/* ==========================================================================
   Sky-Note - Modern, Ultra-Lightweight & Responsive Styling
   ========================================================================== */

:root {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1e293b;
  --bg-hover: #334155;
  --border-color: #1e293b;
  --border-subtle: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #38bdf8;
  --accent-hover: #0284c7;
  --accent-glow: rgba(56, 189, 248, 0.2);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --sidebar-width: 290px;
  --header-height: 58px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-hover: #e2e8f0;
  --border-color: #e2e8f0;
  --border-subtle: #cbd5e1;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #0284c7;
  --accent-hover: #0369a1;
  --accent-glow: rgba(2, 132, 199, 0.15);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 15px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* App Container */
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: relative;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  height: 100%;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), margin-left 0.25s ease;
  z-index: 40;
}

.sidebar-header {
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.3px;
  color: var(--text-primary);
  text-decoration: none;
}

.brand-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-icon svg {
  width: 100%;
  height: 100%;
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 600;
  background: var(--accent-glow);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sidebar-search-box {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 10px;
  color: var(--text-muted);
  pointer-events: none;
  font-size: 0.9rem;
}

.search-input {
  width: 100%;
  padding: 8px 12px 8px 32px;
  font-size: 0.88rem;
  background-color: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.search-input:focus {
  border-color: var(--accent);
  background-color: var(--bg-secondary);
}

.sidebar-actions {
  padding: 10px 14px;
  display: flex;
  gap: 8px;
}

.btn-new-note {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 14px;
  background: var(--accent);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

.btn-new-note:hover {
  background: var(--accent-hover);
}

.btn-new-note:active {
  transform: scale(0.98);
}

.btn-sidebar-icon {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  padding: 0 12px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 600;
  transition: all 0.15s ease;
  flex-shrink: 0;
}

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

.btn-sidebar-icon.active {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

/* Notes List */
.notes-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.notes-list::-webkit-scrollbar {
  width: 5px;
}
.notes-list::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: var(--radius-full);
}

.note-card {
  padding: 11px 13px;
  border-radius: var(--radius-md);
  background: transparent;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  position: relative;
  user-select: none;
}

.note-card:hover {
  background-color: var(--bg-tertiary);
}

.note-card.active {
  background-color: var(--bg-tertiary);
  border-color: var(--accent-glow);
  box-shadow: 0 0 0 1px var(--accent);
}

/* Drag and Drop styling */
.note-card.dragging {
  opacity: 0.4;
  transform: scale(0.98);
  border: 1px dashed var(--accent);
  background-color: var(--bg-tertiary);
}

.note-card.drag-over-top {
  border-top: 2px solid var(--accent) !important;
  border-top-left-radius: 2px;
  border-top-right-radius: 2px;
}

.note-card.drag-over-bottom {
  border-bottom: 2px solid var(--accent) !important;
  border-bottom-left-radius: 2px;
  border-bottom-right-radius: 2px;
}

.note-card-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 3px;
}

.note-card-title {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.note-card-preview {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 6px;
}

.note-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.note-card-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
}

.note-card:hover .note-card-actions {
  opacity: 1;
  pointer-events: auto;
}

.note-btn-action.btn-delete {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 5px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  user-select: none;
}

.note-btn-action.btn-delete:hover {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.15);
}

.reorder-mode .note-card-actions {
  opacity: 1 !important;
  pointer-events: auto !important;
}

.reorder-mode .note-btn-move {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 700;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.12s ease;
  user-select: none;
}

.reorder-mode .note-btn-move:hover:not(:disabled) {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

.reorder-mode .note-btn-move:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

/* Touchscreens without mouse hover: also allow delete on active note */
@media (hover: none) {
  .note-card.active .note-card-actions {
    opacity: 0.85;
    pointer-events: auto;
  }
}

@keyframes highlightMoved {
  0% { background-color: var(--accent-glow); transform: scale(1.02); }
  100% { background-color: transparent; transform: scale(1); }
}

.note-card.just-moved {
  animation: highlightMoved 0.6s ease;
}

/* Main Content Area */
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  background-color: var(--bg-primary);
  overflow: hidden;
  position: relative;
}

