/* ====================================================
   قائمتي الذكية | One Stop To-Do
   ملف التنسيقات الرئيسي (Main Stylesheet)
   ==================================================== */

/* ----------------------------------------------------
   متغيرات التصميم والألوان والسمات (Theme Variables)
---------------------------------------------------- */
:root {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --card-bg: rgba(30, 41, 59, 0.75);
  --card-border: rgba(255, 255, 255, 0.08);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #06b6d4;
  --primary-gradient: linear-gradient(135deg, #06b6d4 0%, #0284c7 50%, #3b82f6 100%);
  --accent-glow: rgba(6, 182, 212, 0.25);

  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.12);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.12);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.12);

  --item-bg: rgba(15, 23, 42, 0.65);
  --item-border: rgba(255, 255, 255, 0.05);
  --item-hover: rgba(51, 65, 85, 0.45);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-card: 0 20px 45px -10px rgba(0, 0, 0, 0.5), 0 0 25px rgba(6, 182, 212, 0.08);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-primary: #f1f5f9;
  --bg-secondary: #e2e8f0;
  --card-bg: rgba(255, 255, 255, 0.88);
  --card-border: rgba(0, 0, 0, 0.08);
  --text-main: #0f172a;
  --text-muted: #64748b;
  --primary: #0284c7;
  --primary-gradient: linear-gradient(135deg, #0284c7 0%, #0ea5e9 100%);
  --accent-glow: rgba(2, 132, 199, 0.18);

  --item-bg: #f8fafc;
  --item-border: #e2e8f0;
  --item-hover: #edf2f7;
  --shadow-card: 0 20px 40px -15px rgba(0, 0, 0, 0.08), 0 0 15px rgba(2, 132, 199, 0.05);
}

/* ----------------------------------------------------
   إعادة الضبط والأساسيات (Reset & Base)
---------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Cairo', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-primary);
  background-image:
    radial-gradient(circle at 15% 15%, rgba(6, 182, 212, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(59, 130, 246, 0.12) 0%, transparent 40%);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 1rem;
  transition: background-color 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

/* إمكانية الوصول للتركيز */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ----------------------------------------------------
   الحاوية الرئيسية ذات التأثير الزجاجي (Glassmorphism)
---------------------------------------------------- */
.app-card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  width: 100%;
  max-width: 580px;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  animation: fadeIn 0.4s ease-out;
}

.app-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.99);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ----------------------------------------------------
   شريط العنوان العلوي وأدوات التحكم (Header)
---------------------------------------------------- */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.title-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px var(--accent-glow);
  color: #fff;
  flex-shrink: 0;
}

.logo-icon svg {
  width: 24px;
  height: 24px;
}

.header-text h1 {
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.header-text p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.header-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-icon {
  background: var(--item-bg);
  border: 1px solid var(--item-border);
  color: var(--text-muted);
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.btn-icon:hover {
  color: var(--text-main);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.btn-icon svg {
  width: 18px;
  height: 18px;
}

/* ----------------------------------------------------
   بطاقة التقدم والإحصائيات (Progress & Stats)
---------------------------------------------------- */
.stats-card {
  background: var(--item-bg);
  border: 1px solid var(--item-border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.stats-info {
  flex: 1;
}

.stats-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 0.35rem;
  display: flex;
  justify-content: space-between;
}

.progress-bar-container {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 100px;
  overflow: hidden;
}

[data-theme="light"] .progress-bar-container {
  background: rgba(0, 0, 0, 0.07);
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary-gradient);
  border-radius: 100px;
  width: 0%;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.stats-badge {
  font-size: 0.85rem;
  font-weight: 800;
  background: var(--accent-glow);
  color: var(--primary);
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  white-space: nowrap;
}

/* ----------------------------------------------------
   منطقة إضافة المهام والأولويات (Task Input Form)
---------------------------------------------------- */
.task-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.input-row {
  display: flex;
  gap: 0.5rem;
}

