/* ============ Design tokens ============ */
:root {
  --bg-app: #1a1a1d;
  --bg-sidebar: #151517;
  --bg-elevated: #202024;
  --bg-hover: #26262b;
  --bg-active: #2d2a24;
  --border: #2c2c30;
  --border-soft: #232326;

  --text-primary: #e8e6e1;
  --text-secondary: #a8a5a0;
  --text-muted: #6b6a68;

  --accent: #d4a574;
  --accent-soft: rgba(212, 165, 116, 0.14);
  --accent-strong: #e0b688;

  --danger: #d47474;
  --success: #7fae7f;

  --font-ui: "Hind Siliguri", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --sidebar-w: 280px;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg-app);
  color: var(--text-primary);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  color: inherit;
}

input {
  font-family: inherit;
}

::selection {
  background: var(--accent-soft);
}

/* ============ Login screen ============ */
/* গুরুত্বপূর্ণ: [hidden] attribute-এর specificity কম, তাই .app/.modal-overlay/
   .login-screen-এর মতো display:flex রুলগুলো cascade-এ [hidden]-কে override
   করে ফেলতে পারে (একই specificity হলে পরের রুল জেতে)। তাই এখানে explicit
   override দেওয়া হলো যাতে hidden attribute বসালে উপাদানটা সত্যিই লুকায়। */
[hidden] {
  display: none !important;
}

.login-screen {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 20% 20%, rgba(212, 165, 116, 0.06), transparent 45%),
    var(--bg-app);
  padding: 20px;
}

.login-card {
  width: 100%;
  max-width: 320px;
  text-align: center;
}

.login-mark {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  border-radius: 14px;
  background: linear-gradient(155deg, var(--accent-strong), #b98a5c);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 20px;
  color: #1a1408;
}

.login-card h1 {
  font-size: 24px;
  margin: 0 0 6px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.login-sub {
  color: var(--text-secondary);
  font-size: 14px;
  margin: 0 0 28px;
}

#login-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#pin-input {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  color: var(--text-primary);
  font-size: 22px;
  text-align: center;
  letter-spacing: 0.3em;
  outline: none;
  transition: border-color 0.15s;
}

#pin-input:focus { border-color: var(--accent); }

#login-form button {
  background: var(--accent);
  color: #1a1408;
  border: none;
  border-radius: var(--radius-md);
  padding: 13px;
  font-size: 15px;
  font-weight: 600;
  transition: background 0.15s;
}

#login-form button:hover { background: var(--accent-strong); }

.login-error {
  color: var(--danger);
  font-size: 13px;
  margin-top: 16px;
}

/* ============ App shell ============ */
.app {
  height: 100vh;
  height: 100dvh;
  display: flex;
  overflow: hidden;
}

/* ============ Sidebar ============ */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 14px 10px;
}

.sidebar-title {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.sidebar-actions {
  display: flex;
  gap: 2px;
}

.icon-btn {
  background: none;
  border: none;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: background 0.12s, color 0.12s;
}

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

.icon-btn.danger:hover {
  background: rgba(212, 116, 116, 0.14);
  color: var(--danger);
}

.sync-status {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 4px 16px 12px;
  font-size: 12px;
  color: var(--text-muted);
}

.sync-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
}

.sync-dot.online { background: var(--success); }
.sync-dot.syncing { background: var(--accent); animation: pulse 1s infinite; }
.sync-dot.error { background: var(--danger); }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.file-tree {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px 16px;
}

.tree-empty {
  padding: 20px 12px;
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
}

.tree-node { user-select: none; }

.tree-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  position: relative;
}

.tree-row:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.tree-row.active {
  background: var(--bg-active);
  color: var(--accent-strong);
}

.tree-row .chevron {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: transform 0.12s;
}

.tree-row.open .chevron { transform: rotate(90deg); }

.tree-row .node-icon {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  opacity: 0.75;
}

.tree-row .node-label {
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-children {
  margin-left: 14px;
  border-left: 1px solid var(--border-soft);
  padding-left: 4px;
}

.tree-row-actions {
  margin-left: auto;
  display: none;
  gap: 2px;
  flex-shrink: 0;
}

.tree-row:hover .tree-row-actions { display: flex; }

.tree-row-actions button {
  background: none;
  border: none;
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tree-row-actions button:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.sidebar-footer {
  padding: 10px 12px;
  border-top: 1px solid var(--border-soft);
}

