:root {
  --bg: #f5f6fa;
  --card: #fff;
  --text: #111827;
  --muted: #6b7280;
  --accent: #f3f4f6;
  --accent-strong: #d1d5db;
  --brand: #3b82f6;
  --success: #10b981;
  --danger: #ef4444;
  --shadow: 0 4px 12px rgba(0,0,0,0.08);
  --gradient-start: #3b82f6;
  --gradient-end: #60a5fa;
  --cat-text: #111827;
  --cat-hover: #e5e7eb;
  --cat-border: #d1d5db;
  --cat-active-bg: var(--brand);
  --cat-active-color: #fff;
}

:root.dark {
  --bg: #121217;
  --card: #1f1f27;
  --text: #e5e7eb;
  --muted: #d1d3e0;
  --accent: #1a1a24;
  --accent-strong: #33334d;
  --brand: #60a5fa;
  --shadow: 0 4px 12px rgba(0,0,0,0.5);
  --gradient-start: #60a5fa;
  --gradient-end: #3b82f6;
  --cat-text: #e5e7eb;
  --cat-hover: #2c2f36;
  --cat-border: #4b5563;
  --cat-active-bg: var(--brand);
  --cat-active-color: #fff;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: 0.3s;
  height: 100%;
  direction: rtl;
}

.app {
  max-width: 1100px;
  margin: 32px auto;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 24px;
  padding: 0 16px;
}

.card {
  background: var(--card);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 16px;
  transition: 0.3s;
}

.sidebar {
  position: relative;
  top: 24px;
  height: fit-content;
  border: 1px solid var(--accent-strong);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 22px;
  margin-bottom: 16px;
}

.brand-dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--brand);
  animation: pulse 2s infinite;
}

.brand-name {
  letter-spacing: 0.5px;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.2); opacity: 0.7; }
}

.search input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--accent-strong);
  background: var(--accent);
  outline: none;
  color: var(--text);
  transition: 0.3s;
}

.search input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.2);
}

.cats h3 {
  margin: 1rem 0 12px;
  font-size: 14px;
  color: var(--muted);
  text-transform: uppercase;
}

.cat-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cat-item {
  display: flex;
  justify-content: space-between;
  padding: 12px 14px;
  border-radius: 12px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: 0.3s;
  background: var(--accent);
  color: var(--cat-text);
}

.cat-item:hover {
  background: var(--cat-hover);
  border-color: var(--cat-border);
}

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

.main {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: nowrap; /* جلوی رفتن به خط بعدی */
  gap: 16px;
}

.topbar h1 {
  margin: 0;
  font-size: 30px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.actions {
  display: flex;
  gap: 16px;
}

.btn {
  border: none;
  border-radius: 16px;
  padding: 12px 18px;
  cursor: pointer;
  font-weight: 600;
  display: flex;
  margin-top: 1rem;
  align-items: center;
  gap: 8px;
  background: linear-gradient(270deg, var(--gradient-start), var(--gradient-end));
  background-size: 400% 400%;
  color: #fff;
  animation: gradientBG 6s ease infinite;
  box-shadow: 0 6px 20px rgba(59,130,246,0.3);
  transition: 0.3s;
}

@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.btn:hover {
  transform: translateY(-2px) scale(1.02);
  opacity: 0.95;
  box-shadow: 0 8px 28px rgba(59,130,246,0.4);
}

.btn.soft {
  background: var(--accent);
  color: var(--text);
  border: 1px solid var(--accent-strong);
  margin-top: 1rem;
}

.btn.soft:hover {
  transform: translateY(-5px);
}

.btn.danger {
  background: var(--danger);
  color: #fff;
}

.icon-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 20px;
  color: var(--muted);
}

.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  border: none;
  margin-top: 1.1rem;
  font-size: 18px;
  padding: 10px 15px;
  cursor: pointer;
  font-weight: 600;
  color: #fff;
  transition: 0.4s ease;
  background: linear-gradient(135deg,#3b82f6,#60a5fa);
  box-shadow: 0 6px 18px rgba(59,130,246,0.35);
  flex-direction: row-reverse;
}

.toggle:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 10px 28px rgba(59,130,246,0.45);
}

.mode-label {
  color: #fff;
  font-weight: 500;
  text-transform: uppercase;
}

body.dark .toggle {
  background: linear-gradient(135deg,#facc15,#f97316);
}

body.dark .toggle .icon {
  transform: rotate(360deg);
  color: #fff;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

@media(max-width:860px){
  .app { grid-template-columns: 1fr; }
  .grid { grid-template-columns: 1fr; }
  .topbar h1 { font-size: 20px; }
  .btn.new-note { font-size: 14px; padding: 8px 12px; white-space: nowrap; }
}

.note {
  padding: 16px;
  border-radius: 20px;
  background: var(--card);
  border: 1px solid var(--accent-strong);
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 130px;
  transition: 0.3s;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.note::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  opacity: 0.05;
  z-index: 0;
  transition: 0.3s;
  border-radius: 20px;
}

.note:hover::before {
  opacity: 0.15;
  animation: gradientBG 6s ease infinite;
}

.note:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(0,0,0,0.15);
}

.note h3, .note p, .meta {
  position: relative;
  z-index: 1;
}

.note p {
  color: var(--muted);
  white-space: pre-wrap;
  overflow: auto;
}

.meta {
  display: flex;
  justify-content: space-between;
  margin-top: auto;
}

.badge {
  background: var(--accent);
  border: 1px solid var(--accent-strong);
  border-radius: 12px;
  padding: 5px 10px;
  font-size: 12px;
}

.time {
  font-size: 12px;
  color: var(--muted);
}

.dialog {
  border: none;
  border-radius: 20px;
  width: min(560px, 90vw);
  background: var(--card);
  color: var(--text);
  box-shadow: var(--shadow);
  transition: 0.3s;
  padding: 0;
}

.dialog::backdrop {
  background: rgba(0,0,0,0.35);
}

.dialog-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
  border-bottom: 1px solid var(--accent-strong);
  font-weight: 700;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 20px;
}

.field input,
.field textarea,
.field select {
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--accent-strong);
  background: var(--accent);
  color: var(--text);
  outline: none;
  transition: 0.3s;
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 2px rgba(59,130,246,0.2);
}

.dialog-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-top: 1px solid var(--accent-strong);
}

.spacer { flex: 1; }

.btn.new-note {
  font-family: 'Poppins', sans-serif;
  border-radius: 24px;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 8px 25px rgba(59,130,246,0.35);
  transition: 0.3s;
}

.btn.new-note:hover {
  transform: none;
  opacity: 0.95;
}