/* Header */
.main-header {
  height: var(--header-height);
  padding: 0 20px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-shrink: 0;
  z-index: 20;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.btn-sidebar-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-sidebar-toggle:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Status indicator badge */
.sync-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.76rem;
  font-weight: 500;
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  white-space: nowrap;
  user-select: none;
}

.sync-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success);
  flex-shrink: 0;
  transition: background-color 0.2s ease;
}

.sync-dot.saving {
  background-color: var(--warning);
  animation: pulse 1s infinite;
}

.sync-dot.offline {
  background-color: var(--text-muted);
}

.sync-dot.error {
  background-color: var(--danger);
}

.sync-dot.peer-active {
  background-color: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.7; }
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  height: 36px;
  padding: 0 12px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.15s ease;
}

.btn-icon:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-phone-connect {
  background: var(--accent-glow);
  color: var(--accent);
  border-color: rgba(56, 189, 248, 0.4);
  font-weight: 600;
}

.btn-phone-connect:hover {
  background: var(--accent);
  color: #ffffff;
}

/* Editor Toolbar */
.editor-toolbar {
  padding: 8px 24px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  flex-shrink: 0;
}

.editor-toolbar::-webkit-scrollbar {
  height: 0px;
}

.tool-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.95rem;
  transition: background 0.15s ease, color 0.15s ease;
}

.tool-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.tool-divider {
  width: 1px;
  height: 18px;
  background: var(--border-color);
  margin: 0 4px;
}

/* Editor Container */
.editor-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 32px 48px;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
}

.note-title-input {
  font-size: 1.85rem;
  font-weight: 700;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  margin-bottom: 16px;
  width: 100%;
  letter-spacing: -0.5px;
  font-family: inherit;
}

.note-title-input::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

.note-body-textarea {
  flex: 1;
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1.05rem;
  line-height: 1.75;
  resize: none;
  min-height: 350px;
}

.note-body-textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

/* Bottom status bar */
.editor-footer {
  padding: 8px 24px;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.footer-stats {
  display: flex;
  gap: 16px;
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 16px;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.modal-overlay.active {
  display: flex !important;
  opacity: 1 !important;
  visibility: visible !important;
  pointer-events: auto !important;
}

.modal-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalEnter 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalEnter {
  from { transform: scale(0.95) translateY(8px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.25rem;
  line-height: 1;
  padding: 4px;
  border-radius: var(--radius-sm);
}

.modal-close:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.modal-body {
  padding: 20px;
  max-height: 75vh;
  overflow-y: auto;
}

/* QR Code Section */
.qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.qr-frame {
  background: #ffffff;
  padding: 14px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-frame svg {
  display: block;
}

.qr-url-box {
  width: 100%;
  display: flex;
  gap: 8px;
}

.qr-url-input {
  flex: 1;
  padding: 8px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: var(--font-mono);
  outline: none;
}

.direct-address-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  margin-bottom: 14px;
  text-align: center;
}

.direct-address-title {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-weight: 500;
}

.direct-address-code {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.5px;
  background: var(--bg-primary);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px dashed rgba(56, 189, 248, 0.4);
  display: inline-block;
  user-select: all;
  margin-bottom: 6px;
}

.direct-address-note {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.step-guide {
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.step-guide ol {
  padding-left: 20px;
  margin-top: 6px;
}

.step-guide li {
  margin-bottom: 4px;
}

.step-guide strong {
  color: var(--text-primary);
}

/* Settings Form */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

.form-input {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
}

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

.form-help {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(50px);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-lg);
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0;
  pointer-events: none;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease;
  z-index: 200;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: 82%;
    max-width: 320px;
    box-shadow: var(--shadow-lg);
    transform: translateX(-100%);
  }

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

  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
    z-index: 35;
    display: none;
  }

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

  .editor-wrapper {
    padding: 20px 16px;
  }

  .note-title-input {
    font-size: 1.5rem;
  }

  .note-body-textarea {
    font-size: 1rem;
  }

  .main-header {
    padding: 0 12px;
  }

  .hide-on-mobile {
    display: none !important;
  }
}