/* ===========================
   RESET & BASE
   =========================== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #14b8a6;
  --primary-dark: #0d9488;
  --primary-glow: rgba(20, 184, 166, 0.25);
  --accent: #f97316;
  --success: #10b981;
  --error: #ef4444;

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --card-bg: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.09);
  --todo-bg: rgba(255, 255, 255, 0.03);
  --todo-border: rgba(255, 255, 255, 0.07);
  --todo-hover: rgba(255, 255, 255, 0.07);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --transition: all 0.2s ease;
}

html {
  font-size: 16px;
  direction: rtl;
}

body {
  font-family: 'Vazirmatn', system-ui, sans-serif;
  background: #080814;
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ===========================
   BACKGROUND BLOBS
   =========================== */
.blobs {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.22;
  animation: blobFloat 12s ease-in-out infinite;
}

.blob--1 {
  width: 420px;
  height: 420px;
  background: #7c3aed;
  top: -120px;
  right: -100px;
  animation-delay: 0s;
}

.blob--2 {
  width: 360px;
  height: 360px;
  background: #0891b2;
  bottom: -100px;
  left: -80px;
  animation-delay: -5s;
}

.blob--3 {
  width: 280px;
  height: 280px;
  background: #0d9488;
  top: calc(50% - 140px);
  left: calc(50% - 140px);
  opacity: 0.15;
  animation-delay: -9s;
}

@keyframes blobFloat {
  0%, 100% { transform: translateY(0) scale(1); }
  50%       { transform: translateY(-24px) scale(1.06); }
}

/* ===========================
   APP LAYOUT
   =========================== */
.app {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  padding: 2.5rem 1rem 4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ===========================
   HEADER
   =========================== */
.app-header {
  text-align: center;
  margin-bottom: 2rem;
}

.app-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 68px;
  height: 68px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  border-radius: var(--radius-xl);
  color: #fff;
  margin-bottom: 1rem;
  box-shadow: 0 8px 32px var(--primary-glow), 0 2px 8px rgba(0,0,0,0.3);
}

.app-title {
  font-size: 2.1rem;
  font-weight: 700;
  background: linear-gradient(135deg, #fff 20%, var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.3rem;
  letter-spacing: -0.5px;
}

.app-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 400;
}

/* ===========================
   MAIN CARD
   =========================== */
.card {
  width: 100%;
  max-width: 600px;
  background: var(--card-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow:
    0 8px 40px rgba(0, 0, 0, 0.35),
    0 0 60px var(--primary-glow);
}

/* ===========================
   ADD FORM
   =========================== */
.add-form {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.add-input {
  flex: 1;
  min-width: 0;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: var(--radius-md);
  padding: 0.8rem 1rem;
  font-family: 'Vazirmatn', system-ui, sans-serif;
  font-size: 0.95rem;
  color: var(--text-primary);
  outline: none;
  transition: var(--transition);
  direction: rtl;
  text-align: right;
}

.add-input::placeholder {
  color: var(--text-muted);
  font-weight: 300;
}

.add-input:focus {
  border-color: var(--primary);
  background: rgba(20, 184, 166, 0.07);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.add-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  border: none;
  border-radius: var(--radius-md);
  color: #fff;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 16px var(--primary-glow);
}

.add-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--primary-glow);
}

.add-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px var(--primary-glow);
}

/* ===========================
   STATS BAR
   =========================== */
.stats {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  padding: 0.9rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
}

.stat {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(255, 255, 255, 0.09);
}

.stat-num {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  transition: var(--transition);
}

.stat-num--done { color: var(--success); }
.stat-num--left { color: var(--accent); }

.stat-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: 0.3px;
}

/* ===========================
   FILTER TABS
   =========================== */
.filter-tabs {
  display: flex;
  gap: 0.3rem;
  padding: 0.3rem;
  margin-bottom: 1.25rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-md);
}

.filter-tab {
  flex: 1;
  padding: 0.6rem 0.5rem;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-family: 'Vazirmatn', system-ui, sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.filter-tab:hover:not(.active) {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
}