.input-wrapper {
  position: relative;
  flex: 1;
}

.task-input {
  width: 100%;
  background: var(--item-bg);
  border: 1px solid var(--item-border);
  color: var(--text-main);
  padding: 0.85rem 1rem 0.85rem 2.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  outline: none;
}

.task-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.task-input::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

.input-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  display: flex;
}

.input-icon svg {
  width: 18px;
  height: 18px;
}

.priority-select {
  background: var(--item-bg);
  border: 1px solid var(--item-border);
  color: var(--text-main);
  padding: 0 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  transition: var(--transition);
}

.priority-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.priority-select option {
  background: var(--bg-secondary);
  color: var(--text-main);
}

.btn-add {
  background: var(--primary-gradient);
  color: #ffffff;
  border: none;
  padding: 0.85rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition);
  box-shadow: 0 4px 12px var(--accent-glow);
  white-space: nowrap;
}

.btn-add:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px var(--accent-glow);
  filter: brightness(1.08);
}

.btn-add:active {
  transform: translateY(1px);
}

.btn-add svg {
  width: 18px;
  height: 18px;
}

/* ----------------------------------------------------
   شريط الفلاتر والبحث (Filters & Search)
---------------------------------------------------- */
.filter-search-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.search-box {
  position: relative;
}

.search-input {
  width: 100%;
  background: var(--item-bg);
  border: 1px solid var(--item-border);
  color: var(--text-main);
  padding: 0.65rem 1rem 0.65rem 2.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  outline: none;
  transition: var(--transition);
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

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

.search-icon svg {
  width: 16px;
  height: 16px;
}

.tabs {
  display: flex;
  gap: 0.35rem;
  background: var(--item-bg);
  padding: 0.25rem;
  border-radius: 10px;
  border: 1px solid var(--item-border);
}

.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.5rem 0.6rem;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 7px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
}

.tab-btn.active {
  background: var(--card-bg);
  color: var(--primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  font-weight: 800;
}

.tab-btn .badge {
  font-size: 0.72rem;
  background: rgba(255, 255, 255, 0.08);
  padding: 0.1rem 0.4rem;
  border-radius: 100px;
}

.tab-btn.active .badge {
  background: var(--accent-glow);
}

/* ----------------------------------------------------
   قائمة المهام (Task List & Items)
---------------------------------------------------- */
.task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  min-height: 80px;
  max-height: 400px;
  overflow-y: auto;
  padding-left: 2px;
  padding-right: 2px;
}

/* سكرول بار مخصص أنيق */
.task-list::-webkit-scrollbar {
  width: 5px;
}

.task-list::-webkit-scrollbar-track {
  background: transparent;
}

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

.task-item {
  background: var(--item-bg);
  border: 1px solid var(--item-border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  transition: var(--transition);
  animation: slideIn 0.25s ease-out;
  position: relative;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.task-item.deleting {
  opacity: 0;
  transform: translateX(20px) scale(0.95);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.task-item:hover {
  background: var(--item-hover);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateX(-2px);
}

.task-content {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  min-width: 0;
}

/* مربع الاختيار المخصص */
.checkbox-btn {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 2px solid var(--text-muted);
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: transparent;
  transition: var(--transition);
  flex-shrink: 0;
}

.checkbox-btn:hover {
  border-color: var(--primary);
  transform: scale(1.05);
}

.checkbox-btn svg {
  width: 14px;
  height: 14px;
  stroke-width: 3;
}

.task-item.completed .checkbox-btn {
  background: var(--success);
  border-color: var(--success);
  color: #ffffff;
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
}

.task-text-container {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}

.task-text {
  font-size: 0.95rem;
  color: var(--text-main);
  font-weight: 500;
  word-break: break-word;
  overflow-wrap: break-word;
  line-height: 1.4;
  transition: var(--transition);
}

.task-item.completed .task-text {
  text-decoration: line-through;
  color: var(--text-muted);
  opacity: 0.65;
}

.task-meta {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.priority-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: 5px;
}

