {
  background: var(--cloud-gradient-subtle);
  color: var(--accent-color);
  border: 1px solid rgba(14, 165, 233, 0.2);
}

.date-badge {
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

.save-indicator {
  color: var(--success-color);
  font-weight: 600;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}

.view-mode-toggle {
  display: flex;
  background-color: var(--bg-tertiary);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  gap: 0.2rem;
}

.toggle-btn {
  font-family: var(--font-main);
  font-size: 0.85rem;
  background: none;
  border: none;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.toggle-btn.active {
  background-color: var(--bg-secondary);
  color: var(--accent-color);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ==========================================================================
   প্যানেলসমূহ (এডিটর ও প্রিভিউ)
   ========================================================================== */
.panels-container {
  flex: 1;
  display: grid;
  height: calc(100vh - var(--header-height));
  overflow: hidden;
  background-color: var(--bg-primary);
  gap: 1px;
}

.panels-container.mode-split {
  grid-template-columns: 1fr 1fr;
}

.panels-container.mode-edit {
  grid-template-columns: 1fr;
}

.panels-container.mode-edit .preview-panel {
  display: none;
}

.panels-container.mode-preview {
  grid-template-columns: 1fr;
}

.panels-container.mode-preview .editor-panel {
  display: none;
}

.panel {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-secondary);
}

.editor-panel {
  border-right: 1px solid var(--border-color);
}

.panel-header {
  padding: 0.65rem 1.25rem;
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.panel-header::-webkit-scrollbar {
  display: none;
}

.panel-title {
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  white-space: nowrap;
}

.editor-quick-tools {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.editor-quick-tools::-webkit-scrollbar {
  display: none;
}

.tool-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
  font-family: var(--font-main);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
  min-height: 34px;
}

.tool-btn:hover {
  background-color: var(--bg-hover);
  color: var(--accent-color);
  border-color: var(--border-focus);
}

.preview-badge {
  font-size: 0.775rem;
  color: var(--accent-color);
  font-weight: 600;
  background-color: var(--accent-light);
  padding: 0.2rem 0.5rem;
  border-radius: 9999px;
  white-space: nowrap;
}

.panel-body {
  flex: 1;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
}

.markdown-textarea {
  flex: 1;
  width: 100%;
  height: 100%;
  padding: 1.5rem;
  border: none;
  outline: none;
  resize: none;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font-mono), var(--font-main);
  font-size: 1rem;
  line-height: 1.75;
}

.panel-footer.editor-stats {
  padding: 0.5rem 1.25rem;
  background-color: var(--bg-tertiary);
  border-top: 1px solid var(--border-color);
  font-size: 0.785rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  white-space: nowrap;
  overflow-x: auto;
}

/* ==========================================================================
   মার্কডাউন রেন্ডার স্টাইলিং (Adorsho Lipi Typography)
   ========================================================================== */
.preview-scrollable {
  overflow-y: auto;
  padding: 2.25rem 3rem;
  background: var(--bg-secondary);
}

.preview-scrollable::-webkit-scrollbar {
  width: 6px;
}

.preview-scrollable::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: 10px;
}

.markdown-render {
  max-width: 820px;
  margin: 0 auto;
  color: var(--text-primary);
  font-size: 1.1rem;
  line-height: 1.85;
  word-wrap: break-word;
}

.markdown-render h1,
.markdown-render h2,
.markdown-render h3,
.markdown-render h4 {
  font-family: var(--font-main);
  color: var(--text-primary);
  line-height: 1.35;
  margin-top: 1.6em;
  margin-bottom: 0.7em;
  font-weight: 700;
}

.markdown-render h1:first-child {
  margin-top: 0;
}

.markdown-render h1 {
  font-size: 2.1rem;
  background: var(--cloud-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.markdown-render h2 {
  font-size: 1.65rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.35rem;
}

.markdown-render h3 {
  font-size: 1.35rem;
}

.markdown-render p {
  margin-bottom: 1.25em;
}

.markdown-render ul,
.markdown-render ol {
  margin-bottom: 1.3em;
  padding-left: 2em;
}

.markdown-render li {
  margin-bottom: 0.45em;
}

.markdown-render blockquote {
  border-left: 4px solid var(--accent-color);
  background: var(--cloud-gradient-subtle);
  padding: 1rem 1.4rem;
  margin: 1.4em 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-secondary);
  font-style: italic;
  box-shadow: var(--shadow-sm);
}