.sidebar-footer .icon-btn {
  width: auto;
  padding: 6px 10px;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

/* ============ Sidebar overlay (mobile) ============ */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 15;
}

.sidebar-overlay.show { display: block; }

/* ============ Main ============ */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  height: 100%;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  height: 52px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border-soft);
}

.mobile-only { display: none; }

.breadcrumb {
  flex: 1;
  font-size: 13px;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 2px;
}

.save-indicator {
  font-size: 12px;
  color: var(--text-muted);
  width: 70px;
  text-align: right;
  flex-shrink: 0;
}

.save-indicator.saving { color: var(--accent); }
.save-indicator.saved { color: var(--success); }
.save-indicator.error { color: var(--danger); }

/* ============ Editor area ============ */
.editor-area {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.empty-state {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20px;
}

.empty-mark {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 22px;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.empty-state h2 {
  font-size: 17px;
  margin: 0 0 6px;
  color: var(--text-primary);
}

.empty-state p {
  font-size: 14px;
  color: var(--text-muted);
  margin: 0;
  max-width: 280px;
}

.editor-wrap {
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.file-title {
  flex: 0 0 auto;
  max-width: 760px;
  width: 100%;
  margin: 28px auto 0;
  padding: 0 24px;
  font-size: 2.1em;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  word-break: break-word;
}

.cm-host {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  max-width: 760px;
  margin: 0 auto;
  padding: 8px 24px 40vh;
  width: 100%;
}

/* CodeMirror overrides — Notion-like live preview feel */
.cm-editor {
  height: 100%;
  font-size: 15.5px;
  background: transparent !important;
  font-family: var(--font-ui);
}

.cm-editor.cm-focused { outline: none !important; }

.cm-scroller {
  font-family: var(--font-ui) !important;
  line-height: 1.75;
}

.cm-content {
  padding: 24px 0 !important;
  caret-color: var(--accent);
}

.cm-line { padding: 0 2px; }

.cm-gutters { display: none !important; }

.cm-selectionBackground {
  background: var(--accent-soft) !important;
}

/* markdown live-preview token styling */
.cm-heading1 { font-size: 1.85em; font-weight: 700; color: var(--text-primary); }
.cm-heading2 { font-size: 1.5em; font-weight: 700; color: var(--text-primary); }
.cm-heading3 { font-size: 1.22em; font-weight: 600; color: var(--text-primary); }
.cm-strong { font-weight: 700; color: var(--text-primary); }
.cm-emphasis { font-style: italic; }
.cm-strikethrough { text-decoration: line-through; opacity: 0.6; }
.cm-link { color: var(--accent-strong); text-decoration: underline; }
.cm-url { color: var(--text-muted); }
.cm-monospace {
  font-family: var(--font-mono);
  background: var(--bg-elevated);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.9em;
}
.cm-quote { color: var(--text-secondary); border-left: 3px solid var(--border); padding-left: 10px; }
.cm-list { color: var(--accent-strong); }
.cm-meta { color: var(--text-muted); opacity: 0.55; }
.cm-monospace-block {
  font-family: var(--font-mono);
  background: var(--bg-elevated);
  font-size: 0.92em;
}

/* ============ Modal ============ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 20px;
}

.modal {
  width: 100%;
  max-width: 380px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.modal h3 {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 600;
}

.modal input {
  width: 100%;
  background: var(--bg-app);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
}

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

.modal-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin: 8px 0 0;
  min-height: 14px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 18px;
}

.btn-ghost, .btn-primary {
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: 13.5px;
  font-weight: 500;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover { color: var(--text-primary); }

.btn-primary {
  background: var(--accent);
  color: #1a1408;
  font-weight: 600;
}

.btn-primary:hover { background: var(--accent-strong); }

.btn-primary.danger {
  background: #d9534f;
  color: #fff;
}
.btn-primary.danger:hover { background: #c9433f; }

/* ============ Mobile ============ */
@media (max-width: 780px) {
  .mobile-only { display: flex; }

  .sidebar {
    position: fixed;
    z-index: 20;
    left: 0;
    top: 0;
    bottom: 0;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: 0 0 30px rgba(0,0,0,0.4);
  }

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

  .cm-host { padding: 4px 16px 40vh; }
}