.filter-tab.active {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  box-shadow: 0 2px 10px var(--primary-glow);
}

/* ===========================
   TODO LIST
   =========================== */
.todo-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

/* ===========================
   TODO ITEM
   =========================== */
.todo-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  background: var(--todo-bg);
  border: 1px solid var(--todo-border);
  border-radius: var(--radius-md);
  transition: var(--transition);
  animation: itemIn 0.22s ease;
}

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

.todo-item:hover {
  background: var(--todo-hover);
  border-color: rgba(255, 255, 255, 0.12);
}

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

.todo-item.completed .todo-date {
  opacity: 0.45;
}

/* Check Button */
.todo-check {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}

.todo-check:hover {
  background: rgba(20, 184, 166, 0.12);
  color: var(--primary);
  transform: scale(1.1);
}

.todo-item.completed .todo-check {
  color: var(--success);
}

.todo-item.completed .todo-check:hover {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

/* Content */
.todo-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.todo-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.5;
  word-break: break-word;
  transition: color 0.2s ease, opacity 0.2s ease;
}

.todo-date {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 300;
}

/* Action Buttons */
.todo-actions {
  display: flex;
  gap: 0.2rem;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.todo-item:hover .todo-actions,
.todo-item:focus-within .todo-actions {
  opacity: 1;
}

.todo-edit,
.todo-delete {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
}

.todo-edit  { color: var(--text-secondary); }
.todo-delete { color: var(--text-secondary); }

.todo-edit:hover {
  background: rgba(20, 184, 166, 0.12);
  color: var(--primary);
}

.todo-delete:hover {
  background: rgba(239, 68, 68, 0.12);
  color: var(--error);
}

/* ===========================
   EMPTY STATE
   =========================== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
  text-align: center;
  animation: itemIn 0.3s ease;
}

.empty-state.hidden {
  display: none;
}

.empty-icon {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  opacity: 0.4;
}

.empty-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

.empty-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 300;
}

/* ===========================
   MODAL
   =========================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fadeIn 0.18s ease;
}

.modal-backdrop.hidden {
  display: none;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.modal {
  width: 100%;
  max-width: 460px;
  background: rgba(12, 12, 26, 0.96);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow:
    0 24px 64px rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(255,255,255,0.04);
  animation: modalIn 0.22s ease;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(-10px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.modal-close:hover {
  background: rgba(239, 68, 68, 0.15);
  color: var(--error);
}

/* Form */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.form-input {
  width: 100%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: var(--radius-md);
  padding: 0.8rem 1rem;
  font-family: 'Vazirmatn', system-ui, sans-serif;
  font-size: 0.95rem;
  color: var(--text-primary);
  outline: none;
  transition: var(--transition);
  direction: rtl;
  text-align: right;
}

.form-input:focus {
  border-color: var(--primary);
  background: rgba(20, 184, 166, 0.07);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
}

.btn {
  flex: 1;
  padding: 0.78rem 1rem;
  border: none;
  border-radius: var(--radius-md);
  font-family: 'Vazirmatn', system-ui, sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn--primary {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  box-shadow: 0 4px 16px var(--primary-glow);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--primary-glow);
}

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

.btn--secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

/* ===========================
   SCROLLBAR
   =========================== */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ===========================
   FOCUS VISIBLE (A11Y)
   =========================== */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 480px) {
  .app {
    padding: 1.75rem 0.75rem 3rem;
  }

  .card {
    padding: 1.25rem;
    border-radius: var(--radius-lg);
  }

  .app-title { font-size: 1.7rem; }

  .app-icon {
    width: 56px;
    height: 56px;
  }

  .stat-num { font-size: 1.35rem; }

  /* Always show actions on mobile (no hover) */
  .todo-actions { opacity: 1; }

  .modal { padding: 1.25rem; }

  .modal-actions { flex-direction: column; }
}

@media (max-width: 360px) {
  .filter-tab { font-size: 0.78rem; padding: 0.55rem 0.3rem; }
  .add-input  { font-size: 0.88rem; }
}

/* ===========================
   REDUCED MOTION
   =========================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}