* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: system-ui, 'Inter', 'Segoe UI', sans-serif;
}

body {
  background: #eef2f5;
  padding: 2rem 1rem;
}

.app-container {
  max-width: 1200px;
  margin: 0 auto;
  background: white;
  border-radius: 2rem;
  box-shadow: 0 20px 35px -10px rgba(0,0,0,0.1);
  overflow: hidden;
}

header {
  background: #0f172a;
  color: white;
  padding: 1.8rem 2rem;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 600;
}

header p {
  opacity: 0.8;
  margin-top: 0.4rem;
}

.task-form {
  padding: 1.8rem 2rem;
  background: #f9fafb;
  border-bottom: 1px solid #e2e8f0;
}

.form-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.task-form input, .task-form select, .task-form button {
  padding: 0.7rem 1rem;
  border-radius: 1rem;
  border: 1px solid #cbd5e1;
  font-size: 0.9rem;
  background: white;
}

.task-form input:focus, .task-form select:focus {
  outline: none;
  border-color: #3b82f6;
  box-shadow: 0 0 0 2px rgba(59,130,246,0.2);
}

#taskTitle {
  flex: 2;
  min-width: 180px;
}

#taskProject {
  flex: 1;
  min-width: 140px;
}

#taskPriority, #taskDueDate, #taskStatus {
  flex: 1;
  min-width: 130px;
}

#addTaskBtn {
  background: #3b82f6;
  color: white;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: 0.2s;
  padding: 0.7rem 1.5rem;
  width: 100%;
}

#addTaskBtn:hover {
  background: #2563eb;
  transform: scale(0.98);
}

.filters {
  padding: 1rem 2rem;
  background: white;
  border-bottom: 1px solid #e2e8f0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.filter-btn {
  background: #f1f5f9;
  border: none;
  padding: 0.4rem 1rem;
  border-radius: 2rem;
  font-size: 0.85rem;
  cursor: pointer;
  transition: 0.1s;
}

.filter-btn.active {
  background: #3b82f6;
  color: white;
}

.clear-completed {
  margin-left: auto;
  background: #fee2e2;
  color: #b91c1c;
  border: none;
  padding: 0.4rem 1rem;
  border-radius: 2rem;
  font-size: 0.8rem;
  cursor: pointer;
}

.clear-completed:hover {
  background: #fecaca;
}

.tasks-container {
  padding: 1.5rem 2rem;
}

.task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.task-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 1.2rem;
  padding: 1rem 1.2rem;
  transition: 0.1s;
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}

.task-card:hover {
  background: #fefce8;
  border-color: #cbd5e1;
}

.task-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.task-title {
  font-weight: 700;
  font-size: 1.05rem;
  color: #0f172a;
  word-break: break-word;
  flex: 2;
}

.task-project {
  font-size: 0.75rem;
  background: #eef2ff;
  padding: 0.2rem 0.6rem;
  border-radius: 40px;
  color: #1e40af;
}

.task-details {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0.6rem 0 0.4rem;
  font-size: 0.8rem;
  align-items: center;
}

.priority {
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 40px;
}

.priority.alta { background: #fee2e2; color: #b91c1c; }
.priority.media { background: #fef9c3; color: #854d0e; }
.priority.baja { background: #dcfce7; color: #166534; }

.due-date {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  color: #475569;
}

.status {
  padding: 0.2rem 0.6rem;
  border-radius: 40px;
  background: #f1f5f9;
}

.status.pendiente { background: #f1f5f9; color: #334155; }
.status.progreso { background: #dbeafe; color: #1e40af; }
.status.completada { background: #dcfce7; color: #166534; }

.task-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.6rem;
  justify-content: flex-end;
}

.task-actions button {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0.2rem 0.5rem;
  border-radius: 30px;
  transition: 0.1s;
}

.edit-btn:hover { background: #e0e7ff; color: #2563eb; }
.delete-btn:hover { background: #fee2e2; color: #dc2626; }

.empty-message {
  text-align: center;
  padding: 2rem;
  color: #94a3b8;
  background: #f8fafc;
  border-radius: 1rem;
}

footer {
  background: #f1f5f9;
  text-align: center;
  padding: 1rem;
  font-size: 0.7rem;
  color: #475569;
  border-top: 1px solid #e2e8f0;
}

@media (max-width: 750px) {
  .form-row {
    flex-direction: column;
  }
  .filters {
    flex-direction: column;
    align-items: stretch;
  }
  .clear-completed {
    margin-left: 0;
  }
  .task-header {
    flex-direction: column;
    gap: 0.4rem;
  }
}