.priority-high {
  background: var(--danger-bg);
  color: var(--danger);
}

.priority-medium {
  background: var(--warning-bg);
  color: var(--warning);
}

.priority-low {
  background: rgba(6, 182, 212, 0.12);
  color: var(--primary);
}

/* أزرار الإجراءات على المهمة */
.task-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.btn-action {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 30px;
  height: 30px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.btn-action:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
}

.btn-action.btn-delete:hover {
  background: var(--danger-bg);
  color: var(--danger);
}

.btn-action.btn-edit:hover {
  background: var(--accent-glow);
  color: var(--primary);
}

.btn-action svg {
  width: 16px;
  height: 16px;
}

/* ----------------------------------------------------
   حالة القائمة الفارغة (Empty State)
---------------------------------------------------- */
.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
}

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

.empty-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--item-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.25rem;
  border: 1px dashed var(--item-border);
}

.empty-icon svg {
  width: 28px;
  height: 28px;
  opacity: 0.6;
}

.empty-state h3 {
  font-size: 1.05rem;
  color: var(--text-main);
  font-weight: 700;
}

.empty-state p {
  font-size: 0.85rem;
  max-width: 260px;
  line-height: 1.4;
}

/* ----------------------------------------------------
   شريط الإجراءات السفلية والإحصائيات الجماعية
---------------------------------------------------- */
.batch-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--item-border);
}

.btn-text {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.82rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: var(--transition);
  font-weight: 600;
  padding: 0.3rem 0.5rem;
  border-radius: var(--radius-sm);
}

.btn-text:hover:not(:disabled) {
  color: var(--danger);
  background: var(--danger-bg);
}

.btn-text:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-text svg {
  width: 15px;
  height: 15px;
}

.active-count-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* ----------------------------------------------------
   التذييل الأنيق (Footer)
---------------------------------------------------- */
.footer {
  margin-top: 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
}

.footer-brand {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
  letter-spacing: 0.2px;
}

/* ----------------------------------------------------
   التنبيهات التفاعلية (Toasts)
---------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  pointer-events: none;
}

.toast {
  background: #1e293b;
  color: #f8fafc;
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.75rem 1.4rem;
  border-radius: 100px;
  font-size: 0.88rem;
  font-weight: 600;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  opacity: 0;
  transform: translateY(15px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast-warning {
  border-color: var(--warning);
  color: #fef3c7;
}

.toast-success {
  border-color: var(--success);
  color: #d1fae5;
}

/* ----------------------------------------------------
   نافذة التعديل المنبثقة (Edit Modal)
---------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  width: 100%;
  max-width: 440px;
  padding: 1.5rem;
  transform: scale(0.92);
  transition: var(--transition);
}

.modal-overlay.open .modal-card {
  transform: scale(1);
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.modal-select-wrapper {
  margin-top: 0.75rem;
}

.modal-priority-select {
  width: 100%;
  padding: 0.65rem 0.8rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.btn-modal-cancel {
  background: transparent;
  border: 1px solid var(--item-border);
  color: var(--text-muted);
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.btn-modal-cancel:hover {
  color: var(--text-main);
  background: var(--item-hover);
}

.btn-modal-save {
  background: var(--primary-gradient);
  color: #fff;
  border: none;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
}

.btn-modal-save:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

/* ----------------------------------------------------
   تأثير الاحتفال (Canvas Confetti)
---------------------------------------------------- */
#confettiCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9998;
}

/* ----------------------------------------------------
   التجاوب مع الشاشات الصغيرة (Responsive Design)
---------------------------------------------------- */
@media (max-width: 480px) {
  body {
    padding: 1rem 0.75rem;
  }

  .app-card {
    padding: 1.25rem;
  }

  .input-row {
    flex-direction: column;
  }

  .btn-add {
    justify-content: center;
  }

  .stats-card {
    padding: 0.85rem 1rem;
  }

  .tabs {
    overflow-x: auto;
  }
}