.markdown-render pre {
  background-color: #0b1329;
  color: #f8fafc;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 1.4em 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.markdown-render code {
  font-family: var(--font-mono);
  background-color: var(--bg-hover);
  color: var(--accent-color);
  padding: 0.18rem 0.45rem;
  border-radius: 6px;
  font-size: 0.9em;
}

.markdown-render pre code {
  background-color: transparent;
  color: inherit;
  padding: 0;
}

.markdown-render table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.6em 0;
  font-size: 0.975rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.markdown-render th,
.markdown-render td {
  padding: 0.75rem 1.15rem;
  border-bottom: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  text-align: left;
}

.markdown-render th:last-child,
.markdown-render td:last-child {
  border-right: none;
}

.markdown-render tr:last-child td {
  border-bottom: none;
}

.markdown-render th {
  background-color: var(--bg-tertiary);
  font-weight: 700;
  color: var(--text-primary);
}

.markdown-render tr:nth-child(even) td {
  background-color: var(--bg-primary);
}

.markdown-render hr {
  border: 0;
  height: 2px;
  background: var(--cloud-gradient-subtle);
  margin: 2.2em 0;
}

.markdown-render .checklist-item {
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  margin-left: -1.4em;
  margin-bottom: 0.5em;
}

.markdown-render input[type="checkbox"] {
  accent-color: var(--accent-color);
  cursor: pointer;
  width: 16px;
  height: 16px;
}

.markdown-render a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px dashed var(--accent-color);
}

.markdown-render a:hover {
  border-bottom-style: solid;
}

/* ==========================================================================
   টোস্ট নোটিফিকেশন
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  z-index: 1000;
  pointer-events: none;
}

.toast {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.85rem 1.4rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  pointer-events: auto;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ==========================================================================
   সম্পূর্ণ মোবাইল-বান্ধব রেসপনসিভ ডিজাইন (Mobile Optimization)
   ========================================================================== */
@media (max-width: 992px) {
  .panels-container.mode-split {
    grid-template-columns: 1fr;
  }
  .panels-container.mode-split .preview-panel {
    display: none;
  }
  .view-mode-toggle #viewModeSplit {
    display: none;
  }
  .preview-scrollable {
    padding: 1.75rem 2rem;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: auto;
  }

  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: 82vw;
    max-width: 340px;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
    background-color: var(--bg-secondary);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.55);
    z-index: 99;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
  }

  .sidebar-backdrop.active {
    display: block;
  }

  .mobile-menu-btn {
    display: inline-flex;
    min-width: 44px;
    min-height: 44px;
  }

  .mobile-close-btn {
    display: inline-flex;
    min-width: 44px;
    min-height: 44px;
  }

  /* রেসপনসিভ টপবার */
  .topbar {
    padding: 0.75rem 1rem;
    flex-wrap: wrap;
    gap: 0.65rem;
    height: auto;
    min-height: 64px;
  }

  .topbar-left {
    width: 100%;
    order: 1;
  }

  .note-title-input {
    font-size: 1.15rem;
    max-width: 100%;
  }

  .topbar-right {
    width: 100%;
    order: 2;
    justify-content: space-between;
    padding-top: 0.4rem;
    border-top: 1px solid var(--border-subtle);
  }

  .panels-container {
    height: calc(100vh - 120px);
  }

  .preview-scrollable {
    padding: 1.25rem 1.25rem;
  }

  .markdown-textarea {
    padding: 1rem;
    font-size: 0.95rem;
  }

  .markdown-render {
    font-size: 1rem;
  }

  .markdown-render h1 {
    font-size: 1.6rem;
  }

  .markdown-render h2 {
    font-size: 1.35rem;
  }
}

@media (max-width: 480px) {
  .topbar-right {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  .view-mode-toggle {
    width: 100%;
    display: flex;
  }

  .view-mode-toggle .toggle-btn {
    flex: 1;
  }

  .topbar-actions {
    width: 100%;
    display: flex;
  }

  .topbar-actions .btn {
    flex: 1;
    min-height: 40px;
  }

  .panels-container {
    height: calc(100vh - 165px);
  }

  .toast-container {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
  }

  .toast {
    width: 100%;
    justify-content: center;
  }
}